TY  - JOUR
AU  - Petrović, R.
AU  - Milonjić, Slobodan K.
AU  - Jokanović, Vukoman
AU  - Kostić-Gvozdenović, Ljiljana
AU  - Petrović-Prelević, I
AU  - Janaćković, Đorđe
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/528
AB  - Influence of the type and amount of acid, used for aluminium hydroxide peptization, on the crystallinity and specific surface area of the dispersed phase of boehmite sols as well as the pH of sols, was investigated. The ratio n(HCl)/n(Al(OH)(3))=0.1 was found to be optimum for aluminium hydroxide peptization. Higher acid to aluminium hydroxide ratio leads to a decrease in specific surface area and crystallinity of the solid phase as well as in pH of sols. Increase in counter ion (Cl-) concentration causes a shift in d values of (020) crystallographic plane, from the value corresponding to boehmite to that for pseudoboehmite, and a decrease in specific surface area of the sol solid phase. Using HNO3 as a peptizing agent, greater crystallinity and higher specific surface area values of the solids were registered.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Influence of synthesis parameters on the structure of boehmite sol particles
EP  - 189
IS  - 1-3
SP  - 185
VL  - 133
DO  - 10.1016/S0032-5910(03)00091-3
ER  - 

@article{
author = "Petrović, R. and Milonjić, Slobodan K. and Jokanović, Vukoman and Kostić-Gvozdenović, Ljiljana and Petrović-Prelević, I and Janaćković, Đorđe",
year = "2003",
abstract = "Influence of the type and amount of acid, used for aluminium hydroxide peptization, on the crystallinity and specific surface area of the dispersed phase of boehmite sols as well as the pH of sols, was investigated. The ratio n(HCl)/n(Al(OH)(3))=0.1 was found to be optimum for aluminium hydroxide peptization. Higher acid to aluminium hydroxide ratio leads to a decrease in specific surface area and crystallinity of the solid phase as well as in pH of sols. Increase in counter ion (Cl-) concentration causes a shift in d values of (020) crystallographic plane, from the value corresponding to boehmite to that for pseudoboehmite, and a decrease in specific surface area of the sol solid phase. Using HNO3 as a peptizing agent, greater crystallinity and higher specific surface area values of the solids were registered.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Influence of synthesis parameters on the structure of boehmite sol particles",
pages = "189-185",
number = "1-3",
volume = "133",
doi = "10.1016/S0032-5910(03)00091-3"
}

Petrović, R., Milonjić, S. K., Jokanović, V., Kostić-Gvozdenović, L., Petrović-Prelević, I.,& Janaćković, Đ.. (2003). Influence of synthesis parameters on the structure of boehmite sol particles. in Powder Technology
Elsevier, Amsterdam., 133(1-3), 185-189.
https://doi.org/10.1016/S0032-5910(03)00091-3

Petrović R, Milonjić SK, Jokanović V, Kostić-Gvozdenović L, Petrović-Prelević I, Janaćković Đ. Influence of synthesis parameters on the structure of boehmite sol particles. in Powder Technology. 2003;133(1-3):185-189.
doi:10.1016/S0032-5910(03)00091-3 .

Petrović, R., Milonjić, Slobodan K., Jokanović, Vukoman, Kostić-Gvozdenović, Ljiljana, Petrović-Prelević, I, Janaćković, Đorđe, "Influence of synthesis parameters on the structure of boehmite sol particles" in Powder Technology, 133, no. 1-3 (2003):185-189,
https://doi.org/10.1016/S0032-5910(03)00091-3 . .

TY  - JOUR
AU  - Janaćković, Đorđe
AU  - Petrović-Prelević, I
AU  - Kostić-Gvozdenović, Ljiljana
AU  - Petrović, R.
AU  - Jokanović, Vukoman
AU  - Uskoković, Dragan
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/346
AB  - In this paper the synthesis of biocompatible calcium-hydroxyapatite particles, chemically and morphologically similar to the mineral particles in human bones, is presented. The influence of synthesis parameters: temperature, pH, concentrations of solution and time on the particle size and morphology of nanostructured Ca-hydroxyapatite were investigated. The obtained results show that in the temperature range between 125 to 160 degreesC the particle sizes decreased from 31.7 to 25.2 nm in the 001 plane, but increased at 180 degreesC to 45 nm, while in h00 planes they increased from 15.8 to 26.2 nm with the temperature rising. The changes in pH values of solution do not have a great influence on crystallite size. In the samples where the concentration of starting solutions is increased, the enlargement in particle sizes from 25.2 to 46.7 nm in the 001 planes is observed, while in the h00 planes, particle sizes are changed sligthtly. It was found that the prolonged time of the reaction has a great influence on crystallite size leading to the increase in the size in the 001 plane. The changes in the crystal cell parameters a and c and FTIR analysis, due to variations of synthesis parameters, can be a consequence of the CO32- ions incorporated into the crystal structure of hydroxyapatite.
PB  - 13th international Symposium on Ceramics in Medicine (BIOCERAMICS)
T2  - Key Engineering Materials
T1  - Influence of synthesis parameters on the particle sizes of nanostructured calcium-hydroxyapatite
EP  - 206
SP  - 203
VL  - 192-195
UR  - https://hdl.handle.net/21.15107/rcub_technorep_346
ER  - 

@article{
author = "Janaćković, Đorđe and Petrović-Prelević, I and Kostić-Gvozdenović, Ljiljana and Petrović, R. and Jokanović, Vukoman and Uskoković, Dragan",
year = "2001",
abstract = "In this paper the synthesis of biocompatible calcium-hydroxyapatite particles, chemically and morphologically similar to the mineral particles in human bones, is presented. The influence of synthesis parameters: temperature, pH, concentrations of solution and time on the particle size and morphology of nanostructured Ca-hydroxyapatite were investigated. The obtained results show that in the temperature range between 125 to 160 degreesC the particle sizes decreased from 31.7 to 25.2 nm in the 001 plane, but increased at 180 degreesC to 45 nm, while in h00 planes they increased from 15.8 to 26.2 nm with the temperature rising. The changes in pH values of solution do not have a great influence on crystallite size. In the samples where the concentration of starting solutions is increased, the enlargement in particle sizes from 25.2 to 46.7 nm in the 001 planes is observed, while in the h00 planes, particle sizes are changed sligthtly. It was found that the prolonged time of the reaction has a great influence on crystallite size leading to the increase in the size in the 001 plane. The changes in the crystal cell parameters a and c and FTIR analysis, due to variations of synthesis parameters, can be a consequence of the CO32- ions incorporated into the crystal structure of hydroxyapatite.",
publisher = "13th international Symposium on Ceramics in Medicine (BIOCERAMICS)",
journal = "Key Engineering Materials",
title = "Influence of synthesis parameters on the particle sizes of nanostructured calcium-hydroxyapatite",
pages = "206-203",
volume = "192-195",
url = "https://hdl.handle.net/21.15107/rcub_technorep_346"
}

Janaćković, Đ., Petrović-Prelević, I., Kostić-Gvozdenović, L., Petrović, R., Jokanović, V.,& Uskoković, D.. (2001). Influence of synthesis parameters on the particle sizes of nanostructured calcium-hydroxyapatite. in Key Engineering Materials
13th international Symposium on Ceramics in Medicine (BIOCERAMICS)., 192-195, 203-206.
https://hdl.handle.net/21.15107/rcub_technorep_346

Janaćković Đ, Petrović-Prelević I, Kostić-Gvozdenović L, Petrović R, Jokanović V, Uskoković D. Influence of synthesis parameters on the particle sizes of nanostructured calcium-hydroxyapatite. in Key Engineering Materials. 2001;192-195:203-206.
https://hdl.handle.net/21.15107/rcub_technorep_346 .

Janaćković, Đorđe, Petrović-Prelević, I, Kostić-Gvozdenović, Ljiljana, Petrović, R., Jokanović, Vukoman, Uskoković, Dragan, "Influence of synthesis parameters on the particle sizes of nanostructured calcium-hydroxyapatite" in Key Engineering Materials, 192-195 (2001):203-206,
https://hdl.handle.net/21.15107/rcub_technorep_346 .

TY  - JOUR
AU  - Janaćković, Đorđe
AU  - Jokanović, Vukoman
AU  - Kostić-Gvozdenović, Ljiljana
AU  - Cirjaković, R.
AU  - Petrović-Prelević, Irena
AU  - Uskoković, Dragan
PY  - 1997
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/117
AB  - In this paper synthesis of spinel powders by the two-fluid spray pyrolysis method was performed. The influence of the precursors (AlCl3·9H2O and MgCl2·6H2O for S-1 powder and boehmite sol and MgCl2·6H2O for S-2 powder) on the spinel synthesis, particle morphology and phase transformation was investigated using SEM, X-ray and DT/TG analyses. From the obtained results its evident that precursors have a great influence on the particles morphology: Particles obtained from the salt solution (S-1) were hollow as a consequence of surface precipitation, while particles obtained from the sol were solid spheres due to continual boehmite gel formation. From the DT, TG, and X-ray diffraction analyses of spinel powders can be concluded that formation of spinel phase is evident in both samples heated at the temperature below 500°C during 2 hours. In the case of S-1 powder heated at 1000°C synthesis of spinel is completed, while in the case of S-2, presence of periclas diffraction peaks indicates that the reaction of spinel phase synthesis is not finished. Existence of periclas phase is a consequence of phase separation during synthesis due to presence of discrete boehmite particles as a precursor.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Key Engineering Materials
T1  - Synthesis of spinel powders by the spray pyrolysis method
EP  - 200
SP  - 197
VL  - 132-136
DO  - 10.4028/www.scientific.net/KEM.132-136.197
UR  - https://hdl.handle.net/21.15107/rcub_technorep_117
ER  - 

@article{
author = "Janaćković, Đorđe and Jokanović, Vukoman and Kostić-Gvozdenović, Ljiljana and Cirjaković, R. and Petrović-Prelević, Irena and Uskoković, Dragan",
year = "1997",
abstract = "In this paper synthesis of spinel powders by the two-fluid spray pyrolysis method was performed. The influence of the precursors (AlCl3·9H2O and MgCl2·6H2O for S-1 powder and boehmite sol and MgCl2·6H2O for S-2 powder) on the spinel synthesis, particle morphology and phase transformation was investigated using SEM, X-ray and DT/TG analyses. From the obtained results its evident that precursors have a great influence on the particles morphology: Particles obtained from the salt solution (S-1) were hollow as a consequence of surface precipitation, while particles obtained from the sol were solid spheres due to continual boehmite gel formation. From the DT, TG, and X-ray diffraction analyses of spinel powders can be concluded that formation of spinel phase is evident in both samples heated at the temperature below 500°C during 2 hours. In the case of S-1 powder heated at 1000°C synthesis of spinel is completed, while in the case of S-2, presence of periclas diffraction peaks indicates that the reaction of spinel phase synthesis is not finished. Existence of periclas phase is a consequence of phase separation during synthesis due to presence of discrete boehmite particles as a precursor.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Key Engineering Materials",
title = "Synthesis of spinel powders by the spray pyrolysis method",
pages = "200-197",
volume = "132-136",
doi = "10.4028/www.scientific.net/KEM.132-136.197",
url = "https://hdl.handle.net/21.15107/rcub_technorep_117"
}

Janaćković, Đ., Jokanović, V., Kostić-Gvozdenović, L., Cirjaković, R., Petrović-Prelević, I.,& Uskoković, D.. (1997). Synthesis of spinel powders by the spray pyrolysis method. in Key Engineering Materials
Trans Tech Publications Ltd, Durnten-Zurich., 132-136, 197-200.
https://doi.org/10.4028/www.scientific.net/KEM.132-136.197
https://hdl.handle.net/21.15107/rcub_technorep_117

Janaćković Đ, Jokanović V, Kostić-Gvozdenović L, Cirjaković R, Petrović-Prelević I, Uskoković D. Synthesis of spinel powders by the spray pyrolysis method. in Key Engineering Materials. 1997;132-136:197-200.
doi:10.4028/www.scientific.net/KEM.132-136.197
https://hdl.handle.net/21.15107/rcub_technorep_117 .

Janaćković, Đorđe, Jokanović, Vukoman, Kostić-Gvozdenović, Ljiljana, Cirjaković, R., Petrović-Prelević, Irena, Uskoković, Dragan, "Synthesis of spinel powders by the spray pyrolysis method" in Key Engineering Materials, 132-136 (1997):197-200,
https://doi.org/10.4028/www.scientific.net/KEM.132-136.197 .,
https://hdl.handle.net/21.15107/rcub_technorep_117 .

TY  - JOUR
AU  - Talijan, Nadežda
AU  - Milutinović-Nikolić, Aleksandra
AU  - Jančić, Radmila
AU  - Petrović-Prelević, I
AU  - Stajić-Trošić, Jasna
PY  - 1997
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/125
AB  - The purpose of this investigation was to establish the correlation between the sintering conditions (temperature and time) and the stability of the SmCo5 phase, expressed by the intensity of its most important diffraction peak. The sintering and heat treatment was performed under a vacuum of 150 Pa. Sintering was investigated in the temperature interval from 1100 to 1180 degrees C, for sintering times of 30, 45 and 60 min, while the temperature and duration of the heat treatment were kept constant. The content of the SmCo5 phase, as the carrier of the magnetic properties, was observed by X-ray diffraction analysis of the polycrystalline specimens. It was established that there is a dependence of the intensity of the diffraction peak, which corresponds to the (111) plane of the SmCo5 phase, on the sintering time and temperature. A regression model was obtained that showed the intensity of the diffraction peak to be dependent upon squares of both the sintering time and temperature.
PB  - Elsevier, Amsterdam
T2  - Materials Letters
T1  - The influence of the sintering regime on the stability of the SmCo5 phase
EP  - 89
IS  - 2-3
SP  - 85
VL  - 32
DO  - 10.1016/S0167-577X(97)00017-7
ER  - 

@article{
author = "Talijan, Nadežda and Milutinović-Nikolić, Aleksandra and Jančić, Radmila and Petrović-Prelević, I and Stajić-Trošić, Jasna",
year = "1997",
abstract = "The purpose of this investigation was to establish the correlation between the sintering conditions (temperature and time) and the stability of the SmCo5 phase, expressed by the intensity of its most important diffraction peak. The sintering and heat treatment was performed under a vacuum of 150 Pa. Sintering was investigated in the temperature interval from 1100 to 1180 degrees C, for sintering times of 30, 45 and 60 min, while the temperature and duration of the heat treatment were kept constant. The content of the SmCo5 phase, as the carrier of the magnetic properties, was observed by X-ray diffraction analysis of the polycrystalline specimens. It was established that there is a dependence of the intensity of the diffraction peak, which corresponds to the (111) plane of the SmCo5 phase, on the sintering time and temperature. A regression model was obtained that showed the intensity of the diffraction peak to be dependent upon squares of both the sintering time and temperature.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Letters",
title = "The influence of the sintering regime on the stability of the SmCo5 phase",
pages = "89-85",
number = "2-3",
volume = "32",
doi = "10.1016/S0167-577X(97)00017-7"
}

Talijan, N., Milutinović-Nikolić, A., Jančić, R., Petrović-Prelević, I.,& Stajić-Trošić, J.. (1997). The influence of the sintering regime on the stability of the SmCo5 phase. in Materials Letters
Elsevier, Amsterdam., 32(2-3), 85-89.
https://doi.org/10.1016/S0167-577X(97)00017-7

Talijan N, Milutinović-Nikolić A, Jančić R, Petrović-Prelević I, Stajić-Trošić J. The influence of the sintering regime on the stability of the SmCo5 phase. in Materials Letters. 1997;32(2-3):85-89.
doi:10.1016/S0167-577X(97)00017-7 .

Talijan, Nadežda, Milutinović-Nikolić, Aleksandra, Jančić, Radmila, Petrović-Prelević, I, Stajić-Trošić, Jasna, "The influence of the sintering regime on the stability of the SmCo5 phase" in Materials Letters, 32, no. 2-3 (1997):85-89,
https://doi.org/10.1016/S0167-577X(97)00017-7 . .