TY  - JOUR
AU  - Jokić, Bojan M.
AU  - Mitrić, Miodrag
AU  - Popović, Maja
AU  - Sima, L.
AU  - Petrescu, S. M.
AU  - Petrović, R.
AU  - Janaćković, Đorđe T.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4518
AB  - In this work, the influence of the morphology of hydroxyapatite particles on silicon substitution through hydrothermal synthesis performed under the same conditions was investigated. Spherical- and whisker-like hydroxyapatite particles were obtained starting from calcium-nitrate, sodium dihydrogen phosphate, disodium-ethylenediaminetetraacetic acid and urea (used only for the synthesis of whisker-like particles) dissolved in aqueous solutions. Silicon was introduced into the solution using tetraethylorthosilicate. X-ray diffraction, infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy indicate that silicon doping induce different phase compositions and bioactivity of spherical- and whisker-like hydroxyapatite particles obtained under the same hydrothermal conditions. Silicon-substituted, spherical hydroxyapatites particles showed greater phase transformation to silicon-substituted alpha- calcium-phosphate compared with whiskers-like hydroxyapatite particles synthesized with the same amount of added silicon. Metabolic activity assay performed with SaOs2 osteosarcoma cells showed better biocompatibility of annealed biphasic spherical-like particles compared with annealed whiskerlike particles while dried spherical-like particles induce high cytotoxicity effect.
T2  - Journal of Materials Science: Materials in Medicine
T1  - The influence of silicon substitution on the properties of spherical- and whisker-like biphasic alpha-calcium-phosphate/hydroxyapatite particles
VL  - 22
IS  - 10
SP  - 2175
EP  - 2185
DO  - 10.1007/s10856-011-4412-6
ER  - 

@article{
author = "Jokić, Bojan M. and Mitrić, Miodrag and Popović, Maja and Sima, L. and Petrescu, S. M. and Petrović, R. and Janaćković, Đorđe T.",
year = "2011",
abstract = "In this work, the influence of the morphology of hydroxyapatite particles on silicon substitution through hydrothermal synthesis performed under the same conditions was investigated. Spherical- and whisker-like hydroxyapatite particles were obtained starting from calcium-nitrate, sodium dihydrogen phosphate, disodium-ethylenediaminetetraacetic acid and urea (used only for the synthesis of whisker-like particles) dissolved in aqueous solutions. Silicon was introduced into the solution using tetraethylorthosilicate. X-ray diffraction, infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy indicate that silicon doping induce different phase compositions and bioactivity of spherical- and whisker-like hydroxyapatite particles obtained under the same hydrothermal conditions. Silicon-substituted, spherical hydroxyapatites particles showed greater phase transformation to silicon-substituted alpha- calcium-phosphate compared with whiskers-like hydroxyapatite particles synthesized with the same amount of added silicon. Metabolic activity assay performed with SaOs2 osteosarcoma cells showed better biocompatibility of annealed biphasic spherical-like particles compared with annealed whiskerlike particles while dried spherical-like particles induce high cytotoxicity effect.",
journal = "Journal of Materials Science: Materials in Medicine",
title = "The influence of silicon substitution on the properties of spherical- and whisker-like biphasic alpha-calcium-phosphate/hydroxyapatite particles",
volume = "22",
number = "10",
pages = "2175-2185",
doi = "10.1007/s10856-011-4412-6"
}

Jokić, B. M., Mitrić, M., Popović, M., Sima, L., Petrescu, S. M., Petrović, R.,& Janaćković, Đ. T.. (2011). The influence of silicon substitution on the properties of spherical- and whisker-like biphasic alpha-calcium-phosphate/hydroxyapatite particles. in Journal of Materials Science: Materials in Medicine, 22(10), 2175-2185.
https://doi.org/10.1007/s10856-011-4412-6

Jokić BM, Mitrić M, Popović M, Sima L, Petrescu SM, Petrović R, Janaćković ĐT. The influence of silicon substitution on the properties of spherical- and whisker-like biphasic alpha-calcium-phosphate/hydroxyapatite particles. in Journal of Materials Science: Materials in Medicine. 2011;22(10):2175-2185.
doi:10.1007/s10856-011-4412-6 .

Jokić, Bojan M., Mitrić, Miodrag, Popović, Maja, Sima, L., Petrescu, S. M., Petrović, R., Janaćković, Đorđe T., "The influence of silicon substitution on the properties of spherical- and whisker-like biphasic alpha-calcium-phosphate/hydroxyapatite particles" in Journal of Materials Science: Materials in Medicine, 22, no. 10 (2011):2175-2185,
https://doi.org/10.1007/s10856-011-4412-6 . .

TY  - JOUR
AU  - Veljović, Đorđe N.
AU  - Zalite, I.
AU  - Palcevskis, E.
AU  - Smičiklas, Ivana D.
AU  - Petrović, R.
AU  - Janaćković, Đorđe T.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3880
AB  - The effect of microwave sintering conditions on the microstructure, phase composition and mechanical properties of materials based on hydroxyapatite (HAP) and tricalcium phosphate (TCP) was investigated. Fine grained monophase HAP and biphasic HAP/TCP biomaterials were processed starting from stoichiometric and calcium deficient nanosized HAP powders. The HAP samples microwave (MAT) sintered for 15 min at 900 degrees C, with average grain size of 130 nm, showed better densification, higher density and certainly higher hardness and fracture toughness than samples conventionally sintered for 2 h at the same temperature. By comparing MW sintered HAP and HAP/TCP samples, it was concluded that pure HAP ceramics have superior mechanical properties. For monophase MW sintered HAP samples, the decrease in the grain size from 1.59 mu m to 130 nm led to an increase in the fracture toughness from 0.85 MPa m(1/2) to 1.3 MPa m(1/2). (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Microwave sintering of fine grained HAP and HAP/TCP bioceramics
VL  - 36
IS  - 2
SP  - 595
EP  - 603
DO  - 10.1016/j.ceramint.2009.09.038
ER  - 

@article{
author = "Veljović, Đorđe N. and Zalite, I. and Palcevskis, E. and Smičiklas, Ivana D. and Petrović, R. and Janaćković, Đorđe T.",
year = "2010",
abstract = "The effect of microwave sintering conditions on the microstructure, phase composition and mechanical properties of materials based on hydroxyapatite (HAP) and tricalcium phosphate (TCP) was investigated. Fine grained monophase HAP and biphasic HAP/TCP biomaterials were processed starting from stoichiometric and calcium deficient nanosized HAP powders. The HAP samples microwave (MAT) sintered for 15 min at 900 degrees C, with average grain size of 130 nm, showed better densification, higher density and certainly higher hardness and fracture toughness than samples conventionally sintered for 2 h at the same temperature. By comparing MW sintered HAP and HAP/TCP samples, it was concluded that pure HAP ceramics have superior mechanical properties. For monophase MW sintered HAP samples, the decrease in the grain size from 1.59 mu m to 130 nm led to an increase in the fracture toughness from 0.85 MPa m(1/2) to 1.3 MPa m(1/2). (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Microwave sintering of fine grained HAP and HAP/TCP bioceramics",
volume = "36",
number = "2",
pages = "595-603",
doi = "10.1016/j.ceramint.2009.09.038"
}

Veljović, Đ. N., Zalite, I., Palcevskis, E., Smičiklas, I. D., Petrović, R.,& Janaćković, Đ. T.. (2010). Microwave sintering of fine grained HAP and HAP/TCP bioceramics. in Ceramics International, 36(2), 595-603.
https://doi.org/10.1016/j.ceramint.2009.09.038

Veljović ĐN, Zalite I, Palcevskis E, Smičiklas ID, Petrović R, Janaćković ĐT. Microwave sintering of fine grained HAP and HAP/TCP bioceramics. in Ceramics International. 2010;36(2):595-603.
doi:10.1016/j.ceramint.2009.09.038 .

Veljović, Đorđe N., Zalite, I., Palcevskis, E., Smičiklas, Ivana D., Petrović, R., Janaćković, Đorđe T., "Microwave sintering of fine grained HAP and HAP/TCP bioceramics" in Ceramics International, 36, no. 2 (2010):595-603,
https://doi.org/10.1016/j.ceramint.2009.09.038 . .

TY  - JOUR
AU  - Lazarevic, S.
AU  - Radovanović, Željko
AU  - Veljović, Đorđe N.
AU  - Onjia, Antonije E.
AU  - Janaćković, Đorđe T.
AU  - Petrović, R.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3619
AB  - The adsorption properties of sepiolite from Andrici, Serbia, were studied by inverse gas chromatography at zero and finite surface coverage between 483 and 513 K. The thermodynamic parameters (free energy, enthalpy, entropy) of adsorption, as well as the dispersive and specific components of the free energy of adsorption and the acid/base of the solid were calculated from the IGC data at zero coverage. The K(D)/K(A) ratio indicated basis character. The adsorption isotherms were used to estimate the specific surface area, isosteric heat of adsorption and the adsorption energy distribution for the adsorption of organic molecules. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Applied Clay Science
T1  - Characterization of sepiolite by inverse gas chromatography at infinite and finite surface coverage
VL  - 43
IS  - 1
SP  - 41
EP  - 48
DO  - 10.1016/j.clay.2008.07.013
ER  - 

@article{
author = "Lazarevic, S. and Radovanović, Željko and Veljović, Đorđe N. and Onjia, Antonije E. and Janaćković, Đorđe T. and Petrović, R.",
year = "2009",
abstract = "The adsorption properties of sepiolite from Andrici, Serbia, were studied by inverse gas chromatography at zero and finite surface coverage between 483 and 513 K. The thermodynamic parameters (free energy, enthalpy, entropy) of adsorption, as well as the dispersive and specific components of the free energy of adsorption and the acid/base of the solid were calculated from the IGC data at zero coverage. The K(D)/K(A) ratio indicated basis character. The adsorption isotherms were used to estimate the specific surface area, isosteric heat of adsorption and the adsorption energy distribution for the adsorption of organic molecules. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Applied Clay Science",
title = "Characterization of sepiolite by inverse gas chromatography at infinite and finite surface coverage",
volume = "43",
number = "1",
pages = "41-48",
doi = "10.1016/j.clay.2008.07.013"
}

Lazarevic, S., Radovanović, Ž., Veljović, Đ. N., Onjia, A. E., Janaćković, Đ. T.,& Petrović, R.. (2009). Characterization of sepiolite by inverse gas chromatography at infinite and finite surface coverage. in Applied Clay Science, 43(1), 41-48.
https://doi.org/10.1016/j.clay.2008.07.013

Lazarevic S, Radovanović Ž, Veljović ĐN, Onjia AE, Janaćković ĐT, Petrović R. Characterization of sepiolite by inverse gas chromatography at infinite and finite surface coverage. in Applied Clay Science. 2009;43(1):41-48.
doi:10.1016/j.clay.2008.07.013 .

Lazarevic, S., Radovanović, Željko, Veljović, Đorđe N., Onjia, Antonije E., Janaćković, Đorđe T., Petrović, R., "Characterization of sepiolite by inverse gas chromatography at infinite and finite surface coverage" in Applied Clay Science, 43, no. 1 (2009):41-48,
https://doi.org/10.1016/j.clay.2008.07.013 . .

TY  - JOUR
AU  - Zec, Slavica
AU  - Dukić, Jelena
AU  - Pusevac, M.
AU  - Bošković, Snežana B.
AU  - Petrović, R.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3903
AB  - Synthesis of La-9.33(SiO4)(6)O-2 was performed by a new method that represents the combination of sol-gel and combustion procedures using glycine as the fuel. Syntheses were performed from ethanol-water solutions of oxides precursors, lanthanum nitrate and tetraethyl orthosilicate. The optimum synthesis parameters have been established by varying molar ratio of tetraethyl orthosilicate to water as well as glycine to NO3- ions. The phase identification and the structural characterization were performed by X-ray powder diffraction. The pure nanocrystalline La-9.33(SiO4)(6)O-2 with the crystallite sizes of 32 nm was directly synthesized during combustion process of homogeneous gel that was generated in solution with the following molar ratios: glycine: NO3- = 0.56 and tetraethyl orthosilicate: water = 1:20. Well-crystallized La-9.33(SiO4)(6)O-2 structure was obtained after heating at 1200 degrees C. The lattice parameters a = 9.7156(9) and c = 7.1810(8) angstrom confirmed the composition La-9.33(SiO4)(6)O-2.
T2  - Materials and Manufacturing Processes
T1  - Sol-Gel Combustion Synthesis of La-9.33(SiO4)(6)O-2 Oxyapatite
VL  - 24
IS  - 10-11
SP  - 1104
EP  - 1108
DO  - 10.1080/10426910902976112
ER  - 

@article{
author = "Zec, Slavica and Dukić, Jelena and Pusevac, M. and Bošković, Snežana B. and Petrović, R.",
year = "2009",
abstract = "Synthesis of La-9.33(SiO4)(6)O-2 was performed by a new method that represents the combination of sol-gel and combustion procedures using glycine as the fuel. Syntheses were performed from ethanol-water solutions of oxides precursors, lanthanum nitrate and tetraethyl orthosilicate. The optimum synthesis parameters have been established by varying molar ratio of tetraethyl orthosilicate to water as well as glycine to NO3- ions. The phase identification and the structural characterization were performed by X-ray powder diffraction. The pure nanocrystalline La-9.33(SiO4)(6)O-2 with the crystallite sizes of 32 nm was directly synthesized during combustion process of homogeneous gel that was generated in solution with the following molar ratios: glycine: NO3- = 0.56 and tetraethyl orthosilicate: water = 1:20. Well-crystallized La-9.33(SiO4)(6)O-2 structure was obtained after heating at 1200 degrees C. The lattice parameters a = 9.7156(9) and c = 7.1810(8) angstrom confirmed the composition La-9.33(SiO4)(6)O-2.",
journal = "Materials and Manufacturing Processes",
title = "Sol-Gel Combustion Synthesis of La-9.33(SiO4)(6)O-2 Oxyapatite",
volume = "24",
number = "10-11",
pages = "1104-1108",
doi = "10.1080/10426910902976112"
}

Zec, S., Dukić, J., Pusevac, M., Bošković, S. B.,& Petrović, R.. (2009). Sol-Gel Combustion Synthesis of La-9.33(SiO4)(6)O-2 Oxyapatite. in Materials and Manufacturing Processes, 24(10-11), 1104-1108.
https://doi.org/10.1080/10426910902976112

Zec S, Dukić J, Pusevac M, Bošković SB, Petrović R. Sol-Gel Combustion Synthesis of La-9.33(SiO4)(6)O-2 Oxyapatite. in Materials and Manufacturing Processes. 2009;24(10-11):1104-1108.
doi:10.1080/10426910902976112 .

Zec, Slavica, Dukić, Jelena, Pusevac, M., Bošković, Snežana B., Petrović, R., "Sol-Gel Combustion Synthesis of La-9.33(SiO4)(6)O-2 Oxyapatite" in Materials and Manufacturing Processes, 24, no. 10-11 (2009):1104-1108,
https://doi.org/10.1080/10426910902976112 . .

TY  - CONF
AU  - Tanaskovic, D.
AU  - Veljović, Đorđe N.
AU  - Petrovic, R.
AU  - Janaćković, Đorđe T.
AU  - Mitrić, Miodrag
AU  - Cojanu, C.
AU  - Ristoscu, Carmen
AU  - Mihailescu, Ion N.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6718
AB  - Pulsed laser deposition was used to obtain functionally graded bioactive glass coatings on titanium substrates. An UV KrF* (lambda=248 nm, tau GT 7 ns) excimer laser was used for the multi-pulse irradiation of the targets. The depositions were performed in oxygen while keeping substrate temperature at 400 degrees C. We used sintered glass targets in the system SiO2-Na2O-K2O-CaO-MgO-P2O5 that differed in SiO2 content, which was either 57 wt.% (6P57) or 61 wt.% (6P61). A glass 6P61 was used as the first layer in direct contact with the metallic substrate, while the outer bioactive layer was made of glass 6P57. Both the bioactive coatings and the bulk glasses were analyzed by Fourier transform infrared spectrometry (FTIR), grazing incidence X-ray diffraction (GIXRD), and scanning electron microscopy (SEM). The FTIR spectra of the glass powders and glass coatings showed the main vibration modes of the Si-O-Si groups. GIXRD analysis confirmed that the glass coatings had an amorphous structure. The SEM micrographs of the glass coatings showed the films to consist of droplets with diameters ranging from 0.2 to 5 Pm. SEM was used to determine the rate of apatite formation on the coating when exposed to simulated body fluid (SBF) solution for 7 days. We demonstrated that pulsed laser deposition leads to good glass-metal adhesion on the substrate and well attached bioactive particles on the surface. We consider therefore this method appropriate for forming implants that can develop an apatite layer after immersion in SBF.
C3  - Key Engineering Materials
T1  - Double-layer bioactive glass coatings obtained by pulsed laser deposition
VL  - 361-363
SP  - 277
EP  - +
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6718
ER  - 

@conference{
author = "Tanaskovic, D. and Veljović, Đorđe N. and Petrovic, R. and Janaćković, Đorđe T. and Mitrić, Miodrag and Cojanu, C. and Ristoscu, Carmen and Mihailescu, Ion N.",
year = "2008",
abstract = "Pulsed laser deposition was used to obtain functionally graded bioactive glass coatings on titanium substrates. An UV KrF* (lambda=248 nm, tau GT 7 ns) excimer laser was used for the multi-pulse irradiation of the targets. The depositions were performed in oxygen while keeping substrate temperature at 400 degrees C. We used sintered glass targets in the system SiO2-Na2O-K2O-CaO-MgO-P2O5 that differed in SiO2 content, which was either 57 wt.% (6P57) or 61 wt.% (6P61). A glass 6P61 was used as the first layer in direct contact with the metallic substrate, while the outer bioactive layer was made of glass 6P57. Both the bioactive coatings and the bulk glasses were analyzed by Fourier transform infrared spectrometry (FTIR), grazing incidence X-ray diffraction (GIXRD), and scanning electron microscopy (SEM). The FTIR spectra of the glass powders and glass coatings showed the main vibration modes of the Si-O-Si groups. GIXRD analysis confirmed that the glass coatings had an amorphous structure. The SEM micrographs of the glass coatings showed the films to consist of droplets with diameters ranging from 0.2 to 5 Pm. SEM was used to determine the rate of apatite formation on the coating when exposed to simulated body fluid (SBF) solution for 7 days. We demonstrated that pulsed laser deposition leads to good glass-metal adhesion on the substrate and well attached bioactive particles on the surface. We consider therefore this method appropriate for forming implants that can develop an apatite layer after immersion in SBF.",
journal = "Key Engineering Materials",
title = "Double-layer bioactive glass coatings obtained by pulsed laser deposition",
volume = "361-363",
pages = "277-+",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6718"
}

Tanaskovic, D., Veljović, Đ. N., Petrovic, R., Janaćković, Đ. T., Mitrić, M., Cojanu, C., Ristoscu, C.,& Mihailescu, I. N.. (2008). Double-layer bioactive glass coatings obtained by pulsed laser deposition. in Key Engineering Materials, 361-363, 277-+.
https://hdl.handle.net/21.15107/rcub_vinar_6718

Tanaskovic D, Veljović ĐN, Petrovic R, Janaćković ĐT, Mitrić M, Cojanu C, Ristoscu C, Mihailescu IN. Double-layer bioactive glass coatings obtained by pulsed laser deposition. in Key Engineering Materials. 2008;361-363:277-+.
https://hdl.handle.net/21.15107/rcub_vinar_6718 .

Tanaskovic, D., Veljović, Đorđe N., Petrovic, R., Janaćković, Đorđe T., Mitrić, Miodrag, Cojanu, C., Ristoscu, Carmen, Mihailescu, Ion N., "Double-layer bioactive glass coatings obtained by pulsed laser deposition" in Key Engineering Materials, 361-363 (2008):277-+,
https://hdl.handle.net/21.15107/rcub_vinar_6718 .

TY  - JOUR
AU  - Rakočević, Zlatko Lj.
AU  - Petrović, R.
AU  - Štrbac, Svetlana
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3577
AB  - Silver was sputter deposited on a glass with a thin film thickness ranging from 10 to 80 nm. Scanning tunnelling microscopy was used to study the morphology of the obtained Ag-glass surfaces and to estimate the surface roughness. An equation for the surface roughness of the thin film was evaluated using parameters related to the thin film features: the surface roughness of the substrate, the compressibility of the thin film and the film thickness. The experimental results were fitted using the evaluated equation, and the conditions favouring lower or higher surface roughness were analyzed.
T2  - Journal of Microscopy, Oxford
T1  - Surface roughness of ultra-thin silver films sputter depositedon a glass
VL  - 232
IS  - 3
SP  - 595
EP  - 600
DO  - 10.1111/j.1365-2818.2008.02123.x
ER  - 

@article{
author = "Rakočević, Zlatko Lj. and Petrović, R. and Štrbac, Svetlana",
year = "2008",
abstract = "Silver was sputter deposited on a glass with a thin film thickness ranging from 10 to 80 nm. Scanning tunnelling microscopy was used to study the morphology of the obtained Ag-glass surfaces and to estimate the surface roughness. An equation for the surface roughness of the thin film was evaluated using parameters related to the thin film features: the surface roughness of the substrate, the compressibility of the thin film and the film thickness. The experimental results were fitted using the evaluated equation, and the conditions favouring lower or higher surface roughness were analyzed.",
journal = "Journal of Microscopy, Oxford",
title = "Surface roughness of ultra-thin silver films sputter depositedon a glass",
volume = "232",
number = "3",
pages = "595-600",
doi = "10.1111/j.1365-2818.2008.02123.x"
}

Rakočević, Z. Lj., Petrović, R.,& Štrbac, S.. (2008). Surface roughness of ultra-thin silver films sputter depositedon a glass. in Journal of Microscopy, Oxford, 232(3), 595-600.
https://doi.org/10.1111/j.1365-2818.2008.02123.x

Rakočević ZL, Petrović R, Štrbac S. Surface roughness of ultra-thin silver films sputter depositedon a glass. in Journal of Microscopy, Oxford. 2008;232(3):595-600.
doi:10.1111/j.1365-2818.2008.02123.x .

Rakočević, Zlatko Lj., Petrović, R., Štrbac, Svetlana, "Surface roughness of ultra-thin silver films sputter depositedon a glass" in Journal of Microscopy, Oxford, 232, no. 3 (2008):595-600,
https://doi.org/10.1111/j.1365-2818.2008.02123.x . .

TY  - CONF
AU  - Veljović, Đorđe N.
AU  - Jokić, Bojan M.
AU  - Janković-Častvan, Ivona
AU  - Smičiklas, Ivana D.
AU  - Petrovic, R.
AU  - Janaćković, Đorđe T.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6645
AB  - The influences of temperature and time on sintering behaviour of nanosized HAP powder were investigate in this paper. The calcium hydroxyapatite powder, with the average crystallite size of 34 +/- 1 nm, was uniaxially pressed at a pressure of 500 MPa. Obtained green compacts were sintered at temperature ranging from 1000 degrees C to 1200 degrees C in air atmosphere at various times. According to the results of scanning electron microscopy, X-ray and FTIR analyses, it is shown that HAP compacts with dense microstructure and average grain size below 250 nm is obtained.
C3  - Key Engineering Materials
T1  - Sintering behaviour of nanosized HAP powder
VL  - 330-332
SP  - 259
EP  - +
DO  - 10.4028/www.scientific.net/KEM.330-332.259
ER  - 

@conference{
author = "Veljović, Đorđe N. and Jokić, Bojan M. and Janković-Častvan, Ivona and Smičiklas, Ivana D. and Petrovic, R. and Janaćković, Đorđe T.",
year = "2007",
abstract = "The influences of temperature and time on sintering behaviour of nanosized HAP powder were investigate in this paper. The calcium hydroxyapatite powder, with the average crystallite size of 34 +/- 1 nm, was uniaxially pressed at a pressure of 500 MPa. Obtained green compacts were sintered at temperature ranging from 1000 degrees C to 1200 degrees C in air atmosphere at various times. According to the results of scanning electron microscopy, X-ray and FTIR analyses, it is shown that HAP compacts with dense microstructure and average grain size below 250 nm is obtained.",
journal = "Key Engineering Materials",
title = "Sintering behaviour of nanosized HAP powder",
volume = "330-332",
pages = "259-+",
doi = "10.4028/www.scientific.net/KEM.330-332.259"
}

Veljović, Đ. N., Jokić, B. M., Janković-Častvan, I., Smičiklas, I. D., Petrovic, R.,& Janaćković, Đ. T.. (2007). Sintering behaviour of nanosized HAP powder. in Key Engineering Materials, 330-332, 259-+.
https://doi.org/10.4028/www.scientific.net/KEM.330-332.259

Veljović ĐN, Jokić BM, Janković-Častvan I, Smičiklas ID, Petrovic R, Janaćković ĐT. Sintering behaviour of nanosized HAP powder. in Key Engineering Materials. 2007;330-332:259-+.
doi:10.4028/www.scientific.net/KEM.330-332.259 .

Veljović, Đorđe N., Jokić, Bojan M., Janković-Častvan, Ivona, Smičiklas, Ivana D., Petrovic, R., Janaćković, Đorđe T., "Sintering behaviour of nanosized HAP powder" in Key Engineering Materials, 330-332 (2007):259-+,
https://doi.org/10.4028/www.scientific.net/KEM.330-332.259 . .

TY  - JOUR
AU  - Jokić, Bojan M.
AU  - Janković-Častvan, Ivona
AU  - Veljović, Đorđe N.
AU  - Bučevac, Dušan
AU  - Obradović-Đuričić, K.
AU  - Petrović, R.
AU  - Janaćković, Đorđe T.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2574
AB  - The aim of this work is the investigation of alpha-tricalcium-phosphate (alpha-TCP) formation from calcium-deficient hydroxyapatite (CDHAP), synthesized by hydrothermal method from CaCl2, EDTA, NaH2PO4 center dot 2H(2)O and urea as precursors at 160 degrees C. Further, the influence of Ca/P ratios in the starting solution on alpha-TCP formation and the settings of obtained cements in simulated body fluid (SBF) were investigated. According to the results of X-ray, FTIR and SEM analyses, it is shown that CDHAP is transformed to beta-TCP at 800 degrees C, and to alpha-TCP at 1200 degrees C. Almost complete transformation of CDHAP into alpha-TCP occur after heating at 1500 degrees C in the case when Ca/P ratio in starting solution was 1,42. Cement powder mixed with the cement liquid (2.5 wt.% solution of Na2HPO4) completely hydrolyzes after 7 days in SBF, forming only CDHAP phase.
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method
VL  - 9
IS  - 6
SP  - 1904
EP  - 1910
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2574
ER  - 

@article{
author = "Jokić, Bojan M. and Janković-Častvan, Ivona and Veljović, Đorđe N. and Bučevac, Dušan and Obradović-Đuričić, K. and Petrović, R. and Janaćković, Đorđe T.",
year = "2007",
abstract = "The aim of this work is the investigation of alpha-tricalcium-phosphate (alpha-TCP) formation from calcium-deficient hydroxyapatite (CDHAP), synthesized by hydrothermal method from CaCl2, EDTA, NaH2PO4 center dot 2H(2)O and urea as precursors at 160 degrees C. Further, the influence of Ca/P ratios in the starting solution on alpha-TCP formation and the settings of obtained cements in simulated body fluid (SBF) were investigated. According to the results of X-ray, FTIR and SEM analyses, it is shown that CDHAP is transformed to beta-TCP at 800 degrees C, and to alpha-TCP at 1200 degrees C. Almost complete transformation of CDHAP into alpha-TCP occur after heating at 1500 degrees C in the case when Ca/P ratio in starting solution was 1,42. Cement powder mixed with the cement liquid (2.5 wt.% solution of Na2HPO4) completely hydrolyzes after 7 days in SBF, forming only CDHAP phase.",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method",
volume = "9",
number = "6",
pages = "1904-1910",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2574"
}

Jokić, B. M., Janković-Častvan, I., Veljović, Đ. N., Bučevac, D., Obradović-Đuričić, K., Petrović, R.,& Janaćković, Đ. T.. (2007). Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method. in Journal of Optoelectronics and Advanced Materials, 9(6), 1904-1910.
https://hdl.handle.net/21.15107/rcub_vinar_2574

Jokić BM, Janković-Častvan I, Veljović ĐN, Bučevac D, Obradović-Đuričić K, Petrović R, Janaćković ĐT. Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method. in Journal of Optoelectronics and Advanced Materials. 2007;9(6):1904-1910.
https://hdl.handle.net/21.15107/rcub_vinar_2574 .

Jokić, Bojan M., Janković-Častvan, Ivona, Veljović, Đorđe N., Bučevac, Dušan, Obradović-Đuričić, K., Petrović, R., Janaćković, Đorđe T., "Synthesis and settings behavior of alpha-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method" in Journal of Optoelectronics and Advanced Materials, 9, no. 6 (2007):1904-1910,
https://hdl.handle.net/21.15107/rcub_vinar_2574 .