TY  - JOUR
AU  - Marković, Smilja
AU  - Stojković-Simatović, Ivana
AU  - Ahmetović, Sanita
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Škapin, Srečo Davor
AU  - Bajuk-Bogdanović, Danica
AU  - Janković-Častvan, Ivona
AU  - Uskoković, Dragan
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4235
AB  - ZnO nanopowders were produced using microwave processing of a precipitate and applied as a photoanode for photoelectrochemical water splitting. Two different surfactants, cetyltrimethylammonium bromide (CTAB) as the cationic and Pluronic F127 as the non-ionic one, were employed to in situ adjust the surface-to-bulk defect ratio in the ZnO crystal structure and further to modify the photo(electro)catalytic activity of the ZnO photoanode. The crystal structure, morphological, textural, optical and photo(electro)catalytic properties of ZnO particles were studied in detail to explain the profound effects of the surfactants on the photoanode activity. The ZnO/CTAB photoanode displayed the highest photocurrent density of 27 mA g(-1), compared to ZnO (10.4 mA g(-1)) and ZnO/F127 photoanodes (20 mA g(-1)) at 1.5 V vs. SCE in 0.1 M Na2SO4 under visible illumination of 90 mW cm(-2). A significant shift of the overpotential toward lower values was also observed when photoanodes were illuminated. The highest shift of the overpotential, from 1.296 to 0.248 V vs. SCE, was recorded when the ZnO/CTAB photanode was illuminated. The ZnO/CTAB photoanode provides efficient charge transfer across the electrode/electrolyte interface, with a longer lifetime of photogenerated electron-hole pairs and reduced possibility of charge recombination. The photoconversion efficiency was improved from 1.4% for ZnO and 0.9% for ZnO/F127 to 4.2% for ZnO/CTAB at 0.510 mV. A simple procedure for the synthesis of ZnO particles with improved photo(electro)catalytic properties was established and it was found that even a small amount of CTAB used during processing of ZnO increases the surface-to-bulk defect ratio. Optimization of the surface-to-bulk defect ratio in ZnO materials enables increase of the absorption capacity for visible light, rendering of the recombination rate of the photogenerated pair, as well as increase of both the photocurrent density and photoconversion efficiency.
PB  - Royal Soc Chemistry, Cambridge
T2  - RSC Advances
T1  - Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties
EP  - 17178
IS  - 30
SP  - 17165
VL  - 9
DO  - 10.1039/c9ra02553g
ER  - 

@article{
author = "Marković, Smilja and Stojković-Simatović, Ivana and Ahmetović, Sanita and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Škapin, Srečo Davor and Bajuk-Bogdanović, Danica and Janković-Častvan, Ivona and Uskoković, Dragan",
year = "2019",
abstract = "ZnO nanopowders were produced using microwave processing of a precipitate and applied as a photoanode for photoelectrochemical water splitting. Two different surfactants, cetyltrimethylammonium bromide (CTAB) as the cationic and Pluronic F127 as the non-ionic one, were employed to in situ adjust the surface-to-bulk defect ratio in the ZnO crystal structure and further to modify the photo(electro)catalytic activity of the ZnO photoanode. The crystal structure, morphological, textural, optical and photo(electro)catalytic properties of ZnO particles were studied in detail to explain the profound effects of the surfactants on the photoanode activity. The ZnO/CTAB photoanode displayed the highest photocurrent density of 27 mA g(-1), compared to ZnO (10.4 mA g(-1)) and ZnO/F127 photoanodes (20 mA g(-1)) at 1.5 V vs. SCE in 0.1 M Na2SO4 under visible illumination of 90 mW cm(-2). A significant shift of the overpotential toward lower values was also observed when photoanodes were illuminated. The highest shift of the overpotential, from 1.296 to 0.248 V vs. SCE, was recorded when the ZnO/CTAB photanode was illuminated. The ZnO/CTAB photoanode provides efficient charge transfer across the electrode/electrolyte interface, with a longer lifetime of photogenerated electron-hole pairs and reduced possibility of charge recombination. The photoconversion efficiency was improved from 1.4% for ZnO and 0.9% for ZnO/F127 to 4.2% for ZnO/CTAB at 0.510 mV. A simple procedure for the synthesis of ZnO particles with improved photo(electro)catalytic properties was established and it was found that even a small amount of CTAB used during processing of ZnO increases the surface-to-bulk defect ratio. Optimization of the surface-to-bulk defect ratio in ZnO materials enables increase of the absorption capacity for visible light, rendering of the recombination rate of the photogenerated pair, as well as increase of both the photocurrent density and photoconversion efficiency.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "RSC Advances",
title = "Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties",
pages = "17178-17165",
number = "30",
volume = "9",
doi = "10.1039/c9ra02553g"
}

Marković, S., Stojković-Simatović, I., Ahmetović, S., Veselinović, L., Stojadinović, S., Rac, V., Škapin, S. D., Bajuk-Bogdanović, D., Janković-Častvan, I.,& Uskoković, D.. (2019). Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties. in RSC Advances
Royal Soc Chemistry, Cambridge., 9(30), 17165-17178.
https://doi.org/10.1039/c9ra02553g

Marković S, Stojković-Simatović I, Ahmetović S, Veselinović L, Stojadinović S, Rac V, Škapin SD, Bajuk-Bogdanović D, Janković-Častvan I, Uskoković D. Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties. in RSC Advances. 2019;9(30):17165-17178.
doi:10.1039/c9ra02553g .

Marković, Smilja, Stojković-Simatović, Ivana, Ahmetović, Sanita, Veselinović, Ljiljana, Stojadinović, Stevan, Rac, Vladislav, Škapin, Srečo Davor, Bajuk-Bogdanović, Danica, Janković-Častvan, Ivona, Uskoković, Dragan, "Surfactant-assisted microwave processing of ZnO particles: a simple way for designing the surface-to-bulk defect ratio and improving photo(electro)catalytic properties" in RSC Advances, 9, no. 30 (2019):17165-17178,
https://doi.org/10.1039/c9ra02553g . .

TY  - JOUR
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Milović, Miloš
AU  - Cvjetićanin, Nikola
AU  - Jokić, Bojan
AU  - Umićević, Ana
AU  - Uskoković, Dragan
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5856
AB  - Low intrinsic electronic conductivity is the main disadvantage of LiFePO4 when used as a cathode material in lithium ion batteries. The paper offers experimental proofs of the theoretical prediction that fluorine doping of LiFePO4 can enhance its electrical conductivity. The LiFePO4 and fluorine-doped LiFePO4 olivine type, carbon-free powders are synthesized and examined. The crystal structure refinements in the Pnma space group reveal that doping with fluorine ions preserves the olivine structure, while reducing both the lattice parameters and the antisite defect, and increasing the crystallite size. A small amount of incorporated fluorine enhances the electrical conductivity from 4.6×10−7 S cm−1 to 2.3×10−6 S cm−1 and has a positive impact on the electrochemical performance. Several spectroscopy techniques (Mössbauer, FTIR, and Raman) reveal differences between the two powders and additionally support the findings of both the Rietveld refinement and the conductivity measurements.
PB  - Elsevier
T2  - Ceramics International
T1  - The influence of fluorine doping on the structural and electrical properties of the LiFePO4 powder
EP  - 3230
IS  - 3
SP  - 3224
VL  - 43
DO  - 10.1016/j.ceramint.2016.11.149
UR  - https://hdl.handle.net/21.15107/rcub_dais_2352
ER  - 

@article{
author = "Jugović, Dragana and Mitrić, Miodrag and Milović, Miloš and Cvjetićanin, Nikola and Jokić, Bojan and Umićević, Ana and Uskoković, Dragan",
year = "2017",
abstract = "Low intrinsic electronic conductivity is the main disadvantage of LiFePO4 when used as a cathode material in lithium ion batteries. The paper offers experimental proofs of the theoretical prediction that fluorine doping of LiFePO4 can enhance its electrical conductivity. The LiFePO4 and fluorine-doped LiFePO4 olivine type, carbon-free powders are synthesized and examined. The crystal structure refinements in the Pnma space group reveal that doping with fluorine ions preserves the olivine structure, while reducing both the lattice parameters and the antisite defect, and increasing the crystallite size. A small amount of incorporated fluorine enhances the electrical conductivity from 4.6×10−7 S cm−1 to 2.3×10−6 S cm−1 and has a positive impact on the electrochemical performance. Several spectroscopy techniques (Mössbauer, FTIR, and Raman) reveal differences between the two powders and additionally support the findings of both the Rietveld refinement and the conductivity measurements.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "The influence of fluorine doping on the structural and electrical properties of the LiFePO4 powder",
pages = "3230-3224",
number = "3",
volume = "43",
doi = "10.1016/j.ceramint.2016.11.149",
url = "https://hdl.handle.net/21.15107/rcub_dais_2352"
}

Jugović, D., Mitrić, M., Milović, M., Cvjetićanin, N., Jokić, B., Umićević, A.,& Uskoković, D.. (2017). The influence of fluorine doping on the structural and electrical properties of the LiFePO4 powder. in Ceramics International
Elsevier., 43(3), 3224-3230.
https://doi.org/10.1016/j.ceramint.2016.11.149
https://hdl.handle.net/21.15107/rcub_dais_2352

Jugović D, Mitrić M, Milović M, Cvjetićanin N, Jokić B, Umićević A, Uskoković D. The influence of fluorine doping on the structural and electrical properties of the LiFePO4 powder. in Ceramics International. 2017;43(3):3224-3230.
doi:10.1016/j.ceramint.2016.11.149
https://hdl.handle.net/21.15107/rcub_dais_2352 .

Jugović, Dragana, Mitrić, Miodrag, Milović, Miloš, Cvjetićanin, Nikola, Jokić, Bojan, Umićević, Ana, Uskoković, Dragan, "The influence of fluorine doping on the structural and electrical properties of the LiFePO4 powder" in Ceramics International, 43, no. 3 (2017):3224-3230,
https://doi.org/10.1016/j.ceramint.2016.11.149 .,
https://hdl.handle.net/21.15107/rcub_dais_2352 .

TY  - JOUR
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Dostanić, Jasmina
AU  - Veselinović, Ljiljana
AU  - Mančić, Lidija
AU  - Škapin, Srečo Davor
AU  - Dražić, Goran
AU  - Janković-Častvan, Ivona
AU  - Uskoković, Dragan
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3541
AB  - Mechanical milling of commercial ZnO and SnO2 was used to produce a ZnO/SnO2 composite with a high density of surface defects; in particular, zinc interstitials (Zni) and oxygen vacancies (VO). To determine the impact of surface defects on photocatalytic activity, the relative concentration ratio of bulk defects to surface defects was modified by annealing at 400 and 700 degrees C. The possible application of the ZnO/SnO2 composite as a natural sunlight and UV- light driven photocatalyst was revealed via de-colorization of methylene blue. In both cases the ZnO/SnO2 composite exhibited enhanced photocatalytic activity as compared to the pristine ZnO. In order to investigate the origin of the enhancement, the pristine metal oxides and composites were characterized using a variety of techniques, including X-ray diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), laser diffraction particle size analysis, Brunauer-Emmett-Teller, UV-Vis diffuse reflectance and photoluminescence spectroscopy. High-resolution transmission electron microscopy (HRTEM) and elemental mapping analyses were used to reveal the presence of SnO2 nanocrystallites on the surface of larger ZnO particles. The enhanced photocatalytic activity of the composite can be attributed to the synergetic effect of the surface defects and the ZnO/SnO2 heterojunction particles, which facilitated charge separation, thereby hindering the recombination of photogenerated carriers. This study draws attention to mechanical activation as an inexpensive and environmentally friendly technique for the large-scale production of the composite with an enhanced photocatalytic activity under illumination of either UV or sunlight.
PB  - Royal Soc Chemistry, Cambridge
T2  - RSC Advances
T1  - Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite
EP  - 42737
IS  - 68
SP  - 42725
VL  - 7
DO  - 10.1039/c7ra06895f
ER  - 

@article{
author = "Marković, Smilja and Stanković, Ana and Dostanić, Jasmina and Veselinović, Ljiljana and Mančić, Lidija and Škapin, Srečo Davor and Dražić, Goran and Janković-Častvan, Ivona and Uskoković, Dragan",
year = "2017",
abstract = "Mechanical milling of commercial ZnO and SnO2 was used to produce a ZnO/SnO2 composite with a high density of surface defects; in particular, zinc interstitials (Zni) and oxygen vacancies (VO). To determine the impact of surface defects on photocatalytic activity, the relative concentration ratio of bulk defects to surface defects was modified by annealing at 400 and 700 degrees C. The possible application of the ZnO/SnO2 composite as a natural sunlight and UV- light driven photocatalyst was revealed via de-colorization of methylene blue. In both cases the ZnO/SnO2 composite exhibited enhanced photocatalytic activity as compared to the pristine ZnO. In order to investigate the origin of the enhancement, the pristine metal oxides and composites were characterized using a variety of techniques, including X-ray diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), laser diffraction particle size analysis, Brunauer-Emmett-Teller, UV-Vis diffuse reflectance and photoluminescence spectroscopy. High-resolution transmission electron microscopy (HRTEM) and elemental mapping analyses were used to reveal the presence of SnO2 nanocrystallites on the surface of larger ZnO particles. The enhanced photocatalytic activity of the composite can be attributed to the synergetic effect of the surface defects and the ZnO/SnO2 heterojunction particles, which facilitated charge separation, thereby hindering the recombination of photogenerated carriers. This study draws attention to mechanical activation as an inexpensive and environmentally friendly technique for the large-scale production of the composite with an enhanced photocatalytic activity under illumination of either UV or sunlight.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "RSC Advances",
title = "Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite",
pages = "42737-42725",
number = "68",
volume = "7",
doi = "10.1039/c7ra06895f"
}

Marković, S., Stanković, A., Dostanić, J., Veselinović, L., Mančić, L., Škapin, S. D., Dražić, G., Janković-Častvan, I.,& Uskoković, D.. (2017). Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite. in RSC Advances
Royal Soc Chemistry, Cambridge., 7(68), 42725-42737.
https://doi.org/10.1039/c7ra06895f

Marković S, Stanković A, Dostanić J, Veselinović L, Mančić L, Škapin SD, Dražić G, Janković-Častvan I, Uskoković D. Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite. in RSC Advances. 2017;7(68):42725-42737.
doi:10.1039/c7ra06895f .

Marković, Smilja, Stanković, Ana, Dostanić, Jasmina, Veselinović, Ljiljana, Mančić, Lidija, Škapin, Srečo Davor, Dražić, Goran, Janković-Častvan, Ivona, Uskoković, Dragan, "Simultaneous enhancement of natural sunlightand artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite" in RSC Advances, 7, no. 68 (2017):42725-42737,
https://doi.org/10.1039/c7ra06895f . .

TY  - JOUR
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Lopičić, Zorica
AU  - Lazarević, Slavica
AU  - Stojanović, Mirjana
AU  - Uskoković, Dragan
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2918
AB  - A possibility to apply raw, powdered peach shells ( PS) as a biosorbent for water purification was studied. The PSs are locally available as a solid waste in a fruit juice factory; methylene blue (MB) was chosen as representative of common pollutants in textile industry wastewater. The phase composition of prepared particles was identified by XRD. The particle morphology was characterized by FE-SEM, while the size distribution was measured by a laser light-scattering particle size analyzer. The BET specific surface area was determined from N-2 adsorption/desorption experiments. The effect of operating parameters: the biosorbent amount (50-1000 mg/100 mL), contact time (10-180 min), solution pH (2-12) and initial concentration (10-100 ppm) on biosorption efficiency was examined. Optimal conditions for MB removal were found to be: the biosorbent amount of 400 mg/100 mL and pH 5.5. A high efficiency of MB removal was established after 180 min: 99% for [MB](i) = 10 ppm and 76% for [MB](i) = 100 ppm. Biosorption is well described by the Freundlich- and BET-type isotherms, implicating heterogeneous adsorption sites and interconnections between adsorbed molecules. The FTIR spectroscopy results indicate hydrogen bonding between the dye and the biomass. The obtained results shown that raw peach shell particles could be used as an efficient low-cost biosorbent for dye removal from water.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of Environmental Chemical Engineering
T1  - Application of raw peach shell particles for removal of methylene blue
EP  - 724
IS  - 2
SP  - 716
VL  - 3
DO  - 10.1016/j.jece.2015.04.002
ER  - 

@article{
author = "Marković, Smilja and Stanković, Ana and Lopičić, Zorica and Lazarević, Slavica and Stojanović, Mirjana and Uskoković, Dragan",
year = "2015",
abstract = "A possibility to apply raw, powdered peach shells ( PS) as a biosorbent for water purification was studied. The PSs are locally available as a solid waste in a fruit juice factory; methylene blue (MB) was chosen as representative of common pollutants in textile industry wastewater. The phase composition of prepared particles was identified by XRD. The particle morphology was characterized by FE-SEM, while the size distribution was measured by a laser light-scattering particle size analyzer. The BET specific surface area was determined from N-2 adsorption/desorption experiments. The effect of operating parameters: the biosorbent amount (50-1000 mg/100 mL), contact time (10-180 min), solution pH (2-12) and initial concentration (10-100 ppm) on biosorption efficiency was examined. Optimal conditions for MB removal were found to be: the biosorbent amount of 400 mg/100 mL and pH 5.5. A high efficiency of MB removal was established after 180 min: 99% for [MB](i) = 10 ppm and 76% for [MB](i) = 100 ppm. Biosorption is well described by the Freundlich- and BET-type isotherms, implicating heterogeneous adsorption sites and interconnections between adsorbed molecules. The FTIR spectroscopy results indicate hydrogen bonding between the dye and the biomass. The obtained results shown that raw peach shell particles could be used as an efficient low-cost biosorbent for dye removal from water.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of Environmental Chemical Engineering",
title = "Application of raw peach shell particles for removal of methylene blue",
pages = "724-716",
number = "2",
volume = "3",
doi = "10.1016/j.jece.2015.04.002"
}

Marković, S., Stanković, A., Lopičić, Z., Lazarević, S., Stojanović, M.,& Uskoković, D.. (2015). Application of raw peach shell particles for removal of methylene blue. in Journal of Environmental Chemical Engineering
Elsevier Sci Ltd, Oxford., 3(2), 716-724.
https://doi.org/10.1016/j.jece.2015.04.002

Marković S, Stanković A, Lopičić Z, Lazarević S, Stojanović M, Uskoković D. Application of raw peach shell particles for removal of methylene blue. in Journal of Environmental Chemical Engineering. 2015;3(2):716-724.
doi:10.1016/j.jece.2015.04.002 .

Marković, Smilja, Stanković, Ana, Lopičić, Zorica, Lazarević, Slavica, Stojanović, Mirjana, Uskoković, Dragan, "Application of raw peach shell particles for removal of methylene blue" in Journal of Environmental Chemical Engineering, 3, no. 2 (2015):716-724,
https://doi.org/10.1016/j.jece.2015.04.002 . .

TY  - JOUR
AU  - Kuzmanović, Maja
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Jokić, Bojan
AU  - Cvjetićanin, Nikola
AU  - Uskoković, Dragan
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5807
AB  - Olivine-type LiFePO4 composite powders with carbon were synthesized by freeze drying and subsequent thermal annealing. The main purpose of the research is to explore how various dicarboxylic acids as carbon sources influence the electrochemical properties of the resulting composites. Three dicarboxylic acids (oxalic, malonic, and adipic) were used as a carbon source. The synthesis was followed by X-ray powder diffraction, scanning electron microscopy, particle-size analysis, and electrochemical experiments. It is shown that the amount of the in situ formed carbon depends on the thermal behaviour of the acids in inert atmosphere rather than on their carbon content. Cyclic voltammetry experiments and galvanostatic cycling illustrate the behaviour of different powders: the powder obtained with oxalic acid yields the highest discharge capacity at small currents, while the one obtained with adipic acid shows better high-current response. Malonic acid has turned out to be a poor carbon source and it consequently yields powder with poor electrochemical performance. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
PB  - Elsevier Ltd.
T2  - Ceramics International
T1  - The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite
EP  - 6758
IS  - 5
SP  - 6753
VL  - 41
DO  - 10.1016/j.ceramint.2015.01.121
UR  - https://hdl.handle.net/21.15107/rcub_dais_2590
ER  - 

@article{
author = "Kuzmanović, Maja and Jugović, Dragana and Mitrić, Miodrag and Jokić, Bojan and Cvjetićanin, Nikola and Uskoković, Dragan",
year = "2015",
abstract = "Olivine-type LiFePO4 composite powders with carbon were synthesized by freeze drying and subsequent thermal annealing. The main purpose of the research is to explore how various dicarboxylic acids as carbon sources influence the electrochemical properties of the resulting composites. Three dicarboxylic acids (oxalic, malonic, and adipic) were used as a carbon source. The synthesis was followed by X-ray powder diffraction, scanning electron microscopy, particle-size analysis, and electrochemical experiments. It is shown that the amount of the in situ formed carbon depends on the thermal behaviour of the acids in inert atmosphere rather than on their carbon content. Cyclic voltammetry experiments and galvanostatic cycling illustrate the behaviour of different powders: the powder obtained with oxalic acid yields the highest discharge capacity at small currents, while the one obtained with adipic acid shows better high-current response. Malonic acid has turned out to be a poor carbon source and it consequently yields powder with poor electrochemical performance. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
publisher = "Elsevier Ltd.",
journal = "Ceramics International",
title = "The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite",
pages = "6758-6753",
number = "5",
volume = "41",
doi = "10.1016/j.ceramint.2015.01.121",
url = "https://hdl.handle.net/21.15107/rcub_dais_2590"
}

Kuzmanović, M., Jugović, D., Mitrić, M., Jokić, B., Cvjetićanin, N.,& Uskoković, D.. (2015). The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite. in Ceramics International
Elsevier Ltd.., 41(5), 6753-6758.
https://doi.org/10.1016/j.ceramint.2015.01.121
https://hdl.handle.net/21.15107/rcub_dais_2590

Kuzmanović M, Jugović D, Mitrić M, Jokić B, Cvjetićanin N, Uskoković D. The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite. in Ceramics International. 2015;41(5):6753-6758.
doi:10.1016/j.ceramint.2015.01.121
https://hdl.handle.net/21.15107/rcub_dais_2590 .

Kuzmanović, Maja, Jugović, Dragana, Mitrić, Miodrag, Jokić, Bojan, Cvjetićanin, Nikola, Uskoković, Dragan, "The use of various dicarboxylic acids as a carbon source for the preparation of LiFePO4/C composite" in Ceramics International, 41, no. 5 (2015):6753-6758,
https://doi.org/10.1016/j.ceramint.2015.01.121 .,
https://hdl.handle.net/21.15107/rcub_dais_2590 .

TY  - JOUR
AU  - Jugović, Dragana
AU  - Milović, Miloš
AU  - Ivanovski, Valentin N.
AU  - Avdeev, Maxim
AU  - Dominko, Robert
AU  - Jokić, Bojan
AU  - Uskoković, Dragan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5786
AB  - A composite powder Li2FeSiO4/C is synthesized through a solid state reaction at 750 °C. The Rietveld crystal structure refinement is done in the monoclinic P21/n space group. It is found that the crystal structure is prone to “antisite” defect where small part of iron ion occupies exclusively Li(2) crystallographic position, of two different lithium tetrahedral positions (Li(1) and Li(2)). This finding is also confirmed by Mössbauer spectroscopy study: the sextet evidenced in the Mössbauer spectrum is assigned to the iron ions positioned at the Li(2) sites. A bond-valence energy landscape calculation is used to predict the conduction pathways of lithium ions. The calculations suggest that Li conductivity is two-dimensional in the (101) plane. Upon galvanostatic cyclings the structure starts to rearrange to inverse βII polymorph.
PB  - Elsevier B.V.
T2  - Journal of Power Sources
T1  - Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy
EP  - 80
SP  - 75
VL  - 265
DO  - 10.1016/j.jpowsour.2014.04.121
UR  - https://hdl.handle.net/21.15107/rcub_dais_755
ER  - 

@article{
author = "Jugović, Dragana and Milović, Miloš and Ivanovski, Valentin N. and Avdeev, Maxim and Dominko, Robert and Jokić, Bojan and Uskoković, Dragan",
year = "2014",
abstract = "A composite powder Li2FeSiO4/C is synthesized through a solid state reaction at 750 °C. The Rietveld crystal structure refinement is done in the monoclinic P21/n space group. It is found that the crystal structure is prone to “antisite” defect where small part of iron ion occupies exclusively Li(2) crystallographic position, of two different lithium tetrahedral positions (Li(1) and Li(2)). This finding is also confirmed by Mössbauer spectroscopy study: the sextet evidenced in the Mössbauer spectrum is assigned to the iron ions positioned at the Li(2) sites. A bond-valence energy landscape calculation is used to predict the conduction pathways of lithium ions. The calculations suggest that Li conductivity is two-dimensional in the (101) plane. Upon galvanostatic cyclings the structure starts to rearrange to inverse βII polymorph.",
publisher = "Elsevier B.V.",
journal = "Journal of Power Sources",
title = "Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy",
pages = "80-75",
volume = "265",
doi = "10.1016/j.jpowsour.2014.04.121",
url = "https://hdl.handle.net/21.15107/rcub_dais_755"
}

Jugović, D., Milović, M., Ivanovski, V. N., Avdeev, M., Dominko, R., Jokić, B.,& Uskoković, D.. (2014). Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy. in Journal of Power Sources
Elsevier B.V.., 265, 75-80.
https://doi.org/10.1016/j.jpowsour.2014.04.121
https://hdl.handle.net/21.15107/rcub_dais_755

Jugović D, Milović M, Ivanovski VN, Avdeev M, Dominko R, Jokić B, Uskoković D. Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy. in Journal of Power Sources. 2014;265:75-80.
doi:10.1016/j.jpowsour.2014.04.121
https://hdl.handle.net/21.15107/rcub_dais_755 .

Jugović, Dragana, Milović, Miloš, Ivanovski, Valentin N., Avdeev, Maxim, Dominko, Robert, Jokić, Bojan, Uskoković, Dragan, "Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy" in Journal of Power Sources, 265 (2014):75-80,
https://doi.org/10.1016/j.jpowsour.2014.04.121 .,
https://hdl.handle.net/21.15107/rcub_dais_755 .

TY  - JOUR
AU  - Jugović, Dragana
AU  - Milović, Miloš
AU  - Ivanovski, Valentin N.
AU  - Avdeev, Maxim
AU  - Dominko, Robert
AU  - Jokić, Bojan
AU  - Uskoković, Dragan
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5787
AB  - A composite powder Li2FeSiO4/C is synthesized through a solid state reaction at 750 °C. The Rietveld crystal structure refinement is done in the monoclinic P21/n space group. It is found that the crystal structure is prone to “antisite” defect where small part of iron ion occupies exclusively Li(2) crystallographic position, of two different lithium tetrahedral positions (Li(1) and Li(2)). This finding is also confirmed by Mössbauer spectroscopy study: the sextet evidenced in the Mössbauer spectrum is assigned to the iron ions positioned at the Li(2) sites. A bond-valence energy landscape calculation is used to predict the conduction pathways of lithium ions. The calculations suggest that Li conductivity is two-dimensional in the (101) plane. Upon galvanostatic cyclings the structure starts to rearrange to inverse βII polymorph.
PB  - Elsevier B.V.
T2  - Journal of Power Sources
T1  - Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy
EP  - 80
SP  - 75
VL  - 265
DO  - 10.1016/j.jpowsour.2014.04.121
UR  - https://hdl.handle.net/21.15107/rcub_dais_542
ER  - 

@article{
author = "Jugović, Dragana and Milović, Miloš and Ivanovski, Valentin N. and Avdeev, Maxim and Dominko, Robert and Jokić, Bojan and Uskoković, Dragan",
year = "2014",
abstract = "A composite powder Li2FeSiO4/C is synthesized through a solid state reaction at 750 °C. The Rietveld crystal structure refinement is done in the monoclinic P21/n space group. It is found that the crystal structure is prone to “antisite” defect where small part of iron ion occupies exclusively Li(2) crystallographic position, of two different lithium tetrahedral positions (Li(1) and Li(2)). This finding is also confirmed by Mössbauer spectroscopy study: the sextet evidenced in the Mössbauer spectrum is assigned to the iron ions positioned at the Li(2) sites. A bond-valence energy landscape calculation is used to predict the conduction pathways of lithium ions. The calculations suggest that Li conductivity is two-dimensional in the (101) plane. Upon galvanostatic cyclings the structure starts to rearrange to inverse βII polymorph.",
publisher = "Elsevier B.V.",
journal = "Journal of Power Sources",
title = "Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy",
pages = "80-75",
volume = "265",
doi = "10.1016/j.jpowsour.2014.04.121",
url = "https://hdl.handle.net/21.15107/rcub_dais_542"
}

Jugović, D., Milović, M., Ivanovski, V. N., Avdeev, M., Dominko, R., Jokić, B.,& Uskoković, D.. (2014). Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy. in Journal of Power Sources
Elsevier B.V.., 265, 75-80.
https://doi.org/10.1016/j.jpowsour.2014.04.121
https://hdl.handle.net/21.15107/rcub_dais_542

Jugović D, Milović M, Ivanovski VN, Avdeev M, Dominko R, Jokić B, Uskoković D. Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy. in Journal of Power Sources. 2014;265:75-80.
doi:10.1016/j.jpowsour.2014.04.121
https://hdl.handle.net/21.15107/rcub_dais_542 .

Jugović, Dragana, Milović, Miloš, Ivanovski, Valentin N., Avdeev, Maxim, Dominko, Robert, Jokić, Bojan, Uskoković, Dragan, "Structural study of monoclinic Li2FeSiO4 by X-ray diffraction and Mössbauer spectroscopy" in Journal of Power Sources, 265 (2014):75-80,
https://doi.org/10.1016/j.jpowsour.2014.04.121 .,
https://hdl.handle.net/21.15107/rcub_dais_542 .

TY  - JOUR
AU  - Nastasović, Aleksandra
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
AU  - Marković, Dana D.
AU  - Ekmeščić, Bojana
AU  - Maksin, Danijela
AU  - Onjia, Antonije
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2822
AB  - Inverse gas chromatography at infinite dilution was applied to determine the thermodynamic interactions of poly(l-lactide) (PLLA) and the composite of biphasic calcium phosphate and PLLA (BCP/PLLA). The specific retention volumes, , of 11 organic compounds of different chemical nature and polarity (non-polar, donor or acceptor) were determined in the temperature range of 308-378 K for PLLA and 308-398 K for BCP/PLLA. The weight fraction activity coefficients of test sorbates, , and the Flory-Huggins interaction parameters, , were estimated and discussed in terms of interactions of the sorbates with PLLA and BCP/PLLA. Also, the partial molar free energy, , the partial molar heat of mixing, , the sorption molar free energy, , the sorption enthalpy, , and the sorption entropy, , were analyzed. A different chromatographic behavior of the two investigated samples, PLLA and BCP/PLLA, was observed. The values of indicated n-alkanes, diethyl ether, tetrahydrofurane (THF), cyclohexane, benzene, dioxane (except for 338 K), and ethyl acetate (EtAc) (except for 338 K) as non-solvents, and chloroform (CHCl3) as good solvent (except for 378 K) for PLLA. For BCP/PLLA, CHCl3, EtAc (for 378 K), dioxane (except for 378 K), and THF were indicated as good solvents.
PB  - Springer, New York
T2  - Journal of Materials Science
T1  - Determination of thermodynamic interactions of polylactide and biphasic calcium phosphate/polylactidecomposite by inverse gas chromatography at infinite dilution
EP  - 5086
IS  - 14
SP  - 5076
VL  - 49
DO  - 10.1007/s10853-014-8214-3
ER  - 

@article{
author = "Nastasović, Aleksandra and Ignjatović, Nenad and Uskoković, Dragan and Marković, Dana D. and Ekmeščić, Bojana and Maksin, Danijela and Onjia, Antonije",
year = "2014",
abstract = "Inverse gas chromatography at infinite dilution was applied to determine the thermodynamic interactions of poly(l-lactide) (PLLA) and the composite of biphasic calcium phosphate and PLLA (BCP/PLLA). The specific retention volumes, , of 11 organic compounds of different chemical nature and polarity (non-polar, donor or acceptor) were determined in the temperature range of 308-378 K for PLLA and 308-398 K for BCP/PLLA. The weight fraction activity coefficients of test sorbates, , and the Flory-Huggins interaction parameters, , were estimated and discussed in terms of interactions of the sorbates with PLLA and BCP/PLLA. Also, the partial molar free energy, , the partial molar heat of mixing, , the sorption molar free energy, , the sorption enthalpy, , and the sorption entropy, , were analyzed. A different chromatographic behavior of the two investigated samples, PLLA and BCP/PLLA, was observed. The values of indicated n-alkanes, diethyl ether, tetrahydrofurane (THF), cyclohexane, benzene, dioxane (except for 338 K), and ethyl acetate (EtAc) (except for 338 K) as non-solvents, and chloroform (CHCl3) as good solvent (except for 378 K) for PLLA. For BCP/PLLA, CHCl3, EtAc (for 378 K), dioxane (except for 378 K), and THF were indicated as good solvents.",
publisher = "Springer, New York",
journal = "Journal of Materials Science",
title = "Determination of thermodynamic interactions of polylactide and biphasic calcium phosphate/polylactidecomposite by inverse gas chromatography at infinite dilution",
pages = "5086-5076",
number = "14",
volume = "49",
doi = "10.1007/s10853-014-8214-3"
}

Nastasović, A., Ignjatović, N., Uskoković, D., Marković, D. D., Ekmeščić, B., Maksin, D.,& Onjia, A.. (2014). Determination of thermodynamic interactions of polylactide and biphasic calcium phosphate/polylactidecomposite by inverse gas chromatography at infinite dilution. in Journal of Materials Science
Springer, New York., 49(14), 5076-5086.
https://doi.org/10.1007/s10853-014-8214-3

Nastasović A, Ignjatović N, Uskoković D, Marković DD, Ekmeščić B, Maksin D, Onjia A. Determination of thermodynamic interactions of polylactide and biphasic calcium phosphate/polylactidecomposite by inverse gas chromatography at infinite dilution. in Journal of Materials Science. 2014;49(14):5076-5086.
doi:10.1007/s10853-014-8214-3 .

Nastasović, Aleksandra, Ignjatović, Nenad, Uskoković, Dragan, Marković, Dana D., Ekmeščić, Bojana, Maksin, Danijela, Onjia, Antonije, "Determination of thermodynamic interactions of polylactide and biphasic calcium phosphate/polylactidecomposite by inverse gas chromatography at infinite dilution" in Journal of Materials Science, 49, no. 14 (2014):5076-5086,
https://doi.org/10.1007/s10853-014-8214-3 . .

TY  - JOUR
AU  - Jugović, Dragana
AU  - Mitrić, Miodrag
AU  - Milović, Miloš
AU  - Jokić, Bojan M.
AU  - Vukomanovic, Marija
AU  - Suvorov, Danilo
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5712
AB  - In this study, nanocrystalline LiFePO4/C composite powder has been synthesized via a cellulose matrix-assisted method. In an experiment conducted under extreme conditions involving rapid heating, short high-temperature delay, and subsequent quenching, well-ordered 35-nm crystallites have been obtained within 5 min. A quantitative filter paper has served both as a template and carbon source. It degrades pyrolytically through fragmentation reactions and formation of volatiles when exposed to rapid heating, which further has an impact on powder morphology, as revealed by electron microscopy studies. The electrochemical measurements in terms of galvanostatic cycling have shown that the approach presented in this study may enable to reach good rate capability and excellent cycling stability. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Powder Technology
T1  - Properties of quenched LiFePO4/C powder obtained via cellulose matrix-assisted method
EP  - 544
SP  - 539
VL  - 246
DO  - 10.1016/j.powtec.2013.06.021
ER  - 

@article{
author = "Jugović, Dragana and Mitrić, Miodrag and Milović, Miloš and Jokić, Bojan M. and Vukomanovic, Marija and Suvorov, Danilo and Uskoković, Dragan",
year = "2013",
abstract = "In this study, nanocrystalline LiFePO4/C composite powder has been synthesized via a cellulose matrix-assisted method. In an experiment conducted under extreme conditions involving rapid heating, short high-temperature delay, and subsequent quenching, well-ordered 35-nm crystallites have been obtained within 5 min. A quantitative filter paper has served both as a template and carbon source. It degrades pyrolytically through fragmentation reactions and formation of volatiles when exposed to rapid heating, which further has an impact on powder morphology, as revealed by electron microscopy studies. The electrochemical measurements in terms of galvanostatic cycling have shown that the approach presented in this study may enable to reach good rate capability and excellent cycling stability. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Powder Technology",
title = "Properties of quenched LiFePO4/C powder obtained via cellulose matrix-assisted method",
pages = "544-539",
volume = "246",
doi = "10.1016/j.powtec.2013.06.021"
}

Jugović, D., Mitrić, M., Milović, M., Jokić, B. M., Vukomanovic, M., Suvorov, D.,& Uskoković, D.. (2013). Properties of quenched LiFePO4/C powder obtained via cellulose matrix-assisted method. in Powder Technology, 246, 539-544.
https://doi.org/10.1016/j.powtec.2013.06.021

Jugović D, Mitrić M, Milović M, Jokić BM, Vukomanovic M, Suvorov D, Uskoković D. Properties of quenched LiFePO4/C powder obtained via cellulose matrix-assisted method. in Powder Technology. 2013;246:539-544.
doi:10.1016/j.powtec.2013.06.021 .

Jugović, Dragana, Mitrić, Miodrag, Milović, Miloš, Jokić, Bojan M., Vukomanovic, Marija, Suvorov, Danilo, Uskoković, Dragan, "Properties of quenched LiFePO4/C powder obtained via cellulose matrix-assisted method" in Powder Technology, 246 (2013):539-544,
https://doi.org/10.1016/j.powtec.2013.06.021 . .

TY  - JOUR
AU  - Stanković, Ana
AU  - Dimitrijević, Suzana
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2480
AB  - Metal oxide nanoparticles represent a new class of important materials that are increasingly being developed for use in research and health-related applications. Although the antibacterial activity and efficiency of bulk zinc oxide were investigated in vitro, the knowledge about the antibacterial activity of ZnO nanoparticles remains deficient. In this study, we have synthesized ZnO particles of different sizes and morphologies with the assistance of different types of surface stabilizing agents - polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and poly (alpha,gamma, L-glutamic acid) (PGA) - through a low-temperature hydrothermal procedure. The characterization of the prepared powders was preformed using X-ray diffraction (XRD) method and field emission scanning electron microscopy (FE SEM), as well as Malvern's Mastersizer instrument for particle size distribution. The specific surface area (SSA) of the ZnO powders was measured by standard Brunauer-Emmett-Teller (BET) technique. The antibacterial behavior of the synthesized ZnO particles was tested against gram-negative and gram-positive bacterial cultures, namely Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), respectively. We compared the results of the antibacterial properties of the synthesized ZnO samples with those of the commercial ZnO powder. According to the obtained results, the highest microbial cell reduction rate was recorded for the synthesized ZnO powder consisting of nanospherical particles. In all of the examined samples. ZnO particles demonstrated a significant bacteriostatic activity.
PB  - Elsevier Science Bv, Amsterdam
T2  - Colloids and Surfaces B-Biointerfaces
T1  - Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents
EP  - 28
SP  - 21
VL  - 102
DO  - 10.1016/j.colsurfb.2012.07.033
ER  - 

@article{
author = "Stanković, Ana and Dimitrijević, Suzana and Uskoković, Dragan",
year = "2013",
abstract = "Metal oxide nanoparticles represent a new class of important materials that are increasingly being developed for use in research and health-related applications. Although the antibacterial activity and efficiency of bulk zinc oxide were investigated in vitro, the knowledge about the antibacterial activity of ZnO nanoparticles remains deficient. In this study, we have synthesized ZnO particles of different sizes and morphologies with the assistance of different types of surface stabilizing agents - polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and poly (alpha,gamma, L-glutamic acid) (PGA) - through a low-temperature hydrothermal procedure. The characterization of the prepared powders was preformed using X-ray diffraction (XRD) method and field emission scanning electron microscopy (FE SEM), as well as Malvern's Mastersizer instrument for particle size distribution. The specific surface area (SSA) of the ZnO powders was measured by standard Brunauer-Emmett-Teller (BET) technique. The antibacterial behavior of the synthesized ZnO particles was tested against gram-negative and gram-positive bacterial cultures, namely Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), respectively. We compared the results of the antibacterial properties of the synthesized ZnO samples with those of the commercial ZnO powder. According to the obtained results, the highest microbial cell reduction rate was recorded for the synthesized ZnO powder consisting of nanospherical particles. In all of the examined samples. ZnO particles demonstrated a significant bacteriostatic activity.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Colloids and Surfaces B-Biointerfaces",
title = "Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents",
pages = "28-21",
volume = "102",
doi = "10.1016/j.colsurfb.2012.07.033"
}

Stanković, A., Dimitrijević, S.,& Uskoković, D.. (2013). Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents. in Colloids and Surfaces B-Biointerfaces
Elsevier Science Bv, Amsterdam., 102, 21-28.
https://doi.org/10.1016/j.colsurfb.2012.07.033

Stanković A, Dimitrijević S, Uskoković D. Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents. in Colloids and Surfaces B-Biointerfaces. 2013;102:21-28.
doi:10.1016/j.colsurfb.2012.07.033 .

Stanković, Ana, Dimitrijević, Suzana, Uskoković, Dragan, "Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents" in Colloids and Surfaces B-Biointerfaces, 102 (2013):21-28,
https://doi.org/10.1016/j.colsurfb.2012.07.033 . .

TY  - JOUR
AU  - Vukomanović, Marija
AU  - Škapin, Srečo Davor
AU  - Jančar, Boštjan
AU  - Maksin, Tatjana
AU  - Ignjatović, Nenad
AU  - Uskoković, Vuk
AU  - Uskoković, Dragan
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5650
AB  - Biodegradable poly(D,L-lactide-co-glycolide) (PLGA) and bioactive hydroxyapatite (HAP) are selected for the formation of a multifunctional system with the specific core-shell structure to be applied as a carrier of a drug. As a result, both components of PLGA/HAp core-shells are able to capture one part of the drug. Polymeric shells consisting of small nanospheres up to 20 nm in size act as a matrix in which one part of the drug is dispersed. In the same time, ceramic cores are formed of rod-like hydroxyapatite particles at the surface of which another part of the drug is adsorbed onto the interface between the polymer and the ceramics. The content of the loaded drug, as well as the selected solvent/non-solvent system, have a crucial influence on the resulting PLGA/HAp morphology and, finally, unimodal distribution of core-shells is obtained. The redistribution of the drug between the organic and inorganic parts of the material is expected to provide an interesting contribution to the kinetics of the drug release resulting in non-typical two-step drug release. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Colloids and Surfaces B: Biointerfaces
T1  - Poly(D,L-lactide-co-glycolide)/hydroxyapatite core-shell nanospheres. Part 1: A multifunctional system for controlled drug delivery
EP  - 413
IS  - 2
SP  - 404
VL  - 82
DO  - 10.1016/j.colsurfb.2010.09.011
UR  - https://hdl.handle.net/21.15107/rcub_dais_2749
ER  - 

@article{
author = "Vukomanović, Marija and Škapin, Srečo Davor and Jančar, Boštjan and Maksin, Tatjana and Ignjatović, Nenad and Uskoković, Vuk and Uskoković, Dragan",
year = "2011",
abstract = "Biodegradable poly(D,L-lactide-co-glycolide) (PLGA) and bioactive hydroxyapatite (HAP) are selected for the formation of a multifunctional system with the specific core-shell structure to be applied as a carrier of a drug. As a result, both components of PLGA/HAp core-shells are able to capture one part of the drug. Polymeric shells consisting of small nanospheres up to 20 nm in size act as a matrix in which one part of the drug is dispersed. In the same time, ceramic cores are formed of rod-like hydroxyapatite particles at the surface of which another part of the drug is adsorbed onto the interface between the polymer and the ceramics. The content of the loaded drug, as well as the selected solvent/non-solvent system, have a crucial influence on the resulting PLGA/HAp morphology and, finally, unimodal distribution of core-shells is obtained. The redistribution of the drug between the organic and inorganic parts of the material is expected to provide an interesting contribution to the kinetics of the drug release resulting in non-typical two-step drug release. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Colloids and Surfaces B: Biointerfaces",
title = "Poly(D,L-lactide-co-glycolide)/hydroxyapatite core-shell nanospheres. Part 1: A multifunctional system for controlled drug delivery",
pages = "413-404",
number = "2",
volume = "82",
doi = "10.1016/j.colsurfb.2010.09.011",
url = "https://hdl.handle.net/21.15107/rcub_dais_2749"
}

Vukomanović, M., Škapin, S. D., Jančar, B., Maksin, T., Ignjatović, N., Uskoković, V.,& Uskoković, D.. (2011). Poly(D,L-lactide-co-glycolide)/hydroxyapatite core-shell nanospheres. Part 1: A multifunctional system for controlled drug delivery. in Colloids and Surfaces B: Biointerfaces, 82(2), 404-413.
https://doi.org/10.1016/j.colsurfb.2010.09.011
https://hdl.handle.net/21.15107/rcub_dais_2749

Vukomanović M, Škapin SD, Jančar B, Maksin T, Ignjatović N, Uskoković V, Uskoković D. Poly(D,L-lactide-co-glycolide)/hydroxyapatite core-shell nanospheres. Part 1: A multifunctional system for controlled drug delivery. in Colloids and Surfaces B: Biointerfaces. 2011;82(2):404-413.
doi:10.1016/j.colsurfb.2010.09.011
https://hdl.handle.net/21.15107/rcub_dais_2749 .

Vukomanović, Marija, Škapin, Srečo Davor, Jančar, Boštjan, Maksin, Tatjana, Ignjatović, Nenad, Uskoković, Vuk, Uskoković, Dragan, "Poly(D,L-lactide-co-glycolide)/hydroxyapatite core-shell nanospheres. Part 1: A multifunctional system for controlled drug delivery" in Colloids and Surfaces B: Biointerfaces, 82, no. 2 (2011):404-413,
https://doi.org/10.1016/j.colsurfb.2010.09.011 .,
https://hdl.handle.net/21.15107/rcub_dais_2749 .

TY  - BOOK
AU  - Balać, Igor
AU  - Bugarski, Branko
AU  - Ćosić, Irena
AU  - Dramićanin, Miroslav
AU  - Đorđević, Drago
AU  - Filipović, Nenad D.
AU  - Ignjatović, Nenad
AU  - Janaćković, Đorđe
AU  - Kojić, Miloš
AU  - Manojlović, Verica
AU  - Marković, Zoran
AU  - Obradović, Bojana
AU  - Pajić-Lijaković, Ivana
AU  - Pavlović, Miodrag
AU  - Plavšić, Milenko B.
AU  - Raković, Dejan
AU  - Ranković, Vladimir
AU  - Stojanović, Boban
AU  - Trajković, Vladimir
AU  - Uskoković, Dragan
AU  - Uskoković, Petar
AU  - Veljković, Dejan
AU  - Vlastelica, Ivo
AU  - Vunjak-Novaković, Gordana
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1535
AB  - Početak XXI veka nesumnjivo je obeležen interdisciplinarnim i multidisciplinarnim naporima istraživača u različitim oblastima nauke. Jedna od najizrazitijih tendencija ovog tipa uočava se u biomedicinskim istraživanjima, gde se združuju napori lekara, biologa, genetičara i biohemičara, s jedne strane, i biofizičara i inženjera, s druge strane – sa ciljem dubljeg razumevanja zdravlja i bolesti, i primene ovih saznanja u biomedicinskoj praksi, tako važnoj u svakodnevnom životu ljudi. Kao rezultat ovih svetskih trendova, u Srbiji već više godina na nekoliko fakulteta postoji nastava iz oblasti biomedicinskog inženjerstva, sa ciljem da osposobi inženjere ovih usmerenja za multidisciplinarno povezivanje znanja iz oblasti tehnike sa biomedicinskim znanjima. Jedan od bazičnih predmeta ovih usmerenja jesu Biomaterijali, kojima je i posvećen naš udžbenik, čiji je cilj da predstavi pregled teorije i prakse biomaterijala u biomedicinskoj nauci. Nauka o biomaterijalima je nesumnjivo najmultidisciplinarnija od svih nauka, jer zahteva ovladavanje znanjima iz mnogih oblasti nauke i tehnologije, inženjerstva i medicine, kako bi naučnici iz oblasti biomaterijala mogli da se uhvate u koštac sa ovom profesijom. Zato posle uvodnog dela, udžbenik iz Biomaterijala sadrži četiri celine: (I) Osnovni biomedicinski koncepti i reakcije organizma na biomaterijale, (II) Struktura, fizičko-mehanička karakterizacija i modeliranje biomaterijala i tkiva, (III) Savremeni biomaterijali i tehnologije, (IV) Perspektive biomaterijala i tehnologija, iza kojih slede Zadaci sa rešenjima, Ispitna test pitanja i Ispitna teorijska pitanja, koji pomažu studentima da lakše savladaju veoma obimno i kompleksno gradivo. Na kraju svakog poglavlja data su pitanja za rekapitulaciju, kao i spisak dopunske literature za opcionu detaljniju obradu pojedinih oblasti. Grupa od dvadeset četiri profesionalca sa univerziteta i naučnih instituta, pod okriljem Instituta tehničkih nauka Srpske akademije nauka i umetnosti, Beograd, i Društva za istraživanje materijala Srbije (MRS Srbija) doprinela je pisanju ovog kapitalnog udžbenika o biomaterijalima, prvog do sada na srpskom jeziku. Mada uključivanje veće grupe autora nužno dovodi do stilske neujednačenosti, ipak je oblast biomaterijala toliko multidisciplinarna da je ovakav pristup bio neophodan, kako uostalom pokazuju slična svetska iskustva sa uključivanjem i preko pedeset autora. Ipak urednici su se potrudili da koliko je to moguće stilski i pedagoški ujednače udžbenik, kako bi bio korisna literatura za sve studente diplomskih, master i doktorskih studija iz biomedicinskog inženjerstva u Srbiji i okruženju.
PB  - Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala
T1  - Biomaterijali
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7344
ER  - 

@book{
author = "Balać, Igor and Bugarski, Branko and Ćosić, Irena and Dramićanin, Miroslav and Đorđević, Drago and Filipović, Nenad D. and Ignjatović, Nenad and Janaćković, Đorđe and Kojić, Miloš and Manojlović, Verica and Marković, Zoran and Obradović, Bojana and Pajić-Lijaković, Ivana and Pavlović, Miodrag and Plavšić, Milenko B. and Raković, Dejan and Ranković, Vladimir and Stojanović, Boban and Trajković, Vladimir and Uskoković, Dragan and Uskoković, Petar and Veljković, Dejan and Vlastelica, Ivo and Vunjak-Novaković, Gordana",
year = "2010",
abstract = "Početak XXI veka nesumnjivo je obeležen interdisciplinarnim i multidisciplinarnim naporima istraživača u različitim oblastima nauke. Jedna od najizrazitijih tendencija ovog tipa uočava se u biomedicinskim istraživanjima, gde se združuju napori lekara, biologa, genetičara i biohemičara, s jedne strane, i biofizičara i inženjera, s druge strane – sa ciljem dubljeg razumevanja zdravlja i bolesti, i primene ovih saznanja u biomedicinskoj praksi, tako važnoj u svakodnevnom životu ljudi. Kao rezultat ovih svetskih trendova, u Srbiji već više godina na nekoliko fakulteta postoji nastava iz oblasti biomedicinskog inženjerstva, sa ciljem da osposobi inženjere ovih usmerenja za multidisciplinarno povezivanje znanja iz oblasti tehnike sa biomedicinskim znanjima. Jedan od bazičnih predmeta ovih usmerenja jesu Biomaterijali, kojima je i posvećen naš udžbenik, čiji je cilj da predstavi pregled teorije i prakse biomaterijala u biomedicinskoj nauci. Nauka o biomaterijalima je nesumnjivo najmultidisciplinarnija od svih nauka, jer zahteva ovladavanje znanjima iz mnogih oblasti nauke i tehnologije, inženjerstva i medicine, kako bi naučnici iz oblasti biomaterijala mogli da se uhvate u koštac sa ovom profesijom. Zato posle uvodnog dela, udžbenik iz Biomaterijala sadrži četiri celine: (I) Osnovni biomedicinski koncepti i reakcije organizma na biomaterijale, (II) Struktura, fizičko-mehanička karakterizacija i modeliranje biomaterijala i tkiva, (III) Savremeni biomaterijali i tehnologije, (IV) Perspektive biomaterijala i tehnologija, iza kojih slede Zadaci sa rešenjima, Ispitna test pitanja i Ispitna teorijska pitanja, koji pomažu studentima da lakše savladaju veoma obimno i kompleksno gradivo. Na kraju svakog poglavlja data su pitanja za rekapitulaciju, kao i spisak dopunske literature za opcionu detaljniju obradu pojedinih oblasti. Grupa od dvadeset četiri profesionalca sa univerziteta i naučnih instituta, pod okriljem Instituta tehničkih nauka Srpske akademije nauka i umetnosti, Beograd, i Društva za istraživanje materijala Srbije (MRS Srbija) doprinela je pisanju ovog kapitalnog udžbenika o biomaterijalima, prvog do sada na srpskom jeziku. Mada uključivanje veće grupe autora nužno dovodi do stilske neujednačenosti, ipak je oblast biomaterijala toliko multidisciplinarna da je ovakav pristup bio neophodan, kako uostalom pokazuju slična svetska iskustva sa uključivanjem i preko pedeset autora. Ipak urednici su se potrudili da koliko je to moguće stilski i pedagoški ujednače udžbenik, kako bi bio korisna literatura za sve studente diplomskih, master i doktorskih studija iz biomedicinskog inženjerstva u Srbiji i okruženju.",
publisher = "Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala",
title = "Biomaterijali",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7344"
}

Balać, I., Bugarski, B., Ćosić, I., Dramićanin, M., Đorđević, D., Filipović, N. D., Ignjatović, N., Janaćković, Đ., Kojić, M., Manojlović, V., Marković, Z., Obradović, B., Pajić-Lijaković, I., Pavlović, M., Plavšić, M. B., Raković, D., Ranković, V., Stojanović, B., Trajković, V., Uskoković, D., Uskoković, P., Veljković, D., Vlastelica, I.,& Vunjak-Novaković, G.. (2010). Biomaterijali. 
Beograd : Institut tehničkih nauka Srpske akademije nauka i umetnosti; Društvo za istraživanje materijala..
https://hdl.handle.net/21.15107/rcub_vinar_7344

Balać I, Bugarski B, Ćosić I, Dramićanin M, Đorđević D, Filipović ND, Ignjatović N, Janaćković Đ, Kojić M, Manojlović V, Marković Z, Obradović B, Pajić-Lijaković I, Pavlović M, Plavšić MB, Raković D, Ranković V, Stojanović B, Trajković V, Uskoković D, Uskoković P, Veljković D, Vlastelica I, Vunjak-Novaković G. Biomaterijali. 2010;.
https://hdl.handle.net/21.15107/rcub_vinar_7344 .

Balać, Igor, Bugarski, Branko, Ćosić, Irena, Dramićanin, Miroslav, Đorđević, Drago, Filipović, Nenad D., Ignjatović, Nenad, Janaćković, Đorđe, Kojić, Miloš, Manojlović, Verica, Marković, Zoran, Obradović, Bojana, Pajić-Lijaković, Ivana, Pavlović, Miodrag, Plavšić, Milenko B., Raković, Dejan, Ranković, Vladimir, Stojanović, Boban, Trajković, Vladimir, Uskoković, Dragan, Uskoković, Petar, Veljković, Dejan, Vlastelica, Ivo, Vunjak-Novaković, Gordana, "Biomaterijali" (2010),
https://hdl.handle.net/21.15107/rcub_vinar_7344 .

TY  - JOUR
AU  - Aleksendrić, D.
AU  - Balać, Igor
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Uskoković, Petar
AU  - Uskoković, Dragan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1702
AB  - In this paper, the mechanical properties of polymer matrix phase (modulus of elasticity, yield stress and work hardening rate) have been determined using combined methods such as nanoindentation, finite element modelling and artificial neural networks. The approach of neural modelling has been employed for the functional approximation of the nanoindentation load-displacement curves. The data obtained from finite element analyses have been used for the artificial neural networks training and validating. The neural model of polymer matrix phase of poly-L-lactide (PLLA) polymer in hydroxyapatite (HAp)/PLLA mechanical behaviour has been developed and tested versus unknown data related to the load-displacement curves that were not used during the neural network training. Based on this neural model, the nanoindentation matrix phase properties of PLLA polymer in HAp/PLLA composite have been predicted.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Advances in Applied Ceramics
T1  - Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks
EP  - 70
IS  - 2
SP  - 65
VL  - 109
DO  - 10.1179/174367509X12502621261613
ER  - 

@article{
author = "Aleksendrić, D. and Balać, Igor and Tang, C. Y. and Tsui, C. P. and Uskoković, Petar and Uskoković, Dragan",
year = "2010",
abstract = "In this paper, the mechanical properties of polymer matrix phase (modulus of elasticity, yield stress and work hardening rate) have been determined using combined methods such as nanoindentation, finite element modelling and artificial neural networks. The approach of neural modelling has been employed for the functional approximation of the nanoindentation load-displacement curves. The data obtained from finite element analyses have been used for the artificial neural networks training and validating. The neural model of polymer matrix phase of poly-L-lactide (PLLA) polymer in hydroxyapatite (HAp)/PLLA mechanical behaviour has been developed and tested versus unknown data related to the load-displacement curves that were not used during the neural network training. Based on this neural model, the nanoindentation matrix phase properties of PLLA polymer in HAp/PLLA composite have been predicted.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Advances in Applied Ceramics",
title = "Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks",
pages = "70-65",
number = "2",
volume = "109",
doi = "10.1179/174367509X12502621261613"
}

Aleksendrić, D., Balać, I., Tang, C. Y., Tsui, C. P., Uskoković, P.,& Uskoković, D.. (2010). Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks. in Advances in Applied Ceramics
Taylor & Francis Ltd, Abingdon., 109(2), 65-70.
https://doi.org/10.1179/174367509X12502621261613

Aleksendrić D, Balać I, Tang CY, Tsui CP, Uskoković P, Uskoković D. Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks. in Advances in Applied Ceramics. 2010;109(2):65-70.
doi:10.1179/174367509X12502621261613 .

Aleksendrić, D., Balać, Igor, Tang, C. Y., Tsui, C. P., Uskoković, Petar, Uskoković, Dragan, "Surface characterisation of PLLA polymer in HAp/PLLA biocomposite material by means of nanoindentation and artificial neural networks" in Advances in Applied Ceramics, 109, no. 2 (2010):65-70,
https://doi.org/10.1179/174367509X12502621261613 . .

TY  - CONF
AU  - Stanković, Ana
AU  - Stojanović, Zoran S.
AU  - Veselinović, Ljiljana
AU  - Dimitrijević, Suzana
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1576
AB  - Poster presented at the 12th Annual Conference of the Materials Research Society of Serbia - YUCOMAT 2010, Herceg Novi, Montenegro, September 6–10, 2010
T1  - Influence of size scale and morphology on antibacterial properties of ZnO nanoparticles
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7363
ER  - 

@conference{
author = "Stanković, Ana and Stojanović, Zoran S. and Veselinović, Ljiljana and Dimitrijević, Suzana and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2010",
abstract = "Poster presented at the 12th Annual Conference of the Materials Research Society of Serbia - YUCOMAT 2010, Herceg Novi, Montenegro, September 6–10, 2010",
title = "Influence of size scale and morphology on antibacterial properties of ZnO nanoparticles",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7363"
}

Stanković, A., Stojanović, Z. S., Veselinović, L., Dimitrijević, S., Škapin, S. D.,& Uskoković, D.. (2010). Influence of size scale and morphology on antibacterial properties of ZnO nanoparticles. .
https://hdl.handle.net/21.15107/rcub_vinar_7363

Stanković A, Stojanović ZS, Veselinović L, Dimitrijević S, Škapin SD, Uskoković D. Influence of size scale and morphology on antibacterial properties of ZnO nanoparticles. 2010;.
https://hdl.handle.net/21.15107/rcub_vinar_7363 .

Stanković, Ana, Stojanović, Zoran S., Veselinović, Ljiljana, Dimitrijević, Suzana, Škapin, Srečo Davor, Uskoković, Dragan, "Influence of size scale and morphology on antibacterial properties of ZnO nanoparticles" (2010),
https://hdl.handle.net/21.15107/rcub_vinar_7363 .

TY  - JOUR
AU  - Suljovrujić, Edin H.
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
AU  - Mitrić, Miodrag
AU  - Mitrovic, M.
AU  - Tomić, Simonida
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5495
AB  - The effects of gamma irradiation on the structure and properties of hydroxyapatite/poly L-lactide (HAp/PLLA) biomaterial have been investigated. Effects of radiation on microstructure, degradation of polymer part and thermal stability of composite were determined by scanning electronic microscopy (SEM), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA), respectively. Mechanical properties were obtained through mechanical strength and elasticity modulus. Presented results show that properties of HAp/PLLA decay with irradiation dose, but for doses required for sterilization, changes and damaging effects are acceptable. (C) 2006 Elsevier Ltd. All rights reserved.
T2  - Radiation Physics and Chemistry
T1  - Radiation-induced degradation of hydroxyapatite/poly L-lactide composite biomaterial
EP  - 728
IS  - 4
SP  - 722
VL  - 76
DO  - 10.1016/j.radphyschem.2006.02.013
UR  - https://hdl.handle.net/21.15107/rcub_dais_2752
ER  - 

@article{
author = "Suljovrujić, Edin H. and Ignjatović, Nenad and Uskoković, Dragan and Mitrić, Miodrag and Mitrovic, M. and Tomić, Simonida",
year = "2007",
abstract = "The effects of gamma irradiation on the structure and properties of hydroxyapatite/poly L-lactide (HAp/PLLA) biomaterial have been investigated. Effects of radiation on microstructure, degradation of polymer part and thermal stability of composite were determined by scanning electronic microscopy (SEM), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA), respectively. Mechanical properties were obtained through mechanical strength and elasticity modulus. Presented results show that properties of HAp/PLLA decay with irradiation dose, but for doses required for sterilization, changes and damaging effects are acceptable. (C) 2006 Elsevier Ltd. All rights reserved.",
journal = "Radiation Physics and Chemistry",
title = "Radiation-induced degradation of hydroxyapatite/poly L-lactide composite biomaterial",
pages = "728-722",
number = "4",
volume = "76",
doi = "10.1016/j.radphyschem.2006.02.013",
url = "https://hdl.handle.net/21.15107/rcub_dais_2752"
}

Suljovrujić, E. H., Ignjatović, N., Uskoković, D., Mitrić, M., Mitrovic, M.,& Tomić, S.. (2007). Radiation-induced degradation of hydroxyapatite/poly L-lactide composite biomaterial. in Radiation Physics and Chemistry, 76(4), 722-728.
https://doi.org/10.1016/j.radphyschem.2006.02.013
https://hdl.handle.net/21.15107/rcub_dais_2752

Suljovrujić EH, Ignjatović N, Uskoković D, Mitrić M, Mitrovic M, Tomić S. Radiation-induced degradation of hydroxyapatite/poly L-lactide composite biomaterial. in Radiation Physics and Chemistry. 2007;76(4):722-728.
doi:10.1016/j.radphyschem.2006.02.013
https://hdl.handle.net/21.15107/rcub_dais_2752 .

Suljovrujić, Edin H., Ignjatović, Nenad, Uskoković, Dragan, Mitrić, Miodrag, Mitrovic, M., Tomić, Simonida, "Radiation-induced degradation of hydroxyapatite/poly L-lactide composite biomaterial" in Radiation Physics and Chemistry, 76, no. 4 (2007):722-728,
https://doi.org/10.1016/j.radphyschem.2006.02.013 .,
https://hdl.handle.net/21.15107/rcub_dais_2752 .

TY  - JOUR
AU  - Uskoković, Petar
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1119
AB  - Biocomposites with ceramic fillers and polymer matrix are becoming attractive materials for bone tissue replacements. Nanoindentation has been used to locally characterize the surface mechanical properties of the hydroxyapatite/pOly-L-lactide (HAp/PLLA) biocomposite. Additionally, differences in the mechanical properties of HAP phase were successfully characterized as a function of surface morphology by using a highresolution modulus mapping technique. HAP granules consist of agglomerates of grainy clusters. Mechanical properties of ceramic grains and PLLA are in fair agreement with literature data. High-resolution methods were able to measure the properties of boundary phases between grains and the pore regions between particles in the agglomerate. After short-time immersion in distilled water, material surface showed a large decrease in storage modulus.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of the European Ceramic Society
T1  - Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping
EP  - 1564
IS  - 2-3
SP  - 1559
VL  - 27
DO  - 10.1016/j.jeurceramsoc.2006.04.122
ER  - 

@article{
author = "Uskoković, Petar and Tang, C. Y. and Tsui, C. P. and Ignjatović, Nenad and Uskoković, Dragan",
year = "2007",
abstract = "Biocomposites with ceramic fillers and polymer matrix are becoming attractive materials for bone tissue replacements. Nanoindentation has been used to locally characterize the surface mechanical properties of the hydroxyapatite/pOly-L-lactide (HAp/PLLA) biocomposite. Additionally, differences in the mechanical properties of HAP phase were successfully characterized as a function of surface morphology by using a highresolution modulus mapping technique. HAP granules consist of agglomerates of grainy clusters. Mechanical properties of ceramic grains and PLLA are in fair agreement with literature data. High-resolution methods were able to measure the properties of boundary phases between grains and the pore regions between particles in the agglomerate. After short-time immersion in distilled water, material surface showed a large decrease in storage modulus.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of the European Ceramic Society",
title = "Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping",
pages = "1564-1559",
number = "2-3",
volume = "27",
doi = "10.1016/j.jeurceramsoc.2006.04.122"
}

Uskoković, P., Tang, C. Y., Tsui, C. P., Ignjatović, N.,& Uskoković, D.. (2007). Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping. in Journal of the European Ceramic Society
Elsevier Sci Ltd, Oxford., 27(2-3), 1559-1564.
https://doi.org/10.1016/j.jeurceramsoc.2006.04.122

Uskoković P, Tang CY, Tsui CP, Ignjatović N, Uskoković D. Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping. in Journal of the European Ceramic Society. 2007;27(2-3):1559-1564.
doi:10.1016/j.jeurceramsoc.2006.04.122 .

Uskoković, Petar, Tang, C. Y., Tsui, C. P., Ignjatović, Nenad, Uskoković, Dragan, "Micromechanical properties of a hydroxyapatite/poly-L-lactide biocomposite using nanoindentation and modulus mapping" in Journal of the European Ceramic Society, 27, no. 2-3 (2007):1559-1564,
https://doi.org/10.1016/j.jeurceramsoc.2006.04.122 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Aleksendrić, D.
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Uskoković, Petar
AU  - Uskoković, Dragan
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1044
AB  - In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. Knowing these properties is important since the processing conditions used in hot pressing of composites with thermoplastic matrix strongly influence final mechanical properties of material in the solid state. A bi-linear material behavior is adopted for the polymer phase of the HAp/PLLA composite. Material behavior model, stress-strain curve, is determined by modulus of elasticity, yield stress and work-hardening rate. This combined method is proposed to determine material behavior before (modulus of elasticity) and after yield point (work hardening rate) of polymer phase after the hot-pressing of the composite. .
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method
EP  - 286
IS  - 4
SP  - 277
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1044
ER  - 

@article{
author = "Balać, Igor and Aleksendrić, D. and Tang, C. Y. and Tsui, C. P. and Uskoković, Petar and Uskoković, Dragan",
year = "2007",
abstract = "In this work, a combination of nanoindentation experiment and finite element modeling is proposed in order to obtain approximate material behavior of PLLA polymer in hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite. Knowing these properties is important since the processing conditions used in hot pressing of composites with thermoplastic matrix strongly influence final mechanical properties of material in the solid state. A bi-linear material behavior is adopted for the polymer phase of the HAp/PLLA composite. Material behavior model, stress-strain curve, is determined by modulus of elasticity, yield stress and work-hardening rate. This combined method is proposed to determine material behavior before (modulus of elasticity) and after yield point (work hardening rate) of polymer phase after the hot-pressing of the composite. .",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method",
pages = "286-277",
number = "4",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1044"
}

Balać, I., Aleksendrić, D., Tang, C. Y., Tsui, C. P., Uskoković, P.,& Uskoković, D.. (2007). Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 13(4), 277-286.
https://hdl.handle.net/21.15107/rcub_technorep_1044

Balać I, Aleksendrić D, Tang CY, Tsui CP, Uskoković P, Uskoković D. Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method. in Metalurgija. 2007;13(4):277-286.
https://hdl.handle.net/21.15107/rcub_technorep_1044 .

Balać, Igor, Aleksendrić, D., Tang, C. Y., Tsui, C. P., Uskoković, Petar, Uskoković, Dragan, "Approximation of material behaviour of PLLA polymer in HAp/PLLA biocomposite material using nanoindentation and finite element method" in Metalurgija, 13, no. 4 (2007):277-286,
https://hdl.handle.net/21.15107/rcub_technorep_1044 .

TY  - JOUR
AU  - Balać, Igor
AU  - Tang, C. Y.
AU  - Tsui, C. P.
AU  - Chen, D. Z.
AU  - Uskoković, Petar
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/986
AB  - In order to obtain more accurate properties after compaction of hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite, high-resolution measurement of mechanical properties method is proposed to determine the properties of each phase separately, leading to information that are valuable for the development of new materials as well as for predictive modeling purposes. The PLLA polymer processing conditions used in hot pressing of the composite strongly influence final mechanical properties of the material in the solid state. Since the aim was to measure PLLA material properties, acceptable findings could only be made using unconstrained, cured in situ nanoindentation tests. A finite element analysis of the in situ indentation experiment was performed to determine required size of plain polymer area, needed for indentation test, which would minimize the particle influence on the matrix elastic behavior.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Recent Developments in Advanced Materials and Processes
T1  - Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites
EP  - 506
SP  - 501
VL  - 518
DO  - 10.4028/www.scientific.net/MSF.518.501
ER  - 

@article{
author = "Balać, Igor and Tang, C. Y. and Tsui, C. P. and Chen, D. Z. and Uskoković, Petar and Ignjatović, Nenad and Uskoković, Dragan",
year = "2006",
abstract = "In order to obtain more accurate properties after compaction of hydroxyapatite (HAp)/poly-L-lactide (PLLA) composite, high-resolution measurement of mechanical properties method is proposed to determine the properties of each phase separately, leading to information that are valuable for the development of new materials as well as for predictive modeling purposes. The PLLA polymer processing conditions used in hot pressing of the composite strongly influence final mechanical properties of the material in the solid state. Since the aim was to measure PLLA material properties, acceptable findings could only be made using unconstrained, cured in situ nanoindentation tests. A finite element analysis of the in situ indentation experiment was performed to determine required size of plain polymer area, needed for indentation test, which would minimize the particle influence on the matrix elastic behavior.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Recent Developments in Advanced Materials and Processes",
title = "Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites",
pages = "506-501",
volume = "518",
doi = "10.4028/www.scientific.net/MSF.518.501"
}

Balać, I., Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, P., Ignjatović, N.,& Uskoković, D.. (2006). Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites. in Recent Developments in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 518, 501-506.
https://doi.org/10.4028/www.scientific.net/MSF.518.501

Balać I, Tang CY, Tsui CP, Chen DZ, Uskoković P, Ignjatović N, Uskoković D. Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites. in Recent Developments in Advanced Materials and Processes. 2006;518:501-506.
doi:10.4028/www.scientific.net/MSF.518.501 .

Balać, Igor, Tang, C. Y., Tsui, C. P., Chen, D. Z., Uskoković, Petar, Ignjatović, Nenad, Uskoković, Dragan, "Nanoindentation of in situ polymers in hydroxyapatite/poly-L-lactide biocomposites" in Recent Developments in Advanced Materials and Processes, 518 (2006):501-506,
https://doi.org/10.4028/www.scientific.net/MSF.518.501 . .

TY  - JOUR
AU  - Vukašinović-Milić, Tatjana
AU  - Miličević, Dejan S.
AU  - Mićić, Maja M.
AU  - Trifunović, Saša
AU  - Suljovrujić, Edin H.
AU  - Tomić, Simonida
AU  - Ignjatović, Nenad
AU  - Uskoković, Dragan
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/925
AB  - The effects of gamma irradiation on the structure and properties of hydroxyapatite/poly- Llactide (HAp/PLLA) biomaterial have been investigated. Effects of radiation on microstructure, degradation of polymer part and thermal stability of composite were determined by scanning electronic microscopy (SEM), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA), respectively. Mechanical properties were obtained through mechanical strength and elasticity modulus. Presented results show that properties of HAp/PLLA decay with irradiation dose, but for doses required for sterilization, changes and damaging effects are acceptable.
AB  - Ispitivan je uticaj γ-zračenja na strukturu i osobine hidroksiapatit/poli-L-laktida (Hap/PLLA). Uticaj zračenja na mikrostrukturu degradaciju polimera i termičku stabilanost kompozita određivani su skenirajućom elektronskom mikroskopijom (SEM), gel-propusnom hromatografijom (GPH) i termogravimetrijskom analizom (TGA), respektivno. Mehaničke osobine su određene na osnovu mehaničke čvrstoće i modula elastičnosti. Dobijeni rezultati pokazuju slabljenje osobina HAp/PLLA sa povećanjem doze zračenja. Za doze zračenja pri kojima se odvija sterilizacija, promene i efekti oštećenja su prihvatljivi.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika - Novi materijali
T1  - Sterilization of hydroxyapatite/poly-L-lactide composite biomaterial by gamma irradiation
T1  - Sterilizacija hidroksiapatit/poli-L-laktid kompozitnog biomaterijala dejstvom γ-zračenja
EP  - 14
IS  - 4
SP  - 9
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_925
ER  - 

@article{
author = "Vukašinović-Milić, Tatjana and Miličević, Dejan S. and Mićić, Maja M. and Trifunović, Saša and Suljovrujić, Edin H. and Tomić, Simonida and Ignjatović, Nenad and Uskoković, Dragan",
year = "2006",
abstract = "The effects of gamma irradiation on the structure and properties of hydroxyapatite/poly- Llactide (HAp/PLLA) biomaterial have been investigated. Effects of radiation on microstructure, degradation of polymer part and thermal stability of composite were determined by scanning electronic microscopy (SEM), gel permeation chromatography (GPC) and thermogravimetric analysis (TGA), respectively. Mechanical properties were obtained through mechanical strength and elasticity modulus. Presented results show that properties of HAp/PLLA decay with irradiation dose, but for doses required for sterilization, changes and damaging effects are acceptable., Ispitivan je uticaj γ-zračenja na strukturu i osobine hidroksiapatit/poli-L-laktida (Hap/PLLA). Uticaj zračenja na mikrostrukturu degradaciju polimera i termičku stabilanost kompozita određivani su skenirajućom elektronskom mikroskopijom (SEM), gel-propusnom hromatografijom (GPH) i termogravimetrijskom analizom (TGA), respektivno. Mehaničke osobine su određene na osnovu mehaničke čvrstoće i modula elastičnosti. Dobijeni rezultati pokazuju slabljenje osobina HAp/PLLA sa povećanjem doze zračenja. Za doze zračenja pri kojima se odvija sterilizacija, promene i efekti oštećenja su prihvatljivi.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika - Novi materijali",
title = "Sterilization of hydroxyapatite/poly-L-lactide composite biomaterial by gamma irradiation, Sterilizacija hidroksiapatit/poli-L-laktid kompozitnog biomaterijala dejstvom γ-zračenja",
pages = "14-9",
number = "4",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_925"
}

Vukašinović-Milić, T., Miličević, D. S., Mićić, M. M., Trifunović, S., Suljovrujić, E. H., Tomić, S., Ignjatović, N.,& Uskoković, D.. (2006). Sterilization of hydroxyapatite/poly-L-lactide composite biomaterial by gamma irradiation. in Tehnika - Novi materijali
Savez inženjera i tehničara Srbije, Beograd., 15(4), 9-14.
https://hdl.handle.net/21.15107/rcub_technorep_925

Vukašinović-Milić T, Miličević DS, Mićić MM, Trifunović S, Suljovrujić EH, Tomić S, Ignjatović N, Uskoković D. Sterilization of hydroxyapatite/poly-L-lactide composite biomaterial by gamma irradiation. in Tehnika - Novi materijali. 2006;15(4):9-14.
https://hdl.handle.net/21.15107/rcub_technorep_925 .

Vukašinović-Milić, Tatjana, Miličević, Dejan S., Mićić, Maja M., Trifunović, Saša, Suljovrujić, Edin H., Tomić, Simonida, Ignjatović, Nenad, Uskoković, Dragan, "Sterilization of hydroxyapatite/poly-L-lactide composite biomaterial by gamma irradiation" in Tehnika - Novi materijali, 15, no. 4 (2006):9-14,
https://hdl.handle.net/21.15107/rcub_technorep_925 .

TY  - JOUR
AU  - Balać, Igor
AU  - Milovancević, M
AU  - Tang, C. Y.
AU  - Uskoković, Petar
AU  - Uskoković, Dragan
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/708
AB  - A three-dimensional (31)) finite element (FE) unit cell model is applied to studies on the elastic properties of ceramic spherical particle-polymer composite. In this model, hydroxyapatite particles (HAp) are assumed to be spherical and are arranged on a face-centered cubic (FCC) array in poly-L-lactide (PLLA) matrix surrounding. The three dimensionality of the proposed model enables simulation of elastic properties as well as developed stress states. The FE calculations provide estimates of compressive elastic modulus, shear modulus, Poisson's ratio and stress state of the composite for a range of particle volume fractions. The FCC unit cell FE models are evaluated by comparison to available experimental results, simple cubic (SC) unit cell FE calculations and Halpin-Tsai equations. In applying unit cell models for predicting elastic properties of particle-filled composites, the FCC arrangement can be observed to be more accurate compared with the SC arrangement.
PB  - Elsevier, Amsterdam
T2  - Materials Letters
T1  - Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model
EP  - 2441
IS  - 19
SP  - 2437
VL  - 58
DO  - 10.1016/j.matlet.2004.02.033
ER  - 

@article{
author = "Balać, Igor and Milovancević, M and Tang, C. Y. and Uskoković, Petar and Uskoković, Dragan",
year = "2004",
abstract = "A three-dimensional (31)) finite element (FE) unit cell model is applied to studies on the elastic properties of ceramic spherical particle-polymer composite. In this model, hydroxyapatite particles (HAp) are assumed to be spherical and are arranged on a face-centered cubic (FCC) array in poly-L-lactide (PLLA) matrix surrounding. The three dimensionality of the proposed model enables simulation of elastic properties as well as developed stress states. The FE calculations provide estimates of compressive elastic modulus, shear modulus, Poisson's ratio and stress state of the composite for a range of particle volume fractions. The FCC unit cell FE models are evaluated by comparison to available experimental results, simple cubic (SC) unit cell FE calculations and Halpin-Tsai equations. In applying unit cell models for predicting elastic properties of particle-filled composites, the FCC arrangement can be observed to be more accurate compared with the SC arrangement.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Letters",
title = "Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model",
pages = "2441-2437",
number = "19",
volume = "58",
doi = "10.1016/j.matlet.2004.02.033"
}

Balać, I., Milovancević, M., Tang, C. Y., Uskoković, P.,& Uskoković, D.. (2004). Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model. in Materials Letters
Elsevier, Amsterdam., 58(19), 2437-2441.
https://doi.org/10.1016/j.matlet.2004.02.033

Balać I, Milovancević M, Tang CY, Uskoković P, Uskoković D. Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model. in Materials Letters. 2004;58(19):2437-2441.
doi:10.1016/j.matlet.2004.02.033 .

Balać, Igor, Milovancević, M, Tang, C. Y., Uskoković, Petar, Uskoković, Dragan, "Estimation of elastic properties of a particulate polymer composite using a face-centered cubic FE model" in Materials Letters, 58, no. 19 (2004):2437-2441,
https://doi.org/10.1016/j.matlet.2004.02.033 . .

TY  - CONF
AU  - Ignjatović, Nenad
AU  - Nastasović, Aleksandra
AU  - Laninović, Verica
AU  - Onjia, Antonije
AU  - Miljković, Milena
AU  - Uskoković, Dragan
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7196
AB  - Bioresorbable barrier membranes are widely used in dentistry and maxillofacial
surgery. When the membranes are placed over bony defects and closely adapted to the
surrounding bone face, an environment that prevents invasion of competing nonosteogenetic
cells from the overlying soft tissues can be created. The purpose of the present study was to
establish whether there is an influence of production of different polymeric and composite
membranes on physico-chemical properties, synthetised in our laboratory.
 Physico-chemical properties were analyzed by differential scanning calorimetry
(DSC), scanning electron microscopy (SEM) with energetic dispersive spectroscopy (EDS),
inverse gas chromatography (IGC) and tensile strength test (TST).
 Membranes with poly-l-lactides of 100000 and 430000 g/mol molecular weight have
shown the highest degree of crystallinity. Membranes with poly-l-lactides of the greatest
molecular weight have shown the highest tensile strength value, as expected. Surface
microstructure, depending on the parameters of processing, was perforated with smaller or larger
pores. Composite membranes with hydroxyapatite have a brittle fracture while determining
tensile strength test, unlike polymer membranes whose fracture is classical for polymers.
 Biocompatibility is in the direct connection with surface free energy. Consequently,
obtained surface free energy values indicate good biocompatibility of bioresorbable barrier
membranes.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Programme and the Book of Abstracts / The Fifth Yugoslav Materials Research Society Conference YUCOMAT 2003, Herceg Novi, September, 15-19, 2003
T1  - Physico-chemical properties of polymeric and composite bioresorbable barrier membranes
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7196
ER  - 

@conference{
author = "Ignjatović, Nenad and Nastasović, Aleksandra and Laninović, Verica and Onjia, Antonije and Miljković, Milena and Uskoković, Dragan",
year = "2003",
abstract = "Bioresorbable barrier membranes are widely used in dentistry and maxillofacial
surgery. When the membranes are placed over bony defects and closely adapted to the
surrounding bone face, an environment that prevents invasion of competing nonosteogenetic
cells from the overlying soft tissues can be created. The purpose of the present study was to
establish whether there is an influence of production of different polymeric and composite
membranes on physico-chemical properties, synthetised in our laboratory.
 Physico-chemical properties were analyzed by differential scanning calorimetry
(DSC), scanning electron microscopy (SEM) with energetic dispersive spectroscopy (EDS),
inverse gas chromatography (IGC) and tensile strength test (TST).
 Membranes with poly-l-lactides of 100000 and 430000 g/mol molecular weight have
shown the highest degree of crystallinity. Membranes with poly-l-lactides of the greatest
molecular weight have shown the highest tensile strength value, as expected. Surface
microstructure, depending on the parameters of processing, was perforated with smaller or larger
pores. Composite membranes with hydroxyapatite have a brittle fracture while determining
tensile strength test, unlike polymer membranes whose fracture is classical for polymers.
 Biocompatibility is in the direct connection with surface free energy. Consequently,
obtained surface free energy values indicate good biocompatibility of bioresorbable barrier
membranes.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Programme and the Book of Abstracts / The Fifth Yugoslav Materials Research Society Conference YUCOMAT 2003, Herceg Novi, September, 15-19, 2003",
title = "Physico-chemical properties of polymeric and composite bioresorbable barrier membranes",
pages = "51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7196"
}

Ignjatović, N., Nastasović, A., Laninović, V., Onjia, A., Miljković, M.,& Uskoković, D.. (2003). Physico-chemical properties of polymeric and composite bioresorbable barrier membranes. in Programme and the Book of Abstracts / The Fifth Yugoslav Materials Research Society Conference YUCOMAT 2003, Herceg Novi, September, 15-19, 2003
Belgrade : Institute of Technical Sciences of SASA., 51.
https://hdl.handle.net/21.15107/rcub_technorep_7196

Ignjatović N, Nastasović A, Laninović V, Onjia A, Miljković M, Uskoković D. Physico-chemical properties of polymeric and composite bioresorbable barrier membranes. in Programme and the Book of Abstracts / The Fifth Yugoslav Materials Research Society Conference YUCOMAT 2003, Herceg Novi, September, 15-19, 2003. 2003;:51.
https://hdl.handle.net/21.15107/rcub_technorep_7196 .

Ignjatović, Nenad, Nastasović, Aleksandra, Laninović, Verica, Onjia, Antonije, Miljković, Milena, Uskoković, Dragan, "Physico-chemical properties of polymeric and composite bioresorbable barrier membranes" in Programme and the Book of Abstracts / The Fifth Yugoslav Materials Research Society Conference YUCOMAT 2003, Herceg Novi, September, 15-19, 2003 (2003):51,
https://hdl.handle.net/21.15107/rcub_technorep_7196 .

TY  - JOUR
AU  - Janaćković, Đorđe
AU  - Janković, Ivana A.
AU  - Petrović, R.
AU  - Kostić-Gvozdenović, Ljiljana
AU  - Milonjić, Slobodan K.
AU  - Uskoković, Dragan
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/507
AB  - In this paper surface properties of calcium-hydroxyapatite, synthesized by modified hydrothermal reaction of urea and Ca(EDTA)(2-) in phosphate solutions, as well as the dependence of calcium hydroxyapatite dispersion stability on pH were determined. The specific surface area of calcium-hydroxyapatite was experimentally found to be 67 m(2)/g. The point of zero charge (PZC) of indifferent KCl electrolyte of 6.8 +/- 0.1 was determined by the batch equilibration method. From the dependence of surface charge density on pH and electrolyte concentration, the intrinsic equilibrium constant of surface groups p K-a2(int) was determined to be 8.3 +/- 0.1, while p K-a1(int) calculated from the pK(a2)(int) and point of zero charge values, is 5.3 +/- 0.1. Hydroxyapatite suspension stability was investigated, in the pH range from 7 to 12, it was revealed that the most stable dispersion at pH 10.
PB  - Proceedings of the 15th International Symposium on Ceramics in Medicine; The Annual Meeting of the International Society for Ceramics in Medicine
T2  - Key Engineering Materials
T1  - Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates
EP  - 440
SP  - 437
VL  - 240-242
UR  - https://hdl.handle.net/21.15107/rcub_technorep_507
ER  - 

@article{
author = "Janaćković, Đorđe and Janković, Ivana A. and Petrović, R. and Kostić-Gvozdenović, Ljiljana and Milonjić, Slobodan K. and Uskoković, Dragan",
year = "2003",
abstract = "In this paper surface properties of calcium-hydroxyapatite, synthesized by modified hydrothermal reaction of urea and Ca(EDTA)(2-) in phosphate solutions, as well as the dependence of calcium hydroxyapatite dispersion stability on pH were determined. The specific surface area of calcium-hydroxyapatite was experimentally found to be 67 m(2)/g. The point of zero charge (PZC) of indifferent KCl electrolyte of 6.8 +/- 0.1 was determined by the batch equilibration method. From the dependence of surface charge density on pH and electrolyte concentration, the intrinsic equilibrium constant of surface groups p K-a2(int) was determined to be 8.3 +/- 0.1, while p K-a1(int) calculated from the pK(a2)(int) and point of zero charge values, is 5.3 +/- 0.1. Hydroxyapatite suspension stability was investigated, in the pH range from 7 to 12, it was revealed that the most stable dispersion at pH 10.",
publisher = "Proceedings of the 15th International Symposium on Ceramics in Medicine; The Annual Meeting of the International Society for Ceramics in Medicine",
journal = "Key Engineering Materials",
title = "Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates",
pages = "440-437",
volume = "240-242",
url = "https://hdl.handle.net/21.15107/rcub_technorep_507"
}

Janaćković, Đ., Janković, I. A., Petrović, R., Kostić-Gvozdenović, L., Milonjić, S. K.,& Uskoković, D.. (2003). Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates. in Key Engineering Materials
Proceedings of the 15th International Symposium on Ceramics in Medicine; The Annual Meeting of the International Society for Ceramics in Medicine., 240-242, 437-440.
https://hdl.handle.net/21.15107/rcub_technorep_507

Janaćković Đ, Janković IA, Petrović R, Kostić-Gvozdenović L, Milonjić SK, Uskoković D. Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates. in Key Engineering Materials. 2003;240-242:437-440.
https://hdl.handle.net/21.15107/rcub_technorep_507 .

Janaćković, Đorđe, Janković, Ivana A., Petrović, R., Kostić-Gvozdenović, Ljiljana, Milonjić, Slobodan K., Uskoković, Dragan, "Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates" in Key Engineering Materials, 240-242 (2003):437-440,
https://hdl.handle.net/21.15107/rcub_technorep_507 .

TY  - JOUR
AU  - Balać, Igor
AU  - Milovančević, Milorad
AU  - Uskoković, Petar
AU  - Tang, C. Y.
AU  - Uskoković, Dragan
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/588
AB  - The influence of particle geometry, volume fraction and particle distribution on the modulus of elasticity of a hydroxyapatite (HAp) particulate reinforced polymer (poly -L-lactide) matrix composite biomaterial was investigated through finite element (FE) analysis. Three various shapes and two types of particle distribution were considered. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the semi-empirical Halpin-Tsai method. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to volume fraction and particle distribution. Comparisons of available experimental data of the HAp/PLLA composites with the FE model results of spherical particles with face centered cubic (FCC) array, give very good agreement.
AB  - Na osnovu usvojenog numeričkog modela, primenom metode konačnih elemenata (MKE), analiziran je uticaj oblika, zapreminskog udela i rasporeda keramičkih čestica (HAp) u polimernoj matrici (PLLA) na modul elastičnosti kompozita. Razmatrana su tri oblika i dva rasporeda čestica u matrici. Izvršeno je poređenje tako dobijenih rezultata sa poluempirijskom metodom Halpin-Tsai i eksperimentalnim podacima. Rezultati istraživanja pokazuju da Jangov modul elastičnosti ne zavisi mnogo od oblika čestice. Sa druge strane, raspored čestica značajno utiče na modul elastičnosti (krutost) kompozita. Primećuje se da površinsko centrirani kubni (FCC) raspored čestica oblika sfere daje rezultate koji su najpribližniji eksperimentalnim podacima.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Bilten Instituta za nuklearne nauke Vinča
T1  - Calculation of elasticity modulus of particulate composite biomaterials using finite element method
T1  - Numeričko određivanje modula elastičnosti čestično kompozitnih biomaterijala primenom metode konačnih elemenata
EP  - 55
IS  - 1-4
SP  - 49
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_588
ER  - 

@article{
author = "Balać, Igor and Milovančević, Milorad and Uskoković, Petar and Tang, C. Y. and Uskoković, Dragan",
year = "2003",
abstract = "The influence of particle geometry, volume fraction and particle distribution on the modulus of elasticity of a hydroxyapatite (HAp) particulate reinforced polymer (poly -L-lactide) matrix composite biomaterial was investigated through finite element (FE) analysis. Three various shapes and two types of particle distribution were considered. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the semi-empirical Halpin-Tsai method. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to volume fraction and particle distribution. Comparisons of available experimental data of the HAp/PLLA composites with the FE model results of spherical particles with face centered cubic (FCC) array, give very good agreement., Na osnovu usvojenog numeričkog modela, primenom metode konačnih elemenata (MKE), analiziran je uticaj oblika, zapreminskog udela i rasporeda keramičkih čestica (HAp) u polimernoj matrici (PLLA) na modul elastičnosti kompozita. Razmatrana su tri oblika i dva rasporeda čestica u matrici. Izvršeno je poređenje tako dobijenih rezultata sa poluempirijskom metodom Halpin-Tsai i eksperimentalnim podacima. Rezultati istraživanja pokazuju da Jangov modul elastičnosti ne zavisi mnogo od oblika čestice. Sa druge strane, raspored čestica značajno utiče na modul elastičnosti (krutost) kompozita. Primećuje se da površinsko centrirani kubni (FCC) raspored čestica oblika sfere daje rezultate koji su najpribližniji eksperimentalnim podacima.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Bilten Instituta za nuklearne nauke Vinča",
title = "Calculation of elasticity modulus of particulate composite biomaterials using finite element method, Numeričko određivanje modula elastičnosti čestično kompozitnih biomaterijala primenom metode konačnih elemenata",
pages = "55-49",
number = "1-4",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_588"
}

Balać, I., Milovančević, M., Uskoković, P., Tang, C. Y.,& Uskoković, D.. (2003). Calculation of elasticity modulus of particulate composite biomaterials using finite element method. in Bilten Instituta za nuklearne nauke Vinča
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 8(1-4), 49-55.
https://hdl.handle.net/21.15107/rcub_technorep_588

Balać I, Milovančević M, Uskoković P, Tang CY, Uskoković D. Calculation of elasticity modulus of particulate composite biomaterials using finite element method. in Bilten Instituta za nuklearne nauke Vinča. 2003;8(1-4):49-55.
https://hdl.handle.net/21.15107/rcub_technorep_588 .

Balać, Igor, Milovančević, Milorad, Uskoković, Petar, Tang, C. Y., Uskoković, Dragan, "Calculation of elasticity modulus of particulate composite biomaterials using finite element method" in Bilten Instituta za nuklearne nauke Vinča, 8, no. 1-4 (2003):49-55,
https://hdl.handle.net/21.15107/rcub_technorep_588 .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Milovancević, M
AU  - Aleksić, Radoslav
AU  - Uskoković, Dragan
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/412
AB  - The influence of inclusion geometry and volume fraction on stiffness behavior of a particle hydroxyapatite filled polymer (poly-L-lactide and collagen) matrix composite was investigated by finite element. analysis. The compressive Young modulus was found to be slightly dependent on the particle shape, but very sensitive to the volume fraction of the filler particles. It was also shown that filler aspect, ratio, in the range of 1.0-2.5, had an impact on the maximal stress values, while the stiffness values were only barely influenced by the aspect ratio.
PB  - Proceedings of the fourth Yugoslav Materials Research Society Conference (YUCOMAT IV)
T2  - Materials Science Forum
T1  - Finite element modeling of mechanical properties of particulate composite biomaterials
EP  - 262
SP  - 257
VL  - 413
DO  - 10.4028/www.scientific.net/msf.413.257
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Milovancević, M and Aleksić, Radoslav and Uskoković, Dragan",
year = "2002",
abstract = "The influence of inclusion geometry and volume fraction on stiffness behavior of a particle hydroxyapatite filled polymer (poly-L-lactide and collagen) matrix composite was investigated by finite element. analysis. The compressive Young modulus was found to be slightly dependent on the particle shape, but very sensitive to the volume fraction of the filler particles. It was also shown that filler aspect, ratio, in the range of 1.0-2.5, had an impact on the maximal stress values, while the stiffness values were only barely influenced by the aspect ratio.",
publisher = "Proceedings of the fourth Yugoslav Materials Research Society Conference (YUCOMAT IV)",
journal = "Materials Science Forum",
title = "Finite element modeling of mechanical properties of particulate composite biomaterials",
pages = "262-257",
volume = "413",
doi = "10.4028/www.scientific.net/msf.413.257"
}

Balać, I., Uskoković, P., Milovancević, M., Aleksić, R.,& Uskoković, D.. (2002). Finite element modeling of mechanical properties of particulate composite biomaterials. in Materials Science Forum
Proceedings of the fourth Yugoslav Materials Research Society Conference (YUCOMAT IV)., 413, 257-262.
https://doi.org/10.4028/www.scientific.net/msf.413.257

Balać I, Uskoković P, Milovancević M, Aleksić R, Uskoković D. Finite element modeling of mechanical properties of particulate composite biomaterials. in Materials Science Forum. 2002;413:257-262.
doi:10.4028/www.scientific.net/msf.413.257 .

Balać, Igor, Uskoković, Petar, Milovancević, M, Aleksić, Radoslav, Uskoković, Dragan, "Finite element modeling of mechanical properties of particulate composite biomaterials" in Materials Science Forum, 413 (2002):257-262,
https://doi.org/10.4028/www.scientific.net/msf.413.257 . .

TY  - JOUR
AU  - Balać, Igor
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
AU  - Uskoković, Dragan
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/427
AB  - The influence of particle geometry and volume fraction on the mechanical properties of a hydroxyapatite (HAp) particulate reinforced polymer (poly-L-lactide and collagen) matrix composite was investigated through finite-element (FE) analysis. For cube-shaped (near sharp and curved corners and edges) embedded particles, it was found that the maximum stress concentration factor (SCF) in the matrix decreases with an increase of the HAp particle volume fraction (PVF). The maximum stress concentration in the matrix material containing a spherical inclusion has low sensitivity to the PVF. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to PVF. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the Halpin-Tsai model.
PB  - Wiley, Hoboken
T2  - Journal of Biomedical Materials Research
T1  - Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites
EP  - 799
IS  - 6
SP  - 793
VL  - 63
DO  - 10.1002/jbm.10407
ER  - 

@article{
author = "Balać, Igor and Uskoković, Petar and Aleksić, Radoslav and Uskoković, Dragan",
year = "2002",
abstract = "The influence of particle geometry and volume fraction on the mechanical properties of a hydroxyapatite (HAp) particulate reinforced polymer (poly-L-lactide and collagen) matrix composite was investigated through finite-element (FE) analysis. For cube-shaped (near sharp and curved corners and edges) embedded particles, it was found that the maximum stress concentration factor (SCF) in the matrix decreases with an increase of the HAp particle volume fraction (PVF). The maximum stress concentration in the matrix material containing a spherical inclusion has low sensitivity to the PVF. The compressive Young's modulus was found to be slightly dependent on particle shape, but very sensitive to PVF. Calculated stiffness values from FE analysis were compared to the experimental results available in the literature and with predictions from the Halpin-Tsai model.",
publisher = "Wiley, Hoboken",
journal = "Journal of Biomedical Materials Research",
title = "Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites",
pages = "799-793",
number = "6",
volume = "63",
doi = "10.1002/jbm.10407"
}

Balać, I., Uskoković, P., Aleksić, R.,& Uskoković, D.. (2002). Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites. in Journal of Biomedical Materials Research
Wiley, Hoboken., 63(6), 793-799.
https://doi.org/10.1002/jbm.10407

Balać I, Uskoković P, Aleksić R, Uskoković D. Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites. in Journal of Biomedical Materials Research. 2002;63(6):793-799.
doi:10.1002/jbm.10407 .

Balać, Igor, Uskoković, Petar, Aleksić, Radoslav, Uskoković, Dragan, "Predictive modeling of the mechanical properties of particulate hydroxyapatite reinforced polymer composites" in Journal of Biomedical Materials Research, 63, no. 6 (2002):793-799,
https://doi.org/10.1002/jbm.10407 . .