TY  - JOUR
AU  - Petrović, Rada
AU  - Tanasković, N.
AU  - Đokić, Veljko
AU  - Radovanović, Željko
AU  - Janković-Častvan, Ivona
AU  - Stamenković, Ivan
AU  - Janaćković, Đorđe
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2193
AB  - Titania powders were synthesized by nonhydrolitic sol-gel process starting from titanium(IV)-chloride, titanium(IV)-isopropoxide and carbon-tetrachloride. Gelation was performed in solvothermal conditions, at 140 degrees C or 160 degrees C. The obtained gels were then dried and calcined at 500 degrees C or 750 degrees C. Dry gels and powders obtained by their calcination at 500 degrees C contained only anatase, and the degree of crystallinity increased notably on passing from the dry gels to the powders. The crystallite size of dry gels and powders obtained at 500 degrees C increased slightly with increasing temperature of the gelation. The powder obtained at the higher gelation temperature had a larger specific surface area (52.8 m(2) g(-1)) and a smaller maximum pore diameter (12.3 nm). When the calcination temperature was increased to 750 degrees C, the obtained powders contained both anatase and rutile. The rutile content in the powders is related to the degree of crystallinity of the dry gels: with a lower level of dry gel crystallinity, the rutile content in the powders becomes higher, indicating that the temperature of the anatase - gt  rutile transformation decreases with decreasing the size of anatase crystallites. The photocatalytic activity of the powders obtained by gel calcination at 500 degrees C, tested by measuring the photocatalytic degradation of the azo dye CI Reactive orange 16, was sufficiently high and attained the photocatalytic activity of the broadly accepted commercial powder P-25 produced by Degussa. The photocatalytic activity of the powders obtained by calcination at 750 degrees C was low, but showed a tendency to increase with higher anatase content in the powders.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process
EP  - 243
SP  - 239
VL  - 219
DO  - 10.1016/j.powtec.2011.12.049
ER  - 

@article{
author = "Petrović, Rada and Tanasković, N. and Đokić, Veljko and Radovanović, Željko and Janković-Častvan, Ivona and Stamenković, Ivan and Janaćković, Đorđe",
year = "2012",
abstract = "Titania powders were synthesized by nonhydrolitic sol-gel process starting from titanium(IV)-chloride, titanium(IV)-isopropoxide and carbon-tetrachloride. Gelation was performed in solvothermal conditions, at 140 degrees C or 160 degrees C. The obtained gels were then dried and calcined at 500 degrees C or 750 degrees C. Dry gels and powders obtained by their calcination at 500 degrees C contained only anatase, and the degree of crystallinity increased notably on passing from the dry gels to the powders. The crystallite size of dry gels and powders obtained at 500 degrees C increased slightly with increasing temperature of the gelation. The powder obtained at the higher gelation temperature had a larger specific surface area (52.8 m(2) g(-1)) and a smaller maximum pore diameter (12.3 nm). When the calcination temperature was increased to 750 degrees C, the obtained powders contained both anatase and rutile. The rutile content in the powders is related to the degree of crystallinity of the dry gels: with a lower level of dry gel crystallinity, the rutile content in the powders becomes higher, indicating that the temperature of the anatase - gt  rutile transformation decreases with decreasing the size of anatase crystallites. The photocatalytic activity of the powders obtained by gel calcination at 500 degrees C, tested by measuring the photocatalytic degradation of the azo dye CI Reactive orange 16, was sufficiently high and attained the photocatalytic activity of the broadly accepted commercial powder P-25 produced by Degussa. The photocatalytic activity of the powders obtained by calcination at 750 degrees C was low, but showed a tendency to increase with higher anatase content in the powders.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process",
pages = "243-239",
volume = "219",
doi = "10.1016/j.powtec.2011.12.049"
}

Petrović, R., Tanasković, N., Đokić, V., Radovanović, Ž., Janković-Častvan, I., Stamenković, I.,& Janaćković, Đ.. (2012). Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process. in Powder Technology
Elsevier, Amsterdam., 219, 239-243.
https://doi.org/10.1016/j.powtec.2011.12.049

Petrović R, Tanasković N, Đokić V, Radovanović Ž, Janković-Častvan I, Stamenković I, Janaćković Đ. Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process. in Powder Technology. 2012;219:239-243.
doi:10.1016/j.powtec.2011.12.049 .

Petrović, Rada, Tanasković, N., Đokić, Veljko, Radovanović, Željko, Janković-Častvan, Ivona, Stamenković, Ivan, Janaćković, Đorđe, "Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process" in Powder Technology, 219 (2012):239-243,
https://doi.org/10.1016/j.powtec.2011.12.049 . .

TY  - JOUR
AU  - Jokić, Bojan
AU  - Stamenković, Ivan
AU  - Zrilić, Milorad
AU  - Obradović-Đuričić, Kosovka
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2248
AB  - In this study, spherical particles of hydroxyapatite (HA) and alpha-tricalcium phosphate (alpha-Ca-3(PO4)(2): alpha-TCP) doped with different amounts of silicon were used for the preparation of scaffolds. The scaffolds were obtained by a replica foam method using particles of narrow size distribution pre-annealed at 1150 degrees C with different alpha-TCP and HA contents in order to investigate the effect of composition on their morphological and mechanical properties. Morphology, size, and distribution of the particles were characterized using scanning electron microscopy and particle size analyzer. The obtained alpha-TCP-HA scaffolds had compressive strengths up to 5.7 MPa with a uniform and interconnected porous structure. X-ray diffraction analysis used to determine the crystal structure of the scaffolds confirmed that the alpha-TCP-HA content could be controlled by the amount of silicon ions.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles
EP  - 158
SP  - 155
VL  - 74
DO  - 10.1016/j.matlet.2012.01.081
ER  - 

@article{
author = "Jokić, Bojan and Stamenković, Ivan and Zrilić, Milorad and Obradović-Đuričić, Kosovka and Petrović, Rada and Janaćković, Đorđe",
year = "2012",
abstract = "In this study, spherical particles of hydroxyapatite (HA) and alpha-tricalcium phosphate (alpha-Ca-3(PO4)(2): alpha-TCP) doped with different amounts of silicon were used for the preparation of scaffolds. The scaffolds were obtained by a replica foam method using particles of narrow size distribution pre-annealed at 1150 degrees C with different alpha-TCP and HA contents in order to investigate the effect of composition on their morphological and mechanical properties. Morphology, size, and distribution of the particles were characterized using scanning electron microscopy and particle size analyzer. The obtained alpha-TCP-HA scaffolds had compressive strengths up to 5.7 MPa with a uniform and interconnected porous structure. X-ray diffraction analysis used to determine the crystal structure of the scaffolds confirmed that the alpha-TCP-HA content could be controlled by the amount of silicon ions.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles",
pages = "158-155",
volume = "74",
doi = "10.1016/j.matlet.2012.01.081"
}

Jokić, B., Stamenković, I., Zrilić, M., Obradović-Đuričić, K., Petrović, R.,& Janaćković, Đ.. (2012). Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles. in Materials Letters
Elsevier Science Bv, Amsterdam., 74, 155-158.
https://doi.org/10.1016/j.matlet.2012.01.081

Jokić B, Stamenković I, Zrilić M, Obradović-Đuričić K, Petrović R, Janaćković Đ. Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles. in Materials Letters. 2012;74:155-158.
doi:10.1016/j.matlet.2012.01.081 .

Jokić, Bojan, Stamenković, Ivan, Zrilić, Milorad, Obradović-Đuričić, Kosovka, Petrović, Rada, Janaćković, Đorđe, "Silicon-doped biphasic alpha-calcium-phosphate/hydroxyapatite scaffolds obtained by a replica foam method using uniform pre-annealed spherical particles" in Materials Letters, 74 (2012):155-158,
https://doi.org/10.1016/j.matlet.2012.01.081 . .