TY  - JOUR
AU  - Kovač, Tijana
AU  - Džunuzović, Enis
AU  - Džunuzović, Jasna
AU  - Milićević, Bojana R.
AU  - Sredojević, Dušan
AU  - Brothers, Edward N.
AU  - Nedeljković, Jovan
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3865
AB  - Surface modification of titanium dioxide nanoparticles (TiO2 NPs) with the biologically active molecule pyridoxine hydrochloride (vitamin B-6) was found to alter the optical properties. Microstructural characterization involving transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis revealed that the anatase TiO2 NPs had a narrow size distribution with an average diameter of 45 angstrom. The absorption onset of the surface-modified TiO2 samples was red-shifted by about 0.4 eV compared to the unmodified particles. The mode of binding between vitamin B-6 and the surface Ti atoms was investigated by Fourier transform infrared spectroscopy (FTIR). From the Benesi-Hildebrand plot, the stability constant of the surface complex was found to be of the order 10(2) M-1. The experimental findings were supported by detailed quantum chemical calculations based on the density functional theory (DFT). Agreement was found between the experimentally measured absorption spectra of the TiO2 NPs surface-modified with vitamin B-6 and the theoretically calculated electronic excitation spectra of the corresponding model system.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Visible light absorption of TiO2 nanoparticles surface-modified with vitamin B-6: A comparative experimental and DFT study
EP  - 909
IS  - 7-8
SP  - 899
VL  - 83
DO  - 10.2298/JSC180131044K
ER  - 

@article{
author = "Kovač, Tijana and Džunuzović, Enis and Džunuzović, Jasna and Milićević, Bojana R. and Sredojević, Dušan and Brothers, Edward N. and Nedeljković, Jovan",
year = "2018",
abstract = "Surface modification of titanium dioxide nanoparticles (TiO2 NPs) with the biologically active molecule pyridoxine hydrochloride (vitamin B-6) was found to alter the optical properties. Microstructural characterization involving transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis revealed that the anatase TiO2 NPs had a narrow size distribution with an average diameter of 45 angstrom. The absorption onset of the surface-modified TiO2 samples was red-shifted by about 0.4 eV compared to the unmodified particles. The mode of binding between vitamin B-6 and the surface Ti atoms was investigated by Fourier transform infrared spectroscopy (FTIR). From the Benesi-Hildebrand plot, the stability constant of the surface complex was found to be of the order 10(2) M-1. The experimental findings were supported by detailed quantum chemical calculations based on the density functional theory (DFT). Agreement was found between the experimentally measured absorption spectra of the TiO2 NPs surface-modified with vitamin B-6 and the theoretically calculated electronic excitation spectra of the corresponding model system.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Visible light absorption of TiO2 nanoparticles surface-modified with vitamin B-6: A comparative experimental and DFT study",
pages = "909-899",
number = "7-8",
volume = "83",
doi = "10.2298/JSC180131044K"
}

Kovač, T., Džunuzović, E., Džunuzović, J., Milićević, B. R., Sredojević, D., Brothers, E. N.,& Nedeljković, J.. (2018). Visible light absorption of TiO2 nanoparticles surface-modified with vitamin B-6: A comparative experimental and DFT study. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 83(7-8), 899-909.
https://doi.org/10.2298/JSC180131044K

Kovač T, Džunuzović E, Džunuzović J, Milićević BR, Sredojević D, Brothers EN, Nedeljković J. Visible light absorption of TiO2 nanoparticles surface-modified with vitamin B-6: A comparative experimental and DFT study. in Journal of the Serbian Chemical Society. 2018;83(7-8):899-909.
doi:10.2298/JSC180131044K .

Kovač, Tijana, Džunuzović, Enis, Džunuzović, Jasna, Milićević, Bojana R., Sredojević, Dušan, Brothers, Edward N., Nedeljković, Jovan, "Visible light absorption of TiO2 nanoparticles surface-modified with vitamin B-6: A comparative experimental and DFT study" in Journal of the Serbian Chemical Society, 83, no. 7-8 (2018):899-909,
https://doi.org/10.2298/JSC180131044K . .

TY  - JOUR
AU  - Krsmanović, Radenka
AU  - Antić, Željka
AU  - Milićević, Bojana R.
AU  - Pošarac-Marković, Milica B.
AU  - Janaćković, Đorđe
AU  - Dramićanin, Miroslav
AU  - Brik, Mikhail G.
AU  - Steins, Ints
AU  - Veljović, Đorđe
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2857
AB  - Using Spark Plasma Sintering it is possible to produce polycrystalline ceramics of very fine microstructure and good mechanical properties. This work presents the fabrication of such ceramics using Eu3+-doped (Y0.7Gd0.3)(2)O-3 nanopowder as a starting material. We monitored the changes in the morphology of ceramic samples and their consolidation with additional thermal treatments at 650 degrees C and 1100 degrees C. The ceramics grain size remained in the sub-micron domain, even when elevated temperatures were used for annealing. The best results were obtained for the sample sintered at 1100 degrees C for 20 min, which had the smallest grain size, theoretical density, and the most intensive photoluminescence, along with the maximum hardness and appropriate fracture toughness. The Judd-Ofelt intensity parameters and branching ratios were calculated, taking into account the difference in the effective refractive index for the nanopowder and ceramic samples.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Polycrystalline (Y0.7Gd0.3)(2)O-3:Eu3+ ceramics fabricated by Spark Plasma Sintering: Densification and microstructure development
EP  - 8862
IS  - 6
SP  - 8853
VL  - 40
DO  - 10.1016/j.ceramint.2014.01.108
ER  - 

@article{
author = "Krsmanović, Radenka and Antić, Željka and Milićević, Bojana R. and Pošarac-Marković, Milica B. and Janaćković, Đorđe and Dramićanin, Miroslav and Brik, Mikhail G. and Steins, Ints and Veljović, Đorđe",
year = "2014",
abstract = "Using Spark Plasma Sintering it is possible to produce polycrystalline ceramics of very fine microstructure and good mechanical properties. This work presents the fabrication of such ceramics using Eu3+-doped (Y0.7Gd0.3)(2)O-3 nanopowder as a starting material. We monitored the changes in the morphology of ceramic samples and their consolidation with additional thermal treatments at 650 degrees C and 1100 degrees C. The ceramics grain size remained in the sub-micron domain, even when elevated temperatures were used for annealing. The best results were obtained for the sample sintered at 1100 degrees C for 20 min, which had the smallest grain size, theoretical density, and the most intensive photoluminescence, along with the maximum hardness and appropriate fracture toughness. The Judd-Ofelt intensity parameters and branching ratios were calculated, taking into account the difference in the effective refractive index for the nanopowder and ceramic samples.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Polycrystalline (Y0.7Gd0.3)(2)O-3:Eu3+ ceramics fabricated by Spark Plasma Sintering: Densification and microstructure development",
pages = "8862-8853",
number = "6",
volume = "40",
doi = "10.1016/j.ceramint.2014.01.108"
}

Krsmanović, R., Antić, Ž., Milićević, B. R., Pošarac-Marković, M. B., Janaćković, Đ., Dramićanin, M., Brik, M. G., Steins, I.,& Veljović, Đ.. (2014). Polycrystalline (Y0.7Gd0.3)(2)O-3:Eu3+ ceramics fabricated by Spark Plasma Sintering: Densification and microstructure development. in Ceramics International
Elsevier Sci Ltd, Oxford., 40(6), 8853-8862.
https://doi.org/10.1016/j.ceramint.2014.01.108

Krsmanović R, Antić Ž, Milićević BR, Pošarac-Marković MB, Janaćković Đ, Dramićanin M, Brik MG, Steins I, Veljović Đ. Polycrystalline (Y0.7Gd0.3)(2)O-3:Eu3+ ceramics fabricated by Spark Plasma Sintering: Densification and microstructure development. in Ceramics International. 2014;40(6):8853-8862.
doi:10.1016/j.ceramint.2014.01.108 .

Krsmanović, Radenka, Antić, Željka, Milićević, Bojana R., Pošarac-Marković, Milica B., Janaćković, Đorđe, Dramićanin, Miroslav, Brik, Mikhail G., Steins, Ints, Veljović, Đorđe, "Polycrystalline (Y0.7Gd0.3)(2)O-3:Eu3+ ceramics fabricated by Spark Plasma Sintering: Densification and microstructure development" in Ceramics International, 40, no. 6 (2014):8853-8862,
https://doi.org/10.1016/j.ceramint.2014.01.108 . .