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FFH scientific research papers database
FFH database search (1991-2024):
41.
Stojanović, Jevrem; Milojević-Rakić, Maja; Bajuk-Bogdanović, Danica; Ranđelović, Dragana; Sokić, Miroslav; Otašević, Biljana; Malenović, Anđelija; Ležaić, Aleksandra Janošević; Protić, Ana
In: vol. 10, no. 14, 2024.
@article{Stojanović2024,
title = {Chemometrically-aided general approach to novel adsorbents studies: Case study on the adsorption of pharmaceuticals by the carbonized Ailanthus altissima leaves},
author = {Jevrem Stojanović and Maja Milojević-Rakić and Danica Bajuk-Bogdanović and Dragana Ranđelović and Miroslav Sokić and Biljana Otašević and Anđelija Malenović and Aleksandra Janošević Ležaić and Ana Protić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199005411&doi=10.1016%2fj.heliyon.2024.e34841&partnerID=40&md5=6921303b78010ad4343e6a6953e5f31d},
doi = {10.1016/j.heliyon.2024.e34841},
year = {2024},
date = {2024-01-01},
volume = {10},
number = {14},
abstract = {A chemometrically based approach was applied to select the most efficient drug adsorbent among the biochars obtained from the novel feedstock, the leaves of the invasive plant (Ailanthus altissima). The representative target adsorbates (atenolol, paracetamol, ketorolac and tetracycline) were selected on the basis of their physicochemical properties to cover a wide chemical space, which is the usual analytical challenge. Their adsorption was investigated using design of experiments as a comprehensive approach to optimise the performance of the adsorption system, rationalise the procedure and overcome common drawbacks. Among the response surface designs, the central composite design was selected as it allows the identification of important experimental factors (solid-to-liquid ratio, pH, ionic strength) and their interactions, and allows the selection of optimal experimental conditions to maximise adsorption performance. The biochars were prepared by pyrolysis at 500 °C and 800 °C (BC-500 and BC-800) and the ZnCl2-activated biochars were prepared at 650 °C and 800 °C (AcBC-650 and AcBC-800). The FTIR spectra revealed that increasing the pyrolysis temperature without activator decreases the intensity of all bands, while activation preserves functional groups, as evidenced by the spectra of AcBC-650 and AcBC-800. High temperatures during activation promoted the development of an efficient surface area, with the maximum observed for AcBC-800 reaching 347 m2 g−1. AcBC-800 was found to be the most efficient adsorbent with removal efficiencies of 34.1, 51.3, 55.9 and 38.2 % for atenolol, paracetamol, ketorolac and tetracycline, respectively. The models describing the relationship between the removal efficiency of AcBC-800 and the experimental factors studied, showed satisfactory predictive ability (predicted R2 > 0.8) and no significant lack-of-fit was observed. The results obtained, including the mathematical models, the properties of the adsorbates and the adsorbents, clearly indicate that the adsorption mechanisms of activated biochars are mainly based on hydrophobic interactions, pore filling and hydrogen bonding. © 2024 The Authors},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A chemometrically based approach was applied to select the most efficient drug adsorbent among the biochars obtained from the novel feedstock, the leaves of the invasive plant (Ailanthus altissima). The representative target adsorbates (atenolol, paracetamol, ketorolac and tetracycline) were selected on the basis of their physicochemical properties to cover a wide chemical space, which is the usual analytical challenge. Their adsorption was investigated using design of experiments as a comprehensive approach to optimise the performance of the adsorption system, rationalise the procedure and overcome common drawbacks. Among the response surface designs, the central composite design was selected as it allows the identification of important experimental factors (solid-to-liquid ratio, pH, ionic strength) and their interactions, and allows the selection of optimal experimental conditions to maximise adsorption performance. The biochars were prepared by pyrolysis at 500 °C and 800 °C (BC-500 and BC-800) and the ZnCl2-activated biochars were prepared at 650 °C and 800 °C (AcBC-650 and AcBC-800). The FTIR spectra revealed that increasing the pyrolysis temperature without activator decreases the intensity of all bands, while activation preserves functional groups, as evidenced by the spectra of AcBC-650 and AcBC-800. High temperatures during activation promoted the development of an efficient surface area, with the maximum observed for AcBC-800 reaching 347 m2 g−1. AcBC-800 was found to be the most efficient adsorbent with removal efficiencies of 34.1, 51.3, 55.9 and 38.2 % for atenolol, paracetamol, ketorolac and tetracycline, respectively. The models describing the relationship between the removal efficiency of AcBC-800 and the experimental factors studied, showed satisfactory predictive ability (predicted R2 > 0.8) and no significant lack-of-fit was observed. The results obtained, including the mathematical models, the properties of the adsorbates and the adsorbents, clearly indicate that the adsorption mechanisms of activated biochars are mainly based on hydrophobic interactions, pore filling and hydrogen bonding. © 2024 The Authors
42.
Kasalović, Marijana P.; Dimić, Dušan; Jelača, Sanja; Maksimović-Ivanić, Danijela; Mijatović, Sanja; Zmejkovski, Bojana B.; Schreiner, Simon H. F.; Rüffer, Tobias; Pantelić, Nebojša Đ.; Kaluđerović, Goran N.
In: vol. 17, no. 3, 2024.
@article{Kasalović2024,
title = {Trimethyltin(IV) Bearing 3-(4-Methyl-2-oxoquinolin-1(2H)-yl)propanoate Causes Lipid Peroxidation-Mediated Autophagic Cell Death in Human Melanoma A375 Cells},
author = {Marijana P. Kasalović and Dušan Dimić and Sanja Jelača and Danijela Maksimović-Ivanić and Sanja Mijatović and Bojana B. Zmejkovski and Simon H. F. Schreiner and Tobias Rüffer and Nebojša Đ. Pantelić and Goran N. Kaluđerović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188933378&doi=10.3390%2fph17030372&partnerID=40&md5=b818b7c82252caec6f2d466f9ecdb065},
doi = {10.3390/ph17030372},
year = {2024},
date = {2024-01-01},
volume = {17},
number = {3},
abstract = {A novel trimethyltin(IV) complex (Me3SnL), derived from 3-(4-methyl-2-oxoquinolin-1(2H)-yl)propanoate ligand, has been synthesized and characterized by elemental microanalysis, UV/Vis spectrophotometry, FT-IR and multinuclear (1H, 13C and 119Sn) NMR spectroscopies. Furthermore, the structure of the ligand precursor HL was solved using SC-XRD (single-crystal X-ray diffraction). The prediction of UV/Vis and NMR spectra by quantum-chemical methods was performed and compared to experimental findings. The protein binding affinity of Me3SnL towards BSA was determined by spectrofluorometric titration and subsequent molecular docking simulations. Me3SnL has been evaluated for its in vitro anticancer activity against three human cell lines, MCF-7 (breast adenocarcinoma), A375 (melanoma) and HCT116 (colorectal carcinoma), and three mouse tumor cell lines, 4T1 (breast carcinoma), B16 (melanoma) and CT26 (colon carcinoma), using MTT and CV assays. The strong inhibition of A375 cell proliferation, ROS/RNS upregulation and robust lipid peroxidation lead to autophagic cell death upon treatment with Me3SnL. © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A novel trimethyltin(IV) complex (Me3SnL), derived from 3-(4-methyl-2-oxoquinolin-1(2H)-yl)propanoate ligand, has been synthesized and characterized by elemental microanalysis, UV/Vis spectrophotometry, FT-IR and multinuclear (1H, 13C and 119Sn) NMR spectroscopies. Furthermore, the structure of the ligand precursor HL was solved using SC-XRD (single-crystal X-ray diffraction). The prediction of UV/Vis and NMR spectra by quantum-chemical methods was performed and compared to experimental findings. The protein binding affinity of Me3SnL towards BSA was determined by spectrofluorometric titration and subsequent molecular docking simulations. Me3SnL has been evaluated for its in vitro anticancer activity against three human cell lines, MCF-7 (breast adenocarcinoma), A375 (melanoma) and HCT116 (colorectal carcinoma), and three mouse tumor cell lines, 4T1 (breast carcinoma), B16 (melanoma) and CT26 (colon carcinoma), using MTT and CV assays. The strong inhibition of A375 cell proliferation, ROS/RNS upregulation and robust lipid peroxidation lead to autophagic cell death upon treatment with Me3SnL. © 2024 by the authors.
43.
Alshammari, Odeh Abdullah Odeh; Maisara, Sawsan; Alshammari, Badriah; Alshammari, Maha Raghyan; Rakic, Violeta; Marković, Jasmina Dimitrić; Jevtovic, Violeta; Dimić, Dušan
In: vol. 29, no. 6, 2024.
@article{Alshammari2024,
title = {Theoretical Insights into Different Complexation Modes of Dioxovanadium(V) Compounds with Pyridoxal Semicarbazone/Thiosemicarbazone/S-Methyl-iso-thiosemicarbazone Ligands},
author = {Odeh Abdullah Odeh Alshammari and Sawsan Maisara and Badriah Alshammari and Maha Raghyan Alshammari and Violeta Rakic and Jasmina Dimitrić Marković and Violeta Jevtovic and Dušan Dimić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189172147&doi=10.3390%2fmolecules29061213&partnerID=40&md5=3755482d5aa4cdfdb77942d604a062f8},
doi = {10.3390/molecules29061213},
year = {2024},
date = {2024-01-01},
volume = {29},
number = {6},
abstract = {Vanadium complexes have gained considerable attention as biologically active compounds. In this contribution, three previously reported dioxovanadium(V) complexes with pyridoxal semicarbazone, thiosemicarbazone, and S-methyl-iso-thiosemicarbazone ligands are theoretically examined. The intermolecular stabilization interactions within crystallographic structures were investigated by Hirshfeld surface analysis. These experimental structures were optimized at the B3LYP-D3BJ/6-311++G(d,p)(H,C,N,O,S)/def2-TZVP(V) level of theory, and crystallographic and optimized bond lengths and angles were compared. High correlation coefficients and low mean absolute errors between these two data sets proved that the selected level of theory was appropriate for the description of the system. The changes in structures and stability were examined by adding explicit solvent molecules. The Quantum Theory of Atoms in Molecules (QTAIM) was employed to analyze the intramolecular interactions with special emphasis on the effect of substituents. A good correlation between electron density/Laplacian and interatomic distance was found. Through molecular docking simulations towards Bovine Serum Albumin (BSA), the binding affinity of complexes was further investigated. The spontaneity of binding in the active position of BSA was shown. Further experimental studies on this class of compounds are advised. © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vanadium complexes have gained considerable attention as biologically active compounds. In this contribution, three previously reported dioxovanadium(V) complexes with pyridoxal semicarbazone, thiosemicarbazone, and S-methyl-iso-thiosemicarbazone ligands are theoretically examined. The intermolecular stabilization interactions within crystallographic structures were investigated by Hirshfeld surface analysis. These experimental structures were optimized at the B3LYP-D3BJ/6-311++G(d,p)(H,C,N,O,S)/def2-TZVP(V) level of theory, and crystallographic and optimized bond lengths and angles were compared. High correlation coefficients and low mean absolute errors between these two data sets proved that the selected level of theory was appropriate for the description of the system. The changes in structures and stability were examined by adding explicit solvent molecules. The Quantum Theory of Atoms in Molecules (QTAIM) was employed to analyze the intramolecular interactions with special emphasis on the effect of substituents. A good correlation between electron density/Laplacian and interatomic distance was found. Through molecular docking simulations towards Bovine Serum Albumin (BSA), the binding affinity of complexes was further investigated. The spontaneity of binding in the active position of BSA was shown. Further experimental studies on this class of compounds are advised. © 2024 by the authors.
44.
Milikić, Jadranka; Nastasić, Ana; Rakočević, Lazar; Radinović, Kristina; Stojadinović, Stevan; Stanković, Dalibor; Šljukić, Biljana
FeM/rGO (M = Ni and Cu) as bifunctional oxygen electrode Journal Article
In: vol. 368, 2024.
@article{Milikić2024c,
title = {FeM/rGO (M = Ni and Cu) as bifunctional oxygen electrode},
author = {Jadranka Milikić and Ana Nastasić and Lazar Rakočević and Kristina Radinović and Stevan Stojadinović and Dalibor Stanković and Biljana Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189750538&doi=10.1016%2fj.fuel.2024.131654&partnerID=40&md5=357db3e6f5a5aea0d0e8d2cf8351f164},
doi = {10.1016/j.fuel.2024.131654},
year = {2024},
date = {2024-01-01},
volume = {368},
abstract = {Three different iron-based electrocatalysts deposited on reduced graphene oxide (Fe/rGO, FeNi/rGO, and FeCu/rGO) were synthesized and examined for oxygen reduction and evolution reactions (ORR and OER, respectively) in alkaline media. X-ray powder diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy were used for a thorough investigation of physico-chemical properties of FeM/rGO electrocatalysts. XPS analysis indicated the presence of transition metals in higher oxidation states. Onset potentials during OER were found to be 1.51, 1.64, and 1.71 V for FeNi/rGO, FeCu/rGO, and Fe/rGO, respectively. Moreover, FeNi/rGO showed the highest OER current density (∼40 mA cm−2 at 2 V), two times higher than the benchmark OER electrocatalyst, IrO2, and the lowest Tafel slope (88 mV dec-1), lower than IrO2. The somewhat better catalytic activity of Fe/rGO for ORR in alkaline media compared to FeNi/rGO and FeCu/rGO was noticed. Tafel slopes of 105, 112, and 113 mV dec-1 during ORR were found for Fe/rGO, FeCu/rGO, and FeNi/rGO, respectively. Almost constant ORR current densities during chronoamperometric measurements were noticed for Fe/rGO and FeCu/rGO indicating stable performance. © 2024 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Three different iron-based electrocatalysts deposited on reduced graphene oxide (Fe/rGO, FeNi/rGO, and FeCu/rGO) were synthesized and examined for oxygen reduction and evolution reactions (ORR and OER, respectively) in alkaline media. X-ray powder diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy were used for a thorough investigation of physico-chemical properties of FeM/rGO electrocatalysts. XPS analysis indicated the presence of transition metals in higher oxidation states. Onset potentials during OER were found to be 1.51, 1.64, and 1.71 V for FeNi/rGO, FeCu/rGO, and Fe/rGO, respectively. Moreover, FeNi/rGO showed the highest OER current density (∼40 mA cm−2 at 2 V), two times higher than the benchmark OER electrocatalyst, IrO2, and the lowest Tafel slope (88 mV dec-1), lower than IrO2. The somewhat better catalytic activity of Fe/rGO for ORR in alkaline media compared to FeNi/rGO and FeCu/rGO was noticed. Tafel slopes of 105, 112, and 113 mV dec-1 during ORR were found for Fe/rGO, FeCu/rGO, and FeNi/rGO, respectively. Almost constant ORR current densities during chronoamperometric measurements were noticed for Fe/rGO and FeCu/rGO indicating stable performance. © 2024 Elsevier Ltd
45.
Stamenković, Tijana; Zdolšek, Nikola; Vujković, Milica; Brković, Snežana; Perović, Ivana; Lojpur, Vesna
Boosting electrochemical energy storage properties of SrGd2O4 through Yb3+ and Tm3+ rare earth ion doping Journal Article
In: vol. 495, 2024.
@article{Stamenković2024,
title = {Boosting electrochemical energy storage properties of SrGd2O4 through Yb3+ and Tm3+ rare earth ion doping},
author = {Tijana Stamenković and Nikola Zdolšek and Milica Vujković and Snežana Brković and Ivana Perović and Vesna Lojpur},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85194309877&doi=10.1016%2fj.electacta.2024.144489&partnerID=40&md5=0c551409fb2a10edf6021e88783bc26a},
doi = {10.1016/j.electacta.2024.144489},
year = {2024},
date = {2024-01-01},
volume = {495},
abstract = {Electrochemical supercapacitors represent advanced energy storage devices that excel in the swift storage and delivery of electrical energy, effectively bridging the gap between conventional capacitors and batteries. The present work, aimed to investigate charge storage properties of SrGd2O4 and rare earth ions Yb3+ and Tm3+ doped in SrGd2O4. Both materials were prepared via simple sol-gel synthesis and characterized by XRD, XPS, and FE-SEM with EDS. Characterization confirmed the presence of Tm3+ and Yb3+ in the SrGd2O4 matrix with a uniform distribution of elements. The charge storage behavior of pure SrGd2O4 and SrGd2O4:Yb4Tm1 in various electrolytes was thoroughly explored. Large electrochemical potential windows were shown by both electrode materials in aqueous 6 M KOH (1.7 V), which is essential for supercapacitors to achieve high specific energy. Furthermore, SrGd2O4:Yb4Tm1 demonstrated a substantially more pronounced charge storage effect in 6 M KOH electrolyte, with almost double times higher specific capacitance values compared with an un-doped SrGd2O4 sample. The main impact on the electrochemical window had matrix SrGd2O4, while the main impact on specific capacitance had rear earth dopants (Yb3+ and Tm3+). Improved charge storage characteristics of SrGd2O4:Yb4Tm1 were also evident through a notable reduction in overall resistance observed in electrochemical impedance spectroscopy experiments. Concerning the two-electrode GCD measurements, the SrGd2O4:Yb4Tm1 electrode in 6 M KOH showed a specific capacitance of 143 F g−1, with the specific energy of 12.5 Wh kg−1 at 0.6 A g−1. These findings demonstrate the potential of rare earth ion doping in enhancing the energy storage properties of SrGd2O4, offering promising avenues for the development of high-performance supercapacitors. © 2024 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Electrochemical supercapacitors represent advanced energy storage devices that excel in the swift storage and delivery of electrical energy, effectively bridging the gap between conventional capacitors and batteries. The present work, aimed to investigate charge storage properties of SrGd2O4 and rare earth ions Yb3+ and Tm3+ doped in SrGd2O4. Both materials were prepared via simple sol-gel synthesis and characterized by XRD, XPS, and FE-SEM with EDS. Characterization confirmed the presence of Tm3+ and Yb3+ in the SrGd2O4 matrix with a uniform distribution of elements. The charge storage behavior of pure SrGd2O4 and SrGd2O4:Yb4Tm1 in various electrolytes was thoroughly explored. Large electrochemical potential windows were shown by both electrode materials in aqueous 6 M KOH (1.7 V), which is essential for supercapacitors to achieve high specific energy. Furthermore, SrGd2O4:Yb4Tm1 demonstrated a substantially more pronounced charge storage effect in 6 M KOH electrolyte, with almost double times higher specific capacitance values compared with an un-doped SrGd2O4 sample. The main impact on the electrochemical window had matrix SrGd2O4, while the main impact on specific capacitance had rear earth dopants (Yb3+ and Tm3+). Improved charge storage characteristics of SrGd2O4:Yb4Tm1 were also evident through a notable reduction in overall resistance observed in electrochemical impedance spectroscopy experiments. Concerning the two-electrode GCD measurements, the SrGd2O4:Yb4Tm1 electrode in 6 M KOH showed a specific capacitance of 143 F g−1, with the specific energy of 12.5 Wh kg−1 at 0.6 A g−1. These findings demonstrate the potential of rare earth ion doping in enhancing the energy storage properties of SrGd2O4, offering promising avenues for the development of high-performance supercapacitors. © 2024 Elsevier Ltd
46.
Gandara, Meriene; Mladenović, Dušan; de Jesus Oliveira Martins, Marta; Rakocevic, Lazar; de Assis, João Marcos Kruszynski; Šljukić, Biljana; Gonçalves, Emerson Sarmento
MAX Phase (Nb4AlC3) For Electrocatalysis Applications Journal Article
In: vol. 20, no. 29, 2024.
@article{Gandara2024b,
title = {MAX Phase (Nb4AlC3) For Electrocatalysis Applications},
author = {Meriene Gandara and Dušan Mladenović and Marta de Jesus Oliveira Martins and Lazar Rakocevic and João Marcos Kruszynski de Assis and Biljana Šljukić and Emerson Sarmento Gonçalves},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85187258693&doi=10.1002%2fsmll.202310576&partnerID=40&md5=a11dee3380c72bd31a8b969353db9ede},
doi = {10.1002/smll.202310576},
year = {2024},
date = {2024-01-01},
volume = {20},
number = {29},
abstract = {In search for novel materials to replace noble metal-based electrocatalysts in electrochemical energy conversion and storage devices, special attention is given to a distinct class of materials, MAX phase that combines advantages of ceramic and metallic properties. Herein, Nb4AlC3 MAX phase is prepared by a solid-state mixing reaction and characterized morphologically and structurally by transmission and scanning electron microscopy with energy-dispersive X-ray spectroscopy, nitrogen-sorption, X-ray diffraction analysis, X-ray photoelectron and Raman spectroscopy. Electrochemical performance of Nb4AlC3 in terms of capacitance as well as for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is evaluated in different electrolytes. The specific capacitance Cs of 66.4, 55.0, and 46.0 F g−1 at 5 mV s−1 is determined for acidic, neutral and alkaline medium, respectively. Continuous cycling reveals high capacitance retention in three electrolyte media; moreover, increase of capacitance is observed in acidic and neutral media. The electrochemical impedance spectroscopy showed a low charge transfer resistance of 64.76 Ω cm2 that resulted in better performance for HER in acidic medium (Tafel slope of 60 mV dec−1). In alkaline media, the charge storage value in the double layer is 360 mF cm−2 (0.7 V versus reversible hydrogen electrode) and the best ORR performance of the Nb4AlC3 is achieved in this medium (Tafel slope of 126 mV dec−1). © 2024 Wiley-VCH GmbH.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In search for novel materials to replace noble metal-based electrocatalysts in electrochemical energy conversion and storage devices, special attention is given to a distinct class of materials, MAX phase that combines advantages of ceramic and metallic properties. Herein, Nb4AlC3 MAX phase is prepared by a solid-state mixing reaction and characterized morphologically and structurally by transmission and scanning electron microscopy with energy-dispersive X-ray spectroscopy, nitrogen-sorption, X-ray diffraction analysis, X-ray photoelectron and Raman spectroscopy. Electrochemical performance of Nb4AlC3 in terms of capacitance as well as for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is evaluated in different electrolytes. The specific capacitance Cs of 66.4, 55.0, and 46.0 F g−1 at 5 mV s−1 is determined for acidic, neutral and alkaline medium, respectively. Continuous cycling reveals high capacitance retention in three electrolyte media; moreover, increase of capacitance is observed in acidic and neutral media. The electrochemical impedance spectroscopy showed a low charge transfer resistance of 64.76 Ω cm2 that resulted in better performance for HER in acidic medium (Tafel slope of 60 mV dec−1). In alkaline media, the charge storage value in the double layer is 360 mF cm−2 (0.7 V versus reversible hydrogen electrode) and the best ORR performance of the Nb4AlC3 is achieved in this medium (Tafel slope of 126 mV dec−1). © 2024 Wiley-VCH GmbH.
47.
Jovanović, Vojislav; Petrušić, Igor; Savić, Andrej; Ković, Vanja
Processing of visual hapaxes in picture naming task: An event-related potential study Journal Article
In: vol. 203, 2024.
@article{Jovanović2024,
title = {Processing of visual hapaxes in picture naming task: An event-related potential study},
author = {Vojislav Jovanović and Igor Petrušić and Andrej Savić and Vanja Ković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199719584&doi=10.1016%2fj.ijpsycho.2024.112394&partnerID=40&md5=1f6639a82b558c7790ec168ad78cd8e2},
doi = {10.1016/j.ijpsycho.2024.112394},
year = {2024},
date = {2024-01-01},
volume = {203},
abstract = {Object recognition and visual categorization are typically swift and seemingly effortless tasks that involve numerous underlying processes. In our investigation, we utilized a picture naming task to explore the processing of rarely encountered objects (visual hapaxes) in comparison to common objects. Our aim was to determine the stage at which these rare objects are classified as unnamable. Contrary to our expectations and in contrast to some prior research on event-related potentials (ERPs) with novel and atypical objects, no differences between conditions were observed in the late time windows corresponding to the P300 or N400 components. However, distinctive patterns between hapaxes and common objects surfaced in three early time windows, corresponding to the posterior N1 and P2 waves, as well as a widespread N2 wave. According to the ERP data, the differentiation between hapaxes and common objects occurs within the first 380 ms of the processing line, involving only limited and indirect top-down influence. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Object recognition and visual categorization are typically swift and seemingly effortless tasks that involve numerous underlying processes. In our investigation, we utilized a picture naming task to explore the processing of rarely encountered objects (visual hapaxes) in comparison to common objects. Our aim was to determine the stage at which these rare objects are classified as unnamable. Contrary to our expectations and in contrast to some prior research on event-related potentials (ERPs) with novel and atypical objects, no differences between conditions were observed in the late time windows corresponding to the P300 or N400 components. However, distinctive patterns between hapaxes and common objects surfaced in three early time windows, corresponding to the posterior N1 and P2 waves, as well as a widespread N2 wave. According to the ERP data, the differentiation between hapaxes and common objects occurs within the first 380 ms of the processing line, involving only limited and indirect top-down influence. © 2024 Elsevier B.V.
48.
Petrušić, Igor; Martelletti, Paolo
Comment on "What predicts citation counts and translational impact in headache research? A machine learning analysis" Journal Article
In: vol. 44, no. 8, pp. 3331024241266980, 2024.
@article{Petrušić20243331024241266980,
title = {Comment on "What predicts citation counts and translational impact in headache research? A machine learning analysis"},
author = {Igor Petrušić and Paolo Martelletti},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85200527563&doi=10.1177%2f03331024241266980&partnerID=40&md5=9ca138deccef15dff307eb5c095b6c7c},
doi = {10.1177/03331024241266980},
year = {2024},
date = {2024-01-01},
volume = {44},
number = {8},
pages = {3331024241266980},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
49.
Milanović, Žiko; Dimić, Dušan; Avdović, Edina H.; Simijonović, Dušica M.; Nakarada, Đura; Jakovljević, Vladimir; Vojinović, Radiša; Marković, Zoran S.
Mechanism of Antiradical Activity of Coumarin-Trihydroxybenzohydrazide Derivatives: A Comprehensive Kinetic DFT Study Journal Article
In: vol. 13, no. 2, 2024.
@article{Milanović2024,
title = {Mechanism of Antiradical Activity of Coumarin-Trihydroxybenzohydrazide Derivatives: A Comprehensive Kinetic DFT Study},
author = {Žiko Milanović and Dušan Dimić and Edina H. Avdović and Dušica M. Simijonović and Đura Nakarada and Vladimir Jakovljević and Radiša Vojinović and Zoran S. Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85187258968&doi=10.3390%2fantiox13020143&partnerID=40&md5=3dfd5910afa12c2c7fbc1ead97dd619e},
doi = {10.3390/antiox13020143},
year = {2024},
date = {2024-01-01},
volume = {13},
number = {2},
abstract = {As part of this study, the mechanisms of the antioxidant activity of previously synthesized coumarin–trihydrobenzohydrazine derivatives were investigated: (E)-2,4-dioxo-3-(1-(2-(2″,3″,4″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (1) and (E)-2,4-dioxo-3-(1-(2-(3″,4″,5″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (2). The capacity of the compounds to neutralize HO• was assessed by EPR spectroscopy. The standard mechanisms of antioxidant action, Hydrogen Atom Transfer (HAT), Sequential Proton Loss followed by Electron Transfer (SPLET), Single-Electron Transfer followed by Proton Transfer (SET-PT), and Radical Adduct/Coupling Formation (RAF/RCF) were examined using the QM-ORSA methodology. It was estimated that the newly synthesized compounds, under physiological conditions, exhibited antiradical activity via SPLET and RCF mechanisms. Based on the estimated overall rate constants (koverall), it can be concluded that 2 exhibited a greater antiradical capacity. The obtained values indicated a good correlation with the EPR spectroscopy results. Both compounds exhibit approximately 1.5 times more activity in comparison to the precursor compound used in the synthesis (gallic acid). © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
As part of this study, the mechanisms of the antioxidant activity of previously synthesized coumarin–trihydrobenzohydrazine derivatives were investigated: (E)-2,4-dioxo-3-(1-(2-(2″,3″,4″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (1) and (E)-2,4-dioxo-3-(1-(2-(3″,4″,5″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (2). The capacity of the compounds to neutralize HO• was assessed by EPR spectroscopy. The standard mechanisms of antioxidant action, Hydrogen Atom Transfer (HAT), Sequential Proton Loss followed by Electron Transfer (SPLET), Single-Electron Transfer followed by Proton Transfer (SET-PT), and Radical Adduct/Coupling Formation (RAF/RCF) were examined using the QM-ORSA methodology. It was estimated that the newly synthesized compounds, under physiological conditions, exhibited antiradical activity via SPLET and RCF mechanisms. Based on the estimated overall rate constants (koverall), it can be concluded that 2 exhibited a greater antiradical capacity. The obtained values indicated a good correlation with the EPR spectroscopy results. Both compounds exhibit approximately 1.5 times more activity in comparison to the precursor compound used in the synthesis (gallic acid). © 2024 by the authors.
50.
Gandara, Meriene; Arruda, Milena Nakagawa; Assis, João Marcos Kruszynski; de Jesus Oliveira Martins, Marta; Rakočević, Lazar; Mladenović, Dušan; Šljukić, Biljana; Gonçalves, Emerson Sarmento
Nb-MXene as promising material for electrocatalysis in energy conversion (OER/ORR) and storage Journal Article
In: vol. 40, 2024.
@article{Gandara2024,
title = {Nb-MXene as promising material for electrocatalysis in energy conversion (OER/ORR) and storage},
author = {Meriene Gandara and Milena Nakagawa Arruda and João Marcos Kruszynski Assis and Marta de Jesus Oliveira Martins and Lazar Rakočević and Dušan Mladenović and Biljana Šljukić and Emerson Sarmento Gonçalves},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199948753&doi=10.1016%2fj.apmt.2024.102356&partnerID=40&md5=c67523d7da5f5c8bcd7dc6b1a3b43293},
doi = {10.1016/j.apmt.2024.102356},
year = {2024},
date = {2024-01-01},
volume = {40},
abstract = {Low-cost non-noble metal electrocatalysts are currently the focus of research and development for energy conversion and storage devices. MXenes, the newest class of two-dimensional materials, have high surface area, nanometer layer thickness, hydrophilicity and high electrical conductivity that favor their performance for electrocatalytic reactions. Herein, niobium carbide MXene (Nb-MXene) was obtained from its MAX phase by chemical synthesis and characterized regarding its morphology, structure and electrochemical activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) as well as for charge storage in different electrolytic media. The results demonstrate the good performance of Nb-MXene for storing charge (104 F g−1 at 5 mV s−1) that increased remarkably with continuous cycling in an acidic medium. Current density for oxygen evolution of ∼32.5 mA cm−2 was reached in alkaline medium. The oxygen reduction reaction in the same media was observed to proceed via 2e− mechanism with a Tafel slope of 114 mV dec−1. Therefore, Nb-MXene presents characteristics and performance of a promising material for electrocatalytic reactions. © 2024},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Low-cost non-noble metal electrocatalysts are currently the focus of research and development for energy conversion and storage devices. MXenes, the newest class of two-dimensional materials, have high surface area, nanometer layer thickness, hydrophilicity and high electrical conductivity that favor their performance for electrocatalytic reactions. Herein, niobium carbide MXene (Nb-MXene) was obtained from its MAX phase by chemical synthesis and characterized regarding its morphology, structure and electrochemical activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) as well as for charge storage in different electrolytic media. The results demonstrate the good performance of Nb-MXene for storing charge (104 F g−1 at 5 mV s−1) that increased remarkably with continuous cycling in an acidic medium. Current density for oxygen evolution of ∼32.5 mA cm−2 was reached in alkaline medium. The oxygen reduction reaction in the same media was observed to proceed via 2e− mechanism with a Tafel slope of 114 mV dec−1. Therefore, Nb-MXene presents characteristics and performance of a promising material for electrocatalytic reactions. © 2024
51.
Vićentić, T.; Greco, I.; Iorio, C. S.; Mišković, V.; Bajuk-Bogdanović, D.; Pašti, I. A.; Radulović, K.; Klenk, S.; Stimpel-Lindner, T.; Duesberg, G. S.; Spasenović, M.
Laser-induced graphene on cross-linked sodium alginate Journal Article
In: vol. 35, no. 11, 2024.
@article{Vićentić2024,
title = {Laser-induced graphene on cross-linked sodium alginate},
author = {T. Vićentić and I. Greco and C. S. Iorio and V. Mišković and D. Bajuk-Bogdanović and I. A. Pašti and K. Radulović and S. Klenk and T. Stimpel-Lindner and G. S. Duesberg and M. Spasenović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85181395405&doi=10.1088%2f1361-6528%2fad143a&partnerID=40&md5=774936471acc9f82cf448c0faebe90d5},
doi = {10.1088/1361-6528/ad143a},
year = {2024},
date = {2024-01-01},
volume = {35},
number = {11},
abstract = {Laser-induced graphene (LIG) possesses desirable properties for numerous applications. However, LIG formation on biocompatible substrates is needed to further augment the integration of LIG-based technologies into nanobiotechnology. Here, LIG formation on crosslinked sodium alginate is reported. The LIG is systematically investigated, providing a comprehensive understanding of the physicochemical characteristics of the material. Raman spectroscopy, scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy techniques confirm the successful generation of oxidized graphene on the surface of cross-linked sodium alginate. The influence of laser parameters and the amount of crosslinker incorporated into the alginate substrate is explored, revealing that lower laser speed, higher resolution, and increased CaCl2 content leads to LIG with lower electrical resistance. These findings could have significant implications for the fabrication of LIG on alginate with tailored conductive properties, but they could also play a guiding role for LIG formation on other biocompatible substrates. © 2024 Institute of Physics Publishing. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Laser-induced graphene (LIG) possesses desirable properties for numerous applications. However, LIG formation on biocompatible substrates is needed to further augment the integration of LIG-based technologies into nanobiotechnology. Here, LIG formation on crosslinked sodium alginate is reported. The LIG is systematically investigated, providing a comprehensive understanding of the physicochemical characteristics of the material. Raman spectroscopy, scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy techniques confirm the successful generation of oxidized graphene on the surface of cross-linked sodium alginate. The influence of laser parameters and the amount of crosslinker incorporated into the alginate substrate is explored, revealing that lower laser speed, higher resolution, and increased CaCl2 content leads to LIG with lower electrical resistance. These findings could have significant implications for the fabrication of LIG on alginate with tailored conductive properties, but they could also play a guiding role for LIG formation on other biocompatible substrates. © 2024 Institute of Physics Publishing. All rights reserved.
52.
Vujković, Milica; Popović, Maja; Čebela, Maria; Jugović, Dragana
Heavily vanadium-doped LiFePO4 olivine as electrode material for Li-ion aqueous rechargeable batteries Journal Article
In: vol. 11, no. 5, 2024.
@article{Vujković2024,
title = {Heavily vanadium-doped LiFePO4 olivine as electrode material for Li-ion aqueous rechargeable batteries},
author = {Milica Vujković and Maja Popović and Maria Čebela and Dragana Jugović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85192959763&doi=10.1088%2f2053-1591%2fad3463&partnerID=40&md5=a91598a29d1c4a84ffae8d8a4413dfc0},
doi = {10.1088/2053-1591/ad3463},
year = {2024},
date = {2024-01-01},
volume = {11},
number = {5},
abstract = {Since LiFePO4 batteries play a major role in the transition to safe, more affordable and sustainable energy production, numerous strategies have been applied to modify LFP cathode, with the aim of improving its electrochemistry. In this contribution, a highly vanadium-doped LiFe0.9V0.1PO4/C composite (LFP/C-10V) is synthesized using the glycine combustion method and characterized by x-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetry Differential Thermal Analysis (TGDTA) and Cyclic Voltammetry (CV). It is shown that 10wt.% of vanadium can substitute Fe positions, thus decreasing unit cell volume, which is followed by generation of Li3V2PO4 traces, as detected by CV. High vanadium doping does not change the carbon content in the composite (≈13 wt%) but improves its electronic conductivity and electrochemical performance in both aqueous and organic electrolytes. The reversibility and current response are increasing following the trend: LFP/C, LFP/C -3mol%V, LFP/C - 5 mol % and LFP/C-10 mol %. The best specific capacity is obtained for the most highly doped olivine, which exhibits a reversible process at 1 mV s−1 in an aqueous electrolyte, thus showing a peak-to-peak distance of 56 mV. The high capacity of LFPC-10V is measured in both LiNO3 and NaNO3 electrolytes amounting to around 100 mAh g−1 at 20 mV s−1. Still, the material is only stable in LiNO3 electrolyte, making it more suitable for Li than Na-ion aqueous rechargeable batteries. © 2024 The Author(s). Published by IOP Publishing Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Since LiFePO4 batteries play a major role in the transition to safe, more affordable and sustainable energy production, numerous strategies have been applied to modify LFP cathode, with the aim of improving its electrochemistry. In this contribution, a highly vanadium-doped LiFe0.9V0.1PO4/C composite (LFP/C-10V) is synthesized using the glycine combustion method and characterized by x-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetry Differential Thermal Analysis (TGDTA) and Cyclic Voltammetry (CV). It is shown that 10wt.% of vanadium can substitute Fe positions, thus decreasing unit cell volume, which is followed by generation of Li3V2PO4 traces, as detected by CV. High vanadium doping does not change the carbon content in the composite (≈13 wt%) but improves its electronic conductivity and electrochemical performance in both aqueous and organic electrolytes. The reversibility and current response are increasing following the trend: LFP/C, LFP/C -3mol%V, LFP/C - 5 mol % and LFP/C-10 mol %. The best specific capacity is obtained for the most highly doped olivine, which exhibits a reversible process at 1 mV s−1 in an aqueous electrolyte, thus showing a peak-to-peak distance of 56 mV. The high capacity of LFPC-10V is measured in both LiNO3 and NaNO3 electrolytes amounting to around 100 mAh g−1 at 20 mV s−1. Still, the material is only stable in LiNO3 electrolyte, making it more suitable for Li than Na-ion aqueous rechargeable batteries. © 2024 The Author(s). Published by IOP Publishing Ltd.
53.
Kordić, Branko; Dimić, Dušan; Despotović, Vesna; Jović, Branislav
In: vol. 399, 2024.
@article{Kordić2024,
title = {Spectroscopic and theoretical investigation of solvent effect on N–H∙∙∙O, N–H∙∙∙N and N–H∙∙∙π interactions in complexes of N-monosubstituted benzamides},
author = {Branko Kordić and Dušan Dimić and Vesna Despotović and Branislav Jović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188738887&doi=10.1016%2fj.molliq.2024.124472&partnerID=40&md5=d29fd6321169dd76301e5d58758a1ce1},
doi = {10.1016/j.molliq.2024.124472},
year = {2024},
date = {2024-01-01},
volume = {399},
abstract = {In this research, experimental and theoretical spectral analysis of N-monosubstituted benzamides was performed by mid-infrared spectroscopy and density functional theory. The MIR spectroscopic characteristics for N–H∙∙∙O, N–H∙∙∙N and N–H∙∙∙π hydrogen-bonded complexes and also the equilibrium constants for 1:1 complex formation are given. The structures of selected N-substituted benzamides (as proton donors), benzene, acetonitrile, and tetrahydrofuran (as proton acceptors), as well as their complexes, were optimised at the M06-2X/6–311++G(d,p) level of theory. The solvent effect on hydrogen-bonded complexes and the correlations between the equilibrium constants and molecular descriptors of N-monosubstituted benzamides were also investigated using a principal component analysis. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this research, experimental and theoretical spectral analysis of N-monosubstituted benzamides was performed by mid-infrared spectroscopy and density functional theory. The MIR spectroscopic characteristics for N–H∙∙∙O, N–H∙∙∙N and N–H∙∙∙π hydrogen-bonded complexes and also the equilibrium constants for 1:1 complex formation are given. The structures of selected N-substituted benzamides (as proton donors), benzene, acetonitrile, and tetrahydrofuran (as proton acceptors), as well as their complexes, were optimised at the M06-2X/6–311++G(d,p) level of theory. The solvent effect on hydrogen-bonded complexes and the correlations between the equilibrium constants and molecular descriptors of N-monosubstituted benzamides were also investigated using a principal component analysis. © 2024 Elsevier B.V.
54.
Polić, Suzana; Ristić, Slavica; Radojković, Bojana; Bajuk-Bogdanović, Danica
Corroded medieval iron nail from the Studenica Monastery - Material analysis and laser cleaning Journal Article
In: vol. 66, pp. 367 – 374, 2024.
@article{Polić2024367,
title = {Corroded medieval iron nail from the Studenica Monastery - Material analysis and laser cleaning},
author = {Suzana Polić and Slavica Ristić and Bojana Radojković and Danica Bajuk-Bogdanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85182143489&doi=10.1016%2fj.culher.2023.12.012&partnerID=40&md5=70ec1afed04420ce85010a6521936fbc},
doi = {10.1016/j.culher.2023.12.012},
year = {2024},
date = {2024-01-01},
volume = {66},
pages = {367 – 374},
abstract = {In this paper, the state of an archaeological artefact (iron nail) originating from the Studenica Monastery (Serbia) has been presented as well as the possibility of laser cleaning its corrosion layers. To determine the presence of cracks and other defects in the sample, the digital radiographic method was used. The composition of the artefact was analysed by X-ray Fluorescence Spectrometry (XRF) and energy-dispersive X-ray Spectroscopy (EDX). The corrosion products were investigated by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman Spectroscopy, and EDX microanalysis. The Nd:YAG laser was used for corrosion cleaning. The morphological modification of the surfaces cleaned by laser was analysed with optical and scanning electron microscopy (SEM). The test results showed that the cleaning of thick corrosion deposits with a laser is difficult and very expensive. Therefore, it is necessary to combine mechanical or chemical methods with lasers. © 2023 Consiglio Nazionale delle Ricerche (CNR)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, the state of an archaeological artefact (iron nail) originating from the Studenica Monastery (Serbia) has been presented as well as the possibility of laser cleaning its corrosion layers. To determine the presence of cracks and other defects in the sample, the digital radiographic method was used. The composition of the artefact was analysed by X-ray Fluorescence Spectrometry (XRF) and energy-dispersive X-ray Spectroscopy (EDX). The corrosion products were investigated by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman Spectroscopy, and EDX microanalysis. The Nd:YAG laser was used for corrosion cleaning. The morphological modification of the surfaces cleaned by laser was analysed with optical and scanning electron microscopy (SEM). The test results showed that the cleaning of thick corrosion deposits with a laser is difficult and very expensive. Therefore, it is necessary to combine mechanical or chemical methods with lasers. © 2023 Consiglio Nazionale delle Ricerche (CNR)
55.
Georgijević, Jelena; Milikić, Jadranka; Aykut, Yasemin; Zdolšek, Nikola; Santos, Diogo M. F.; Bayrakçeken, Ayşe; Šljukić, Biljana
Fe, Cu-decorated carbon material produced from ionic liquids as resourceful electrocatalyst for water splitting Journal Article
In: vol. 967, 2024.
@article{Georgijević2024,
title = {Fe, Cu-decorated carbon material produced from ionic liquids as resourceful electrocatalyst for water splitting},
author = {Jelena Georgijević and Jadranka Milikić and Yasemin Aykut and Nikola Zdolšek and Diogo M. F. Santos and Ayşe Bayrakçeken and Biljana Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85196621637&doi=10.1016%2fj.jelechem.2024.118455&partnerID=40&md5=5ea46bf6cba07b186c66053645399545},
doi = {10.1016/j.jelechem.2024.118455},
year = {2024},
date = {2024-01-01},
volume = {967},
abstract = {The quest for highly efficient, stable, and economically viable bifunctional electrocatalysts is of paramount relevance for advancing in water splitting for the hydrogen energy sector, particularly in facilitating hydrogen (HER) and oxygen evolution evolution (OER) as cathodic and anodic reaction, respectively. In this study, two ionic liquids containing transition metal Fe or Cu, as well as a mixture of these ionic liquids, were used as precursors to synthesize Fe-, Cu-, and Fe,Cu-decorated carbon materials through simple, straightforward, and inexpensive carbonization processes. Comprehensive characterization via SEM-EDS, TEM, XRD, and XPS established the formation of Fe3O4 and Cu2O species. These materials were systematically evaluated for OER and HER in alkaline electrolyte. Fe,Cu-decorated carbon electrocatalyst exhibited favorable performance for OER, including a low onset potential, and reaching 10 and 50 mA cm−2 at overpotential values of 325 mV and 364 mV, respectively. Notably, grafting both Fe and Cu in the material further augmented its electrocatalytic properties, underscoring the enhanced potential of transition metal-decorated carbon materials for OER applications. © 2024 The Author(s)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The quest for highly efficient, stable, and economically viable bifunctional electrocatalysts is of paramount relevance for advancing in water splitting for the hydrogen energy sector, particularly in facilitating hydrogen (HER) and oxygen evolution evolution (OER) as cathodic and anodic reaction, respectively. In this study, two ionic liquids containing transition metal Fe or Cu, as well as a mixture of these ionic liquids, were used as precursors to synthesize Fe-, Cu-, and Fe,Cu-decorated carbon materials through simple, straightforward, and inexpensive carbonization processes. Comprehensive characterization via SEM-EDS, TEM, XRD, and XPS established the formation of Fe3O4 and Cu2O species. These materials were systematically evaluated for OER and HER in alkaline electrolyte. Fe,Cu-decorated carbon electrocatalyst exhibited favorable performance for OER, including a low onset potential, and reaching 10 and 50 mA cm−2 at overpotential values of 325 mV and 364 mV, respectively. Notably, grafting both Fe and Cu in the material further augmented its electrocatalytic properties, underscoring the enhanced potential of transition metal-decorated carbon materials for OER applications. © 2024 The Author(s)
56.
Latas, Nemanja; Pjević, Dejan; Rajić, Vladimir; Ivanović, Milutin; Jugović, Dragana; Stojadinović, Stevan; Cvjetićanin, Nikola
Enhancing electrical and optical properties of anatase TiO2 nanotubes through electrochemical lithiation Journal Article
In: vol. 1005, 2024.
@article{Latas2024,
title = {Enhancing electrical and optical properties of anatase TiO2 nanotubes through electrochemical lithiation},
author = {Nemanja Latas and Dejan Pjević and Vladimir Rajić and Milutin Ivanović and Dragana Jugović and Stevan Stojadinović and Nikola Cvjetićanin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201671353&doi=10.1016%2fj.jallcom.2024.176081&partnerID=40&md5=84a332fa5c88e6cb5f67fb46ac805842},
doi = {10.1016/j.jallcom.2024.176081},
year = {2024},
date = {2024-01-01},
volume = {1005},
abstract = {In presented paper, anatase TiO2 nanotubes (NTs) were obtained by anodic oxidation of Ti-foil followed by subsequent annealing in air at 400 °C. After thermal treatment, TiO2 nanotubes (NTs) were electrochemically lithiated by means of galvanostatic (GS) discharge, as a part of GS cycling, at 25°C and 55 °C. Microstructural properties of the as-prepared material were observed by scanning and transmission electron microscopy (SEM, TEM), while changes in chemical bonding with lithiation were examined by X-ray photoelectron spectroscopy (XPS). Specific electrical conductivity, obtained by 4-point probe method, showed multifold increase after Li-ion insertion in TiO2 NTs, at both temperatures. By using diffuse reflectance spectroscopy (DRS), the decrease in energy gap, from 3.04 eV for the as-prepared TiO2 NTs to 2.81 eV for lithiated TiO2 NTs, was observed. The photoluminescence (PL) measurements suggest that Li-ion intercalation led to suppression of deep-level trap states within the bandgap, of TiO2 NTs, and promoted shallow defects associated to F-centers. Open-circuit photovoltage decay (OCVD) measurements confirm the promotion of shallow defect states. Furthermore, HER measurements indicate that the electrochemical lithiation is a promising strategy for enhancing the catalytic performance of TiO2. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In presented paper, anatase TiO2 nanotubes (NTs) were obtained by anodic oxidation of Ti-foil followed by subsequent annealing in air at 400 °C. After thermal treatment, TiO2 nanotubes (NTs) were electrochemically lithiated by means of galvanostatic (GS) discharge, as a part of GS cycling, at 25°C and 55 °C. Microstructural properties of the as-prepared material were observed by scanning and transmission electron microscopy (SEM, TEM), while changes in chemical bonding with lithiation were examined by X-ray photoelectron spectroscopy (XPS). Specific electrical conductivity, obtained by 4-point probe method, showed multifold increase after Li-ion insertion in TiO2 NTs, at both temperatures. By using diffuse reflectance spectroscopy (DRS), the decrease in energy gap, from 3.04 eV for the as-prepared TiO2 NTs to 2.81 eV for lithiated TiO2 NTs, was observed. The photoluminescence (PL) measurements suggest that Li-ion intercalation led to suppression of deep-level trap states within the bandgap, of TiO2 NTs, and promoted shallow defects associated to F-centers. Open-circuit photovoltage decay (OCVD) measurements confirm the promotion of shallow defect states. Furthermore, HER measurements indicate that the electrochemical lithiation is a promising strategy for enhancing the catalytic performance of TiO2. © 2024 Elsevier B.V.
57.
Obradović, Milena; Daković, Aleksandra; Smiljanić, Danijela; Marković, Marija; Ožegović, Milica; Krstić, Jugoslav; Vuković, Nikola; Milojević-Rakić, Maja
Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs Journal Article
In: vol. 12, no. 1, 2024.
@article{Obradović2024,
title = {Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs},
author = {Milena Obradović and Aleksandra Daković and Danijela Smiljanić and Marija Marković and Milica Ožegović and Jugoslav Krstić and Nikola Vuković and Maja Milojević-Rakić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85183378630&doi=10.3390%2fpr12010096&partnerID=40&md5=668340d679e06d556e0ba6a3eac0340f},
doi = {10.3390/pr12010096},
year = {2024},
date = {2024-01-01},
volume = {12},
number = {1},
abstract = {Organobentonites have been applied for the removal of two common non-steroidal anti-inflammatory drugs, ibuprofen (IBU) and diclofenac sodium (DS), from aqueous solutions. Two surfactants, one with and the other without benzyl group (octadecyldimethylbenzylammonium chloride, ODMBA, and hexadecyltrimethylammonium bromide, HDTMA), in amounts equivalent to 50, 75, and 100% of the cation exchange capacity of bentonite were used for the preparation of organobentonites. Successful modification of bentonite was confirmed by several methods: X-ray powder diffraction (XRPD), point of the zero charge (pHPZC), determination of exchanged inorganic cations in bentonite, determination of textural properties, and scanning electron microscopy (SEM). Kinetic and thermodynamic data on the adsorption of IBU and DS showed that drug adsorption was controlled by the type and the amount of surfactant incorporated into the bentonite and by their arrangement in the interlayer space and at the surface of organobentonites. The adsorption of both drugs increased with an increase in the amount of both surfactants in organobentonites. The presence of the benzyl group in organobentonites enhanced the adsorption of IBU and DS and was more pronounced for IBU. Drug adsorption fits the pseudo-second-order kinetic model the best. The thermodynamic data revealed that the adsorption process was endothermic in nature and with increase of the amount of both surfactants drug adsorption processes were more spontaneous. The results obtained from this study revealed that adsorbents based on surfactants modified bentonite are promising candidates for IBU and DS removal from contaminated water. © 2023 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Organobentonites have been applied for the removal of two common non-steroidal anti-inflammatory drugs, ibuprofen (IBU) and diclofenac sodium (DS), from aqueous solutions. Two surfactants, one with and the other without benzyl group (octadecyldimethylbenzylammonium chloride, ODMBA, and hexadecyltrimethylammonium bromide, HDTMA), in amounts equivalent to 50, 75, and 100% of the cation exchange capacity of bentonite were used for the preparation of organobentonites. Successful modification of bentonite was confirmed by several methods: X-ray powder diffraction (XRPD), point of the zero charge (pHPZC), determination of exchanged inorganic cations in bentonite, determination of textural properties, and scanning electron microscopy (SEM). Kinetic and thermodynamic data on the adsorption of IBU and DS showed that drug adsorption was controlled by the type and the amount of surfactant incorporated into the bentonite and by their arrangement in the interlayer space and at the surface of organobentonites. The adsorption of both drugs increased with an increase in the amount of both surfactants in organobentonites. The presence of the benzyl group in organobentonites enhanced the adsorption of IBU and DS and was more pronounced for IBU. Drug adsorption fits the pseudo-second-order kinetic model the best. The thermodynamic data revealed that the adsorption process was endothermic in nature and with increase of the amount of both surfactants drug adsorption processes were more spontaneous. The results obtained from this study revealed that adsorbents based on surfactants modified bentonite are promising candidates for IBU and DS removal from contaminated water. © 2023 by the authors.
58.
Al-Hamry, Ammar; Pan, Yang; Rahaman, Mahfujur; Selyshchev, Oleksandr; Tegenkamp, Christoph; Zahn, Dietrich R. T.; Pašti, Igor A.; Kanoun, Olfa
Toward Humidity-Independent Sensitive and Fast Response Temperature Sensors Based on Reduced Graphene Oxide/Poly(vinyl alcohol) Nanocomposites Journal Article
In: vol. 6, no. 6, pp. 4718 – 4734, 2024.
@article{Al-Hamry20244718,
title = {Toward Humidity-Independent Sensitive and Fast Response Temperature Sensors Based on Reduced Graphene Oxide/Poly(vinyl alcohol) Nanocomposites},
author = {Ammar Al-Hamry and Yang Pan and Mahfujur Rahaman and Oleksandr Selyshchev and Christoph Tegenkamp and Dietrich R. T. Zahn and Igor A. Pašti and Olfa Kanoun},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85194955422&doi=10.1021%2facsaelm.4c00729&partnerID=40&md5=794b43cc43d83c68c2425cc6d23dbf9c},
doi = {10.1021/acsaelm.4c00729},
year = {2024},
date = {2024-01-01},
volume = {6},
number = {6},
pages = {4718 – 4734},
abstract = {Flexible temperature sensors are becoming increasingly important these days. In this work, we explore graphene oxide (GO)/poly(vinyl alcohol) (PVA) nanocomposites for potential application in temperature sensors. The influence of the mixing ratio of both materials, the reduction temperature, and passivation on the sensing performance has been investigated. Various spectroscopic techniques revealed the composite structure and atomic composition. These were complemented by semiempirical quantum chemical calculations to investigate rGO and PVA interaction. Scanning electron and atomic force microscopy measurements were carried out to evaluate dispersion and coated film quality. The temperature sensitivity has been evaluated for several composite materials with different compositions in the range from 10 to 80 °C. The results show that a linear temperature behavior can be realized based on rGO/PVA composites with temperature coefficients of resistance (TCR) larger than 1.8% K-1 and a fast response time of 0.3 s with minimal hysteresis. Furthermore, humidity influence has been investigated in the range from 10% to 80%, and a minor effect is shown. Therefore, we can conclude that rGO/PVA composites have a high potential for excellent passivation-free, humidity-independent, sensitive, and fast response temperature sensors for various applications. The GO reduction is tunable, and PVA improves the rGO/PVA sensor performance by increasing the tunneling effect and band gap energy, consequently improving temperature sensitivity. Additionally, PVA exhibits minimal water absorption, reducing the humidity sensitivity. rGO/PVA maintains its temperature sensitivity during and after several mechanical deformations. © 2024 The Authors. Published by American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Flexible temperature sensors are becoming increasingly important these days. In this work, we explore graphene oxide (GO)/poly(vinyl alcohol) (PVA) nanocomposites for potential application in temperature sensors. The influence of the mixing ratio of both materials, the reduction temperature, and passivation on the sensing performance has been investigated. Various spectroscopic techniques revealed the composite structure and atomic composition. These were complemented by semiempirical quantum chemical calculations to investigate rGO and PVA interaction. Scanning electron and atomic force microscopy measurements were carried out to evaluate dispersion and coated film quality. The temperature sensitivity has been evaluated for several composite materials with different compositions in the range from 10 to 80 °C. The results show that a linear temperature behavior can be realized based on rGO/PVA composites with temperature coefficients of resistance (TCR) larger than 1.8% K-1 and a fast response time of 0.3 s with minimal hysteresis. Furthermore, humidity influence has been investigated in the range from 10% to 80%, and a minor effect is shown. Therefore, we can conclude that rGO/PVA composites have a high potential for excellent passivation-free, humidity-independent, sensitive, and fast response temperature sensors for various applications. The GO reduction is tunable, and PVA improves the rGO/PVA sensor performance by increasing the tunneling effect and band gap energy, consequently improving temperature sensitivity. Additionally, PVA exhibits minimal water absorption, reducing the humidity sensitivity. rGO/PVA maintains its temperature sensitivity during and after several mechanical deformations. © 2024 The Authors. Published by American Chemical Society.
59.
Ležaić, Aleksandra Janošević; Bajuk-Bogdanović, Danica; Ćirić-Marjanović, Gordana
In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity Journal Article
In: vol. 305, 2024.
@article{JanoševićLežaić2024,
title = {In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity},
author = {Aleksandra Janošević Ležaić and Danica Bajuk-Bogdanović and Gordana Ćirić-Marjanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189563065&doi=10.1016%2fj.synthmet.2024.117602&partnerID=40&md5=97d369b09fbb3c19a864525c28d88fa2},
doi = {10.1016/j.synthmet.2024.117602},
year = {2024},
date = {2024-01-01},
volume = {305},
abstract = {In situ Raman spectroscopy was used for the first time to study the reaction intermediates/products of the oxidative polymerization of aniline to polyaniline (PANI) with peroxydisulfate in aqueous solutions of different initial acidity. Raman spectra were recorded for the drops of reaction mixture taken at various reaction times. Five reaction systems with different pH of the monomer solution (pHmon), leading to 1-D nanostructured PANIs (pHmon =5.8, 4.6 and 4.5) and granular PANIs (pHmon= 3.4 and 1.0) were explored. Spectral characteristics of different reaction phases - athermal, exothermic and post-propagation were identified and correlated with the proposed mechanisms of aniline polymerization and nanostructures formation. For the nanostructured PANIs, the athermal phase was characterized by pronounced strengthening of the δ(N−H)/ν(C[dbnd]N)Q band at 1510–1520 cm−1, while the characteristic of the second exothermic phase was the strengthening of the ν(C∼C)B/ν(C∼C)Phz band at c.a. 1636 cm−1 which becomes stronger than the ν(C[dbnd]C)Q/ν(C∼C)SQ band at c.a. 1590 cm–1. For granular PANIs, the band at 1590 cm–1 was stronger than that at 1630 cm–1 for all reaction phases. For all reaction systems, characteristic feature of the post-propagation phase was strengthening of the ν(C∼N+•) band at 1330–1340 cm−1 due to delocalized polarons. For granular PANIs, the band associated with phenazine-like units at c.a. 1415 cm−1 disappeared after the exothermic phase, while for nanostructured PANIs it was seen until the end of the reaction. The obtained results are expected to be useful in further investigations of the intermediates/products and mechanisms of polymerizations of other aromatic amines. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In situ Raman spectroscopy was used for the first time to study the reaction intermediates/products of the oxidative polymerization of aniline to polyaniline (PANI) with peroxydisulfate in aqueous solutions of different initial acidity. Raman spectra were recorded for the drops of reaction mixture taken at various reaction times. Five reaction systems with different pH of the monomer solution (pHmon), leading to 1-D nanostructured PANIs (pHmon =5.8, 4.6 and 4.5) and granular PANIs (pHmon= 3.4 and 1.0) were explored. Spectral characteristics of different reaction phases - athermal, exothermic and post-propagation were identified and correlated with the proposed mechanisms of aniline polymerization and nanostructures formation. For the nanostructured PANIs, the athermal phase was characterized by pronounced strengthening of the δ(N−H)/ν(C[dbnd]N)Q band at 1510–1520 cm−1, while the characteristic of the second exothermic phase was the strengthening of the ν(C∼C)B/ν(C∼C)Phz band at c.a. 1636 cm−1 which becomes stronger than the ν(C[dbnd]C)Q/ν(C∼C)SQ band at c.a. 1590 cm–1. For granular PANIs, the band at 1590 cm–1 was stronger than that at 1630 cm–1 for all reaction phases. For all reaction systems, characteristic feature of the post-propagation phase was strengthening of the ν(C∼N+•) band at 1330–1340 cm−1 due to delocalized polarons. For granular PANIs, the band associated with phenazine-like units at c.a. 1415 cm−1 disappeared after the exothermic phase, while for nanostructured PANIs it was seen until the end of the reaction. The obtained results are expected to be useful in further investigations of the intermediates/products and mechanisms of polymerizations of other aromatic amines. © 2024 Elsevier B.V.
60.
Milikić, Jadranka; Gusmão, Filipe; Knežević, Sara; Gavrilov, Nemanja; Paul, Anup; Santos, Diogo M. F.; Šljukić, Biljana
Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis Journal Article
In: vol. 10, no. 6, 2024.
@article{Milikić2024b,
title = {Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis},
author = {Jadranka Milikić and Filipe Gusmão and Sara Knežević and Nemanja Gavrilov and Anup Paul and Diogo M. F. Santos and Biljana Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85197117833&doi=10.3390%2fbatteries10060197&partnerID=40&md5=ea95fac1edbe8f45d73e97fab670606e},
doi = {10.3390/batteries10060197},
year = {2024},
date = {2024-01-01},
volume = {10},
number = {6},
abstract = {Polyoxometalates (POMs) with transition metals (Co, Cu, Fe, Mn, Ni) of Keggin structure and lamellar-stacked multi-layer morphology were synthesized. They were subsequently explored as bifunctional electrocatalysts for oxygen electrodes, i.e., oxygen reduction (ORR) and evolution (OER) reaction, for aqueous rechargeable metal-air batteries in alkaline media. The lowest Tafel slope (85 mV dec−1) value and the highest OER current density of 93.8 mA cm−2 were obtained for the Fe-POM electrocatalyst. Similar OER electrochemical catalytic activity was noticed for the Co-POM electrocatalyst. This behavior was confirmed by electrochemical impedance spectroscopy, where Fe-POM gave the lowest charge transfer resistance of 3.35 Ω, followed by Co-POM with Rct of 15.04 Ω, during the OER. Additionally, Tafel slope values of 85 and 109 mV dec−1 were calculated for Fe-POM and Co-POM, respectively, during the ORR. The ORR at Fe-POM proceeded by mixed two- and four-electron pathways, while ORR at Co-POM proceeded exclusively by the four-electron pathway. Finally, capacitance studies were conducted on the synthesized POMs. © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polyoxometalates (POMs) with transition metals (Co, Cu, Fe, Mn, Ni) of Keggin structure and lamellar-stacked multi-layer morphology were synthesized. They were subsequently explored as bifunctional electrocatalysts for oxygen electrodes, i.e., oxygen reduction (ORR) and evolution (OER) reaction, for aqueous rechargeable metal-air batteries in alkaline media. The lowest Tafel slope (85 mV dec−1) value and the highest OER current density of 93.8 mA cm−2 were obtained for the Fe-POM electrocatalyst. Similar OER electrochemical catalytic activity was noticed for the Co-POM electrocatalyst. This behavior was confirmed by electrochemical impedance spectroscopy, where Fe-POM gave the lowest charge transfer resistance of 3.35 Ω, followed by Co-POM with Rct of 15.04 Ω, during the OER. Additionally, Tafel slope values of 85 and 109 mV dec−1 were calculated for Fe-POM and Co-POM, respectively, during the ORR. The ORR at Fe-POM proceeded by mixed two- and four-electron pathways, while ORR at Co-POM proceeded exclusively by the four-electron pathway. Finally, capacitance studies were conducted on the synthesized POMs. © 2024 by the authors.
2024
Stojanović, Jevrem; Milojević-Rakić, Maja; Bajuk-Bogdanović, Danica; Ranđelović, Dragana; Sokić, Miroslav; Otašević, Biljana; Malenović, Anđelija; Ležaić, Aleksandra Janošević; Protić, Ana
In: vol. 10, no. 14, 2024.
@article{Stojanović2024,
title = {Chemometrically-aided general approach to novel adsorbents studies: Case study on the adsorption of pharmaceuticals by the carbonized Ailanthus altissima leaves},
author = {Jevrem Stojanović and Maja Milojević-Rakić and Danica Bajuk-Bogdanović and Dragana Ranđelović and Miroslav Sokić and Biljana Otašević and Anđelija Malenović and Aleksandra Janošević Ležaić and Ana Protić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199005411&doi=10.1016%2fj.heliyon.2024.e34841&partnerID=40&md5=6921303b78010ad4343e6a6953e5f31d},
doi = {10.1016/j.heliyon.2024.e34841},
year = {2024},
date = {2024-01-01},
volume = {10},
number = {14},
abstract = {A chemometrically based approach was applied to select the most efficient drug adsorbent among the biochars obtained from the novel feedstock, the leaves of the invasive plant (Ailanthus altissima). The representative target adsorbates (atenolol, paracetamol, ketorolac and tetracycline) were selected on the basis of their physicochemical properties to cover a wide chemical space, which is the usual analytical challenge. Their adsorption was investigated using design of experiments as a comprehensive approach to optimise the performance of the adsorption system, rationalise the procedure and overcome common drawbacks. Among the response surface designs, the central composite design was selected as it allows the identification of important experimental factors (solid-to-liquid ratio, pH, ionic strength) and their interactions, and allows the selection of optimal experimental conditions to maximise adsorption performance. The biochars were prepared by pyrolysis at 500 °C and 800 °C (BC-500 and BC-800) and the ZnCl2-activated biochars were prepared at 650 °C and 800 °C (AcBC-650 and AcBC-800). The FTIR spectra revealed that increasing the pyrolysis temperature without activator decreases the intensity of all bands, while activation preserves functional groups, as evidenced by the spectra of AcBC-650 and AcBC-800. High temperatures during activation promoted the development of an efficient surface area, with the maximum observed for AcBC-800 reaching 347 m2 g−1. AcBC-800 was found to be the most efficient adsorbent with removal efficiencies of 34.1, 51.3, 55.9 and 38.2 % for atenolol, paracetamol, ketorolac and tetracycline, respectively. The models describing the relationship between the removal efficiency of AcBC-800 and the experimental factors studied, showed satisfactory predictive ability (predicted R2 > 0.8) and no significant lack-of-fit was observed. The results obtained, including the mathematical models, the properties of the adsorbates and the adsorbents, clearly indicate that the adsorption mechanisms of activated biochars are mainly based on hydrophobic interactions, pore filling and hydrogen bonding. © 2024 The Authors},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A chemometrically based approach was applied to select the most efficient drug adsorbent among the biochars obtained from the novel feedstock, the leaves of the invasive plant (Ailanthus altissima). The representative target adsorbates (atenolol, paracetamol, ketorolac and tetracycline) were selected on the basis of their physicochemical properties to cover a wide chemical space, which is the usual analytical challenge. Their adsorption was investigated using design of experiments as a comprehensive approach to optimise the performance of the adsorption system, rationalise the procedure and overcome common drawbacks. Among the response surface designs, the central composite design was selected as it allows the identification of important experimental factors (solid-to-liquid ratio, pH, ionic strength) and their interactions, and allows the selection of optimal experimental conditions to maximise adsorption performance. The biochars were prepared by pyrolysis at 500 °C and 800 °C (BC-500 and BC-800) and the ZnCl2-activated biochars were prepared at 650 °C and 800 °C (AcBC-650 and AcBC-800). The FTIR spectra revealed that increasing the pyrolysis temperature without activator decreases the intensity of all bands, while activation preserves functional groups, as evidenced by the spectra of AcBC-650 and AcBC-800. High temperatures during activation promoted the development of an efficient surface area, with the maximum observed for AcBC-800 reaching 347 m2 g−1. AcBC-800 was found to be the most efficient adsorbent with removal efficiencies of 34.1, 51.3, 55.9 and 38.2 % for atenolol, paracetamol, ketorolac and tetracycline, respectively. The models describing the relationship between the removal efficiency of AcBC-800 and the experimental factors studied, showed satisfactory predictive ability (predicted R2 > 0.8) and no significant lack-of-fit was observed. The results obtained, including the mathematical models, the properties of the adsorbates and the adsorbents, clearly indicate that the adsorption mechanisms of activated biochars are mainly based on hydrophobic interactions, pore filling and hydrogen bonding. © 2024 The Authors
Kasalović, Marijana P.; Dimić, Dušan; Jelača, Sanja; Maksimović-Ivanić, Danijela; Mijatović, Sanja; Zmejkovski, Bojana B.; Schreiner, Simon H. F.; Rüffer, Tobias; Pantelić, Nebojša Đ.; Kaluđerović, Goran N.
In: vol. 17, no. 3, 2024.
@article{Kasalović2024,
title = {Trimethyltin(IV) Bearing 3-(4-Methyl-2-oxoquinolin-1(2H)-yl)propanoate Causes Lipid Peroxidation-Mediated Autophagic Cell Death in Human Melanoma A375 Cells},
author = {Marijana P. Kasalović and Dušan Dimić and Sanja Jelača and Danijela Maksimović-Ivanić and Sanja Mijatović and Bojana B. Zmejkovski and Simon H. F. Schreiner and Tobias Rüffer and Nebojša Đ. Pantelić and Goran N. Kaluđerović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188933378&doi=10.3390%2fph17030372&partnerID=40&md5=b818b7c82252caec6f2d466f9ecdb065},
doi = {10.3390/ph17030372},
year = {2024},
date = {2024-01-01},
volume = {17},
number = {3},
abstract = {A novel trimethyltin(IV) complex (Me3SnL), derived from 3-(4-methyl-2-oxoquinolin-1(2H)-yl)propanoate ligand, has been synthesized and characterized by elemental microanalysis, UV/Vis spectrophotometry, FT-IR and multinuclear (1H, 13C and 119Sn) NMR spectroscopies. Furthermore, the structure of the ligand precursor HL was solved using SC-XRD (single-crystal X-ray diffraction). The prediction of UV/Vis and NMR spectra by quantum-chemical methods was performed and compared to experimental findings. The protein binding affinity of Me3SnL towards BSA was determined by spectrofluorometric titration and subsequent molecular docking simulations. Me3SnL has been evaluated for its in vitro anticancer activity against three human cell lines, MCF-7 (breast adenocarcinoma), A375 (melanoma) and HCT116 (colorectal carcinoma), and three mouse tumor cell lines, 4T1 (breast carcinoma), B16 (melanoma) and CT26 (colon carcinoma), using MTT and CV assays. The strong inhibition of A375 cell proliferation, ROS/RNS upregulation and robust lipid peroxidation lead to autophagic cell death upon treatment with Me3SnL. © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A novel trimethyltin(IV) complex (Me3SnL), derived from 3-(4-methyl-2-oxoquinolin-1(2H)-yl)propanoate ligand, has been synthesized and characterized by elemental microanalysis, UV/Vis spectrophotometry, FT-IR and multinuclear (1H, 13C and 119Sn) NMR spectroscopies. Furthermore, the structure of the ligand precursor HL was solved using SC-XRD (single-crystal X-ray diffraction). The prediction of UV/Vis and NMR spectra by quantum-chemical methods was performed and compared to experimental findings. The protein binding affinity of Me3SnL towards BSA was determined by spectrofluorometric titration and subsequent molecular docking simulations. Me3SnL has been evaluated for its in vitro anticancer activity against three human cell lines, MCF-7 (breast adenocarcinoma), A375 (melanoma) and HCT116 (colorectal carcinoma), and three mouse tumor cell lines, 4T1 (breast carcinoma), B16 (melanoma) and CT26 (colon carcinoma), using MTT and CV assays. The strong inhibition of A375 cell proliferation, ROS/RNS upregulation and robust lipid peroxidation lead to autophagic cell death upon treatment with Me3SnL. © 2024 by the authors.
Alshammari, Odeh Abdullah Odeh; Maisara, Sawsan; Alshammari, Badriah; Alshammari, Maha Raghyan; Rakic, Violeta; Marković, Jasmina Dimitrić; Jevtovic, Violeta; Dimić, Dušan
In: vol. 29, no. 6, 2024.
@article{Alshammari2024,
title = {Theoretical Insights into Different Complexation Modes of Dioxovanadium(V) Compounds with Pyridoxal Semicarbazone/Thiosemicarbazone/S-Methyl-iso-thiosemicarbazone Ligands},
author = {Odeh Abdullah Odeh Alshammari and Sawsan Maisara and Badriah Alshammari and Maha Raghyan Alshammari and Violeta Rakic and Jasmina Dimitrić Marković and Violeta Jevtovic and Dušan Dimić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189172147&doi=10.3390%2fmolecules29061213&partnerID=40&md5=3755482d5aa4cdfdb77942d604a062f8},
doi = {10.3390/molecules29061213},
year = {2024},
date = {2024-01-01},
volume = {29},
number = {6},
abstract = {Vanadium complexes have gained considerable attention as biologically active compounds. In this contribution, three previously reported dioxovanadium(V) complexes with pyridoxal semicarbazone, thiosemicarbazone, and S-methyl-iso-thiosemicarbazone ligands are theoretically examined. The intermolecular stabilization interactions within crystallographic structures were investigated by Hirshfeld surface analysis. These experimental structures were optimized at the B3LYP-D3BJ/6-311++G(d,p)(H,C,N,O,S)/def2-TZVP(V) level of theory, and crystallographic and optimized bond lengths and angles were compared. High correlation coefficients and low mean absolute errors between these two data sets proved that the selected level of theory was appropriate for the description of the system. The changes in structures and stability were examined by adding explicit solvent molecules. The Quantum Theory of Atoms in Molecules (QTAIM) was employed to analyze the intramolecular interactions with special emphasis on the effect of substituents. A good correlation between electron density/Laplacian and interatomic distance was found. Through molecular docking simulations towards Bovine Serum Albumin (BSA), the binding affinity of complexes was further investigated. The spontaneity of binding in the active position of BSA was shown. Further experimental studies on this class of compounds are advised. © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vanadium complexes have gained considerable attention as biologically active compounds. In this contribution, three previously reported dioxovanadium(V) complexes with pyridoxal semicarbazone, thiosemicarbazone, and S-methyl-iso-thiosemicarbazone ligands are theoretically examined. The intermolecular stabilization interactions within crystallographic structures were investigated by Hirshfeld surface analysis. These experimental structures were optimized at the B3LYP-D3BJ/6-311++G(d,p)(H,C,N,O,S)/def2-TZVP(V) level of theory, and crystallographic and optimized bond lengths and angles were compared. High correlation coefficients and low mean absolute errors between these two data sets proved that the selected level of theory was appropriate for the description of the system. The changes in structures and stability were examined by adding explicit solvent molecules. The Quantum Theory of Atoms in Molecules (QTAIM) was employed to analyze the intramolecular interactions with special emphasis on the effect of substituents. A good correlation between electron density/Laplacian and interatomic distance was found. Through molecular docking simulations towards Bovine Serum Albumin (BSA), the binding affinity of complexes was further investigated. The spontaneity of binding in the active position of BSA was shown. Further experimental studies on this class of compounds are advised. © 2024 by the authors.
Milikić, Jadranka; Nastasić, Ana; Rakočević, Lazar; Radinović, Kristina; Stojadinović, Stevan; Stanković, Dalibor; Šljukić, Biljana
FeM/rGO (M = Ni and Cu) as bifunctional oxygen electrode Journal Article
In: vol. 368, 2024.
@article{Milikić2024c,
title = {FeM/rGO (M = Ni and Cu) as bifunctional oxygen electrode},
author = {Jadranka Milikić and Ana Nastasić and Lazar Rakočević and Kristina Radinović and Stevan Stojadinović and Dalibor Stanković and Biljana Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189750538&doi=10.1016%2fj.fuel.2024.131654&partnerID=40&md5=357db3e6f5a5aea0d0e8d2cf8351f164},
doi = {10.1016/j.fuel.2024.131654},
year = {2024},
date = {2024-01-01},
volume = {368},
abstract = {Three different iron-based electrocatalysts deposited on reduced graphene oxide (Fe/rGO, FeNi/rGO, and FeCu/rGO) were synthesized and examined for oxygen reduction and evolution reactions (ORR and OER, respectively) in alkaline media. X-ray powder diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy were used for a thorough investigation of physico-chemical properties of FeM/rGO electrocatalysts. XPS analysis indicated the presence of transition metals in higher oxidation states. Onset potentials during OER were found to be 1.51, 1.64, and 1.71 V for FeNi/rGO, FeCu/rGO, and Fe/rGO, respectively. Moreover, FeNi/rGO showed the highest OER current density (∼40 mA cm−2 at 2 V), two times higher than the benchmark OER electrocatalyst, IrO2, and the lowest Tafel slope (88 mV dec-1), lower than IrO2. The somewhat better catalytic activity of Fe/rGO for ORR in alkaline media compared to FeNi/rGO and FeCu/rGO was noticed. Tafel slopes of 105, 112, and 113 mV dec-1 during ORR were found for Fe/rGO, FeCu/rGO, and FeNi/rGO, respectively. Almost constant ORR current densities during chronoamperometric measurements were noticed for Fe/rGO and FeCu/rGO indicating stable performance. © 2024 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Three different iron-based electrocatalysts deposited on reduced graphene oxide (Fe/rGO, FeNi/rGO, and FeCu/rGO) were synthesized and examined for oxygen reduction and evolution reactions (ORR and OER, respectively) in alkaline media. X-ray powder diffraction analysis, Fourier transform infrared spectroscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy were used for a thorough investigation of physico-chemical properties of FeM/rGO electrocatalysts. XPS analysis indicated the presence of transition metals in higher oxidation states. Onset potentials during OER were found to be 1.51, 1.64, and 1.71 V for FeNi/rGO, FeCu/rGO, and Fe/rGO, respectively. Moreover, FeNi/rGO showed the highest OER current density (∼40 mA cm−2 at 2 V), two times higher than the benchmark OER electrocatalyst, IrO2, and the lowest Tafel slope (88 mV dec-1), lower than IrO2. The somewhat better catalytic activity of Fe/rGO for ORR in alkaline media compared to FeNi/rGO and FeCu/rGO was noticed. Tafel slopes of 105, 112, and 113 mV dec-1 during ORR were found for Fe/rGO, FeCu/rGO, and FeNi/rGO, respectively. Almost constant ORR current densities during chronoamperometric measurements were noticed for Fe/rGO and FeCu/rGO indicating stable performance. © 2024 Elsevier Ltd
Stamenković, Tijana; Zdolšek, Nikola; Vujković, Milica; Brković, Snežana; Perović, Ivana; Lojpur, Vesna
Boosting electrochemical energy storage properties of SrGd2O4 through Yb3+ and Tm3+ rare earth ion doping Journal Article
In: vol. 495, 2024.
@article{Stamenković2024,
title = {Boosting electrochemical energy storage properties of SrGd2O4 through Yb3+ and Tm3+ rare earth ion doping},
author = {Tijana Stamenković and Nikola Zdolšek and Milica Vujković and Snežana Brković and Ivana Perović and Vesna Lojpur},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85194309877&doi=10.1016%2fj.electacta.2024.144489&partnerID=40&md5=0c551409fb2a10edf6021e88783bc26a},
doi = {10.1016/j.electacta.2024.144489},
year = {2024},
date = {2024-01-01},
volume = {495},
abstract = {Electrochemical supercapacitors represent advanced energy storage devices that excel in the swift storage and delivery of electrical energy, effectively bridging the gap between conventional capacitors and batteries. The present work, aimed to investigate charge storage properties of SrGd2O4 and rare earth ions Yb3+ and Tm3+ doped in SrGd2O4. Both materials were prepared via simple sol-gel synthesis and characterized by XRD, XPS, and FE-SEM with EDS. Characterization confirmed the presence of Tm3+ and Yb3+ in the SrGd2O4 matrix with a uniform distribution of elements. The charge storage behavior of pure SrGd2O4 and SrGd2O4:Yb4Tm1 in various electrolytes was thoroughly explored. Large electrochemical potential windows were shown by both electrode materials in aqueous 6 M KOH (1.7 V), which is essential for supercapacitors to achieve high specific energy. Furthermore, SrGd2O4:Yb4Tm1 demonstrated a substantially more pronounced charge storage effect in 6 M KOH electrolyte, with almost double times higher specific capacitance values compared with an un-doped SrGd2O4 sample. The main impact on the electrochemical window had matrix SrGd2O4, while the main impact on specific capacitance had rear earth dopants (Yb3+ and Tm3+). Improved charge storage characteristics of SrGd2O4:Yb4Tm1 were also evident through a notable reduction in overall resistance observed in electrochemical impedance spectroscopy experiments. Concerning the two-electrode GCD measurements, the SrGd2O4:Yb4Tm1 electrode in 6 M KOH showed a specific capacitance of 143 F g−1, with the specific energy of 12.5 Wh kg−1 at 0.6 A g−1. These findings demonstrate the potential of rare earth ion doping in enhancing the energy storage properties of SrGd2O4, offering promising avenues for the development of high-performance supercapacitors. © 2024 Elsevier Ltd},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Electrochemical supercapacitors represent advanced energy storage devices that excel in the swift storage and delivery of electrical energy, effectively bridging the gap between conventional capacitors and batteries. The present work, aimed to investigate charge storage properties of SrGd2O4 and rare earth ions Yb3+ and Tm3+ doped in SrGd2O4. Both materials were prepared via simple sol-gel synthesis and characterized by XRD, XPS, and FE-SEM with EDS. Characterization confirmed the presence of Tm3+ and Yb3+ in the SrGd2O4 matrix with a uniform distribution of elements. The charge storage behavior of pure SrGd2O4 and SrGd2O4:Yb4Tm1 in various electrolytes was thoroughly explored. Large electrochemical potential windows were shown by both electrode materials in aqueous 6 M KOH (1.7 V), which is essential for supercapacitors to achieve high specific energy. Furthermore, SrGd2O4:Yb4Tm1 demonstrated a substantially more pronounced charge storage effect in 6 M KOH electrolyte, with almost double times higher specific capacitance values compared with an un-doped SrGd2O4 sample. The main impact on the electrochemical window had matrix SrGd2O4, while the main impact on specific capacitance had rear earth dopants (Yb3+ and Tm3+). Improved charge storage characteristics of SrGd2O4:Yb4Tm1 were also evident through a notable reduction in overall resistance observed in electrochemical impedance spectroscopy experiments. Concerning the two-electrode GCD measurements, the SrGd2O4:Yb4Tm1 electrode in 6 M KOH showed a specific capacitance of 143 F g−1, with the specific energy of 12.5 Wh kg−1 at 0.6 A g−1. These findings demonstrate the potential of rare earth ion doping in enhancing the energy storage properties of SrGd2O4, offering promising avenues for the development of high-performance supercapacitors. © 2024 Elsevier Ltd
Gandara, Meriene; Mladenović, Dušan; de Jesus Oliveira Martins, Marta; Rakocevic, Lazar; de Assis, João Marcos Kruszynski; Šljukić, Biljana; Gonçalves, Emerson Sarmento
MAX Phase (Nb4AlC3) For Electrocatalysis Applications Journal Article
In: vol. 20, no. 29, 2024.
@article{Gandara2024b,
title = {MAX Phase (Nb4AlC3) For Electrocatalysis Applications},
author = {Meriene Gandara and Dušan Mladenović and Marta de Jesus Oliveira Martins and Lazar Rakocevic and João Marcos Kruszynski de Assis and Biljana Šljukić and Emerson Sarmento Gonçalves},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85187258693&doi=10.1002%2fsmll.202310576&partnerID=40&md5=a11dee3380c72bd31a8b969353db9ede},
doi = {10.1002/smll.202310576},
year = {2024},
date = {2024-01-01},
volume = {20},
number = {29},
abstract = {In search for novel materials to replace noble metal-based electrocatalysts in electrochemical energy conversion and storage devices, special attention is given to a distinct class of materials, MAX phase that combines advantages of ceramic and metallic properties. Herein, Nb4AlC3 MAX phase is prepared by a solid-state mixing reaction and characterized morphologically and structurally by transmission and scanning electron microscopy with energy-dispersive X-ray spectroscopy, nitrogen-sorption, X-ray diffraction analysis, X-ray photoelectron and Raman spectroscopy. Electrochemical performance of Nb4AlC3 in terms of capacitance as well as for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is evaluated in different electrolytes. The specific capacitance Cs of 66.4, 55.0, and 46.0 F g−1 at 5 mV s−1 is determined for acidic, neutral and alkaline medium, respectively. Continuous cycling reveals high capacitance retention in three electrolyte media; moreover, increase of capacitance is observed in acidic and neutral media. The electrochemical impedance spectroscopy showed a low charge transfer resistance of 64.76 Ω cm2 that resulted in better performance for HER in acidic medium (Tafel slope of 60 mV dec−1). In alkaline media, the charge storage value in the double layer is 360 mF cm−2 (0.7 V versus reversible hydrogen electrode) and the best ORR performance of the Nb4AlC3 is achieved in this medium (Tafel slope of 126 mV dec−1). © 2024 Wiley-VCH GmbH.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In search for novel materials to replace noble metal-based electrocatalysts in electrochemical energy conversion and storage devices, special attention is given to a distinct class of materials, MAX phase that combines advantages of ceramic and metallic properties. Herein, Nb4AlC3 MAX phase is prepared by a solid-state mixing reaction and characterized morphologically and structurally by transmission and scanning electron microscopy with energy-dispersive X-ray spectroscopy, nitrogen-sorption, X-ray diffraction analysis, X-ray photoelectron and Raman spectroscopy. Electrochemical performance of Nb4AlC3 in terms of capacitance as well as for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is evaluated in different electrolytes. The specific capacitance Cs of 66.4, 55.0, and 46.0 F g−1 at 5 mV s−1 is determined for acidic, neutral and alkaline medium, respectively. Continuous cycling reveals high capacitance retention in three electrolyte media; moreover, increase of capacitance is observed in acidic and neutral media. The electrochemical impedance spectroscopy showed a low charge transfer resistance of 64.76 Ω cm2 that resulted in better performance for HER in acidic medium (Tafel slope of 60 mV dec−1). In alkaline media, the charge storage value in the double layer is 360 mF cm−2 (0.7 V versus reversible hydrogen electrode) and the best ORR performance of the Nb4AlC3 is achieved in this medium (Tafel slope of 126 mV dec−1). © 2024 Wiley-VCH GmbH.
Jovanović, Vojislav; Petrušić, Igor; Savić, Andrej; Ković, Vanja
Processing of visual hapaxes in picture naming task: An event-related potential study Journal Article
In: vol. 203, 2024.
@article{Jovanović2024,
title = {Processing of visual hapaxes in picture naming task: An event-related potential study},
author = {Vojislav Jovanović and Igor Petrušić and Andrej Savić and Vanja Ković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199719584&doi=10.1016%2fj.ijpsycho.2024.112394&partnerID=40&md5=1f6639a82b558c7790ec168ad78cd8e2},
doi = {10.1016/j.ijpsycho.2024.112394},
year = {2024},
date = {2024-01-01},
volume = {203},
abstract = {Object recognition and visual categorization are typically swift and seemingly effortless tasks that involve numerous underlying processes. In our investigation, we utilized a picture naming task to explore the processing of rarely encountered objects (visual hapaxes) in comparison to common objects. Our aim was to determine the stage at which these rare objects are classified as unnamable. Contrary to our expectations and in contrast to some prior research on event-related potentials (ERPs) with novel and atypical objects, no differences between conditions were observed in the late time windows corresponding to the P300 or N400 components. However, distinctive patterns between hapaxes and common objects surfaced in three early time windows, corresponding to the posterior N1 and P2 waves, as well as a widespread N2 wave. According to the ERP data, the differentiation between hapaxes and common objects occurs within the first 380 ms of the processing line, involving only limited and indirect top-down influence. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Object recognition and visual categorization are typically swift and seemingly effortless tasks that involve numerous underlying processes. In our investigation, we utilized a picture naming task to explore the processing of rarely encountered objects (visual hapaxes) in comparison to common objects. Our aim was to determine the stage at which these rare objects are classified as unnamable. Contrary to our expectations and in contrast to some prior research on event-related potentials (ERPs) with novel and atypical objects, no differences between conditions were observed in the late time windows corresponding to the P300 or N400 components. However, distinctive patterns between hapaxes and common objects surfaced in three early time windows, corresponding to the posterior N1 and P2 waves, as well as a widespread N2 wave. According to the ERP data, the differentiation between hapaxes and common objects occurs within the first 380 ms of the processing line, involving only limited and indirect top-down influence. © 2024 Elsevier B.V.
Petrušić, Igor; Martelletti, Paolo
Comment on "What predicts citation counts and translational impact in headache research? A machine learning analysis" Journal Article
In: vol. 44, no. 8, pp. 3331024241266980, 2024.
@article{Petrušić20243331024241266980,
title = {Comment on "What predicts citation counts and translational impact in headache research? A machine learning analysis"},
author = {Igor Petrušić and Paolo Martelletti},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85200527563&doi=10.1177%2f03331024241266980&partnerID=40&md5=9ca138deccef15dff307eb5c095b6c7c},
doi = {10.1177/03331024241266980},
year = {2024},
date = {2024-01-01},
volume = {44},
number = {8},
pages = {3331024241266980},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Milanović, Žiko; Dimić, Dušan; Avdović, Edina H.; Simijonović, Dušica M.; Nakarada, Đura; Jakovljević, Vladimir; Vojinović, Radiša; Marković, Zoran S.
Mechanism of Antiradical Activity of Coumarin-Trihydroxybenzohydrazide Derivatives: A Comprehensive Kinetic DFT Study Journal Article
In: vol. 13, no. 2, 2024.
@article{Milanović2024,
title = {Mechanism of Antiradical Activity of Coumarin-Trihydroxybenzohydrazide Derivatives: A Comprehensive Kinetic DFT Study},
author = {Žiko Milanović and Dušan Dimić and Edina H. Avdović and Dušica M. Simijonović and Đura Nakarada and Vladimir Jakovljević and Radiša Vojinović and Zoran S. Marković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85187258968&doi=10.3390%2fantiox13020143&partnerID=40&md5=3dfd5910afa12c2c7fbc1ead97dd619e},
doi = {10.3390/antiox13020143},
year = {2024},
date = {2024-01-01},
volume = {13},
number = {2},
abstract = {As part of this study, the mechanisms of the antioxidant activity of previously synthesized coumarin–trihydrobenzohydrazine derivatives were investigated: (E)-2,4-dioxo-3-(1-(2-(2″,3″,4″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (1) and (E)-2,4-dioxo-3-(1-(2-(3″,4″,5″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (2). The capacity of the compounds to neutralize HO• was assessed by EPR spectroscopy. The standard mechanisms of antioxidant action, Hydrogen Atom Transfer (HAT), Sequential Proton Loss followed by Electron Transfer (SPLET), Single-Electron Transfer followed by Proton Transfer (SET-PT), and Radical Adduct/Coupling Formation (RAF/RCF) were examined using the QM-ORSA methodology. It was estimated that the newly synthesized compounds, under physiological conditions, exhibited antiradical activity via SPLET and RCF mechanisms. Based on the estimated overall rate constants (koverall), it can be concluded that 2 exhibited a greater antiradical capacity. The obtained values indicated a good correlation with the EPR spectroscopy results. Both compounds exhibit approximately 1.5 times more activity in comparison to the precursor compound used in the synthesis (gallic acid). © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
As part of this study, the mechanisms of the antioxidant activity of previously synthesized coumarin–trihydrobenzohydrazine derivatives were investigated: (E)-2,4-dioxo-3-(1-(2-(2″,3″,4″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (1) and (E)-2,4-dioxo-3-(1-(2-(3″,4″,5″-trihydroxybenzoyl)hydrazineyl)ethylidene)chroman-7-yl acetate (2). The capacity of the compounds to neutralize HO• was assessed by EPR spectroscopy. The standard mechanisms of antioxidant action, Hydrogen Atom Transfer (HAT), Sequential Proton Loss followed by Electron Transfer (SPLET), Single-Electron Transfer followed by Proton Transfer (SET-PT), and Radical Adduct/Coupling Formation (RAF/RCF) were examined using the QM-ORSA methodology. It was estimated that the newly synthesized compounds, under physiological conditions, exhibited antiradical activity via SPLET and RCF mechanisms. Based on the estimated overall rate constants (koverall), it can be concluded that 2 exhibited a greater antiradical capacity. The obtained values indicated a good correlation with the EPR spectroscopy results. Both compounds exhibit approximately 1.5 times more activity in comparison to the precursor compound used in the synthesis (gallic acid). © 2024 by the authors.
Gandara, Meriene; Arruda, Milena Nakagawa; Assis, João Marcos Kruszynski; de Jesus Oliveira Martins, Marta; Rakočević, Lazar; Mladenović, Dušan; Šljukić, Biljana; Gonçalves, Emerson Sarmento
Nb-MXene as promising material for electrocatalysis in energy conversion (OER/ORR) and storage Journal Article
In: vol. 40, 2024.
@article{Gandara2024,
title = {Nb-MXene as promising material for electrocatalysis in energy conversion (OER/ORR) and storage},
author = {Meriene Gandara and Milena Nakagawa Arruda and João Marcos Kruszynski Assis and Marta de Jesus Oliveira Martins and Lazar Rakočević and Dušan Mladenović and Biljana Šljukić and Emerson Sarmento Gonçalves},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85199948753&doi=10.1016%2fj.apmt.2024.102356&partnerID=40&md5=c67523d7da5f5c8bcd7dc6b1a3b43293},
doi = {10.1016/j.apmt.2024.102356},
year = {2024},
date = {2024-01-01},
volume = {40},
abstract = {Low-cost non-noble metal electrocatalysts are currently the focus of research and development for energy conversion and storage devices. MXenes, the newest class of two-dimensional materials, have high surface area, nanometer layer thickness, hydrophilicity and high electrical conductivity that favor their performance for electrocatalytic reactions. Herein, niobium carbide MXene (Nb-MXene) was obtained from its MAX phase by chemical synthesis and characterized regarding its morphology, structure and electrochemical activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) as well as for charge storage in different electrolytic media. The results demonstrate the good performance of Nb-MXene for storing charge (104 F g−1 at 5 mV s−1) that increased remarkably with continuous cycling in an acidic medium. Current density for oxygen evolution of ∼32.5 mA cm−2 was reached in alkaline medium. The oxygen reduction reaction in the same media was observed to proceed via 2e− mechanism with a Tafel slope of 114 mV dec−1. Therefore, Nb-MXene presents characteristics and performance of a promising material for electrocatalytic reactions. © 2024},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Low-cost non-noble metal electrocatalysts are currently the focus of research and development for energy conversion and storage devices. MXenes, the newest class of two-dimensional materials, have high surface area, nanometer layer thickness, hydrophilicity and high electrical conductivity that favor their performance for electrocatalytic reactions. Herein, niobium carbide MXene (Nb-MXene) was obtained from its MAX phase by chemical synthesis and characterized regarding its morphology, structure and electrochemical activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) as well as for charge storage in different electrolytic media. The results demonstrate the good performance of Nb-MXene for storing charge (104 F g−1 at 5 mV s−1) that increased remarkably with continuous cycling in an acidic medium. Current density for oxygen evolution of ∼32.5 mA cm−2 was reached in alkaline medium. The oxygen reduction reaction in the same media was observed to proceed via 2e− mechanism with a Tafel slope of 114 mV dec−1. Therefore, Nb-MXene presents characteristics and performance of a promising material for electrocatalytic reactions. © 2024
Vićentić, T.; Greco, I.; Iorio, C. S.; Mišković, V.; Bajuk-Bogdanović, D.; Pašti, I. A.; Radulović, K.; Klenk, S.; Stimpel-Lindner, T.; Duesberg, G. S.; Spasenović, M.
Laser-induced graphene on cross-linked sodium alginate Journal Article
In: vol. 35, no. 11, 2024.
@article{Vićentić2024,
title = {Laser-induced graphene on cross-linked sodium alginate},
author = {T. Vićentić and I. Greco and C. S. Iorio and V. Mišković and D. Bajuk-Bogdanović and I. A. Pašti and K. Radulović and S. Klenk and T. Stimpel-Lindner and G. S. Duesberg and M. Spasenović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85181395405&doi=10.1088%2f1361-6528%2fad143a&partnerID=40&md5=774936471acc9f82cf448c0faebe90d5},
doi = {10.1088/1361-6528/ad143a},
year = {2024},
date = {2024-01-01},
volume = {35},
number = {11},
abstract = {Laser-induced graphene (LIG) possesses desirable properties for numerous applications. However, LIG formation on biocompatible substrates is needed to further augment the integration of LIG-based technologies into nanobiotechnology. Here, LIG formation on crosslinked sodium alginate is reported. The LIG is systematically investigated, providing a comprehensive understanding of the physicochemical characteristics of the material. Raman spectroscopy, scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy techniques confirm the successful generation of oxidized graphene on the surface of cross-linked sodium alginate. The influence of laser parameters and the amount of crosslinker incorporated into the alginate substrate is explored, revealing that lower laser speed, higher resolution, and increased CaCl2 content leads to LIG with lower electrical resistance. These findings could have significant implications for the fabrication of LIG on alginate with tailored conductive properties, but they could also play a guiding role for LIG formation on other biocompatible substrates. © 2024 Institute of Physics Publishing. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Laser-induced graphene (LIG) possesses desirable properties for numerous applications. However, LIG formation on biocompatible substrates is needed to further augment the integration of LIG-based technologies into nanobiotechnology. Here, LIG formation on crosslinked sodium alginate is reported. The LIG is systematically investigated, providing a comprehensive understanding of the physicochemical characteristics of the material. Raman spectroscopy, scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy techniques confirm the successful generation of oxidized graphene on the surface of cross-linked sodium alginate. The influence of laser parameters and the amount of crosslinker incorporated into the alginate substrate is explored, revealing that lower laser speed, higher resolution, and increased CaCl2 content leads to LIG with lower electrical resistance. These findings could have significant implications for the fabrication of LIG on alginate with tailored conductive properties, but they could also play a guiding role for LIG formation on other biocompatible substrates. © 2024 Institute of Physics Publishing. All rights reserved.
Vujković, Milica; Popović, Maja; Čebela, Maria; Jugović, Dragana
Heavily vanadium-doped LiFePO4 olivine as electrode material for Li-ion aqueous rechargeable batteries Journal Article
In: vol. 11, no. 5, 2024.
@article{Vujković2024,
title = {Heavily vanadium-doped LiFePO4 olivine as electrode material for Li-ion aqueous rechargeable batteries},
author = {Milica Vujković and Maja Popović and Maria Čebela and Dragana Jugović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85192959763&doi=10.1088%2f2053-1591%2fad3463&partnerID=40&md5=a91598a29d1c4a84ffae8d8a4413dfc0},
doi = {10.1088/2053-1591/ad3463},
year = {2024},
date = {2024-01-01},
volume = {11},
number = {5},
abstract = {Since LiFePO4 batteries play a major role in the transition to safe, more affordable and sustainable energy production, numerous strategies have been applied to modify LFP cathode, with the aim of improving its electrochemistry. In this contribution, a highly vanadium-doped LiFe0.9V0.1PO4/C composite (LFP/C-10V) is synthesized using the glycine combustion method and characterized by x-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetry Differential Thermal Analysis (TGDTA) and Cyclic Voltammetry (CV). It is shown that 10wt.% of vanadium can substitute Fe positions, thus decreasing unit cell volume, which is followed by generation of Li3V2PO4 traces, as detected by CV. High vanadium doping does not change the carbon content in the composite (≈13 wt%) but improves its electronic conductivity and electrochemical performance in both aqueous and organic electrolytes. The reversibility and current response are increasing following the trend: LFP/C, LFP/C -3mol%V, LFP/C - 5 mol % and LFP/C-10 mol %. The best specific capacity is obtained for the most highly doped olivine, which exhibits a reversible process at 1 mV s−1 in an aqueous electrolyte, thus showing a peak-to-peak distance of 56 mV. The high capacity of LFPC-10V is measured in both LiNO3 and NaNO3 electrolytes amounting to around 100 mAh g−1 at 20 mV s−1. Still, the material is only stable in LiNO3 electrolyte, making it more suitable for Li than Na-ion aqueous rechargeable batteries. © 2024 The Author(s). Published by IOP Publishing Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Since LiFePO4 batteries play a major role in the transition to safe, more affordable and sustainable energy production, numerous strategies have been applied to modify LFP cathode, with the aim of improving its electrochemistry. In this contribution, a highly vanadium-doped LiFe0.9V0.1PO4/C composite (LFP/C-10V) is synthesized using the glycine combustion method and characterized by x-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetry Differential Thermal Analysis (TGDTA) and Cyclic Voltammetry (CV). It is shown that 10wt.% of vanadium can substitute Fe positions, thus decreasing unit cell volume, which is followed by generation of Li3V2PO4 traces, as detected by CV. High vanadium doping does not change the carbon content in the composite (≈13 wt%) but improves its electronic conductivity and electrochemical performance in both aqueous and organic electrolytes. The reversibility and current response are increasing following the trend: LFP/C, LFP/C -3mol%V, LFP/C - 5 mol % and LFP/C-10 mol %. The best specific capacity is obtained for the most highly doped olivine, which exhibits a reversible process at 1 mV s−1 in an aqueous electrolyte, thus showing a peak-to-peak distance of 56 mV. The high capacity of LFPC-10V is measured in both LiNO3 and NaNO3 electrolytes amounting to around 100 mAh g−1 at 20 mV s−1. Still, the material is only stable in LiNO3 electrolyte, making it more suitable for Li than Na-ion aqueous rechargeable batteries. © 2024 The Author(s). Published by IOP Publishing Ltd.
Kordić, Branko; Dimić, Dušan; Despotović, Vesna; Jović, Branislav
In: vol. 399, 2024.
@article{Kordić2024,
title = {Spectroscopic and theoretical investigation of solvent effect on N–H∙∙∙O, N–H∙∙∙N and N–H∙∙∙π interactions in complexes of N-monosubstituted benzamides},
author = {Branko Kordić and Dušan Dimić and Vesna Despotović and Branislav Jović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188738887&doi=10.1016%2fj.molliq.2024.124472&partnerID=40&md5=d29fd6321169dd76301e5d58758a1ce1},
doi = {10.1016/j.molliq.2024.124472},
year = {2024},
date = {2024-01-01},
volume = {399},
abstract = {In this research, experimental and theoretical spectral analysis of N-monosubstituted benzamides was performed by mid-infrared spectroscopy and density functional theory. The MIR spectroscopic characteristics for N–H∙∙∙O, N–H∙∙∙N and N–H∙∙∙π hydrogen-bonded complexes and also the equilibrium constants for 1:1 complex formation are given. The structures of selected N-substituted benzamides (as proton donors), benzene, acetonitrile, and tetrahydrofuran (as proton acceptors), as well as their complexes, were optimised at the M06-2X/6–311++G(d,p) level of theory. The solvent effect on hydrogen-bonded complexes and the correlations between the equilibrium constants and molecular descriptors of N-monosubstituted benzamides were also investigated using a principal component analysis. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this research, experimental and theoretical spectral analysis of N-monosubstituted benzamides was performed by mid-infrared spectroscopy and density functional theory. The MIR spectroscopic characteristics for N–H∙∙∙O, N–H∙∙∙N and N–H∙∙∙π hydrogen-bonded complexes and also the equilibrium constants for 1:1 complex formation are given. The structures of selected N-substituted benzamides (as proton donors), benzene, acetonitrile, and tetrahydrofuran (as proton acceptors), as well as their complexes, were optimised at the M06-2X/6–311++G(d,p) level of theory. The solvent effect on hydrogen-bonded complexes and the correlations between the equilibrium constants and molecular descriptors of N-monosubstituted benzamides were also investigated using a principal component analysis. © 2024 Elsevier B.V.
Polić, Suzana; Ristić, Slavica; Radojković, Bojana; Bajuk-Bogdanović, Danica
Corroded medieval iron nail from the Studenica Monastery - Material analysis and laser cleaning Journal Article
In: vol. 66, pp. 367 – 374, 2024.
@article{Polić2024367,
title = {Corroded medieval iron nail from the Studenica Monastery - Material analysis and laser cleaning},
author = {Suzana Polić and Slavica Ristić and Bojana Radojković and Danica Bajuk-Bogdanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85182143489&doi=10.1016%2fj.culher.2023.12.012&partnerID=40&md5=70ec1afed04420ce85010a6521936fbc},
doi = {10.1016/j.culher.2023.12.012},
year = {2024},
date = {2024-01-01},
volume = {66},
pages = {367 – 374},
abstract = {In this paper, the state of an archaeological artefact (iron nail) originating from the Studenica Monastery (Serbia) has been presented as well as the possibility of laser cleaning its corrosion layers. To determine the presence of cracks and other defects in the sample, the digital radiographic method was used. The composition of the artefact was analysed by X-ray Fluorescence Spectrometry (XRF) and energy-dispersive X-ray Spectroscopy (EDX). The corrosion products were investigated by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman Spectroscopy, and EDX microanalysis. The Nd:YAG laser was used for corrosion cleaning. The morphological modification of the surfaces cleaned by laser was analysed with optical and scanning electron microscopy (SEM). The test results showed that the cleaning of thick corrosion deposits with a laser is difficult and very expensive. Therefore, it is necessary to combine mechanical or chemical methods with lasers. © 2023 Consiglio Nazionale delle Ricerche (CNR)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, the state of an archaeological artefact (iron nail) originating from the Studenica Monastery (Serbia) has been presented as well as the possibility of laser cleaning its corrosion layers. To determine the presence of cracks and other defects in the sample, the digital radiographic method was used. The composition of the artefact was analysed by X-ray Fluorescence Spectrometry (XRF) and energy-dispersive X-ray Spectroscopy (EDX). The corrosion products were investigated by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Raman Spectroscopy, and EDX microanalysis. The Nd:YAG laser was used for corrosion cleaning. The morphological modification of the surfaces cleaned by laser was analysed with optical and scanning electron microscopy (SEM). The test results showed that the cleaning of thick corrosion deposits with a laser is difficult and very expensive. Therefore, it is necessary to combine mechanical or chemical methods with lasers. © 2023 Consiglio Nazionale delle Ricerche (CNR)
Georgijević, Jelena; Milikić, Jadranka; Aykut, Yasemin; Zdolšek, Nikola; Santos, Diogo M. F.; Bayrakçeken, Ayşe; Šljukić, Biljana
Fe, Cu-decorated carbon material produced from ionic liquids as resourceful electrocatalyst for water splitting Journal Article
In: vol. 967, 2024.
@article{Georgijević2024,
title = {Fe, Cu-decorated carbon material produced from ionic liquids as resourceful electrocatalyst for water splitting},
author = {Jelena Georgijević and Jadranka Milikić and Yasemin Aykut and Nikola Zdolšek and Diogo M. F. Santos and Ayşe Bayrakçeken and Biljana Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85196621637&doi=10.1016%2fj.jelechem.2024.118455&partnerID=40&md5=5ea46bf6cba07b186c66053645399545},
doi = {10.1016/j.jelechem.2024.118455},
year = {2024},
date = {2024-01-01},
volume = {967},
abstract = {The quest for highly efficient, stable, and economically viable bifunctional electrocatalysts is of paramount relevance for advancing in water splitting for the hydrogen energy sector, particularly in facilitating hydrogen (HER) and oxygen evolution evolution (OER) as cathodic and anodic reaction, respectively. In this study, two ionic liquids containing transition metal Fe or Cu, as well as a mixture of these ionic liquids, were used as precursors to synthesize Fe-, Cu-, and Fe,Cu-decorated carbon materials through simple, straightforward, and inexpensive carbonization processes. Comprehensive characterization via SEM-EDS, TEM, XRD, and XPS established the formation of Fe3O4 and Cu2O species. These materials were systematically evaluated for OER and HER in alkaline electrolyte. Fe,Cu-decorated carbon electrocatalyst exhibited favorable performance for OER, including a low onset potential, and reaching 10 and 50 mA cm−2 at overpotential values of 325 mV and 364 mV, respectively. Notably, grafting both Fe and Cu in the material further augmented its electrocatalytic properties, underscoring the enhanced potential of transition metal-decorated carbon materials for OER applications. © 2024 The Author(s)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The quest for highly efficient, stable, and economically viable bifunctional electrocatalysts is of paramount relevance for advancing in water splitting for the hydrogen energy sector, particularly in facilitating hydrogen (HER) and oxygen evolution evolution (OER) as cathodic and anodic reaction, respectively. In this study, two ionic liquids containing transition metal Fe or Cu, as well as a mixture of these ionic liquids, were used as precursors to synthesize Fe-, Cu-, and Fe,Cu-decorated carbon materials through simple, straightforward, and inexpensive carbonization processes. Comprehensive characterization via SEM-EDS, TEM, XRD, and XPS established the formation of Fe3O4 and Cu2O species. These materials were systematically evaluated for OER and HER in alkaline electrolyte. Fe,Cu-decorated carbon electrocatalyst exhibited favorable performance for OER, including a low onset potential, and reaching 10 and 50 mA cm−2 at overpotential values of 325 mV and 364 mV, respectively. Notably, grafting both Fe and Cu in the material further augmented its electrocatalytic properties, underscoring the enhanced potential of transition metal-decorated carbon materials for OER applications. © 2024 The Author(s)
Latas, Nemanja; Pjević, Dejan; Rajić, Vladimir; Ivanović, Milutin; Jugović, Dragana; Stojadinović, Stevan; Cvjetićanin, Nikola
Enhancing electrical and optical properties of anatase TiO2 nanotubes through electrochemical lithiation Journal Article
In: vol. 1005, 2024.
@article{Latas2024,
title = {Enhancing electrical and optical properties of anatase TiO2 nanotubes through electrochemical lithiation},
author = {Nemanja Latas and Dejan Pjević and Vladimir Rajić and Milutin Ivanović and Dragana Jugović and Stevan Stojadinović and Nikola Cvjetićanin},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201671353&doi=10.1016%2fj.jallcom.2024.176081&partnerID=40&md5=84a332fa5c88e6cb5f67fb46ac805842},
doi = {10.1016/j.jallcom.2024.176081},
year = {2024},
date = {2024-01-01},
volume = {1005},
abstract = {In presented paper, anatase TiO2 nanotubes (NTs) were obtained by anodic oxidation of Ti-foil followed by subsequent annealing in air at 400 °C. After thermal treatment, TiO2 nanotubes (NTs) were electrochemically lithiated by means of galvanostatic (GS) discharge, as a part of GS cycling, at 25°C and 55 °C. Microstructural properties of the as-prepared material were observed by scanning and transmission electron microscopy (SEM, TEM), while changes in chemical bonding with lithiation were examined by X-ray photoelectron spectroscopy (XPS). Specific electrical conductivity, obtained by 4-point probe method, showed multifold increase after Li-ion insertion in TiO2 NTs, at both temperatures. By using diffuse reflectance spectroscopy (DRS), the decrease in energy gap, from 3.04 eV for the as-prepared TiO2 NTs to 2.81 eV for lithiated TiO2 NTs, was observed. The photoluminescence (PL) measurements suggest that Li-ion intercalation led to suppression of deep-level trap states within the bandgap, of TiO2 NTs, and promoted shallow defects associated to F-centers. Open-circuit photovoltage decay (OCVD) measurements confirm the promotion of shallow defect states. Furthermore, HER measurements indicate that the electrochemical lithiation is a promising strategy for enhancing the catalytic performance of TiO2. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In presented paper, anatase TiO2 nanotubes (NTs) were obtained by anodic oxidation of Ti-foil followed by subsequent annealing in air at 400 °C. After thermal treatment, TiO2 nanotubes (NTs) were electrochemically lithiated by means of galvanostatic (GS) discharge, as a part of GS cycling, at 25°C and 55 °C. Microstructural properties of the as-prepared material were observed by scanning and transmission electron microscopy (SEM, TEM), while changes in chemical bonding with lithiation were examined by X-ray photoelectron spectroscopy (XPS). Specific electrical conductivity, obtained by 4-point probe method, showed multifold increase after Li-ion insertion in TiO2 NTs, at both temperatures. By using diffuse reflectance spectroscopy (DRS), the decrease in energy gap, from 3.04 eV for the as-prepared TiO2 NTs to 2.81 eV for lithiated TiO2 NTs, was observed. The photoluminescence (PL) measurements suggest that Li-ion intercalation led to suppression of deep-level trap states within the bandgap, of TiO2 NTs, and promoted shallow defects associated to F-centers. Open-circuit photovoltage decay (OCVD) measurements confirm the promotion of shallow defect states. Furthermore, HER measurements indicate that the electrochemical lithiation is a promising strategy for enhancing the catalytic performance of TiO2. © 2024 Elsevier B.V.
Obradović, Milena; Daković, Aleksandra; Smiljanić, Danijela; Marković, Marija; Ožegović, Milica; Krstić, Jugoslav; Vuković, Nikola; Milojević-Rakić, Maja
Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs Journal Article
In: vol. 12, no. 1, 2024.
@article{Obradović2024,
title = {Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs},
author = {Milena Obradović and Aleksandra Daković and Danijela Smiljanić and Marija Marković and Milica Ožegović and Jugoslav Krstić and Nikola Vuković and Maja Milojević-Rakić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85183378630&doi=10.3390%2fpr12010096&partnerID=40&md5=668340d679e06d556e0ba6a3eac0340f},
doi = {10.3390/pr12010096},
year = {2024},
date = {2024-01-01},
volume = {12},
number = {1},
abstract = {Organobentonites have been applied for the removal of two common non-steroidal anti-inflammatory drugs, ibuprofen (IBU) and diclofenac sodium (DS), from aqueous solutions. Two surfactants, one with and the other without benzyl group (octadecyldimethylbenzylammonium chloride, ODMBA, and hexadecyltrimethylammonium bromide, HDTMA), in amounts equivalent to 50, 75, and 100% of the cation exchange capacity of bentonite were used for the preparation of organobentonites. Successful modification of bentonite was confirmed by several methods: X-ray powder diffraction (XRPD), point of the zero charge (pHPZC), determination of exchanged inorganic cations in bentonite, determination of textural properties, and scanning electron microscopy (SEM). Kinetic and thermodynamic data on the adsorption of IBU and DS showed that drug adsorption was controlled by the type and the amount of surfactant incorporated into the bentonite and by their arrangement in the interlayer space and at the surface of organobentonites. The adsorption of both drugs increased with an increase in the amount of both surfactants in organobentonites. The presence of the benzyl group in organobentonites enhanced the adsorption of IBU and DS and was more pronounced for IBU. Drug adsorption fits the pseudo-second-order kinetic model the best. The thermodynamic data revealed that the adsorption process was endothermic in nature and with increase of the amount of both surfactants drug adsorption processes were more spontaneous. The results obtained from this study revealed that adsorbents based on surfactants modified bentonite are promising candidates for IBU and DS removal from contaminated water. © 2023 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Organobentonites have been applied for the removal of two common non-steroidal anti-inflammatory drugs, ibuprofen (IBU) and diclofenac sodium (DS), from aqueous solutions. Two surfactants, one with and the other without benzyl group (octadecyldimethylbenzylammonium chloride, ODMBA, and hexadecyltrimethylammonium bromide, HDTMA), in amounts equivalent to 50, 75, and 100% of the cation exchange capacity of bentonite were used for the preparation of organobentonites. Successful modification of bentonite was confirmed by several methods: X-ray powder diffraction (XRPD), point of the zero charge (pHPZC), determination of exchanged inorganic cations in bentonite, determination of textural properties, and scanning electron microscopy (SEM). Kinetic and thermodynamic data on the adsorption of IBU and DS showed that drug adsorption was controlled by the type and the amount of surfactant incorporated into the bentonite and by their arrangement in the interlayer space and at the surface of organobentonites. The adsorption of both drugs increased with an increase in the amount of both surfactants in organobentonites. The presence of the benzyl group in organobentonites enhanced the adsorption of IBU and DS and was more pronounced for IBU. Drug adsorption fits the pseudo-second-order kinetic model the best. The thermodynamic data revealed that the adsorption process was endothermic in nature and with increase of the amount of both surfactants drug adsorption processes were more spontaneous. The results obtained from this study revealed that adsorbents based on surfactants modified bentonite are promising candidates for IBU and DS removal from contaminated water. © 2023 by the authors.
Al-Hamry, Ammar; Pan, Yang; Rahaman, Mahfujur; Selyshchev, Oleksandr; Tegenkamp, Christoph; Zahn, Dietrich R. T.; Pašti, Igor A.; Kanoun, Olfa
Toward Humidity-Independent Sensitive and Fast Response Temperature Sensors Based on Reduced Graphene Oxide/Poly(vinyl alcohol) Nanocomposites Journal Article
In: vol. 6, no. 6, pp. 4718 – 4734, 2024.
@article{Al-Hamry20244718,
title = {Toward Humidity-Independent Sensitive and Fast Response Temperature Sensors Based on Reduced Graphene Oxide/Poly(vinyl alcohol) Nanocomposites},
author = {Ammar Al-Hamry and Yang Pan and Mahfujur Rahaman and Oleksandr Selyshchev and Christoph Tegenkamp and Dietrich R. T. Zahn and Igor A. Pašti and Olfa Kanoun},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85194955422&doi=10.1021%2facsaelm.4c00729&partnerID=40&md5=794b43cc43d83c68c2425cc6d23dbf9c},
doi = {10.1021/acsaelm.4c00729},
year = {2024},
date = {2024-01-01},
volume = {6},
number = {6},
pages = {4718 – 4734},
abstract = {Flexible temperature sensors are becoming increasingly important these days. In this work, we explore graphene oxide (GO)/poly(vinyl alcohol) (PVA) nanocomposites for potential application in temperature sensors. The influence of the mixing ratio of both materials, the reduction temperature, and passivation on the sensing performance has been investigated. Various spectroscopic techniques revealed the composite structure and atomic composition. These were complemented by semiempirical quantum chemical calculations to investigate rGO and PVA interaction. Scanning electron and atomic force microscopy measurements were carried out to evaluate dispersion and coated film quality. The temperature sensitivity has been evaluated for several composite materials with different compositions in the range from 10 to 80 °C. The results show that a linear temperature behavior can be realized based on rGO/PVA composites with temperature coefficients of resistance (TCR) larger than 1.8% K-1 and a fast response time of 0.3 s with minimal hysteresis. Furthermore, humidity influence has been investigated in the range from 10% to 80%, and a minor effect is shown. Therefore, we can conclude that rGO/PVA composites have a high potential for excellent passivation-free, humidity-independent, sensitive, and fast response temperature sensors for various applications. The GO reduction is tunable, and PVA improves the rGO/PVA sensor performance by increasing the tunneling effect and band gap energy, consequently improving temperature sensitivity. Additionally, PVA exhibits minimal water absorption, reducing the humidity sensitivity. rGO/PVA maintains its temperature sensitivity during and after several mechanical deformations. © 2024 The Authors. Published by American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Flexible temperature sensors are becoming increasingly important these days. In this work, we explore graphene oxide (GO)/poly(vinyl alcohol) (PVA) nanocomposites for potential application in temperature sensors. The influence of the mixing ratio of both materials, the reduction temperature, and passivation on the sensing performance has been investigated. Various spectroscopic techniques revealed the composite structure and atomic composition. These were complemented by semiempirical quantum chemical calculations to investigate rGO and PVA interaction. Scanning electron and atomic force microscopy measurements were carried out to evaluate dispersion and coated film quality. The temperature sensitivity has been evaluated for several composite materials with different compositions in the range from 10 to 80 °C. The results show that a linear temperature behavior can be realized based on rGO/PVA composites with temperature coefficients of resistance (TCR) larger than 1.8% K-1 and a fast response time of 0.3 s with minimal hysteresis. Furthermore, humidity influence has been investigated in the range from 10% to 80%, and a minor effect is shown. Therefore, we can conclude that rGO/PVA composites have a high potential for excellent passivation-free, humidity-independent, sensitive, and fast response temperature sensors for various applications. The GO reduction is tunable, and PVA improves the rGO/PVA sensor performance by increasing the tunneling effect and band gap energy, consequently improving temperature sensitivity. Additionally, PVA exhibits minimal water absorption, reducing the humidity sensitivity. rGO/PVA maintains its temperature sensitivity during and after several mechanical deformations. © 2024 The Authors. Published by American Chemical Society.
Ležaić, Aleksandra Janošević; Bajuk-Bogdanović, Danica; Ćirić-Marjanović, Gordana
In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity Journal Article
In: vol. 305, 2024.
@article{JanoševićLežaić2024,
title = {In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity},
author = {Aleksandra Janošević Ležaić and Danica Bajuk-Bogdanović and Gordana Ćirić-Marjanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189563065&doi=10.1016%2fj.synthmet.2024.117602&partnerID=40&md5=97d369b09fbb3c19a864525c28d88fa2},
doi = {10.1016/j.synthmet.2024.117602},
year = {2024},
date = {2024-01-01},
volume = {305},
abstract = {In situ Raman spectroscopy was used for the first time to study the reaction intermediates/products of the oxidative polymerization of aniline to polyaniline (PANI) with peroxydisulfate in aqueous solutions of different initial acidity. Raman spectra were recorded for the drops of reaction mixture taken at various reaction times. Five reaction systems with different pH of the monomer solution (pHmon), leading to 1-D nanostructured PANIs (pHmon =5.8, 4.6 and 4.5) and granular PANIs (pHmon= 3.4 and 1.0) were explored. Spectral characteristics of different reaction phases - athermal, exothermic and post-propagation were identified and correlated with the proposed mechanisms of aniline polymerization and nanostructures formation. For the nanostructured PANIs, the athermal phase was characterized by pronounced strengthening of the δ(N−H)/ν(C[dbnd]N)Q band at 1510–1520 cm−1, while the characteristic of the second exothermic phase was the strengthening of the ν(C∼C)B/ν(C∼C)Phz band at c.a. 1636 cm−1 which becomes stronger than the ν(C[dbnd]C)Q/ν(C∼C)SQ band at c.a. 1590 cm–1. For granular PANIs, the band at 1590 cm–1 was stronger than that at 1630 cm–1 for all reaction phases. For all reaction systems, characteristic feature of the post-propagation phase was strengthening of the ν(C∼N+•) band at 1330–1340 cm−1 due to delocalized polarons. For granular PANIs, the band associated with phenazine-like units at c.a. 1415 cm−1 disappeared after the exothermic phase, while for nanostructured PANIs it was seen until the end of the reaction. The obtained results are expected to be useful in further investigations of the intermediates/products and mechanisms of polymerizations of other aromatic amines. © 2024 Elsevier B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In situ Raman spectroscopy was used for the first time to study the reaction intermediates/products of the oxidative polymerization of aniline to polyaniline (PANI) with peroxydisulfate in aqueous solutions of different initial acidity. Raman spectra were recorded for the drops of reaction mixture taken at various reaction times. Five reaction systems with different pH of the monomer solution (pHmon), leading to 1-D nanostructured PANIs (pHmon =5.8, 4.6 and 4.5) and granular PANIs (pHmon= 3.4 and 1.0) were explored. Spectral characteristics of different reaction phases - athermal, exothermic and post-propagation were identified and correlated with the proposed mechanisms of aniline polymerization and nanostructures formation. For the nanostructured PANIs, the athermal phase was characterized by pronounced strengthening of the δ(N−H)/ν(C[dbnd]N)Q band at 1510–1520 cm−1, while the characteristic of the second exothermic phase was the strengthening of the ν(C∼C)B/ν(C∼C)Phz band at c.a. 1636 cm−1 which becomes stronger than the ν(C[dbnd]C)Q/ν(C∼C)SQ band at c.a. 1590 cm–1. For granular PANIs, the band at 1590 cm–1 was stronger than that at 1630 cm–1 for all reaction phases. For all reaction systems, characteristic feature of the post-propagation phase was strengthening of the ν(C∼N+•) band at 1330–1340 cm−1 due to delocalized polarons. For granular PANIs, the band associated with phenazine-like units at c.a. 1415 cm−1 disappeared after the exothermic phase, while for nanostructured PANIs it was seen until the end of the reaction. The obtained results are expected to be useful in further investigations of the intermediates/products and mechanisms of polymerizations of other aromatic amines. © 2024 Elsevier B.V.
Milikić, Jadranka; Gusmão, Filipe; Knežević, Sara; Gavrilov, Nemanja; Paul, Anup; Santos, Diogo M. F.; Šljukić, Biljana
Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis Journal Article
In: vol. 10, no. 6, 2024.
@article{Milikić2024b,
title = {Transition Metal-Based Polyoxometalates for Oxygen Electrode Bifunctional Electrocatalysis},
author = {Jadranka Milikić and Filipe Gusmão and Sara Knežević and Nemanja Gavrilov and Anup Paul and Diogo M. F. Santos and Biljana Šljukić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85197117833&doi=10.3390%2fbatteries10060197&partnerID=40&md5=ea95fac1edbe8f45d73e97fab670606e},
doi = {10.3390/batteries10060197},
year = {2024},
date = {2024-01-01},
volume = {10},
number = {6},
abstract = {Polyoxometalates (POMs) with transition metals (Co, Cu, Fe, Mn, Ni) of Keggin structure and lamellar-stacked multi-layer morphology were synthesized. They were subsequently explored as bifunctional electrocatalysts for oxygen electrodes, i.e., oxygen reduction (ORR) and evolution (OER) reaction, for aqueous rechargeable metal-air batteries in alkaline media. The lowest Tafel slope (85 mV dec−1) value and the highest OER current density of 93.8 mA cm−2 were obtained for the Fe-POM electrocatalyst. Similar OER electrochemical catalytic activity was noticed for the Co-POM electrocatalyst. This behavior was confirmed by electrochemical impedance spectroscopy, where Fe-POM gave the lowest charge transfer resistance of 3.35 Ω, followed by Co-POM with Rct of 15.04 Ω, during the OER. Additionally, Tafel slope values of 85 and 109 mV dec−1 were calculated for Fe-POM and Co-POM, respectively, during the ORR. The ORR at Fe-POM proceeded by mixed two- and four-electron pathways, while ORR at Co-POM proceeded exclusively by the four-electron pathway. Finally, capacitance studies were conducted on the synthesized POMs. © 2024 by the authors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Polyoxometalates (POMs) with transition metals (Co, Cu, Fe, Mn, Ni) of Keggin structure and lamellar-stacked multi-layer morphology were synthesized. They were subsequently explored as bifunctional electrocatalysts for oxygen electrodes, i.e., oxygen reduction (ORR) and evolution (OER) reaction, for aqueous rechargeable metal-air batteries in alkaline media. The lowest Tafel slope (85 mV dec−1) value and the highest OER current density of 93.8 mA cm−2 were obtained for the Fe-POM electrocatalyst. Similar OER electrochemical catalytic activity was noticed for the Co-POM electrocatalyst. This behavior was confirmed by electrochemical impedance spectroscopy, where Fe-POM gave the lowest charge transfer resistance of 3.35 Ω, followed by Co-POM with Rct of 15.04 Ω, during the OER. Additionally, Tafel slope values of 85 and 109 mV dec−1 were calculated for Fe-POM and Co-POM, respectively, during the ORR. The ORR at Fe-POM proceeded by mixed two- and four-electron pathways, while ORR at Co-POM proceeded exclusively by the four-electron pathway. Finally, capacitance studies were conducted on the synthesized POMs. © 2024 by the authors.