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FFH scientific research papers database
FFH database search (1991-2022):
1381.
Etinski, M; Uiberacker, C; Jakubetz, W
Counterdiabatic suppression of background state population in resonance leaking by controlling intermediate branching Journal Article
In: Journal of Chemical Physics, vol. 124, no. 12, 2006.
@article{Etinski2006,
title = {Counterdiabatic suppression of background state population in resonance leaking by controlling intermediate branching},
author = {M Etinski and C Uiberacker and W Jakubetz},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34547649495&doi=10.1063%2f1.2180250&partnerID=40&md5=b7c85e90531395291a42e26b7c29a298},
doi = {10.1063/1.2180250},
year = {2006},
date = {2006-01-01},
journal = {Journal of Chemical Physics},
volume = {124},
number = {12},
abstract = {The counterdiabatic principle [M. Demirplak and S. A. Rice, J. Phys. Chem. A 107, 9937 (2003)] is used in a pragmatic way to formulate a practical control strategy for perturbed population transfer. Interpreting the appearance of population in undesirable intruder or background states as phenomenological consequences of diabatic perturbations, such branching is suppressed as soon as it arises. By invoking a penalty term that is sensitive to any transitional population in undesirable levels, a correction field is created which effectively prevents diabatic behavior. This strategy is applied to the control of background state population in multiphoton excitations. For a model five-level system we show that leaking of a resonant three-photon transition to a background state can readily be suppressed by simple correction fields obtained from our intermediate-branching driven implementation of counterdiabatic control. © 2006 American Institute of Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The counterdiabatic principle [M. Demirplak and S. A. Rice, J. Phys. Chem. A 107, 9937 (2003)] is used in a pragmatic way to formulate a practical control strategy for perturbed population transfer. Interpreting the appearance of population in undesirable intruder or background states as phenomenological consequences of diabatic perturbations, such branching is suppressed as soon as it arises. By invoking a penalty term that is sensitive to any transitional population in undesirable levels, a correction field is created which effectively prevents diabatic behavior. This strategy is applied to the control of background state population in multiphoton excitations. For a model five-level system we show that leaking of a resonant three-photon transition to a background state can readily be suppressed by simple correction fields obtained from our intermediate-branching driven implementation of counterdiabatic control. © 2006 American Institute of Physics.
1382.
Rakić, V; Rac, V; Dondur, V; Auroux, A
Competitive adsorption of N 2 O and CO on CuZSM-5, FeZSM-5, CoZSM-5 and bimetallic forms of ZSM-5 zeolite Journal Article
In: Catalysis Today, vol. 110, no. 3-4, pp. 272-280, 2005.
@article{Rakić2005272,
title = {Competitive adsorption of N 2 O and CO on CuZSM-5, FeZSM-5, CoZSM-5 and bimetallic forms of ZSM-5 zeolite},
author = {V Rakić and V Rac and V Dondur and A Auroux},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27844466727&doi=10.1016%2fj.cattod.2005.09.027&partnerID=40&md5=4ee8d6cdf2714e2576817b0529d8e1fa},
doi = {10.1016/j.cattod.2005.09.027},
year = {2005},
date = {2005-01-01},
journal = {Catalysis Today},
volume = {110},
number = {3-4},
pages = {272-280},
abstract = {The behavior of copper-, iron- and cobalt-exchanged ZSM-5 (Si/Al = 20) and bimetallic forms of the same zeolite was investigated with reference to the adsorption of N 2 O and CO at 303 K. The interactions of both gases with investigated zeolites have been studied using microcalorimetry and infrared spectroscopy. The values of differential heats of adsorption and the amounts of adsorbed gases were determined. Both gases react with the charge-balancing cations as active sites for adsorption. CuZSM-5 shows significantly better performances than FeZSM-5 and CoZSM-5, toward both gases; additionally, nitrous oxide can be chemisorbed on CuZSM-5. Adsorption capabilities of FeZSM-5 and CoZSM-5 are increased with the addition of copper ions. The heats of CO interaction with copper-containing samples have been found to be higher then the heats of N 2 O interaction, while for FeZSM-5 and CoZSM-5 samples similar heats were detected for both gases. In the case of CuZSM-5, as a result of competitive adsorption between previously adsorbed N 2 O and incoming CO from the gas phase, a surface reaction is found. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The behavior of copper-, iron- and cobalt-exchanged ZSM-5 (Si/Al = 20) and bimetallic forms of the same zeolite was investigated with reference to the adsorption of N 2 O and CO at 303 K. The interactions of both gases with investigated zeolites have been studied using microcalorimetry and infrared spectroscopy. The values of differential heats of adsorption and the amounts of adsorbed gases were determined. Both gases react with the charge-balancing cations as active sites for adsorption. CuZSM-5 shows significantly better performances than FeZSM-5 and CoZSM-5, toward both gases; additionally, nitrous oxide can be chemisorbed on CuZSM-5. Adsorption capabilities of FeZSM-5 and CoZSM-5 are increased with the addition of copper ions. The heats of CO interaction with copper-containing samples have been found to be higher then the heats of N 2 O interaction, while for FeZSM-5 and CoZSM-5 samples similar heats were detected for both gases. In the case of CuZSM-5, as a result of competitive adsorption between previously adsorbed N 2 O and incoming CO from the gas phase, a surface reaction is found. © 2005 Elsevier B.V. All rights reserved.
1383.
Radić-Perić, J
Formation of solid TiC from thermal plasma: Thermodynamic consideration Journal Article
In: Materials Science Forum, vol. 494, pp. 303-308, 2005.
@article{Radić-Perić2005303,
title = {Formation of solid TiC from thermal plasma: Thermodynamic consideration},
author = {J Radić-Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248895305&doi=10.4028%2f0-87849-971-7.303&partnerID=40&md5=64aa56f76b66e12fc4ae4aff4c800ae7},
doi = {10.4028/0-87849-971-7.303},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {303-308},
abstract = {The synthesis process of solid TiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixture containing titanium and chlorine (titanium as a reactant is assumed to be in the form of titanium tetrachloride) with argon, hydrogen and carbon (carbon as a reactant is assumed to be in the form of methane). The calculation was performed for the temperature range between 500 and 6000 K and the total pressure in the system of 1 bar. The fact that thermal plasma is plasma in (local) thermodynamic equilibrium made possible the theoretical determination (by employing the Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state) of its equilibrium composition. From the calculated compositions of the investigated gas systems the temperature zones with saturated and/or oversaturated vapor of Ti, TiC and C were determined and the mechanism of the formation of TiC in solid state was proposed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The synthesis process of solid TiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixture containing titanium and chlorine (titanium as a reactant is assumed to be in the form of titanium tetrachloride) with argon, hydrogen and carbon (carbon as a reactant is assumed to be in the form of methane). The calculation was performed for the temperature range between 500 and 6000 K and the total pressure in the system of 1 bar. The fact that thermal plasma is plasma in (local) thermodynamic equilibrium made possible the theoretical determination (by employing the Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state) of its equilibrium composition. From the calculated compositions of the investigated gas systems the temperature zones with saturated and/or oversaturated vapor of Ti, TiC and C were determined and the mechanism of the formation of TiC in solid state was proposed.
1384.
Todorović, T; Andjelković, K; Sladić, D; Jeremić, D; Minić, D
Investigation of thermal stability of Zn(II), Pt(II) and Pd(II) complexes with (E)2-oxo-2-N'-[1-(pyridin-2-yl)ethylidene]hydrazinoacetamide Journal Article
In: Materials Science Forum, vol. 494, pp. 375-380, 2005.
@article{Todorović2005375,
title = {Investigation of thermal stability of Zn(II), Pt(II) and Pd(II) complexes with (E)2-oxo-2-N'-[1-(pyridin-2-yl)ethylidene]hydrazinoacetamide},
author = {T Todorović and K Andjelković and D Sladić and D Jeremić and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248849769&doi=10.4028%2f0-87849-971-7.375&partnerID=40&md5=f8a4188cf451cfc06d9a7d424177d55b},
doi = {10.4028/0-87849-971-7.375},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {375-380},
abstract = {Thermal stability of neutral Zn(II), Pd(II) and Pt(II) complexes of formulae [Zn(apsox)2]·3H2O and [M(apsox)Cl] (M=Pd(II), Pt(II)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal stability of neutral Zn(II), Pd(II) and Pt(II) complexes of formulae [Zn(apsox)2]·3H2O and [M(apsox)Cl] (M=Pd(II), Pt(II)
1385.
Argirusis, Chr.; Damjanović, T; Stojanović, M; Borchardt, G
Synthesis and electrophoretic deposition of an yttrium silicate coating system for oxidation protection of C/C-Si-SiC composites Journal Article
In: Materials Science Forum, vol. 494, pp. 451-456, 2005.
@article{Argirusis2005451,
title = {Synthesis and electrophoretic deposition of an yttrium silicate coating system for oxidation protection of C/C-Si-SiC composites},
author = {Chr. Argirusis and T Damjanović and M Stojanović and G Borchardt},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33750978200&doi=10.4028%2f0-87849-971-7.451&partnerID=40&md5=5f2ed403ac36d732d1ecfabcc5e7d8c9},
doi = {10.4028/0-87849-971-7.451},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {451-456},
abstract = {Due to favorable chemical and mechanical properties of yttrium silicate coatings (low Young's modulus, low thermal expansion coefficient, low evaporation rate and oxygen permeability, good erosion resistance), this material is a promising complement to SiC coatings for protecting C/C-Si-SiC composites. For the preparation of silicate powders, the Pechini method was used. As a coating method, electrophoretic deposition from stable suspensions based on isopropanol was chosen. Under controlled deposition voltage and duration, coatings of various thicknesses were deposited. The deposited layers were characterized by SEM and EDX analysis. The protectiveness of these coatings was tested by isothermal thermogravimetry.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Due to favorable chemical and mechanical properties of yttrium silicate coatings (low Young's modulus, low thermal expansion coefficient, low evaporation rate and oxygen permeability, good erosion resistance), this material is a promising complement to SiC coatings for protecting C/C-Si-SiC composites. For the preparation of silicate powders, the Pechini method was used. As a coating method, electrophoretic deposition from stable suspensions based on isopropanol was chosen. Under controlled deposition voltage and duration, coatings of various thicknesses were deposited. The deposited layers were characterized by SEM and EDX analysis. The protectiveness of these coatings was tested by isothermal thermogravimetry.
1386.
Parac, M; Etinski, M; Peric, M; Grimme, S
A theoretical investigation of the geometries and binding energies of molecular tweezer and clip host-guest systems Journal Article
In: Journal of Chemical Theory and Computation, vol. 1, no. 6, pp. 1110-1118, 2005.
@article{Parac20051110,
title = {A theoretical investigation of the geometries and binding energies of molecular tweezer and clip host-guest systems},
author = {M Parac and M Etinski and M Peric and S Grimme},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33748762575&doi=10.1021%2fct050122n&partnerID=40&md5=fd25f3330d0f3264d498833460757fdb},
doi = {10.1021/ct050122n},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Theory and Computation},
volume = {1},
number = {6},
pages = {1110-1118},
abstract = {A quantum chemical study of host-guest systems with dimethylene-bridged clips and tetramethylene-bridged tweezers as host molecules and six different aliphatic and aromatic substrates as guests is presented. The geometries and binding energies of the complexes are investigated using the recently developed density functional theory with empirical corrections for dispersion interactions (DFT-D) in combination with the BLYP functional and basis sets of TZVP quality. It is found that the DFT-D method provides accurate geometries for the host-guest complexes that compare very favorably to experimental X-ray data. Without the dispersion correction, all host-guest complexes are unbound at the pure DFT level. Calculations of the clip complexes show that the DFT-D binding energies of the guests agree well with those from a more sophisticated SCS-MP2/aug-cc-pVTZ treatment. By a partitioning of the host into molecular fragments it is shown that the binding energy is clearly dominated by the aromatic units of the clip. An energy decomposition analysis of the interaction energies of some tweezer complexes revealed the decisive role of the electrostatic and dispersion contributions for relative stabilities. The calculations on the tweezer complexes show that the benzene spaced tweezer is a better receptor for aliphatic substrates than its naphthalene analogue that has a better topology for the binding of aromatic substrates. The tweezer with a OAc substituent in the central spacer unit is found to favor complex formation with both aliphatic and aromatic substrates. The theoretical results are qualitatively in very good agreement with previous experimental findings although direct comparison with experimental binding energies which include solvent effects is not possible. The good results obtained with the DFT-D-BLYP method suggest this approach as a standard tool in supramolecular chemistry and as the method of choice for theoretical structure determinations of large complexes where both electrostatic and dispersive interactions are crucial. © 2005 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A quantum chemical study of host-guest systems with dimethylene-bridged clips and tetramethylene-bridged tweezers as host molecules and six different aliphatic and aromatic substrates as guests is presented. The geometries and binding energies of the complexes are investigated using the recently developed density functional theory with empirical corrections for dispersion interactions (DFT-D) in combination with the BLYP functional and basis sets of TZVP quality. It is found that the DFT-D method provides accurate geometries for the host-guest complexes that compare very favorably to experimental X-ray data. Without the dispersion correction, all host-guest complexes are unbound at the pure DFT level. Calculations of the clip complexes show that the DFT-D binding energies of the guests agree well with those from a more sophisticated SCS-MP2/aug-cc-pVTZ treatment. By a partitioning of the host into molecular fragments it is shown that the binding energy is clearly dominated by the aromatic units of the clip. An energy decomposition analysis of the interaction energies of some tweezer complexes revealed the decisive role of the electrostatic and dispersion contributions for relative stabilities. The calculations on the tweezer complexes show that the benzene spaced tweezer is a better receptor for aliphatic substrates than its naphthalene analogue that has a better topology for the binding of aromatic substrates. The tweezer with a OAc substituent in the central spacer unit is found to favor complex formation with both aliphatic and aromatic substrates. The theoretical results are qualitatively in very good agreement with previous experimental findings although direct comparison with experimental binding energies which include solvent effects is not possible. The good results obtained with the DFT-D-BLYP method suggest this approach as a standard tool in supramolecular chemistry and as the method of choice for theoretical structure determinations of large complexes where both electrostatic and dispersive interactions are crucial. © 2005 American Chemical Society.
1387.
Jokanović, V; Mioč, U B; Nedić, Z P
Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis Journal Article
In: Solid State Ionics, vol. 176, no. 39-40, pp. 2955-2956, 2005.
@article{Jokanović20052955,
title = {Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis},
author = {V Jokanović and U B Mioč and Z P Nedić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28844440390&doi=10.1016%2fj.ssi.2005.09.029&partnerID=40&md5=d66d0f893bd4912dae3de7337e8b4f0b},
doi = {10.1016/j.ssi.2005.09.029},
year = {2005},
date = {2005-01-01},
journal = {Solid State Ionics},
volume = {176},
number = {39-40},
pages = {2955-2956},
abstract = {Ultrasonic spray pyrolysis has been used to obtain fine spherical powders of WPA bronzes from a 29-tungstenphosphoric acid (WPA-29) feed solution. The average grain size of the obtained powder particles is ca. 1000 nm; these consist of subparticles in the 30-80 nm range. The experimentally determined average WPA bronze particle size values are compared with theoretically calculated ones; fairly good agreement between them is found. It is also shown that the average grain size and grain size distribution of the structure and substructure of the obtained powder are predictable. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ultrasonic spray pyrolysis has been used to obtain fine spherical powders of WPA bronzes from a 29-tungstenphosphoric acid (WPA-29) feed solution. The average grain size of the obtained powder particles is ca. 1000 nm; these consist of subparticles in the 30-80 nm range. The experimentally determined average WPA bronze particle size values are compared with theoretically calculated ones; fairly good agreement between them is found. It is also shown that the average grain size and grain size distribution of the structure and substructure of the obtained powder are predictable. © 2005 Elsevier B.V. All rights reserved.
1388.
Janković, B; Adnadević, B; Jovanović, J; Minić, D; Kolar-Anić, Lj.
Thermogravimetric analysis of superabsorbing polyacrylic hydrogel Journal Article
In: Materials Science Forum, vol. 494, pp. 193-198, 2005.
@article{Janković2005193,
title = {Thermogravimetric analysis of superabsorbing polyacrylic hydrogel},
author = {B Janković and B Adnadević and J Jovanović and D Minić and Lj. Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33845908013&doi=10.4028%2f0-87849-971-7.193&partnerID=40&md5=3314b6afbcf0d98abfc50cf946b52156},
doi = {10.4028/0-87849-971-7.193},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {193-198},
abstract = {The thermogravimetric analysis of superabsorbing polyacrylic hydrogel dehydration, performed under non-isothermal conditions at different heating rates was discussed. Particularly, the influence of the heating rate on the obtained results is given in detail. For this purpose the Weibull distribution function was applied. The thermogravimetric curve when the heating rate tends to zero was evaluated. The activation energy E = 63 kJ/mol, pre-exponential factors = 2.97 × 108 min-1, and rate constant k = 2.76 × 10-3 min-1 were determined on the basis of this curve.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The thermogravimetric analysis of superabsorbing polyacrylic hydrogel dehydration, performed under non-isothermal conditions at different heating rates was discussed. Particularly, the influence of the heating rate on the obtained results is given in detail. For this purpose the Weibull distribution function was applied. The thermogravimetric curve when the heating rate tends to zero was evaluated. The activation energy E = 63 kJ/mol, pre-exponential factors = 2.97 × 108 min-1, and rate constant k = 2.76 × 10-3 min-1 were determined on the basis of this curve.
1389.
Milošević, M; Pejić, N; Čupić, Ž; Anić, S; Kolar-Anić, Lj.
Examinations of cross-linked polyvinylpyridine in open reactor Journal Article
In: Materials Science Forum, vol. 494, pp. 369-374, 2005.
@article{Milošević2005369,
title = {Examinations of cross-linked polyvinylpyridine in open reactor},
author = {M Milošević and N Pejić and Ž Čupić and S Anić and Lj. Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248852872&doi=10.4028%2f0-87849-971-7.369&partnerID=40&md5=a925c4f9b46c7684a121e1ef3706562c},
doi = {10.4028/0-87849-971-7.369},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {369-374},
abstract = {Macroporous cross-linked copolymer of 4-vinylpyridine and 25% (4:1) divinylbenzene is analyzed under open conditions, that is in a continuous well-stirred tank reactor (CSTR). With this aim the appropriate bifurcation diagram is found and the behavior of the system with and without polymer in the vicinity of the bifurcation point is used for the polymer examinations. Two different granulations of polymer are considered. Moreover, some physicochemical characteristics of the polymer, such as specific surface area, skeletal and particle density, are determined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Macroporous cross-linked copolymer of 4-vinylpyridine and 25% (4:1) divinylbenzene is analyzed under open conditions, that is in a continuous well-stirred tank reactor (CSTR). With this aim the appropriate bifurcation diagram is found and the behavior of the system with and without polymer in the vicinity of the bifurcation point is used for the polymer examinations. Two different granulations of polymer are considered. Moreover, some physicochemical characteristics of the polymer, such as specific surface area, skeletal and particle density, are determined.
1390.
Škipina, B; Čajkovski, T; Davidović, M; Čajkovski, D; Likar-Smiljanić, V; Míoč, U B
Conductivity of grains and grain boundaries in polycrystalllne heteropoly acid salts Journal Article
In: Materials Science Forum, vol. 494, pp. 101-106, 2005.
@article{Škipina2005101,
title = {Conductivity of grains and grain boundaries in polycrystalllne heteropoly acid salts},
author = {B Škipina and T Čajkovski and M Davidović and D Čajkovski and V Likar-Smiljanić and U B Míoč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248839528&doi=10.4028%2f0-87849-971-7.101&partnerID=40&md5=95684066ad6cafcb1891911d13db2907},
doi = {10.4028/0-87849-971-7.101},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {101-106},
abstract = {In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.
1391.
Mentus, S; Majstorović, D M; Tomić, B S; Dimitrijević, R Ž
Reduction of NiO-WO3 oxide mixtures synthesized by gel-combustion technique: A route to Ni-W alloys Journal Article
In: Materials Science Forum, vol. 494, pp. 345-350, 2005.
@article{Mentus2005345,
title = {Reduction of NiO-WO3 oxide mixtures synthesized by gel-combustion technique: A route to Ni-W alloys},
author = {S Mentus and D M Majstorović and B S Tomić and R Ž Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947313810&doi=10.4028%2f0-87849-971-7.345&partnerID=40&md5=e18f69b7484f5ad0d7b71ef738e9a41b},
doi = {10.4028/0-87849-971-7.345},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {345-350},
abstract = {The mixtures NiO-WO3 were synthesized by the combustion of gels obtained by drying common solutions of nickel nitrate, polytungstic acid and citric acid. The X-ray diffractograms of oxide mixtures confirmed mutual interaction of oxides during synthesis leading to a new phase, NiWO4. The reduction of oxide mixtures in hydrogen atmosphere was investigated thermogravimetrically. The temperature of reduction of the oxide mixture lies between the temperatures of reduction of pure oxides and monotonously increases with the increase in WO3 mole fraction; however, the reduction itself is a multi-step process, preferably in the composition region rich in NiO. The X-ray diffractometry of metallic residues evidenced Ni-W alloys and tungsten excess to be the reduction products.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The mixtures NiO-WO3 were synthesized by the combustion of gels obtained by drying common solutions of nickel nitrate, polytungstic acid and citric acid. The X-ray diffractograms of oxide mixtures confirmed mutual interaction of oxides during synthesis leading to a new phase, NiWO4. The reduction of oxide mixtures in hydrogen atmosphere was investigated thermogravimetrically. The temperature of reduction of the oxide mixture lies between the temperatures of reduction of pure oxides and monotonously increases with the increase in WO3 mole fraction; however, the reduction itself is a multi-step process, preferably in the composition region rich in NiO. The X-ray diffractometry of metallic residues evidenced Ni-W alloys and tungsten excess to be the reduction products.
1392.
Ciric-Marjanovic, G; Marjanović, B; Trchová, M; Holler, P
Structural characterization of poly(o-tolidine) Journal Article
In: Materials Science Forum, vol. 494, pp. 357-362, 2005.
@article{Ciric-Marjanovic2005357,
title = {Structural characterization of poly(o-tolidine)},
author = {G Ciric-Marjanovic and B Marjanović and M Trchová and P Holler},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248888967&doi=10.4028%2f0-87849-971-7.357&partnerID=40&md5=cbbd27bbb36aa52c8db56d621a05b4d7},
doi = {10.4028/0-87849-971-7.357},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {357-362},
abstract = {A new polymer of o-tolidine was synthesized by chemical and electrochemical methods from its aqueous solutions in 1M HCl. Chemical oxidative polymerization was performed using ammonium peroxydisulfate as an oxidant. Electrochemical polymerization was carried out using two steps which were successively repeated in a continual process: first, holding the working platinum electrode under a constant anodic potential of+1.6 V, and second, the voltammetric cycle between +0.3 and +1.6 V. During this procedure a polymeric film was formed on the working electrode. Polymerization of o-tolidine was exactly proved by gel permeation chromatography evidencing the chains of molar masses in the range of 1000 - 12600 g mol-1. The structure of poly(o-tolidines) obtained by both chemical and electrochemical procedures was studied by IR spectroscopy. Coupling pathway N-C during polymerization, existence of quinonoid rings and hydrogen bonding involving NH group in polymeric products are revealed by IR spectroscopic analysis. The mechanism of o-tolidine oxidative polymerization is proposed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A new polymer of o-tolidine was synthesized by chemical and electrochemical methods from its aqueous solutions in 1M HCl. Chemical oxidative polymerization was performed using ammonium peroxydisulfate as an oxidant. Electrochemical polymerization was carried out using two steps which were successively repeated in a continual process: first, holding the working platinum electrode under a constant anodic potential of+1.6 V, and second, the voltammetric cycle between +0.3 and +1.6 V. During this procedure a polymeric film was formed on the working electrode. Polymerization of o-tolidine was exactly proved by gel permeation chromatography evidencing the chains of molar masses in the range of 1000 - 12600 g mol-1. The structure of poly(o-tolidines) obtained by both chemical and electrochemical procedures was studied by IR spectroscopy. Coupling pathway N-C during polymerization, existence of quinonoid rings and hydrogen bonding involving NH group in polymeric products are revealed by IR spectroscopic analysis. The mechanism of o-tolidine oxidative polymerization is proposed.
1393.
Krstić, J; Vukelić, N; Nedić, Z; Milutinovic-Nikolić, A; Šućurović, A; Jovanović, D
Nickel/silica precursor from sodium silicate solution - Synthesis and characterization Journal Article
In: Materials Science Forum, vol. 494, pp. 333-338, 2005.
@article{Krstić2005333,
title = {Nickel/silica precursor from sodium silicate solution - Synthesis and characterization},
author = {J Krstić and N Vukelić and Z Nedić and A Milutinovic-Nikolić and A Šućurović and D Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248833651&doi=10.4028%2f0-87849-971-7.333&partnerID=40&md5=bb49a8cb494c9053712dfda5d6b36758},
doi = {10.4028/0-87849-971-7.333},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {333-338},
abstract = {The aim of this paper was the investigation of the influence of synthesis parameters, as well as the order of synthesis steps, in procedure of chemical precipitation, on the properties of synthesized nickel precursor. The starting materials were always the same aqueous solutions of Ni(NO3) 2·6H2O and Mg(NO3)2· 6H2O of constant molar ratio, 2% solution of SiO2 in the form of sodium silicate solution (module SiO2/Na2O = 3.0) and 10% solution of Na2CO3, while synthesis steps and addition modes were varied. Complete pH and temperature monitoring was performed during entire synthesis at 90°C. The formed precipitate aged 30 minutes at synthesis temperature. By changing the order and conditions of adding SiO 2 and Na2CO3 solutions and keeping the treatment of precipitates the same (rinsing with hot distilled water followed by drying at 110°C for 24 hours) six different precursors were obtained. Samples characterizations were performed using different experimental techniques: XRD analysis, IR spectroscopy, reflection spectroscopy, TG analysis, N2 physisorption. The relation between synthesis procedure and precursor properties was established.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The aim of this paper was the investigation of the influence of synthesis parameters, as well as the order of synthesis steps, in procedure of chemical precipitation, on the properties of synthesized nickel precursor. The starting materials were always the same aqueous solutions of Ni(NO3) 2·6H2O and Mg(NO3)2· 6H2O of constant molar ratio, 2% solution of SiO2 in the form of sodium silicate solution (module SiO2/Na2O = 3.0) and 10% solution of Na2CO3, while synthesis steps and addition modes were varied. Complete pH and temperature monitoring was performed during entire synthesis at 90°C. The formed precipitate aged 30 minutes at synthesis temperature. By changing the order and conditions of adding SiO 2 and Na2CO3 solutions and keeping the treatment of precipitates the same (rinsing with hot distilled water followed by drying at 110°C for 24 hours) six different precursors were obtained. Samples characterizations were performed using different experimental techniques: XRD analysis, IR spectroscopy, reflection spectroscopy, TG analysis, N2 physisorption. The relation between synthesis procedure and precursor properties was established.
1394.
Dondur, V; Dimitrijević, R; Kremenović, A; Damjanović, Lj.; Kićanović, M; Cheong, H M; Macura, S
Phase transformation of hexacelsians doped with Li, Na and Ca Journal Article
In: Materials Science Forum, vol. 494, pp. 107-112, 2005.
@article{Dondur2005107,
title = {Phase transformation of hexacelsians doped with Li, Na and Ca},
author = {V Dondur and R Dimitrijević and A Kremenović and Lj. Damjanović and M Kićanović and H M Cheong and S Macura},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34548537839&doi=10.4028%2f0-87849-971-7.107&partnerID=40&md5=84c12381d4f5ab90b2df0a7642624363},
doi = {10.4028/0-87849-971-7.107},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {107-112},
abstract = {A series of hexacelsians with different compositions were synthesized by thermally induced transformation of a LTA zeolite. Various forms of hexacelsians have been characterized by XRPD, IR, Raman and 29Si MAS NMR method. The phase transformation α→β hexacelsian was investigated by DSC method. This phase transformation is sensitive to synthesis conditions, doping and thermal treatment. The peak maximum temperature, Tm, varies from 302 up to 353 °C. Heat of transformation changes from 0.42 to 1.77 kJ/mol.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A series of hexacelsians with different compositions were synthesized by thermally induced transformation of a LTA zeolite. Various forms of hexacelsians have been characterized by XRPD, IR, Raman and 29Si MAS NMR method. The phase transformation α→β hexacelsian was investigated by DSC method. This phase transformation is sensitive to synthesis conditions, doping and thermal treatment. The peak maximum temperature, Tm, varies from 302 up to 353 °C. Heat of transformation changes from 0.42 to 1.77 kJ/mol.
1395.
Radotić, K; Mićić, M; Jeremić, M
Scanning Probe Microscopy of Plant Cell Wall and Its Constituents Book
2005.
@book{Radotić200595,
title = {Scanning Probe Microscopy of Plant Cell Wall and Its Constituents},
author = {K Radotić and M Mićić and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79955102041&doi=10.1002%2f0470007702.ch6&partnerID=40&md5=90e6dc109204341e053c24a6a8c3eb73},
doi = {10.1002/0470007702.ch6},
year = {2005},
date = {2005-01-01},
journal = {Force Microscopy: Applications in Biology and Medicine},
pages = {95-112},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
1396.
Miodragović, Dj. U.; Miodragović, Z M; Skala, D; Malinar, M J; Minić, D M; Andjelković, K
In: Thermochimica Acta, vol. 436, no. 1-2, pp. 90-95, 2005.
@article{Miodragović200590,
title = {Mixed cobalt(III) complexes with aromatic amino acids and diamine: Part V. Thermal investigation of (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex diastereomers},
author = {Dj.U. Miodragović and Z M Miodragović and D Skala and M J Malinar and D M Minić and K Andjelković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24344482084&doi=10.1016%2fj.tca.2004.07.007&partnerID=40&md5=75a55123a656f7bda64a063edb4eabdf},
doi = {10.1016/j.tca.2004.07.007},
year = {2005},
date = {2005-01-01},
journal = {Thermochimica Acta},
volume = {436},
number = {1-2},
pages = {90-95},
abstract = {Thermal properties of (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex diastereomers are investigated by means of TG technique in 293-873 K temperature range. This is a first thermal study of [Co(S-aa) 2 en] + (S-aa = anion of S-amino acid; en = 1,2-diaminoethane) complex diastereomers. It is shown that thermal decompositions of these complexes are multi-step degradation processes, which in some cases can be satisfactory separated into individual steps, depending on the molecular symmetry. It is proposed that the degradation processes occur with cleavage of the side chain of one S-tyrosinato ligand, followed by the cleavage of the second side chain by further heating. The proposed pathways of decomposition are in accordance with results of thermal degradation of noncoordinated S-tyrosine [F. Rodante, G. Marrosu, G. Catalani, Thermochim. Acta 194 (1992) 197-213]. In the case of diastereomers which crystallize with water molecules, the departure of both hygroscopic and crystal water occurs before. The corresponding kinetic and thermodynamic parameters of some processes were determined. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal properties of (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex diastereomers are investigated by means of TG technique in 293-873 K temperature range. This is a first thermal study of [Co(S-aa) 2 en] + (S-aa = anion of S-amino acid; en = 1,2-diaminoethane) complex diastereomers. It is shown that thermal decompositions of these complexes are multi-step degradation processes, which in some cases can be satisfactory separated into individual steps, depending on the molecular symmetry. It is proposed that the degradation processes occur with cleavage of the side chain of one S-tyrosinato ligand, followed by the cleavage of the second side chain by further heating. The proposed pathways of decomposition are in accordance with results of thermal degradation of noncoordinated S-tyrosine [F. Rodante, G. Marrosu, G. Catalani, Thermochim. Acta 194 (1992) 197-213]. In the case of diastereomers which crystallize with water molecules, the departure of both hygroscopic and crystal water occurs before. The corresponding kinetic and thermodynamic parameters of some processes were determined. © 2004 Elsevier B.V. All rights reserved.
1397.
Čajkovski, T; Davidović, M; Pissis, P; Polizos, G; Čajkovski, D; Likar-Smiljanić, V; Sredić, S; Mioč, U B
Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid Journal Article
In: Journal of Non-Crystalline Solids, vol. 351, no. 33-36 SPEC. ISS., pp. 2842-2848, 2005.
@article{Čajkovski20052842,
title = {Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid},
author = {T Čajkovski and M Davidović and P Pissis and G Polizos and D Čajkovski and V Likar-Smiljanić and S Sredić and U B Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24344469654&doi=10.1016%2fj.jnoncrysol.2005.05.032&partnerID=40&md5=3b3bcaab5935f45a70839b3d49511018},
doi = {10.1016/j.jnoncrysol.2005.05.032},
year = {2005},
date = {2005-01-01},
journal = {Journal of Non-Crystalline Solids},
volume = {351},
number = {33-36 SPEC. ISS.},
pages = {2842-2848},
abstract = {Aluminum-pillared montmorillonite (PILC MM) was doped with 12-tungstophosphoric acid hexahydrate (WPA-6) by the sol-gel method. Using broad band dielectric relaxation spectroscopy (DRS), electrical properties of the obtained material were investigated. Thermally stimulated depolarization current technique was also used due to its high sensitivity and high resolving power. It has been established that pillared montmorillonite doped with WPA-6 (H 3PW12O40 • 6H2O) shows conductivity higher than that of the pure components. Phase transition, which in WPA-6 takes place above 50 °C, in doped montmorillonite occurs above 70 °C. The conductivity activation energy is 0.27 eV. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Aluminum-pillared montmorillonite (PILC MM) was doped with 12-tungstophosphoric acid hexahydrate (WPA-6) by the sol-gel method. Using broad band dielectric relaxation spectroscopy (DRS), electrical properties of the obtained material were investigated. Thermally stimulated depolarization current technique was also used due to its high sensitivity and high resolving power. It has been established that pillared montmorillonite doped with WPA-6 (H 3PW12O40 • 6H2O) shows conductivity higher than that of the pure components. Phase transition, which in WPA-6 takes place above 50 °C, in doped montmorillonite occurs above 70 °C. The conductivity activation energy is 0.27 eV. © 2005 Elsevier B.V. All rights reserved.
1398.
Stanisavljev, D R; Djordjević, A R; Likar-Smiljanić, V D
Investigation of microwave effects on the oscillatory Bray-Liebhafsky reaction Journal Article
In: Chemical Physics Letters, vol. 412, no. 4-6, pp. 420-424, 2005.
@article{Stanisavljev2005420,
title = {Investigation of microwave effects on the oscillatory Bray-Liebhafsky reaction},
author = {D R Stanisavljev and A R Djordjević and V D Likar-Smiljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-23944442696&doi=10.1016%2fj.cplett.2005.07.027&partnerID=40&md5=39e688132ec8b0a6bcb378979fff365f},
doi = {10.1016/j.cplett.2005.07.027},
year = {2005},
date = {2005-01-01},
journal = {Chemical Physics Letters},
volume = {412},
number = {4-6},
pages = {420-424},
abstract = {A specific control of the Bray-Liebhafsky oscillatory reaction is achieved by changing the microwave (MW) participation in heating the reaction mixture. Experiments are performed at temperatures Trm = 62, 65, 68 °C. Before the bifurcation point, increased MW participation has no effect on the reaction mechanism. In the sensitive state close to the bifurcation point, increased MW participation stops the oscillatory evolution. To explain the reaction dynamics in the MW field, we consider classical causes (overheating and convection effects) in contrast to some specific effects of the MW heating. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A specific control of the Bray-Liebhafsky oscillatory reaction is achieved by changing the microwave (MW) participation in heating the reaction mixture. Experiments are performed at temperatures Trm = 62, 65, 68 °C. Before the bifurcation point, increased MW participation has no effect on the reaction mechanism. In the sensitive state close to the bifurcation point, increased MW participation stops the oscillatory evolution. To explain the reaction dynamics in the MW field, we consider classical causes (overheating and convection effects) in contrast to some specific effects of the MW heating. © 2005 Elsevier B.V. All rights reserved.
1399.
Stojić, D. Lj.; Maksić, A D; Kaninski, M P M; Cekić, B D; Miljanić, S S
Improved energy efficiency of the electrolytic evolution of hydrogen - Comparison of conventional and advanced electrode materials Journal Article
In: Journal of Power Sources, vol. 145, no. 2, pp. 278-281, 2005.
@article{Stojić2005278,
title = {Improved energy efficiency of the electrolytic evolution of hydrogen - Comparison of conventional and advanced electrode materials},
author = {D.Lj. Stojić and A D Maksić and M P M Kaninski and B D Cekić and S S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-23844432661&doi=10.1016%2fj.jpowsour.2004.12.077&partnerID=40&md5=4654b79fb101a7c6d2e68645fa3d5640},
doi = {10.1016/j.jpowsour.2004.12.077},
year = {2005},
date = {2005-01-01},
journal = {Journal of Power Sources},
volume = {145},
number = {2},
pages = {278-281},
abstract = {With the idea to improve the efficiency of the electrolytic production of hydrogen by electrolysis, from water KOH solutions, the intermetallic Hf 2 Co was investigated as cathode. This cathode was used single or in combination with ionic activators, and compared with several intermetallics previously investigated: Hf 2 Fe, TiPt, and PtMo 3 . A comparison with conventional cathode, nickel, was also evaluated. An significant upgrade of the electrolytic efficiency using intermetallics was achieved in comparison with conventional cathode materials. The influence of ionic activators on the process efficiency was significant, too. The effects of those cathode materials on the electrolytic evolution of hydrogen were discussed in the context of transition metals features that issue from their electronic configuration. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
With the idea to improve the efficiency of the electrolytic production of hydrogen by electrolysis, from water KOH solutions, the intermetallic Hf 2 Co was investigated as cathode. This cathode was used single or in combination with ionic activators, and compared with several intermetallics previously investigated: Hf 2 Fe, TiPt, and PtMo 3 . A comparison with conventional cathode, nickel, was also evaluated. An significant upgrade of the electrolytic efficiency using intermetallics was achieved in comparison with conventional cathode materials. The influence of ionic activators on the process efficiency was significant, too. The effects of those cathode materials on the electrolytic evolution of hydrogen were discussed in the context of transition metals features that issue from their electronic configuration. © 2005 Elsevier B.V. All rights reserved.
1400.
Mladenović, M; Perić, M; Engels, B
In: Journal of Chemical Physics, vol. 122, no. 20, 2005.
@article{Mladenović2005,
title = {Erratum: An ab initio calculation of the anisotropic hyperfine coupling constants in the low-lying vibronic levels of the X 2 ∏ electronic state of CCCH (J. Chem. Phys. (2004) 121 (12361))},
author = {M Mladenović and M Perić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-20844461945&doi=10.1063%2f1.1903948&partnerID=40&md5=5698e0c14859fc88ce742f5b26626072},
doi = {10.1063/1.1903948},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Physics},
volume = {122},
number = {20},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2006
Etinski, M; Uiberacker, C; Jakubetz, W
Counterdiabatic suppression of background state population in resonance leaking by controlling intermediate branching Journal Article
In: Journal of Chemical Physics, vol. 124, no. 12, 2006.
@article{Etinski2006,
title = {Counterdiabatic suppression of background state population in resonance leaking by controlling intermediate branching},
author = {M Etinski and C Uiberacker and W Jakubetz},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34547649495&doi=10.1063%2f1.2180250&partnerID=40&md5=b7c85e90531395291a42e26b7c29a298},
doi = {10.1063/1.2180250},
year = {2006},
date = {2006-01-01},
journal = {Journal of Chemical Physics},
volume = {124},
number = {12},
abstract = {The counterdiabatic principle [M. Demirplak and S. A. Rice, J. Phys. Chem. A 107, 9937 (2003)] is used in a pragmatic way to formulate a practical control strategy for perturbed population transfer. Interpreting the appearance of population in undesirable intruder or background states as phenomenological consequences of diabatic perturbations, such branching is suppressed as soon as it arises. By invoking a penalty term that is sensitive to any transitional population in undesirable levels, a correction field is created which effectively prevents diabatic behavior. This strategy is applied to the control of background state population in multiphoton excitations. For a model five-level system we show that leaking of a resonant three-photon transition to a background state can readily be suppressed by simple correction fields obtained from our intermediate-branching driven implementation of counterdiabatic control. © 2006 American Institute of Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The counterdiabatic principle [M. Demirplak and S. A. Rice, J. Phys. Chem. A 107, 9937 (2003)] is used in a pragmatic way to formulate a practical control strategy for perturbed population transfer. Interpreting the appearance of population in undesirable intruder or background states as phenomenological consequences of diabatic perturbations, such branching is suppressed as soon as it arises. By invoking a penalty term that is sensitive to any transitional population in undesirable levels, a correction field is created which effectively prevents diabatic behavior. This strategy is applied to the control of background state population in multiphoton excitations. For a model five-level system we show that leaking of a resonant three-photon transition to a background state can readily be suppressed by simple correction fields obtained from our intermediate-branching driven implementation of counterdiabatic control. © 2006 American Institute of Physics.
2005
Rakić, V; Rac, V; Dondur, V; Auroux, A
Competitive adsorption of N 2 O and CO on CuZSM-5, FeZSM-5, CoZSM-5 and bimetallic forms of ZSM-5 zeolite Journal Article
In: Catalysis Today, vol. 110, no. 3-4, pp. 272-280, 2005.
@article{Rakić2005272,
title = {Competitive adsorption of N 2 O and CO on CuZSM-5, FeZSM-5, CoZSM-5 and bimetallic forms of ZSM-5 zeolite},
author = {V Rakić and V Rac and V Dondur and A Auroux},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-27844466727&doi=10.1016%2fj.cattod.2005.09.027&partnerID=40&md5=4ee8d6cdf2714e2576817b0529d8e1fa},
doi = {10.1016/j.cattod.2005.09.027},
year = {2005},
date = {2005-01-01},
journal = {Catalysis Today},
volume = {110},
number = {3-4},
pages = {272-280},
abstract = {The behavior of copper-, iron- and cobalt-exchanged ZSM-5 (Si/Al = 20) and bimetallic forms of the same zeolite was investigated with reference to the adsorption of N 2 O and CO at 303 K. The interactions of both gases with investigated zeolites have been studied using microcalorimetry and infrared spectroscopy. The values of differential heats of adsorption and the amounts of adsorbed gases were determined. Both gases react with the charge-balancing cations as active sites for adsorption. CuZSM-5 shows significantly better performances than FeZSM-5 and CoZSM-5, toward both gases; additionally, nitrous oxide can be chemisorbed on CuZSM-5. Adsorption capabilities of FeZSM-5 and CoZSM-5 are increased with the addition of copper ions. The heats of CO interaction with copper-containing samples have been found to be higher then the heats of N 2 O interaction, while for FeZSM-5 and CoZSM-5 samples similar heats were detected for both gases. In the case of CuZSM-5, as a result of competitive adsorption between previously adsorbed N 2 O and incoming CO from the gas phase, a surface reaction is found. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The behavior of copper-, iron- and cobalt-exchanged ZSM-5 (Si/Al = 20) and bimetallic forms of the same zeolite was investigated with reference to the adsorption of N 2 O and CO at 303 K. The interactions of both gases with investigated zeolites have been studied using microcalorimetry and infrared spectroscopy. The values of differential heats of adsorption and the amounts of adsorbed gases were determined. Both gases react with the charge-balancing cations as active sites for adsorption. CuZSM-5 shows significantly better performances than FeZSM-5 and CoZSM-5, toward both gases; additionally, nitrous oxide can be chemisorbed on CuZSM-5. Adsorption capabilities of FeZSM-5 and CoZSM-5 are increased with the addition of copper ions. The heats of CO interaction with copper-containing samples have been found to be higher then the heats of N 2 O interaction, while for FeZSM-5 and CoZSM-5 samples similar heats were detected for both gases. In the case of CuZSM-5, as a result of competitive adsorption between previously adsorbed N 2 O and incoming CO from the gas phase, a surface reaction is found. © 2005 Elsevier B.V. All rights reserved.
Radić-Perić, J
Formation of solid TiC from thermal plasma: Thermodynamic consideration Journal Article
In: Materials Science Forum, vol. 494, pp. 303-308, 2005.
@article{Radić-Perić2005303,
title = {Formation of solid TiC from thermal plasma: Thermodynamic consideration},
author = {J Radić-Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248895305&doi=10.4028%2f0-87849-971-7.303&partnerID=40&md5=64aa56f76b66e12fc4ae4aff4c800ae7},
doi = {10.4028/0-87849-971-7.303},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {303-308},
abstract = {The synthesis process of solid TiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixture containing titanium and chlorine (titanium as a reactant is assumed to be in the form of titanium tetrachloride) with argon, hydrogen and carbon (carbon as a reactant is assumed to be in the form of methane). The calculation was performed for the temperature range between 500 and 6000 K and the total pressure in the system of 1 bar. The fact that thermal plasma is plasma in (local) thermodynamic equilibrium made possible the theoretical determination (by employing the Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state) of its equilibrium composition. From the calculated compositions of the investigated gas systems the temperature zones with saturated and/or oversaturated vapor of Ti, TiC and C were determined and the mechanism of the formation of TiC in solid state was proposed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The synthesis process of solid TiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixture containing titanium and chlorine (titanium as a reactant is assumed to be in the form of titanium tetrachloride) with argon, hydrogen and carbon (carbon as a reactant is assumed to be in the form of methane). The calculation was performed for the temperature range between 500 and 6000 K and the total pressure in the system of 1 bar. The fact that thermal plasma is plasma in (local) thermodynamic equilibrium made possible the theoretical determination (by employing the Gibbs free energy data for the compounds present in the system and assuming that the equilibrium of the system corresponds to its minimum energy state) of its equilibrium composition. From the calculated compositions of the investigated gas systems the temperature zones with saturated and/or oversaturated vapor of Ti, TiC and C were determined and the mechanism of the formation of TiC in solid state was proposed.
Todorović, T; Andjelković, K; Sladić, D; Jeremić, D; Minić, D
Investigation of thermal stability of Zn(II), Pt(II) and Pd(II) complexes with (E)2-oxo-2-N'-[1-(pyridin-2-yl)ethylidene]hydrazinoacetamide Journal Article
In: Materials Science Forum, vol. 494, pp. 375-380, 2005.
@article{Todorović2005375,
title = {Investigation of thermal stability of Zn(II), Pt(II) and Pd(II) complexes with (E)2-oxo-2-N'-[1-(pyridin-2-yl)ethylidene]hydrazinoacetamide},
author = {T Todorović and K Andjelković and D Sladić and D Jeremić and D Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248849769&doi=10.4028%2f0-87849-971-7.375&partnerID=40&md5=f8a4188cf451cfc06d9a7d424177d55b},
doi = {10.4028/0-87849-971-7.375},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {375-380},
abstract = {Thermal stability of neutral Zn(II), Pd(II) and Pt(II) complexes of formulae [Zn(apsox)2]·3H2O and [M(apsox)Cl] (M=Pd(II), Pt(II)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal stability of neutral Zn(II), Pd(II) and Pt(II) complexes of formulae [Zn(apsox)2]·3H2O and [M(apsox)Cl] (M=Pd(II), Pt(II)
Argirusis, Chr.; Damjanović, T; Stojanović, M; Borchardt, G
Synthesis and electrophoretic deposition of an yttrium silicate coating system for oxidation protection of C/C-Si-SiC composites Journal Article
In: Materials Science Forum, vol. 494, pp. 451-456, 2005.
@article{Argirusis2005451,
title = {Synthesis and electrophoretic deposition of an yttrium silicate coating system for oxidation protection of C/C-Si-SiC composites},
author = {Chr. Argirusis and T Damjanović and M Stojanović and G Borchardt},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33750978200&doi=10.4028%2f0-87849-971-7.451&partnerID=40&md5=5f2ed403ac36d732d1ecfabcc5e7d8c9},
doi = {10.4028/0-87849-971-7.451},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {451-456},
abstract = {Due to favorable chemical and mechanical properties of yttrium silicate coatings (low Young's modulus, low thermal expansion coefficient, low evaporation rate and oxygen permeability, good erosion resistance), this material is a promising complement to SiC coatings for protecting C/C-Si-SiC composites. For the preparation of silicate powders, the Pechini method was used. As a coating method, electrophoretic deposition from stable suspensions based on isopropanol was chosen. Under controlled deposition voltage and duration, coatings of various thicknesses were deposited. The deposited layers were characterized by SEM and EDX analysis. The protectiveness of these coatings was tested by isothermal thermogravimetry.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Due to favorable chemical and mechanical properties of yttrium silicate coatings (low Young's modulus, low thermal expansion coefficient, low evaporation rate and oxygen permeability, good erosion resistance), this material is a promising complement to SiC coatings for protecting C/C-Si-SiC composites. For the preparation of silicate powders, the Pechini method was used. As a coating method, electrophoretic deposition from stable suspensions based on isopropanol was chosen. Under controlled deposition voltage and duration, coatings of various thicknesses were deposited. The deposited layers were characterized by SEM and EDX analysis. The protectiveness of these coatings was tested by isothermal thermogravimetry.
Parac, M; Etinski, M; Peric, M; Grimme, S
A theoretical investigation of the geometries and binding energies of molecular tweezer and clip host-guest systems Journal Article
In: Journal of Chemical Theory and Computation, vol. 1, no. 6, pp. 1110-1118, 2005.
@article{Parac20051110,
title = {A theoretical investigation of the geometries and binding energies of molecular tweezer and clip host-guest systems},
author = {M Parac and M Etinski and M Peric and S Grimme},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33748762575&doi=10.1021%2fct050122n&partnerID=40&md5=fd25f3330d0f3264d498833460757fdb},
doi = {10.1021/ct050122n},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Theory and Computation},
volume = {1},
number = {6},
pages = {1110-1118},
abstract = {A quantum chemical study of host-guest systems with dimethylene-bridged clips and tetramethylene-bridged tweezers as host molecules and six different aliphatic and aromatic substrates as guests is presented. The geometries and binding energies of the complexes are investigated using the recently developed density functional theory with empirical corrections for dispersion interactions (DFT-D) in combination with the BLYP functional and basis sets of TZVP quality. It is found that the DFT-D method provides accurate geometries for the host-guest complexes that compare very favorably to experimental X-ray data. Without the dispersion correction, all host-guest complexes are unbound at the pure DFT level. Calculations of the clip complexes show that the DFT-D binding energies of the guests agree well with those from a more sophisticated SCS-MP2/aug-cc-pVTZ treatment. By a partitioning of the host into molecular fragments it is shown that the binding energy is clearly dominated by the aromatic units of the clip. An energy decomposition analysis of the interaction energies of some tweezer complexes revealed the decisive role of the electrostatic and dispersion contributions for relative stabilities. The calculations on the tweezer complexes show that the benzene spaced tweezer is a better receptor for aliphatic substrates than its naphthalene analogue that has a better topology for the binding of aromatic substrates. The tweezer with a OAc substituent in the central spacer unit is found to favor complex formation with both aliphatic and aromatic substrates. The theoretical results are qualitatively in very good agreement with previous experimental findings although direct comparison with experimental binding energies which include solvent effects is not possible. The good results obtained with the DFT-D-BLYP method suggest this approach as a standard tool in supramolecular chemistry and as the method of choice for theoretical structure determinations of large complexes where both electrostatic and dispersive interactions are crucial. © 2005 American Chemical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A quantum chemical study of host-guest systems with dimethylene-bridged clips and tetramethylene-bridged tweezers as host molecules and six different aliphatic and aromatic substrates as guests is presented. The geometries and binding energies of the complexes are investigated using the recently developed density functional theory with empirical corrections for dispersion interactions (DFT-D) in combination with the BLYP functional and basis sets of TZVP quality. It is found that the DFT-D method provides accurate geometries for the host-guest complexes that compare very favorably to experimental X-ray data. Without the dispersion correction, all host-guest complexes are unbound at the pure DFT level. Calculations of the clip complexes show that the DFT-D binding energies of the guests agree well with those from a more sophisticated SCS-MP2/aug-cc-pVTZ treatment. By a partitioning of the host into molecular fragments it is shown that the binding energy is clearly dominated by the aromatic units of the clip. An energy decomposition analysis of the interaction energies of some tweezer complexes revealed the decisive role of the electrostatic and dispersion contributions for relative stabilities. The calculations on the tweezer complexes show that the benzene spaced tweezer is a better receptor for aliphatic substrates than its naphthalene analogue that has a better topology for the binding of aromatic substrates. The tweezer with a OAc substituent in the central spacer unit is found to favor complex formation with both aliphatic and aromatic substrates. The theoretical results are qualitatively in very good agreement with previous experimental findings although direct comparison with experimental binding energies which include solvent effects is not possible. The good results obtained with the DFT-D-BLYP method suggest this approach as a standard tool in supramolecular chemistry and as the method of choice for theoretical structure determinations of large complexes where both electrostatic and dispersive interactions are crucial. © 2005 American Chemical Society.
Jokanović, V; Mioč, U B; Nedić, Z P
Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis Journal Article
In: Solid State Ionics, vol. 176, no. 39-40, pp. 2955-2956, 2005.
@article{Jokanović20052955,
title = {Nanostructured phosphorous tungsten bronzes from ultrasonic spray pyrolysis},
author = {V Jokanović and U B Mioč and Z P Nedić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-28844440390&doi=10.1016%2fj.ssi.2005.09.029&partnerID=40&md5=d66d0f893bd4912dae3de7337e8b4f0b},
doi = {10.1016/j.ssi.2005.09.029},
year = {2005},
date = {2005-01-01},
journal = {Solid State Ionics},
volume = {176},
number = {39-40},
pages = {2955-2956},
abstract = {Ultrasonic spray pyrolysis has been used to obtain fine spherical powders of WPA bronzes from a 29-tungstenphosphoric acid (WPA-29) feed solution. The average grain size of the obtained powder particles is ca. 1000 nm; these consist of subparticles in the 30-80 nm range. The experimentally determined average WPA bronze particle size values are compared with theoretically calculated ones; fairly good agreement between them is found. It is also shown that the average grain size and grain size distribution of the structure and substructure of the obtained powder are predictable. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ultrasonic spray pyrolysis has been used to obtain fine spherical powders of WPA bronzes from a 29-tungstenphosphoric acid (WPA-29) feed solution. The average grain size of the obtained powder particles is ca. 1000 nm; these consist of subparticles in the 30-80 nm range. The experimentally determined average WPA bronze particle size values are compared with theoretically calculated ones; fairly good agreement between them is found. It is also shown that the average grain size and grain size distribution of the structure and substructure of the obtained powder are predictable. © 2005 Elsevier B.V. All rights reserved.
Janković, B; Adnadević, B; Jovanović, J; Minić, D; Kolar-Anić, Lj.
Thermogravimetric analysis of superabsorbing polyacrylic hydrogel Journal Article
In: Materials Science Forum, vol. 494, pp. 193-198, 2005.
@article{Janković2005193,
title = {Thermogravimetric analysis of superabsorbing polyacrylic hydrogel},
author = {B Janković and B Adnadević and J Jovanović and D Minić and Lj. Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33845908013&doi=10.4028%2f0-87849-971-7.193&partnerID=40&md5=3314b6afbcf0d98abfc50cf946b52156},
doi = {10.4028/0-87849-971-7.193},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {193-198},
abstract = {The thermogravimetric analysis of superabsorbing polyacrylic hydrogel dehydration, performed under non-isothermal conditions at different heating rates was discussed. Particularly, the influence of the heating rate on the obtained results is given in detail. For this purpose the Weibull distribution function was applied. The thermogravimetric curve when the heating rate tends to zero was evaluated. The activation energy E = 63 kJ/mol, pre-exponential factors = 2.97 × 108 min-1, and rate constant k = 2.76 × 10-3 min-1 were determined on the basis of this curve.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The thermogravimetric analysis of superabsorbing polyacrylic hydrogel dehydration, performed under non-isothermal conditions at different heating rates was discussed. Particularly, the influence of the heating rate on the obtained results is given in detail. For this purpose the Weibull distribution function was applied. The thermogravimetric curve when the heating rate tends to zero was evaluated. The activation energy E = 63 kJ/mol, pre-exponential factors = 2.97 × 108 min-1, and rate constant k = 2.76 × 10-3 min-1 were determined on the basis of this curve.
Milošević, M; Pejić, N; Čupić, Ž; Anić, S; Kolar-Anić, Lj.
Examinations of cross-linked polyvinylpyridine in open reactor Journal Article
In: Materials Science Forum, vol. 494, pp. 369-374, 2005.
@article{Milošević2005369,
title = {Examinations of cross-linked polyvinylpyridine in open reactor},
author = {M Milošević and N Pejić and Ž Čupić and S Anić and Lj. Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248852872&doi=10.4028%2f0-87849-971-7.369&partnerID=40&md5=a925c4f9b46c7684a121e1ef3706562c},
doi = {10.4028/0-87849-971-7.369},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {369-374},
abstract = {Macroporous cross-linked copolymer of 4-vinylpyridine and 25% (4:1) divinylbenzene is analyzed under open conditions, that is in a continuous well-stirred tank reactor (CSTR). With this aim the appropriate bifurcation diagram is found and the behavior of the system with and without polymer in the vicinity of the bifurcation point is used for the polymer examinations. Two different granulations of polymer are considered. Moreover, some physicochemical characteristics of the polymer, such as specific surface area, skeletal and particle density, are determined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Macroporous cross-linked copolymer of 4-vinylpyridine and 25% (4:1) divinylbenzene is analyzed under open conditions, that is in a continuous well-stirred tank reactor (CSTR). With this aim the appropriate bifurcation diagram is found and the behavior of the system with and without polymer in the vicinity of the bifurcation point is used for the polymer examinations. Two different granulations of polymer are considered. Moreover, some physicochemical characteristics of the polymer, such as specific surface area, skeletal and particle density, are determined.
Škipina, B; Čajkovski, T; Davidović, M; Čajkovski, D; Likar-Smiljanić, V; Míoč, U B
Conductivity of grains and grain boundaries in polycrystalllne heteropoly acid salts Journal Article
In: Materials Science Forum, vol. 494, pp. 101-106, 2005.
@article{Škipina2005101,
title = {Conductivity of grains and grain boundaries in polycrystalllne heteropoly acid salts},
author = {B Škipina and T Čajkovski and M Davidović and D Čajkovski and V Likar-Smiljanić and U B Míoč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248839528&doi=10.4028%2f0-87849-971-7.101&partnerID=40&md5=95684066ad6cafcb1891911d13db2907},
doi = {10.4028/0-87849-971-7.101},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {101-106},
abstract = {In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.
Mentus, S; Majstorović, D M; Tomić, B S; Dimitrijević, R Ž
Reduction of NiO-WO3 oxide mixtures synthesized by gel-combustion technique: A route to Ni-W alloys Journal Article
In: Materials Science Forum, vol. 494, pp. 345-350, 2005.
@article{Mentus2005345,
title = {Reduction of NiO-WO3 oxide mixtures synthesized by gel-combustion technique: A route to Ni-W alloys},
author = {S Mentus and D M Majstorović and B S Tomić and R Ž Dimitrijević},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947313810&doi=10.4028%2f0-87849-971-7.345&partnerID=40&md5=e18f69b7484f5ad0d7b71ef738e9a41b},
doi = {10.4028/0-87849-971-7.345},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {345-350},
abstract = {The mixtures NiO-WO3 were synthesized by the combustion of gels obtained by drying common solutions of nickel nitrate, polytungstic acid and citric acid. The X-ray diffractograms of oxide mixtures confirmed mutual interaction of oxides during synthesis leading to a new phase, NiWO4. The reduction of oxide mixtures in hydrogen atmosphere was investigated thermogravimetrically. The temperature of reduction of the oxide mixture lies between the temperatures of reduction of pure oxides and monotonously increases with the increase in WO3 mole fraction; however, the reduction itself is a multi-step process, preferably in the composition region rich in NiO. The X-ray diffractometry of metallic residues evidenced Ni-W alloys and tungsten excess to be the reduction products.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The mixtures NiO-WO3 were synthesized by the combustion of gels obtained by drying common solutions of nickel nitrate, polytungstic acid and citric acid. The X-ray diffractograms of oxide mixtures confirmed mutual interaction of oxides during synthesis leading to a new phase, NiWO4. The reduction of oxide mixtures in hydrogen atmosphere was investigated thermogravimetrically. The temperature of reduction of the oxide mixture lies between the temperatures of reduction of pure oxides and monotonously increases with the increase in WO3 mole fraction; however, the reduction itself is a multi-step process, preferably in the composition region rich in NiO. The X-ray diffractometry of metallic residues evidenced Ni-W alloys and tungsten excess to be the reduction products.
Ciric-Marjanovic, G; Marjanović, B; Trchová, M; Holler, P
Structural characterization of poly(o-tolidine) Journal Article
In: Materials Science Forum, vol. 494, pp. 357-362, 2005.
@article{Ciric-Marjanovic2005357,
title = {Structural characterization of poly(o-tolidine)},
author = {G Ciric-Marjanovic and B Marjanović and M Trchová and P Holler},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248888967&doi=10.4028%2f0-87849-971-7.357&partnerID=40&md5=cbbd27bbb36aa52c8db56d621a05b4d7},
doi = {10.4028/0-87849-971-7.357},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {357-362},
abstract = {A new polymer of o-tolidine was synthesized by chemical and electrochemical methods from its aqueous solutions in 1M HCl. Chemical oxidative polymerization was performed using ammonium peroxydisulfate as an oxidant. Electrochemical polymerization was carried out using two steps which were successively repeated in a continual process: first, holding the working platinum electrode under a constant anodic potential of+1.6 V, and second, the voltammetric cycle between +0.3 and +1.6 V. During this procedure a polymeric film was formed on the working electrode. Polymerization of o-tolidine was exactly proved by gel permeation chromatography evidencing the chains of molar masses in the range of 1000 - 12600 g mol-1. The structure of poly(o-tolidines) obtained by both chemical and electrochemical procedures was studied by IR spectroscopy. Coupling pathway N-C during polymerization, existence of quinonoid rings and hydrogen bonding involving NH group in polymeric products are revealed by IR spectroscopic analysis. The mechanism of o-tolidine oxidative polymerization is proposed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A new polymer of o-tolidine was synthesized by chemical and electrochemical methods from its aqueous solutions in 1M HCl. Chemical oxidative polymerization was performed using ammonium peroxydisulfate as an oxidant. Electrochemical polymerization was carried out using two steps which were successively repeated in a continual process: first, holding the working platinum electrode under a constant anodic potential of+1.6 V, and second, the voltammetric cycle between +0.3 and +1.6 V. During this procedure a polymeric film was formed on the working electrode. Polymerization of o-tolidine was exactly proved by gel permeation chromatography evidencing the chains of molar masses in the range of 1000 - 12600 g mol-1. The structure of poly(o-tolidines) obtained by both chemical and electrochemical procedures was studied by IR spectroscopy. Coupling pathway N-C during polymerization, existence of quinonoid rings and hydrogen bonding involving NH group in polymeric products are revealed by IR spectroscopic analysis. The mechanism of o-tolidine oxidative polymerization is proposed.
Krstić, J; Vukelić, N; Nedić, Z; Milutinovic-Nikolić, A; Šućurović, A; Jovanović, D
Nickel/silica precursor from sodium silicate solution - Synthesis and characterization Journal Article
In: Materials Science Forum, vol. 494, pp. 333-338, 2005.
@article{Krstić2005333,
title = {Nickel/silica precursor from sodium silicate solution - Synthesis and characterization},
author = {J Krstić and N Vukelić and Z Nedić and A Milutinovic-Nikolić and A Šućurović and D Jovanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-35248833651&doi=10.4028%2f0-87849-971-7.333&partnerID=40&md5=bb49a8cb494c9053712dfda5d6b36758},
doi = {10.4028/0-87849-971-7.333},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {333-338},
abstract = {The aim of this paper was the investigation of the influence of synthesis parameters, as well as the order of synthesis steps, in procedure of chemical precipitation, on the properties of synthesized nickel precursor. The starting materials were always the same aqueous solutions of Ni(NO3) 2·6H2O and Mg(NO3)2· 6H2O of constant molar ratio, 2% solution of SiO2 in the form of sodium silicate solution (module SiO2/Na2O = 3.0) and 10% solution of Na2CO3, while synthesis steps and addition modes were varied. Complete pH and temperature monitoring was performed during entire synthesis at 90°C. The formed precipitate aged 30 minutes at synthesis temperature. By changing the order and conditions of adding SiO 2 and Na2CO3 solutions and keeping the treatment of precipitates the same (rinsing with hot distilled water followed by drying at 110°C for 24 hours) six different precursors were obtained. Samples characterizations were performed using different experimental techniques: XRD analysis, IR spectroscopy, reflection spectroscopy, TG analysis, N2 physisorption. The relation between synthesis procedure and precursor properties was established.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The aim of this paper was the investigation of the influence of synthesis parameters, as well as the order of synthesis steps, in procedure of chemical precipitation, on the properties of synthesized nickel precursor. The starting materials were always the same aqueous solutions of Ni(NO3) 2·6H2O and Mg(NO3)2· 6H2O of constant molar ratio, 2% solution of SiO2 in the form of sodium silicate solution (module SiO2/Na2O = 3.0) and 10% solution of Na2CO3, while synthesis steps and addition modes were varied. Complete pH and temperature monitoring was performed during entire synthesis at 90°C. The formed precipitate aged 30 minutes at synthesis temperature. By changing the order and conditions of adding SiO 2 and Na2CO3 solutions and keeping the treatment of precipitates the same (rinsing with hot distilled water followed by drying at 110°C for 24 hours) six different precursors were obtained. Samples characterizations were performed using different experimental techniques: XRD analysis, IR spectroscopy, reflection spectroscopy, TG analysis, N2 physisorption. The relation between synthesis procedure and precursor properties was established.
Dondur, V; Dimitrijević, R; Kremenović, A; Damjanović, Lj.; Kićanović, M; Cheong, H M; Macura, S
Phase transformation of hexacelsians doped with Li, Na and Ca Journal Article
In: Materials Science Forum, vol. 494, pp. 107-112, 2005.
@article{Dondur2005107,
title = {Phase transformation of hexacelsians doped with Li, Na and Ca},
author = {V Dondur and R Dimitrijević and A Kremenović and Lj. Damjanović and M Kićanović and H M Cheong and S Macura},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34548537839&doi=10.4028%2f0-87849-971-7.107&partnerID=40&md5=84c12381d4f5ab90b2df0a7642624363},
doi = {10.4028/0-87849-971-7.107},
year = {2005},
date = {2005-01-01},
journal = {Materials Science Forum},
volume = {494},
pages = {107-112},
abstract = {A series of hexacelsians with different compositions were synthesized by thermally induced transformation of a LTA zeolite. Various forms of hexacelsians have been characterized by XRPD, IR, Raman and 29Si MAS NMR method. The phase transformation α→β hexacelsian was investigated by DSC method. This phase transformation is sensitive to synthesis conditions, doping and thermal treatment. The peak maximum temperature, Tm, varies from 302 up to 353 °C. Heat of transformation changes from 0.42 to 1.77 kJ/mol.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A series of hexacelsians with different compositions were synthesized by thermally induced transformation of a LTA zeolite. Various forms of hexacelsians have been characterized by XRPD, IR, Raman and 29Si MAS NMR method. The phase transformation α→β hexacelsian was investigated by DSC method. This phase transformation is sensitive to synthesis conditions, doping and thermal treatment. The peak maximum temperature, Tm, varies from 302 up to 353 °C. Heat of transformation changes from 0.42 to 1.77 kJ/mol.
Radotić, K; Mićić, M; Jeremić, M
Scanning Probe Microscopy of Plant Cell Wall and Its Constituents Book
2005.
@book{Radotić200595,
title = {Scanning Probe Microscopy of Plant Cell Wall and Its Constituents},
author = {K Radotić and M Mićić and M Jeremić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-79955102041&doi=10.1002%2f0470007702.ch6&partnerID=40&md5=90e6dc109204341e053c24a6a8c3eb73},
doi = {10.1002/0470007702.ch6},
year = {2005},
date = {2005-01-01},
journal = {Force Microscopy: Applications in Biology and Medicine},
pages = {95-112},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
Miodragović, Dj. U.; Miodragović, Z M; Skala, D; Malinar, M J; Minić, D M; Andjelković, K
In: Thermochimica Acta, vol. 436, no. 1-2, pp. 90-95, 2005.
@article{Miodragović200590,
title = {Mixed cobalt(III) complexes with aromatic amino acids and diamine: Part V. Thermal investigation of (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex diastereomers},
author = {Dj.U. Miodragović and Z M Miodragović and D Skala and M J Malinar and D M Minić and K Andjelković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24344482084&doi=10.1016%2fj.tca.2004.07.007&partnerID=40&md5=75a55123a656f7bda64a063edb4eabdf},
doi = {10.1016/j.tca.2004.07.007},
year = {2005},
date = {2005-01-01},
journal = {Thermochimica Acta},
volume = {436},
number = {1-2},
pages = {90-95},
abstract = {Thermal properties of (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex diastereomers are investigated by means of TG technique in 293-873 K temperature range. This is a first thermal study of [Co(S-aa) 2 en] + (S-aa = anion of S-amino acid; en = 1,2-diaminoethane) complex diastereomers. It is shown that thermal decompositions of these complexes are multi-step degradation processes, which in some cases can be satisfactory separated into individual steps, depending on the molecular symmetry. It is proposed that the degradation processes occur with cleavage of the side chain of one S-tyrosinato ligand, followed by the cleavage of the second side chain by further heating. The proposed pathways of decomposition are in accordance with results of thermal degradation of noncoordinated S-tyrosine [F. Rodante, G. Marrosu, G. Catalani, Thermochim. Acta 194 (1992) 197-213]. In the case of diastereomers which crystallize with water molecules, the departure of both hygroscopic and crystal water occurs before. The corresponding kinetic and thermodynamic parameters of some processes were determined. © 2004 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thermal properties of (1,2-diaminoethane)bis(S-tyrosinato)cobalt(III) complex diastereomers are investigated by means of TG technique in 293-873 K temperature range. This is a first thermal study of [Co(S-aa) 2 en] + (S-aa = anion of S-amino acid; en = 1,2-diaminoethane) complex diastereomers. It is shown that thermal decompositions of these complexes are multi-step degradation processes, which in some cases can be satisfactory separated into individual steps, depending on the molecular symmetry. It is proposed that the degradation processes occur with cleavage of the side chain of one S-tyrosinato ligand, followed by the cleavage of the second side chain by further heating. The proposed pathways of decomposition are in accordance with results of thermal degradation of noncoordinated S-tyrosine [F. Rodante, G. Marrosu, G. Catalani, Thermochim. Acta 194 (1992) 197-213]. In the case of diastereomers which crystallize with water molecules, the departure of both hygroscopic and crystal water occurs before. The corresponding kinetic and thermodynamic parameters of some processes were determined. © 2004 Elsevier B.V. All rights reserved.
Čajkovski, T; Davidović, M; Pissis, P; Polizos, G; Čajkovski, D; Likar-Smiljanić, V; Sredić, S; Mioč, U B
Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid Journal Article
In: Journal of Non-Crystalline Solids, vol. 351, no. 33-36 SPEC. ISS., pp. 2842-2848, 2005.
@article{Čajkovski20052842,
title = {Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid},
author = {T Čajkovski and M Davidović and P Pissis and G Polizos and D Čajkovski and V Likar-Smiljanić and S Sredić and U B Mioč},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24344469654&doi=10.1016%2fj.jnoncrysol.2005.05.032&partnerID=40&md5=3b3bcaab5935f45a70839b3d49511018},
doi = {10.1016/j.jnoncrysol.2005.05.032},
year = {2005},
date = {2005-01-01},
journal = {Journal of Non-Crystalline Solids},
volume = {351},
number = {33-36 SPEC. ISS.},
pages = {2842-2848},
abstract = {Aluminum-pillared montmorillonite (PILC MM) was doped with 12-tungstophosphoric acid hexahydrate (WPA-6) by the sol-gel method. Using broad band dielectric relaxation spectroscopy (DRS), electrical properties of the obtained material were investigated. Thermally stimulated depolarization current technique was also used due to its high sensitivity and high resolving power. It has been established that pillared montmorillonite doped with WPA-6 (H 3PW12O40 • 6H2O) shows conductivity higher than that of the pure components. Phase transition, which in WPA-6 takes place above 50 °C, in doped montmorillonite occurs above 70 °C. The conductivity activation energy is 0.27 eV. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Aluminum-pillared montmorillonite (PILC MM) was doped with 12-tungstophosphoric acid hexahydrate (WPA-6) by the sol-gel method. Using broad band dielectric relaxation spectroscopy (DRS), electrical properties of the obtained material were investigated. Thermally stimulated depolarization current technique was also used due to its high sensitivity and high resolving power. It has been established that pillared montmorillonite doped with WPA-6 (H 3PW12O40 • 6H2O) shows conductivity higher than that of the pure components. Phase transition, which in WPA-6 takes place above 50 °C, in doped montmorillonite occurs above 70 °C. The conductivity activation energy is 0.27 eV. © 2005 Elsevier B.V. All rights reserved.
Stanisavljev, D R; Djordjević, A R; Likar-Smiljanić, V D
Investigation of microwave effects on the oscillatory Bray-Liebhafsky reaction Journal Article
In: Chemical Physics Letters, vol. 412, no. 4-6, pp. 420-424, 2005.
@article{Stanisavljev2005420,
title = {Investigation of microwave effects on the oscillatory Bray-Liebhafsky reaction},
author = {D R Stanisavljev and A R Djordjević and V D Likar-Smiljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-23944442696&doi=10.1016%2fj.cplett.2005.07.027&partnerID=40&md5=39e688132ec8b0a6bcb378979fff365f},
doi = {10.1016/j.cplett.2005.07.027},
year = {2005},
date = {2005-01-01},
journal = {Chemical Physics Letters},
volume = {412},
number = {4-6},
pages = {420-424},
abstract = {A specific control of the Bray-Liebhafsky oscillatory reaction is achieved by changing the microwave (MW) participation in heating the reaction mixture. Experiments are performed at temperatures Trm = 62, 65, 68 °C. Before the bifurcation point, increased MW participation has no effect on the reaction mechanism. In the sensitive state close to the bifurcation point, increased MW participation stops the oscillatory evolution. To explain the reaction dynamics in the MW field, we consider classical causes (overheating and convection effects) in contrast to some specific effects of the MW heating. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A specific control of the Bray-Liebhafsky oscillatory reaction is achieved by changing the microwave (MW) participation in heating the reaction mixture. Experiments are performed at temperatures Trm = 62, 65, 68 °C. Before the bifurcation point, increased MW participation has no effect on the reaction mechanism. In the sensitive state close to the bifurcation point, increased MW participation stops the oscillatory evolution. To explain the reaction dynamics in the MW field, we consider classical causes (overheating and convection effects) in contrast to some specific effects of the MW heating. © 2005 Elsevier B.V. All rights reserved.
Stojić, D. Lj.; Maksić, A D; Kaninski, M P M; Cekić, B D; Miljanić, S S
Improved energy efficiency of the electrolytic evolution of hydrogen - Comparison of conventional and advanced electrode materials Journal Article
In: Journal of Power Sources, vol. 145, no. 2, pp. 278-281, 2005.
@article{Stojić2005278,
title = {Improved energy efficiency of the electrolytic evolution of hydrogen - Comparison of conventional and advanced electrode materials},
author = {D.Lj. Stojić and A D Maksić and M P M Kaninski and B D Cekić and S S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-23844432661&doi=10.1016%2fj.jpowsour.2004.12.077&partnerID=40&md5=4654b79fb101a7c6d2e68645fa3d5640},
doi = {10.1016/j.jpowsour.2004.12.077},
year = {2005},
date = {2005-01-01},
journal = {Journal of Power Sources},
volume = {145},
number = {2},
pages = {278-281},
abstract = {With the idea to improve the efficiency of the electrolytic production of hydrogen by electrolysis, from water KOH solutions, the intermetallic Hf 2 Co was investigated as cathode. This cathode was used single or in combination with ionic activators, and compared with several intermetallics previously investigated: Hf 2 Fe, TiPt, and PtMo 3 . A comparison with conventional cathode, nickel, was also evaluated. An significant upgrade of the electrolytic efficiency using intermetallics was achieved in comparison with conventional cathode materials. The influence of ionic activators on the process efficiency was significant, too. The effects of those cathode materials on the electrolytic evolution of hydrogen were discussed in the context of transition metals features that issue from their electronic configuration. © 2005 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
With the idea to improve the efficiency of the electrolytic production of hydrogen by electrolysis, from water KOH solutions, the intermetallic Hf 2 Co was investigated as cathode. This cathode was used single or in combination with ionic activators, and compared with several intermetallics previously investigated: Hf 2 Fe, TiPt, and PtMo 3 . A comparison with conventional cathode, nickel, was also evaluated. An significant upgrade of the electrolytic efficiency using intermetallics was achieved in comparison with conventional cathode materials. The influence of ionic activators on the process efficiency was significant, too. The effects of those cathode materials on the electrolytic evolution of hydrogen were discussed in the context of transition metals features that issue from their electronic configuration. © 2005 Elsevier B.V. All rights reserved.
Mladenović, M; Perić, M; Engels, B
In: Journal of Chemical Physics, vol. 122, no. 20, 2005.
@article{Mladenović2005,
title = {Erratum: An ab initio calculation of the anisotropic hyperfine coupling constants in the low-lying vibronic levels of the X 2 ∏ electronic state of CCCH (J. Chem. Phys. (2004) 121 (12361))},
author = {M Mladenović and M Perić and B Engels},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-20844461945&doi=10.1063%2f1.1903948&partnerID=40&md5=5698e0c14859fc88ce742f5b26626072},
doi = {10.1063/1.1903948},
year = {2005},
date = {2005-01-01},
journal = {Journal of Chemical Physics},
volume = {122},
number = {20},
keywords = {},
pubstate = {published},
tppubtype = {article}
}