TY  - JOUR
AU  - Aleksić, Katarina
AU  - Stojković Simatović, Ivana
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Radmilović, Nadežda
AU  - Rajić, Vladimir
AU  - Škapin, Srečo Davor
AU  - Mančić, Lidija
AU  - Marković, Smilja
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11080
AB  - Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.
T2  - Frontiers in Chemistry
T1  - Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting
VL  - 11
DO  - 10.3389/fchem.2023.1173910
ER  - 

@article{
author = "Aleksić, Katarina and Stojković Simatović, Ivana and Stanković, Ana and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Radmilović, Nadežda and Rajić, Vladimir and Škapin, Srečo Davor and Mančić, Lidija and Marković, Smilja",
year = "2023",
abstract = "Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.",
journal = "Frontiers in Chemistry",
title = "Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting",
volume = "11",
doi = "10.3389/fchem.2023.1173910"
}

Aleksić, K., Stojković Simatović, I., Stanković, A., Veselinović, L., Stojadinović, S., Rac, V., Radmilović, N., Rajić, V., Škapin, S. D., Mančić, L.,& Marković, S.. (2023). Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting. in Frontiers in Chemistry, 11.
https://doi.org/10.3389/fchem.2023.1173910

Aleksić K, Stojković Simatović I, Stanković A, Veselinović L, Stojadinović S, Rac V, Radmilović N, Rajić V, Škapin SD, Mančić L, Marković S. Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting. in Frontiers in Chemistry. 2023;11.
doi:10.3389/fchem.2023.1173910 .

Aleksić, Katarina, Stojković Simatović, Ivana, Stanković, Ana, Veselinović, Ljiljana, Stojadinović, Stevan, Rac, Vladislav, Radmilović, Nadežda, Rajić, Vladimir, Škapin, Srečo Davor, Mančić, Lidija, Marković, Smilja, "Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting" in Frontiers in Chemistry, 11 (2023),
https://doi.org/10.3389/fchem.2023.1173910 . .

TY  - CONF
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Dinić, Ivana
AU  - Vuković, Marina
AU  - Barudžija, Tanja
AU  - Čebela, Maria
AU  - Lojpur, Vesna
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11483
AB  - In this investigation, samples of SrGd2O4 doped with different Yb3+ (2, 4, 6 at.%) ions and constant Ho3+ (1 at.%) and Bi3+ (2 at.%) concentrations were prepared. The sol-gel method with glycine as a fuel and citric acid as a chelator was chosen for sample preparation. All samples were heated in the furnace for 1.5 h at 500 °C and then thermally treated for 2.5 h at 1000 °C. The pure orthorhombic lattice of SrGd2O4, space group Pnma, was revealed by X-ray diffraction (XRD) (JCPDS Card No.:01-072-6387). Transmission electron microscopy (TEM) discovered agglomerated clusters of spherical particles measuring around 150 nm in size. Including Bi3+ ions into the structure influenced the morphology of the sample showing fine packing of pyramidal-shaped nanoparticles. The uniform distribution of constitutive elements in the samples was confirmed by energy dispersive spectroscopy (EDS). Up-conversion emission properties were evaluated from photoluminescent emission spectra and intensity dependence on excitation power after excitation at 976 nm. Dominant green (550 nm), red (671 nm), and infrared (758 nm) 5F4, 5S2 → 5I8, 5F5 → 5I8, 5F4, 5S2 → 5I7 transition emissions, respectively, are detected in all samples. The sample co-doped with Bi3+ showed the most intense photoluminescent emission.
PB  - Belgrade : Institute for Multidisciplinary Research
C3  - Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia
T1  - Enhancement of up-conversion luminescent characteristics of Yb3+/Ho3+ co-doped Bi3+ based SrGd2O4 nanoparticles
SP  - 113
EP  - 114
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11483
ER  - 

@conference{
author = "Stamenković, Tijana and Radmilović, Nadežda and Dinić, Ivana and Vuković, Marina and Barudžija, Tanja and Čebela, Maria and Lojpur, Vesna",
year = "2023",
abstract = "In this investigation, samples of SrGd2O4 doped with different Yb3+ (2, 4, 6 at.%) ions and constant Ho3+ (1 at.%) and Bi3+ (2 at.%) concentrations were prepared. The sol-gel method with glycine as a fuel and citric acid as a chelator was chosen for sample preparation. All samples were heated in the furnace for 1.5 h at 500 °C and then thermally treated for 2.5 h at 1000 °C. The pure orthorhombic lattice of SrGd2O4, space group Pnma, was revealed by X-ray diffraction (XRD) (JCPDS Card No.:01-072-6387). Transmission electron microscopy (TEM) discovered agglomerated clusters of spherical particles measuring around 150 nm in size. Including Bi3+ ions into the structure influenced the morphology of the sample showing fine packing of pyramidal-shaped nanoparticles. The uniform distribution of constitutive elements in the samples was confirmed by energy dispersive spectroscopy (EDS). Up-conversion emission properties were evaluated from photoluminescent emission spectra and intensity dependence on excitation power after excitation at 976 nm. Dominant green (550 nm), red (671 nm), and infrared (758 nm) 5F4, 5S2 → 5I8, 5F5 → 5I8, 5F4, 5S2 → 5I7 transition emissions, respectively, are detected in all samples. The sample co-doped with Bi3+ showed the most intense photoluminescent emission.",
publisher = "Belgrade : Institute for Multidisciplinary Research",
journal = "Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia",
title = "Enhancement of up-conversion luminescent characteristics of Yb3+/Ho3+ co-doped Bi3+ based SrGd2O4 nanoparticles",
pages = "113-114",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11483"
}

Stamenković, T., Radmilović, N., Dinić, I., Vuković, M., Barudžija, T., Čebela, M.,& Lojpur, V.. (2023). Enhancement of up-conversion luminescent characteristics of Yb3+/Ho3+ co-doped Bi3+ based SrGd2O4 nanoparticles. in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia
Belgrade : Institute for Multidisciplinary Research., 113-114.
https://hdl.handle.net/21.15107/rcub_vinar_11483

Stamenković T, Radmilović N, Dinić I, Vuković M, Barudžija T, Čebela M, Lojpur V. Enhancement of up-conversion luminescent characteristics of Yb3+/Ho3+ co-doped Bi3+ based SrGd2O4 nanoparticles. in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia. 2023;:113-114.
https://hdl.handle.net/21.15107/rcub_vinar_11483 .

Stamenković, Tijana, Radmilović, Nadežda, Dinić, Ivana, Vuković, Marina, Barudžija, Tanja, Čebela, Maria, Lojpur, Vesna, "Enhancement of up-conversion luminescent characteristics of Yb3+/Ho3+ co-doped Bi3+ based SrGd2O4 nanoparticles" in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia (2023):113-114,
https://hdl.handle.net/21.15107/rcub_vinar_11483 .

TY  - JOUR
AU  - Stamenković, Tijana
AU  - Dinić, Ivana
AU  - Vuković, Marina
AU  - Radmilović, Nadežda
AU  - Barudžija, Tanja
AU  - Tomić, Miloš
AU  - Mančić, Lidija
AU  - Lojpur, Vesna
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11579
AB  - In this investigation, samples of strontium-gadolinium-oxide (SrGd2O4) doped with different Yb3+ (2, 4 and 6 at%) and constant Ho3+ (1 at%) contents and co-doped with Bi3+ (2 at%) were prepared using the glycine-assisted sol–gel method. The pure orthorhombic SrGd2O4 phase, space group Pnma, was revealed using X-ray diffraction in all samples. Transmission electron microscopy discovered agglomerated clusters of spherical particles measuring approximately 150 nm in size. The inclusion of Bi3+ ions into the structure influenced the morphology since the formation of larger grains was observed, with sizes reaching up to ∼1.7 μm. The uniform distribution of all constitutive elements was confirmed by energy-dispersive X-ray spectroscopy. In all samples, up-conversion emission spectra revealed two dominant green (540 and 550 nm), red (671 nm), and infrared (758 nm) emission lines, due to the 5F4,5S2→5I8, 5F5→5I8, and 5F4,5S2 → 5I7 transitions, respectively. The sample co-doped with Bi3+ showed the most intense photoluminescent emissions, shorter luminescence decay, and the highest quantum yield. Additionally, a significant decrease in the energy band gap value was detected using diffuse reflectance spectroscopy for this sample. Methylene blue was used as a test pollutant to investigate its photocatalytic efficiency under simulated sunlight irradiation. The results show that Bi3+ co-doping deteriorates the photocatalytic efficiency of the SrGd2O4:Yb3+/Ho3+ phase by reducing hydroxyl radical formation.
T2  - Ceramics International
T1  - Effect of Bi3+co-doping on the up-converting and photocatalytic properties of SrGd2O4:Yb3+/Ho3+ phase
DO  - 10.1016/j.ceramint.2023.09.103
ER  - 

@article{
author = "Stamenković, Tijana and Dinić, Ivana and Vuković, Marina and Radmilović, Nadežda and Barudžija, Tanja and Tomić, Miloš and Mančić, Lidija and Lojpur, Vesna",
year = "2023",
abstract = "In this investigation, samples of strontium-gadolinium-oxide (SrGd2O4) doped with different Yb3+ (2, 4 and 6 at%) and constant Ho3+ (1 at%) contents and co-doped with Bi3+ (2 at%) were prepared using the glycine-assisted sol–gel method. The pure orthorhombic SrGd2O4 phase, space group Pnma, was revealed using X-ray diffraction in all samples. Transmission electron microscopy discovered agglomerated clusters of spherical particles measuring approximately 150 nm in size. The inclusion of Bi3+ ions into the structure influenced the morphology since the formation of larger grains was observed, with sizes reaching up to ∼1.7 μm. The uniform distribution of all constitutive elements was confirmed by energy-dispersive X-ray spectroscopy. In all samples, up-conversion emission spectra revealed two dominant green (540 and 550 nm), red (671 nm), and infrared (758 nm) emission lines, due to the 5F4,5S2→5I8, 5F5→5I8, and 5F4,5S2 → 5I7 transitions, respectively. The sample co-doped with Bi3+ showed the most intense photoluminescent emissions, shorter luminescence decay, and the highest quantum yield. Additionally, a significant decrease in the energy band gap value was detected using diffuse reflectance spectroscopy for this sample. Methylene blue was used as a test pollutant to investigate its photocatalytic efficiency under simulated sunlight irradiation. The results show that Bi3+ co-doping deteriorates the photocatalytic efficiency of the SrGd2O4:Yb3+/Ho3+ phase by reducing hydroxyl radical formation.",
journal = "Ceramics International",
title = "Effect of Bi3+co-doping on the up-converting and photocatalytic properties of SrGd2O4:Yb3+/Ho3+ phase",
doi = "10.1016/j.ceramint.2023.09.103"
}

Stamenković, T., Dinić, I., Vuković, M., Radmilović, N., Barudžija, T., Tomić, M., Mančić, L.,& Lojpur, V.. (2023). Effect of Bi3+co-doping on the up-converting and photocatalytic properties of SrGd2O4:Yb3+/Ho3+ phase. in Ceramics International.
https://doi.org/10.1016/j.ceramint.2023.09.103

Stamenković T, Dinić I, Vuković M, Radmilović N, Barudžija T, Tomić M, Mančić L, Lojpur V. Effect of Bi3+co-doping on the up-converting and photocatalytic properties of SrGd2O4:Yb3+/Ho3+ phase. in Ceramics International. 2023;.
doi:10.1016/j.ceramint.2023.09.103 .

Stamenković, Tijana, Dinić, Ivana, Vuković, Marina, Radmilović, Nadežda, Barudžija, Tanja, Tomić, Miloš, Mančić, Lidija, Lojpur, Vesna, "Effect of Bi3+co-doping on the up-converting and photocatalytic properties of SrGd2O4:Yb3+/Ho3+ phase" in Ceramics International (2023),
https://doi.org/10.1016/j.ceramint.2023.09.103 . .

TY  - JOUR
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Prekajski-Đorđević, Marija D.
AU  - Rabasović, Mihailo
AU  - Dinić, Ivana
AU  - Tomić, Miloš
AU  - Lojpur, Vesna
AU  - Mančić, Lidija
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10499
AB  - Nanopowders of up-conversion SrGd2O4 orthorhombic (Pnma) phase co-doped with different Yb3+ (1, 2.5 and 5 at%) and constant Er3+ (0.5 at%) ions were successfully prepared via sol-gel assisted combustion. Rietveld refinement indicated unit cell lattice parameters increase with Yb3+ and Er3+ ions doping. Scanning transmission electron microscopy with corresponding energy-dispersive X-ray spectroscopy revealed that obtained powders are composed of agglomerated nanoparticles that have a uniform distribution of all constituting elements. Photoluminescence measurements implied intensification of the up-conversion (UC) emission in the visible part of spectrum with the increase of Yb3+ content, which is followed by a significant change in the green to red ratio. Two-photon UC processes are established as a result of Er3+ f-f electronic transitions: green emission at 523 and 551 nm (2H11/2, 4S3/2 → 4I15/2) as well as a red emission at 661 nm (4F9/2 → 4I15/2). The highest value of absolute quantum yield of 0.055% is determined for SrGd2O4 nanoparticles doped with 0.5 at% of Er3+ and co-doped with 5 at% of Yb3+ (λexc = 976 nm, power density 200 W/cm2).
T2  - Journal of Luminescence
T1  - Quantum yield and energy transfer in up-conversion SrGd2O4:Yb, Er nanoparticles obtained via sol-gel assisted combustion
VL  - 253
SP  - 119491
DO  - 10.1016/j.jlumin.2022.119491
ER  - 

@article{
author = "Stamenković, Tijana and Radmilović, Nadežda and Prekajski-Đorđević, Marija D. and Rabasović, Mihailo and Dinić, Ivana and Tomić, Miloš and Lojpur, Vesna and Mančić, Lidija",
year = "2023",
abstract = "Nanopowders of up-conversion SrGd2O4 orthorhombic (Pnma) phase co-doped with different Yb3+ (1, 2.5 and 5 at%) and constant Er3+ (0.5 at%) ions were successfully prepared via sol-gel assisted combustion. Rietveld refinement indicated unit cell lattice parameters increase with Yb3+ and Er3+ ions doping. Scanning transmission electron microscopy with corresponding energy-dispersive X-ray spectroscopy revealed that obtained powders are composed of agglomerated nanoparticles that have a uniform distribution of all constituting elements. Photoluminescence measurements implied intensification of the up-conversion (UC) emission in the visible part of spectrum with the increase of Yb3+ content, which is followed by a significant change in the green to red ratio. Two-photon UC processes are established as a result of Er3+ f-f electronic transitions: green emission at 523 and 551 nm (2H11/2, 4S3/2 → 4I15/2) as well as a red emission at 661 nm (4F9/2 → 4I15/2). The highest value of absolute quantum yield of 0.055% is determined for SrGd2O4 nanoparticles doped with 0.5 at% of Er3+ and co-doped with 5 at% of Yb3+ (λexc = 976 nm, power density 200 W/cm2).",
journal = "Journal of Luminescence",
title = "Quantum yield and energy transfer in up-conversion SrGd2O4:Yb, Er nanoparticles obtained via sol-gel assisted combustion",
volume = "253",
pages = "119491",
doi = "10.1016/j.jlumin.2022.119491"
}

Stamenković, T., Radmilović, N., Prekajski-Đorđević, M. D., Rabasović, M., Dinić, I., Tomić, M., Lojpur, V.,& Mančić, L.. (2023). Quantum yield and energy transfer in up-conversion SrGd2O4:Yb, Er nanoparticles obtained via sol-gel assisted combustion. in Journal of Luminescence, 253, 119491.
https://doi.org/10.1016/j.jlumin.2022.119491

Stamenković T, Radmilović N, Prekajski-Đorđević MD, Rabasović M, Dinić I, Tomić M, Lojpur V, Mančić L. Quantum yield and energy transfer in up-conversion SrGd2O4:Yb, Er nanoparticles obtained via sol-gel assisted combustion. in Journal of Luminescence. 2023;253:119491.
doi:10.1016/j.jlumin.2022.119491 .

Stamenković, Tijana, Radmilović, Nadežda, Prekajski-Đorđević, Marija D., Rabasović, Mihailo, Dinić, Ivana, Tomić, Miloš, Lojpur, Vesna, Mančić, Lidija, "Quantum yield and energy transfer in up-conversion SrGd2O4:Yb, Er nanoparticles obtained via sol-gel assisted combustion" in Journal of Luminescence, 253 (2023):119491,
https://doi.org/10.1016/j.jlumin.2022.119491 . .

TY  - CONF
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Čebela, Maria
AU  - Prekajski Đorđević, Marija
AU  - Lojpur, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12859
AB  - Nanopowders of a new up-conversion materials, SrGd 2 O4 co-doped with different Yb3+ (1, 2.5 and 5 at%) and constant Er 3+ (0.5 at%) concentrations were prepared by combustion method. X-ray powder diffraction (XRPD) showed that nanoparticles have orthorhombic structure (Pnma), assigned to the JCPDS Card No:01-072-6387. Rietveld refinement indicated a decrease in the size of the unit cell, lattice parameters, and cell volume, due to successful doping of Yb3+ and Er 3+ ions into the host structure. Transmission electron microscopy (TEM) revealed that obtained nanostructure is composed of agglomerated nanoparticles, while energy dispersive spectroscopy (EDS) confirmed uniform distribution of all constituting elements in them. Up-conversion (UC) luminescence spectra measured in function of laser pumping power indicated that two-photon UC process is established in nanoparticles as a result of the trivalent erbium f-f electronic transitions: two green emission bands at 523 and 551 nm ( 2 H11/2 , 4 S 3/2 → 4 I 15/2) as well as a red emission band at 661 nm ( 4 F9/2 → 4 I 15/2). The rise of Yb3+ concentration from 1 to 5 at% provokes a significant change of the green to red ratio showing the ability to fine-tuning the color output.
PB  - Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade
PB  - Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)
C3  - Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022
T1  - Investigation of Yb3+/Er3+ doped SrGd2O4 up-conversion nanomaterial obtained via combustion synthesis
SP  - 50
EP  - 50
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12859
ER  - 

@conference{
author = "Stamenković, Tijana and Radmilović, Nadežda and Čebela, Maria and Prekajski Đorđević, Marija and Lojpur, Vesna",
year = "2022",
abstract = "Nanopowders of a new up-conversion materials, SrGd 2 O4 co-doped with different Yb3+ (1, 2.5 and 5 at%) and constant Er 3+ (0.5 at%) concentrations were prepared by combustion method. X-ray powder diffraction (XRPD) showed that nanoparticles have orthorhombic structure (Pnma), assigned to the JCPDS Card No:01-072-6387. Rietveld refinement indicated a decrease in the size of the unit cell, lattice parameters, and cell volume, due to successful doping of Yb3+ and Er 3+ ions into the host structure. Transmission electron microscopy (TEM) revealed that obtained nanostructure is composed of agglomerated nanoparticles, while energy dispersive spectroscopy (EDS) confirmed uniform distribution of all constituting elements in them. Up-conversion (UC) luminescence spectra measured in function of laser pumping power indicated that two-photon UC process is established in nanoparticles as a result of the trivalent erbium f-f electronic transitions: two green emission bands at 523 and 551 nm ( 2 H11/2 , 4 S 3/2 → 4 I 15/2) as well as a red emission band at 661 nm ( 4 F9/2 → 4 I 15/2). The rise of Yb3+ concentration from 1 to 5 at% provokes a significant change of the green to red ratio showing the ability to fine-tuning the color output.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade, Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)",
journal = "Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022",
title = "Investigation of Yb3+/Er3+ doped SrGd2O4 up-conversion nanomaterial obtained via combustion synthesis",
pages = "50-50",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12859"
}

Stamenković, T., Radmilović, N., Čebela, M., Prekajski Đorđević, M.,& Lojpur, V.. (2022). Investigation of Yb3+/Er3+ doped SrGd2O4 up-conversion nanomaterial obtained via combustion synthesis. in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022
Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade., 50-50.
https://hdl.handle.net/21.15107/rcub_vinar_12859

Stamenković T, Radmilović N, Čebela M, Prekajski Đorđević M, Lojpur V. Investigation of Yb3+/Er3+ doped SrGd2O4 up-conversion nanomaterial obtained via combustion synthesis. in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022. 2022;:50-50.
https://hdl.handle.net/21.15107/rcub_vinar_12859 .

Stamenković, Tijana, Radmilović, Nadežda, Čebela, Maria, Prekajski Đorđević, Marija, Lojpur, Vesna, "Investigation of Yb3+/Er3+ doped SrGd2O4 up-conversion nanomaterial obtained via combustion synthesis" in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022 (2022):50-50,
https://hdl.handle.net/21.15107/rcub_vinar_12859 .

TY  - CONF
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Erčić, Jelena
AU  - Čebela, Maria
AU  - Lojpur, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12860
AB  - In this investigation, down-conversion nanopowders of SrGd 2 O 4 doped with different concentrations of either Dy3+ or Sm3+ ions were examined. All samples were prepared via glycine-assisted combustion method, first burned at 500 ºC for 1.5h and additionally calcined at 1000 ºC for 2.5h, at ambient room temperature. The XRD analysis confirmed that all samples crystallize as single phase and the orthorhombic lattice SrGd2O4 . TEM analysis determined high degree of crystallinity of samples with grain size of approximately 200 nm for Dy 3+ doped and 150 nm for Sm 3+ doped SrGd2 O 4 . For both samples SAED showed that diffraction rings correspond to the hkl plane indices of SrGd 2 O 4 , while EDS indicated presence of Dy in crystal structure. Results of luminescent characterization demonstrated all appropriate emission peaks related to either Dy3+ or Sm 3+ dopant ions. Investigation of dopant concentration revealed that the lowest values of both dopants have the most prominent emission peaks, while coordinates obtained from the CIE diagram showed emission shifting with the change of concentration.
PB  - Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade
PB  - Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)
C3  - Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022
T1  - Synthesis and characterization of a new Dy3+ and Sm3+ doped SrGd2O4 down-conversion    nanomaterial obtained via glycine-assisted combustion synthesis
SP  - 51
EP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12860
ER  - 

@conference{
author = "Stamenković, Tijana and Radmilović, Nadežda and Erčić, Jelena and Čebela, Maria and Lojpur, Vesna",
year = "2022",
abstract = "In this investigation, down-conversion nanopowders of SrGd 2 O 4 doped with different concentrations of either Dy3+ or Sm3+ ions were examined. All samples were prepared via glycine-assisted combustion method, first burned at 500 ºC for 1.5h and additionally calcined at 1000 ºC for 2.5h, at ambient room temperature. The XRD analysis confirmed that all samples crystallize as single phase and the orthorhombic lattice SrGd2O4 . TEM analysis determined high degree of crystallinity of samples with grain size of approximately 200 nm for Dy 3+ doped and 150 nm for Sm 3+ doped SrGd2 O 4 . For both samples SAED showed that diffraction rings correspond to the hkl plane indices of SrGd 2 O 4 , while EDS indicated presence of Dy in crystal structure. Results of luminescent characterization demonstrated all appropriate emission peaks related to either Dy3+ or Sm 3+ dopant ions. Investigation of dopant concentration revealed that the lowest values of both dopants have the most prominent emission peaks, while coordinates obtained from the CIE diagram showed emission shifting with the change of concentration.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade, Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)",
journal = "Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022",
title = "Synthesis and characterization of a new Dy3+ and Sm3+ doped SrGd2O4 down-conversion    nanomaterial obtained via glycine-assisted combustion synthesis",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12860"
}

Stamenković, T., Radmilović, N., Erčić, J., Čebela, M.,& Lojpur, V.. (2022). Synthesis and characterization of a new Dy3+ and Sm3+ doped SrGd2O4 down-conversion    nanomaterial obtained via glycine-assisted combustion synthesis. in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022
Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade., 51-51.
https://hdl.handle.net/21.15107/rcub_vinar_12860

Stamenković T, Radmilović N, Erčić J, Čebela M, Lojpur V. Synthesis and characterization of a new Dy3+ and Sm3+ doped SrGd2O4 down-conversion    nanomaterial obtained via glycine-assisted combustion synthesis. in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022. 2022;:51-51.
https://hdl.handle.net/21.15107/rcub_vinar_12860 .

Stamenković, Tijana, Radmilović, Nadežda, Erčić, Jelena, Čebela, Maria, Lojpur, Vesna, "Synthesis and characterization of a new Dy3+ and Sm3+ doped SrGd2O4 down-conversion    nanomaterial obtained via glycine-assisted combustion synthesis" in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022 (2022):51-51,
https://hdl.handle.net/21.15107/rcub_vinar_12860 .

TY  - JOUR
AU  - Lojpur, Vesna
AU  - Joschko, Maximilian
AU  - Graf, Christina
AU  - Radmilović, Nadežda
AU  - Novaković, Mirjana M.
AU  - Validžić, Ivana Lj.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9955
AB  - Amorphous non-doped, iodine- and tin-doped Sb2S3 nanoparticles were prepared via the hot-injection method. HRTEM of amorphous undoped and doped samples revealed the formation of spherical nanoparticles of 20–50 nm diameter aggregated into clusters in the size of 100–200 nm. EDX analysis indicated the presence of desired elements in all observed samples. The bandgaps of non-doped and doped samples were determined from the reflectance spectra, and variations of the bandgaps, even small ones, are insufficient indications of doping. These uncertainties are further clarified by investigating crystalline undoped and doped samples in addition to the amorphous ones. XRPD results of the amorphous samples confirmed the amorphous structure, while Le Bail refinements of the crystalline samples show well-defined peaks from only the Sb2S3 phase, indicating a successful doping process. XPS measurements revealed that the phase of the undoped sample is free of impurities and that 3 d peaks of iodine and tin in the doped samples are present. The XPS valence bands shifted towards higher (I) or lower (Sn) binding energies compared to the undoped samples for both amorphous and crystalline samples, which is an additional support that incorporation of dopant ions in the Sb2S3 lattice took place.
T2  - Materials Science in Semiconductor Processing
T1  - Structural, morphological, optical, and electronic properties of amorphous non-doped and I and Sn doped Sb2S3 nanoparticles
VL  - 137
SP  - 106196
DO  - 10.1016/j.mssp.2021.106196
ER  - 

@article{
author = "Lojpur, Vesna and Joschko, Maximilian and Graf, Christina and Radmilović, Nadežda and Novaković, Mirjana M. and Validžić, Ivana Lj.",
year = "2022",
abstract = "Amorphous non-doped, iodine- and tin-doped Sb2S3 nanoparticles were prepared via the hot-injection method. HRTEM of amorphous undoped and doped samples revealed the formation of spherical nanoparticles of 20–50 nm diameter aggregated into clusters in the size of 100–200 nm. EDX analysis indicated the presence of desired elements in all observed samples. The bandgaps of non-doped and doped samples were determined from the reflectance spectra, and variations of the bandgaps, even small ones, are insufficient indications of doping. These uncertainties are further clarified by investigating crystalline undoped and doped samples in addition to the amorphous ones. XRPD results of the amorphous samples confirmed the amorphous structure, while Le Bail refinements of the crystalline samples show well-defined peaks from only the Sb2S3 phase, indicating a successful doping process. XPS measurements revealed that the phase of the undoped sample is free of impurities and that 3 d peaks of iodine and tin in the doped samples are present. The XPS valence bands shifted towards higher (I) or lower (Sn) binding energies compared to the undoped samples for both amorphous and crystalline samples, which is an additional support that incorporation of dopant ions in the Sb2S3 lattice took place.",
journal = "Materials Science in Semiconductor Processing",
title = "Structural, morphological, optical, and electronic properties of amorphous non-doped and I and Sn doped Sb2S3 nanoparticles",
volume = "137",
pages = "106196",
doi = "10.1016/j.mssp.2021.106196"
}

Lojpur, V., Joschko, M., Graf, C., Radmilović, N., Novaković, M. M.,& Validžić, I. Lj.. (2022). Structural, morphological, optical, and electronic properties of amorphous non-doped and I and Sn doped Sb2S3 nanoparticles. in Materials Science in Semiconductor Processing, 137, 106196.
https://doi.org/10.1016/j.mssp.2021.106196

Lojpur V, Joschko M, Graf C, Radmilović N, Novaković MM, Validžić IL. Structural, morphological, optical, and electronic properties of amorphous non-doped and I and Sn doped Sb2S3 nanoparticles. in Materials Science in Semiconductor Processing. 2022;137:106196.
doi:10.1016/j.mssp.2021.106196 .

Lojpur, Vesna, Joschko, Maximilian, Graf, Christina, Radmilović, Nadežda, Novaković, Mirjana M., Validžić, Ivana Lj., "Structural, morphological, optical, and electronic properties of amorphous non-doped and I and Sn doped Sb2S3 nanoparticles" in Materials Science in Semiconductor Processing, 137 (2022):106196,
https://doi.org/10.1016/j.mssp.2021.106196 . .

TY  - CONF
AU  - Radmilović, Nadežda
AU  - Stamenković, Tijana
AU  - Lojpur, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12862
AB  - Luminescent materials emit radiation when exposed to various types of excitation (ultraviolet radiation, X-rays, electron beam, etc.) and can be comprised of a host lattice with dopant as an activator. One of the extensively investigated luminescent materials is monoclinic Ln2 MoO6 due to its high thermal stability. In this study, we investigated Ln2MoO 6 with different concentrations of Er 3+ /Yb3+ concentrations synthetized at temperatures up to 1200o C. The obtained powders were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). The results revealed that all powders are single phase Ln2 MoO6 , with particle size in the nano range at lower treatment temperatures (up to 800 o C) and in the micro range at higher calcination temperatures (up to 1200 o C). Both Y 2 MoO 6 :Yb3+ /Er 3+ and Gd2 MoO 6 : Yb3+ /Er 3+ show double emitting luminescence two green emission bands at 525 and 546 nm (2 H 11/2 , 4 S 3/2 → 4 I 15/2 ) as well as a red emission band at 657 nm ( 4 F 9/2 → 4 I 15/2 ). It can be concluded that increase of Yb3+ concentration leads to change of the green to red ratio showing the ability for fine-tuning of the color output.
PB  - Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade
PB  - Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)
C3  - Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022
T1  - Influence of host lattice on luminescence properties of up-conversion Ln2MoO6 (Ln=Y, Gd) powders co-doped with Er3+/Yb3+ synthesized at high temperatures
SP  - 62
EP  - 62
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12862
ER  - 

@conference{
author = "Radmilović, Nadežda and Stamenković, Tijana and Lojpur, Vesna",
year = "2022",
abstract = "Luminescent materials emit radiation when exposed to various types of excitation (ultraviolet radiation, X-rays, electron beam, etc.) and can be comprised of a host lattice with dopant as an activator. One of the extensively investigated luminescent materials is monoclinic Ln2 MoO6 due to its high thermal stability. In this study, we investigated Ln2MoO 6 with different concentrations of Er 3+ /Yb3+ concentrations synthetized at temperatures up to 1200o C. The obtained powders were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). The results revealed that all powders are single phase Ln2 MoO6 , with particle size in the nano range at lower treatment temperatures (up to 800 o C) and in the micro range at higher calcination temperatures (up to 1200 o C). Both Y 2 MoO 6 :Yb3+ /Er 3+ and Gd2 MoO 6 : Yb3+ /Er 3+ show double emitting luminescence two green emission bands at 525 and 546 nm (2 H 11/2 , 4 S 3/2 → 4 I 15/2 ) as well as a red emission band at 657 nm ( 4 F 9/2 → 4 I 15/2 ). It can be concluded that increase of Yb3+ concentration leads to change of the green to red ratio showing the ability for fine-tuning of the color output.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade, Belgrade : Serbian Society for Innovative Materials in Extreme Conditions (SIM-EXTREME)",
journal = "Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022",
title = "Influence of host lattice on luminescence properties of up-conversion Ln2MoO6 (Ln=Y, Gd) powders co-doped with Er3+/Yb3+ synthesized at high temperatures",
pages = "62-62",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12862"
}

Radmilović, N., Stamenković, T.,& Lojpur, V.. (2022). Influence of host lattice on luminescence properties of up-conversion Ln2MoO6 (Ln=Y, Gd) powders co-doped with Er3+/Yb3+ synthesized at high temperatures. in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022
Belgrade : Vinča Institute of Nuclear Sciences - National Institute of thе Republic of Serbia, University of Belgrade., 62-62.
https://hdl.handle.net/21.15107/rcub_vinar_12862

Radmilović N, Stamenković T, Lojpur V. Influence of host lattice on luminescence properties of up-conversion Ln2MoO6 (Ln=Y, Gd) powders co-doped with Er3+/Yb3+ synthesized at high temperatures. in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022. 2022;:62-62.
https://hdl.handle.net/21.15107/rcub_vinar_12862 .

Radmilović, Nadežda, Stamenković, Tijana, Lojpur, Vesna, "Influence of host lattice on luminescence properties of up-conversion Ln2MoO6 (Ln=Y, Gd) powders co-doped with Er3+/Yb3+ synthesized at high temperatures" in Program and Book of abstracts of the 1st Intentational conference on innovativ materials in extreme conditions IMEC2022 (2022):62-62,
https://hdl.handle.net/21.15107/rcub_vinar_12862 .

TY  - JOUR
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Nikolić, Marko G.
AU  - Erčić, Jelena
AU  - Lojpur, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10437
AB  - In this manuscript, down-conversion nanopowders of SrGd2O4 doped with different concentrations of either Dy3+ or Sm3+ ions were examined in detail. All samples were prepared via glycine-assisted combustion method, primarily burned at 500ºC for 1.5 h and additionally calcined at 1000ºC for 2 h, at ambient room temperature. The XRD analysis showed that all samples crystallize as single phase and the orthorhombic lattice SrGd2O4. TEM analysis determined high degree of crystallinity of samples with grain size of approximately 200 nm for Dy3+ doped and 150 nm for Sm3+ doped SrGd2O4. For both samples SAED confirmed that diffraction rings correspond to the hkl plane indices of SrGd2O4, while EDS confirmed presence of Dy in crystal structure. Results of luminescent characterization demonstrated all appropriate emission peaks related to either Dy3+ or Sm3+ dopant ions. Investigation of dopant concentration revealed that the lowest values of both dopants have the most prominent emission peaks, while coordinates obtained from the CIE diagram showed emission shifting with the change of concentration.
T2  - Science of Sintering
T1  - Structural and Luminescence Properties of SrGd2O4 nanocrystalline Phosphor doped with Dy3+ and Sm3+
VL  - 54
IS  - 3
DO  - 10.2298/SOS2203295S
ER  - 

@article{
author = "Stamenković, Tijana and Radmilović, Nadežda and Nikolić, Marko G. and Erčić, Jelena and Lojpur, Vesna",
year = "2022",
abstract = "In this manuscript, down-conversion nanopowders of SrGd2O4 doped with different concentrations of either Dy3+ or Sm3+ ions were examined in detail. All samples were prepared via glycine-assisted combustion method, primarily burned at 500ºC for 1.5 h and additionally calcined at 1000ºC for 2 h, at ambient room temperature. The XRD analysis showed that all samples crystallize as single phase and the orthorhombic lattice SrGd2O4. TEM analysis determined high degree of crystallinity of samples with grain size of approximately 200 nm for Dy3+ doped and 150 nm for Sm3+ doped SrGd2O4. For both samples SAED confirmed that diffraction rings correspond to the hkl plane indices of SrGd2O4, while EDS confirmed presence of Dy in crystal structure. Results of luminescent characterization demonstrated all appropriate emission peaks related to either Dy3+ or Sm3+ dopant ions. Investigation of dopant concentration revealed that the lowest values of both dopants have the most prominent emission peaks, while coordinates obtained from the CIE diagram showed emission shifting with the change of concentration.",
journal = "Science of Sintering",
title = "Structural and Luminescence Properties of SrGd2O4 nanocrystalline Phosphor doped with Dy3+ and Sm3+",
volume = "54",
number = "3",
doi = "10.2298/SOS2203295S"
}

Stamenković, T., Radmilović, N., Nikolić, M. G., Erčić, J.,& Lojpur, V.. (2022). Structural and Luminescence Properties of SrGd2O4 nanocrystalline Phosphor doped with Dy3+ and Sm3+. in Science of Sintering, 54(3).
https://doi.org/10.2298/SOS2203295S

Stamenković T, Radmilović N, Nikolić MG, Erčić J, Lojpur V. Structural and Luminescence Properties of SrGd2O4 nanocrystalline Phosphor doped with Dy3+ and Sm3+. in Science of Sintering. 2022;54(3).
doi:10.2298/SOS2203295S .

Stamenković, Tijana, Radmilović, Nadežda, Nikolić, Marko G., Erčić, Jelena, Lojpur, Vesna, "Structural and Luminescence Properties of SrGd2O4 nanocrystalline Phosphor doped with Dy3+ and Sm3+" in Science of Sintering, 54, no. 3 (2022),
https://doi.org/10.2298/SOS2203295S . .

TY  - CONF
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Čebela, Maria
AU  - Lojpur, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11511
AB  - Here, samples of SrGd2O4 doped with different concentration of Yb3+ (2, 4, 6 at.%) ions and constant concentration of Tm3+ (1 at.%) were prepared. For preparation of samples, combustion method assisted with glycine as a fuel and citric acid as a chelator was chosen. All samples were heated in the furnace at 500 °C for 1.5 h and additionally thermally treated for 2.5 h at 1000 °C. X-ray diffraction (XRD) revealed that all peaks are assigned to the pure orthorhombic lattice of SrGd2O4, space group Pnma (JCPDS Card No.:01-072-6387). Field emission scanning electron microscopy (FE-SEM) showed agglomerated spherical particles with size around 150 nm. Energy dispersive spectroscopy confirmed uniform distribution of constitutive elements through the samples. Up-conversion emission properties were evaluated from photoluminescent emission spectra and intensity dependence on excitation power after excitation at 980 nm. Dominant blue emission with appropriate transition 1G4 → 3H6 is detected in all samples, for which three photons are required.
PB  - University of Belgrade : Institute for Multidisciplinary Research
C3  - 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade
T1  - Influence of Yb3+ concentration on structural and luminescent properties of Tm3+ doped SrGd2O4
SP  - 37
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11511
ER  - 

@conference{
author = "Stamenković, Tijana and Radmilović, Nadežda and Čebela, Maria and Lojpur, Vesna",
year = "2022",
abstract = "Here, samples of SrGd2O4 doped with different concentration of Yb3+ (2, 4, 6 at.%) ions and constant concentration of Tm3+ (1 at.%) were prepared. For preparation of samples, combustion method assisted with glycine as a fuel and citric acid as a chelator was chosen. All samples were heated in the furnace at 500 °C for 1.5 h and additionally thermally treated for 2.5 h at 1000 °C. X-ray diffraction (XRD) revealed that all peaks are assigned to the pure orthorhombic lattice of SrGd2O4, space group Pnma (JCPDS Card No.:01-072-6387). Field emission scanning electron microscopy (FE-SEM) showed agglomerated spherical particles with size around 150 nm. Energy dispersive spectroscopy confirmed uniform distribution of constitutive elements through the samples. Up-conversion emission properties were evaluated from photoluminescent emission spectra and intensity dependence on excitation power after excitation at 980 nm. Dominant blue emission with appropriate transition 1G4 → 3H6 is detected in all samples, for which three photons are required.",
publisher = "University of Belgrade : Institute for Multidisciplinary Research",
journal = "6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade",
title = "Influence of Yb3+ concentration on structural and luminescent properties of Tm3+ doped SrGd2O4",
pages = "37",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11511"
}

Stamenković, T., Radmilović, N., Čebela, M.,& Lojpur, V.. (2022). Influence of Yb3+ concentration on structural and luminescent properties of Tm3+ doped SrGd2O4. in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade
University of Belgrade : Institute for Multidisciplinary Research., 37.
https://hdl.handle.net/21.15107/rcub_vinar_11511

Stamenković T, Radmilović N, Čebela M, Lojpur V. Influence of Yb3+ concentration on structural and luminescent properties of Tm3+ doped SrGd2O4. in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade. 2022;:37.
https://hdl.handle.net/21.15107/rcub_vinar_11511 .

Stamenković, Tijana, Radmilović, Nadežda, Čebela, Maria, Lojpur, Vesna, "Influence of Yb3+ concentration on structural and luminescent properties of Tm3+ doped SrGd2O4" in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade (2022):37,
https://hdl.handle.net/21.15107/rcub_vinar_11511 .

TY  - CONF
AU  - Dinić, Ivana
AU  - Stamenković, Tijana
AU  - Radmilović, Nadežda
AU  - Vuković, Marina
AU  - Rabasović, Mihailo
AU  - Lojpur, Vesna
AU  - Mančić, Lidija
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10794
AB  - Up-conversion properties of SrGd2O4 nanoparticles co-doped with different Yb3+ and constant Er3+ ions were successfully prepared via sol- gel assisted combustion. Rietveld refinement and scanning/transmission electron microscopy with corresponding energydispersive X-ray spectroscopy revealed that obtained powders are composed of agglomerated nanoparticles with orthorhombic (Pnma) structure that have a uniform distribution of all constituting elements. Photoluminescence measurements implied intensification of the upconversion (UC) emission in the visible part of spectrum with the increase of Yb3+ content, which is followed by a significant change in the green to red ratio. Two-photon UC processes are established as a result of Er3+ f-f electronic transitions: green emission at 523 and 551 nm ( 2 H11/2, 4 S3/2 → 4 I15/2) as well as a red emission at 661 nm (4 F9/2 → 4 I15/2). The highest value of absolute quantum efficiency (0.055%) is determined for SrGd2O4 nanoparticles doped with 0.5 at% of Er3+ and co-doped with 5 at% of Yb3+ (λexc=976 nm, power density 200W/cm2 ).
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade
T1  - Quantum efficiency of up-converting SrGd2O4:Yb,Er nanoparticles
SP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10794
ER  - 

@conference{
author = "Dinić, Ivana and Stamenković, Tijana and Radmilović, Nadežda and Vuković, Marina and Rabasović, Mihailo and Lojpur, Vesna and Mančić, Lidija",
year = "2022",
abstract = "Up-conversion properties of SrGd2O4 nanoparticles co-doped with different Yb3+ and constant Er3+ ions were successfully prepared via sol- gel assisted combustion. Rietveld refinement and scanning/transmission electron microscopy with corresponding energydispersive X-ray spectroscopy revealed that obtained powders are composed of agglomerated nanoparticles with orthorhombic (Pnma) structure that have a uniform distribution of all constituting elements. Photoluminescence measurements implied intensification of the upconversion (UC) emission in the visible part of spectrum with the increase of Yb3+ content, which is followed by a significant change in the green to red ratio. Two-photon UC processes are established as a result of Er3+ f-f electronic transitions: green emission at 523 and 551 nm ( 2 H11/2, 4 S3/2 → 4 I15/2) as well as a red emission at 661 nm (4 F9/2 → 4 I15/2). The highest value of absolute quantum efficiency (0.055%) is determined for SrGd2O4 nanoparticles doped with 0.5 at% of Er3+ and co-doped with 5 at% of Yb3+ (λexc=976 nm, power density 200W/cm2 ).",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade",
title = "Quantum efficiency of up-converting SrGd2O4:Yb,Er nanoparticles",
pages = "59",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10794"
}

Dinić, I., Stamenković, T., Radmilović, N., Vuković, M., Rabasović, M., Lojpur, V.,& Mančić, L.. (2022). Quantum efficiency of up-converting SrGd2O4:Yb,Er nanoparticles. in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade
Belgrade : Serbian Ceramic Society., 59.
https://hdl.handle.net/21.15107/rcub_vinar_10794

Dinić I, Stamenković T, Radmilović N, Vuković M, Rabasović M, Lojpur V, Mančić L. Quantum efficiency of up-converting SrGd2O4:Yb,Er nanoparticles. in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade. 2022;:59.
https://hdl.handle.net/21.15107/rcub_vinar_10794 .

Dinić, Ivana, Stamenković, Tijana, Radmilović, Nadežda, Vuković, Marina, Rabasović, Mihailo, Lojpur, Vesna, Mančić, Lidija, "Quantum efficiency of up-converting SrGd2O4:Yb,Er nanoparticles" in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade (2022):59,
https://hdl.handle.net/21.15107/rcub_vinar_10794 .

TY  - CONF
AU  - Stamenković, Tijana
AU  - Lojpur, Vesna
AU  - Radmilović, Nadežda
AU  - Vuković, Marina
AU  - Dinić, Ivana
AU  - Mančić, Lidija
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10807
AB  - Optically active materials have a wide range of applications. The phenomenon of light conversion includes two main types: up-conversion, which is the ability of convertion lower energy photons into the ones with the higher energy, and down-conversion, which is vice versa. Orthorhorhombic SrGd2O4 doped with rare earth elements is established to have promising optical characteristics, but rarely explored until nowadays as up-converting material. Due to the phonon energy of around 475 cm-1, which is lower than in many other compounds commonly used hosts, this one has a great perspective as an optically active material. Here, for the first time two combinations of rare earth dopant ions, Yb3+/Ho3+ and Yb3+/Tm3+, with different mutual ratios were chosen as pairs for inducing up-conversion. Sol-gel assisted combustion synthesis, which comprises citric acid as chelator and glycine as fuel, was used to obtain powdered samples that are subsequently thermally treated for 3.5 h at 1100°C. X-ray powder diffraction analysis (XRPD) was performed to determine crystal structure. Morphology characteristics were observed by scanning and transmission electron microscopy (SEM/TEM). Photoluminescent up-converting properties were measured in function of laser power (976 nm) in order to define optimal doping concentration and upconversion mechanism.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade
T1  - Optically active SrGd2O4 phase: Yb3+/Ho3+ and Yb3+/Tm3+ co-doping
SP  - 76
EP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10807
ER  - 

@conference{
author = "Stamenković, Tijana and Lojpur, Vesna and Radmilović, Nadežda and Vuković, Marina and Dinić, Ivana and Mančić, Lidija",
year = "2022",
abstract = "Optically active materials have a wide range of applications. The phenomenon of light conversion includes two main types: up-conversion, which is the ability of convertion lower energy photons into the ones with the higher energy, and down-conversion, which is vice versa. Orthorhorhombic SrGd2O4 doped with rare earth elements is established to have promising optical characteristics, but rarely explored until nowadays as up-converting material. Due to the phonon energy of around 475 cm-1, which is lower than in many other compounds commonly used hosts, this one has a great perspective as an optically active material. Here, for the first time two combinations of rare earth dopant ions, Yb3+/Ho3+ and Yb3+/Tm3+, with different mutual ratios were chosen as pairs for inducing up-conversion. Sol-gel assisted combustion synthesis, which comprises citric acid as chelator and glycine as fuel, was used to obtain powdered samples that are subsequently thermally treated for 3.5 h at 1100°C. X-ray powder diffraction analysis (XRPD) was performed to determine crystal structure. Morphology characteristics were observed by scanning and transmission electron microscopy (SEM/TEM). Photoluminescent up-converting properties were measured in function of laser power (976 nm) in order to define optimal doping concentration and upconversion mechanism.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade",
title = "Optically active SrGd2O4 phase: Yb3+/Ho3+ and Yb3+/Tm3+ co-doping",
pages = "76-77",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10807"
}

Stamenković, T., Lojpur, V., Radmilović, N., Vuković, M., Dinić, I.,& Mančić, L.. (2022). Optically active SrGd2O4 phase: Yb3+/Ho3+ and Yb3+/Tm3+ co-doping. in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade
Belgrade : Serbian Ceramic Society., 76-77.
https://hdl.handle.net/21.15107/rcub_vinar_10807

Stamenković T, Lojpur V, Radmilović N, Vuković M, Dinić I, Mančić L. Optically active SrGd2O4 phase: Yb3+/Ho3+ and Yb3+/Tm3+ co-doping. in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade. 2022;:76-77.
https://hdl.handle.net/21.15107/rcub_vinar_10807 .

Stamenković, Tijana, Lojpur, Vesna, Radmilović, Nadežda, Vuković, Marina, Dinić, Ivana, Mančić, Lidija, "Optically active SrGd2O4 phase: Yb3+/Ho3+ and Yb3+/Tm3+ co-doping" in Advanced Ceramics and Application : 10th Serbian Ceramic Society Conference : program and the book of abstracts; September 26-27, 2022; Belgrade (2022):76-77,
https://hdl.handle.net/21.15107/rcub_vinar_10807 .

TY  - JOUR
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
AU  - Ivanović, Marija M.
AU  - Mirković, Miljana M.
AU  - Radmilović, Nadežda
AU  - Rakočević, Lazar
AU  - Nenadović, Miloš
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10032
AB  - The present work was focused on doping of 1% and 5% both of Nd2O3 and Sm2O3 in geopolymer gels. One of the main goals was to determine the influence of the behavior of Nd and Sm as dopants and structural nanoparticles changes of the final geopolymer formed. It is shown that the disorder formed by alkali activation of metakaolin can accommodate the rare earth cations Nd3+ and Sm3+ into their aluminosilicate framework structure. The main geopolymerization product identified in gels is Al-rich (Na)-AS-H gel comprising Al and Si in tetrahedral coordination. Na+ ions were balancing the negative charge resulting from Al3+ in tetrahedral coordination. The changes in the structures of the final product (geopolymer/Nd2O3; Sm2O3), has been characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analysis with energy dispersive spectrometry (EDS). Nucleation at the seed surfaces leads to the formation of phase-separated gels from rare earth phase early in the reaction process. It is confirmed that Nd and Sm have been shown to form unstable hydroxides Nd(OH)3 and Sm(OH)3 that are in equilibrium with the corresponding oxides.
T2  - Gels
T1  - Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium
VL  - 7
IS  - 4
SP  - 195
DO  - 10.3390/gels7040195
ER  - 

@article{
author = "Nenadović, Snežana S. and Kljajević, Ljiljana M. and Ivanović, Marija M. and Mirković, Miljana M. and Radmilović, Nadežda and Rakočević, Lazar and Nenadović, Miloš",
year = "2021",
abstract = "The present work was focused on doping of 1% and 5% both of Nd2O3 and Sm2O3 in geopolymer gels. One of the main goals was to determine the influence of the behavior of Nd and Sm as dopants and structural nanoparticles changes of the final geopolymer formed. It is shown that the disorder formed by alkali activation of metakaolin can accommodate the rare earth cations Nd3+ and Sm3+ into their aluminosilicate framework structure. The main geopolymerization product identified in gels is Al-rich (Na)-AS-H gel comprising Al and Si in tetrahedral coordination. Na+ ions were balancing the negative charge resulting from Al3+ in tetrahedral coordination. The changes in the structures of the final product (geopolymer/Nd2O3; Sm2O3), has been characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analysis with energy dispersive spectrometry (EDS). Nucleation at the seed surfaces leads to the formation of phase-separated gels from rare earth phase early in the reaction process. It is confirmed that Nd and Sm have been shown to form unstable hydroxides Nd(OH)3 and Sm(OH)3 that are in equilibrium with the corresponding oxides.",
journal = "Gels",
title = "Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium",
volume = "7",
number = "4",
pages = "195",
doi = "10.3390/gels7040195"
}

Nenadović, S. S., Kljajević, L. M., Ivanović, M. M., Mirković, M. M., Radmilović, N., Rakočević, L.,& Nenadović, M.. (2021). Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium. in Gels, 7(4), 195.
https://doi.org/10.3390/gels7040195

Nenadović SS, Kljajević LM, Ivanović MM, Mirković MM, Radmilović N, Rakočević L, Nenadović M. Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium. in Gels. 2021;7(4):195.
doi:10.3390/gels7040195 .

Nenadović, Snežana S., Kljajević, Ljiljana M., Ivanović, Marija M., Mirković, Miljana M., Radmilović, Nadežda, Rakočević, Lazar, Nenadović, Miloš, "Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium" in Gels, 7, no. 4 (2021):195,
https://doi.org/10.3390/gels7040195 . .

TY  - JOUR
AU  - Stanković, Nadežda
AU  - Nikolić, Marko G.
AU  - Jelenković, Branislav
AU  - Daneu, Nina
AU  - Maletaškić, Jelena
AU  - Prekajski-Đorđević, Marija D.
AU  - Matović, Branko
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9009
AB  - In the last decade, an immense progress has been made in white LEDs, mainly due to the development of red-emitting phosphors. In this paper, we report on the synthesis of Eu3+ activated Y2MoO6 by a self-initiated and self-sustained method. The obtained powder was calcined at various temperatures in the 600–1400 °C range and examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). The results revealed that all powders are single phase Y2MoO6:Eu3+, with particle size in the nanorange at lower treatment temperatures (600 and 800 °C) and in the microrange at higher calcination temperatures (1000–1400 °C). The obtained powders are promising materials for white light-emitting diodes as they can efficiently absorb energy in 324–425 nm region (near-UV to blue light region) and emit at 611 nm in the red region of the spectrum, while exhibiting high thermal and chemical stability.
T2  - Processing and Application of Ceramics
T1  - Luminescence properties of Eu3+ activated Y2MoO6 powders calcined at different temperatures
VL  - 14
IS  - 1
SP  - 71
EP  - 76
DO  - 10.2298/PAC2001071S
ER  - 

@article{
author = "Stanković, Nadežda and Nikolić, Marko G. and Jelenković, Branislav and Daneu, Nina and Maletaškić, Jelena and Prekajski-Đorđević, Marija D. and Matović, Branko",
year = "2020",
abstract = "In the last decade, an immense progress has been made in white LEDs, mainly due to the development of red-emitting phosphors. In this paper, we report on the synthesis of Eu3+ activated Y2MoO6 by a self-initiated and self-sustained method. The obtained powder was calcined at various temperatures in the 600–1400 °C range and examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy (PL). The results revealed that all powders are single phase Y2MoO6:Eu3+, with particle size in the nanorange at lower treatment temperatures (600 and 800 °C) and in the microrange at higher calcination temperatures (1000–1400 °C). The obtained powders are promising materials for white light-emitting diodes as they can efficiently absorb energy in 324–425 nm region (near-UV to blue light region) and emit at 611 nm in the red region of the spectrum, while exhibiting high thermal and chemical stability.",
journal = "Processing and Application of Ceramics",
title = "Luminescence properties of Eu3+ activated Y2MoO6 powders calcined at different temperatures",
volume = "14",
number = "1",
pages = "71-76",
doi = "10.2298/PAC2001071S"
}

Stanković, N., Nikolić, M. G., Jelenković, B., Daneu, N., Maletaškić, J., Prekajski-Đorđević, M. D.,& Matović, B.. (2020). Luminescence properties of Eu3+ activated Y2MoO6 powders calcined at different temperatures. in Processing and Application of Ceramics, 14(1), 71-76.
https://doi.org/10.2298/PAC2001071S

Stanković N, Nikolić MG, Jelenković B, Daneu N, Maletaškić J, Prekajski-Đorđević MD, Matović B. Luminescence properties of Eu3+ activated Y2MoO6 powders calcined at different temperatures. in Processing and Application of Ceramics. 2020;14(1):71-76.
doi:10.2298/PAC2001071S .

Stanković, Nadežda, Nikolić, Marko G., Jelenković, Branislav, Daneu, Nina, Maletaškić, Jelena, Prekajski-Đorđević, Marija D., Matović, Branko, "Luminescence properties of Eu3+ activated Y2MoO6 powders calcined at different temperatures" in Processing and Application of Ceramics, 14, no. 1 (2020):71-76,
https://doi.org/10.2298/PAC2001071S . .

TY  - JOUR
AU  - Tomić, Miloš
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Trifković, Kata
AU  - Stanković, Nadežda
AU  - Pavlović, Vladimir B.
AU  - Bajat, Jelena B.
AU  - Đonlagić, Jasna A.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0300944018312487
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8076
AB  - In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite®Na + ) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved. © 2019 Elsevier B.V.
T2  - Progress in Organic Coatings
T1  - Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites
VL  - 131
SP  - 311
EP  - 321
DO  - 10.1016/j.porgcoat.2019.02.037
ER  - 

@article{
author = "Tomić, Miloš and Dunjić, Branko and Nikolić, Marija S. and Trifković, Kata and Stanković, Nadežda and Pavlović, Vladimir B. and Bajat, Jelena B. and Đonlagić, Jasna A.",
year = "2019",
abstract = "In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite®Na + ) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved. © 2019 Elsevier B.V.",
journal = "Progress in Organic Coatings",
title = "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites",
volume = "131",
pages = "311-321",
doi = "10.1016/j.porgcoat.2019.02.037"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Trifković, K., Stanković, N., Pavlović, V. B., Bajat, J. B.,& Đonlagić, J. A.. (2019). Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings, 131, 311-321.
https://doi.org/10.1016/j.porgcoat.2019.02.037

Tomić M, Dunjić B, Nikolić MS, Trifković K, Stanković N, Pavlović VB, Bajat JB, Đonlagić JA. Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings. 2019;131:311-321.
doi:10.1016/j.porgcoat.2019.02.037 .

Tomić, Miloš, Dunjić, Branko, Nikolić, Marija S., Trifković, Kata, Stanković, Nadežda, Pavlović, Vladimir B., Bajat, Jelena B., Đonlagić, Jasna A., "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites" in Progress in Organic Coatings, 131 (2019):311-321,
https://doi.org/10.1016/j.porgcoat.2019.02.037 . .

TY  - JOUR
AU  - Prekajski-Đorđević, Marija D.
AU  - Maletaškić, Jelena
AU  - Stanković, Nadežda
AU  - Babić, Biljana M.
AU  - Yoshida, Katsumi
AU  - Yano, Toyohiko
AU  - Matović, Branko
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1874
AB  - Hydroxyapatite was used as the inert matrix for in-situ immobilization of strontium (Sr) radioactive isotopes at room temperature. A nano-emulsification method was applied to synthesize Sr-substituted calcium hydroxyapatite (Ca1-xSrx)PO4)(6)(OH)(2). The concentration of incorporated Sr was in the range of 0 LT = x LT = 1. Immobilization of Sr was evaluated using a stable isotope instead of radioactive isotope. The effect of strontium concentration on the crystal structure was studied and the results have showed that in the whole concentration range, Sr forms solid solutions with the host hydroxyapatite crystal structure. Powders comprised of nanometre sized particles were obtained and their properties, such as crystallite and particle size, changes in lattice parameters as function of dopant content and thermal stability, were further examined. It was found that the crystal structure of obtained powders is thermally stable at high temperatures. No secondary phases were formed in as-prepared powders or during calcination. The results in this study showed that nano-emulsion strategy provides a simple pathway for synthesis of a single-phase Sr-substituted hydroxyapatite, which can be used for immobilization of Sr radioactive isotopes.
T2  - Ceramics International
T1  - In-situ immobilization of Sr radioactive isotope using nanocrystalline hydroxyapatite
VL  - 44
IS  - 2
SP  - 1771
EP  - 1777
DO  - 10.1016/j.ceramint.2017.10.110
ER  - 

@article{
author = "Prekajski-Đorđević, Marija D. and Maletaškić, Jelena and Stanković, Nadežda and Babić, Biljana M. and Yoshida, Katsumi and Yano, Toyohiko and Matović, Branko",
year = "2018",
abstract = "Hydroxyapatite was used as the inert matrix for in-situ immobilization of strontium (Sr) radioactive isotopes at room temperature. A nano-emulsification method was applied to synthesize Sr-substituted calcium hydroxyapatite (Ca1-xSrx)PO4)(6)(OH)(2). The concentration of incorporated Sr was in the range of 0 LT = x LT = 1. Immobilization of Sr was evaluated using a stable isotope instead of radioactive isotope. The effect of strontium concentration on the crystal structure was studied and the results have showed that in the whole concentration range, Sr forms solid solutions with the host hydroxyapatite crystal structure. Powders comprised of nanometre sized particles were obtained and their properties, such as crystallite and particle size, changes in lattice parameters as function of dopant content and thermal stability, were further examined. It was found that the crystal structure of obtained powders is thermally stable at high temperatures. No secondary phases were formed in as-prepared powders or during calcination. The results in this study showed that nano-emulsion strategy provides a simple pathway for synthesis of a single-phase Sr-substituted hydroxyapatite, which can be used for immobilization of Sr radioactive isotopes.",
journal = "Ceramics International",
title = "In-situ immobilization of Sr radioactive isotope using nanocrystalline hydroxyapatite",
volume = "44",
number = "2",
pages = "1771-1777",
doi = "10.1016/j.ceramint.2017.10.110"
}

Prekajski-Đorđević, M. D., Maletaškić, J., Stanković, N., Babić, B. M., Yoshida, K., Yano, T.,& Matović, B.. (2018). In-situ immobilization of Sr radioactive isotope using nanocrystalline hydroxyapatite. in Ceramics International, 44(2), 1771-1777.
https://doi.org/10.1016/j.ceramint.2017.10.110

Prekajski-Đorđević MD, Maletaškić J, Stanković N, Babić BM, Yoshida K, Yano T, Matović B. In-situ immobilization of Sr radioactive isotope using nanocrystalline hydroxyapatite. in Ceramics International. 2018;44(2):1771-1777.
doi:10.1016/j.ceramint.2017.10.110 .

Prekajski-Đorđević, Marija D., Maletaškić, Jelena, Stanković, Nadežda, Babić, Biljana M., Yoshida, Katsumi, Yano, Toyohiko, Matović, Branko, "In-situ immobilization of Sr radioactive isotope using nanocrystalline hydroxyapatite" in Ceramics International, 44, no. 2 (2018):1771-1777,
https://doi.org/10.1016/j.ceramint.2017.10.110 . .

TY  - JOUR
AU  - Maletaškić, Jelena
AU  - Stanković, Nadežda
AU  - Daneu, Nina
AU  - Babić, Biljana M.
AU  - Stoiljković, Milovan
AU  - Yoshida, Katsumi
AU  - Matović, Branko
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7663
AB  - Nanofibrous silica with a high surface area was produced from chrysotile by the acid-leaching method. Natural mineral chrysotile asbestos from Stragari, Korlace in Serbia was used as the starting material. The fibers were modified by chemical treatment with 1 M HCl and the mineral dissolution was monitored by transmission electron microscopy, X-ray powder diffraction, inductively coupled plasma spectrometry and low-temperature nitrogen adsorption techniques to highlight the effects of the leaching process. The results showed that the applied concentration of acid solution and processing time of 4 h were sufficient to effectively remove the magnesium hydroxide layer and transform the crystal structure of the hazardous starting chrysotile to porous SiO2 nanofibers. With prolonged acid leaching, the specific surface area, S (BET), calculated by BET equation, was increased from 147 up to 435 m(2) g(- 1), with micropores representing a significant part of the specific surface.
T2  - Physics and Chemistry of Minerals
T1  - Acid leaching of natural chrysotile asbestos to mesoporous silica fibers
VL  - 45
IS  - 4
SP  - 343
EP  - 351
DO  - 10.1007/s00269-017-0924-z
ER  - 

@article{
author = "Maletaškić, Jelena and Stanković, Nadežda and Daneu, Nina and Babić, Biljana M. and Stoiljković, Milovan and Yoshida, Katsumi and Matović, Branko",
year = "2018",
abstract = "Nanofibrous silica with a high surface area was produced from chrysotile by the acid-leaching method. Natural mineral chrysotile asbestos from Stragari, Korlace in Serbia was used as the starting material. The fibers were modified by chemical treatment with 1 M HCl and the mineral dissolution was monitored by transmission electron microscopy, X-ray powder diffraction, inductively coupled plasma spectrometry and low-temperature nitrogen adsorption techniques to highlight the effects of the leaching process. The results showed that the applied concentration of acid solution and processing time of 4 h were sufficient to effectively remove the magnesium hydroxide layer and transform the crystal structure of the hazardous starting chrysotile to porous SiO2 nanofibers. With prolonged acid leaching, the specific surface area, S (BET), calculated by BET equation, was increased from 147 up to 435 m(2) g(- 1), with micropores representing a significant part of the specific surface.",
journal = "Physics and Chemistry of Minerals",
title = "Acid leaching of natural chrysotile asbestos to mesoporous silica fibers",
volume = "45",
number = "4",
pages = "343-351",
doi = "10.1007/s00269-017-0924-z"
}

Maletaškić, J., Stanković, N., Daneu, N., Babić, B. M., Stoiljković, M., Yoshida, K.,& Matović, B.. (2018). Acid leaching of natural chrysotile asbestos to mesoporous silica fibers. in Physics and Chemistry of Minerals, 45(4), 343-351.
https://doi.org/10.1007/s00269-017-0924-z

Maletaškić J, Stanković N, Daneu N, Babić BM, Stoiljković M, Yoshida K, Matović B. Acid leaching of natural chrysotile asbestos to mesoporous silica fibers. in Physics and Chemistry of Minerals. 2018;45(4):343-351.
doi:10.1007/s00269-017-0924-z .

Maletaškić, Jelena, Stanković, Nadežda, Daneu, Nina, Babić, Biljana M., Stoiljković, Milovan, Yoshida, Katsumi, Matović, Branko, "Acid leaching of natural chrysotile asbestos to mesoporous silica fibers" in Physics and Chemistry of Minerals, 45, no. 4 (2018):343-351,
https://doi.org/10.1007/s00269-017-0924-z . .

TY  - JOUR
AU  - Božić, Dušan
AU  - Stanković, Nadežda
AU  - Ružić, Jovana
AU  - Stašić, Jelena
PY  - 2018
UR  - http://link.springer.com/10.1007/s00170-018-1839-7
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7752
AB  - The sintering of Fe-Cu and Fe-Cu-Ni3Al powder compacts by laser beam was studied to determine densification, microstructural development, and microhardness before and after thermo-mechanical treatments. Laser sintering (LS) was conducted using pulsed Nd:YAG laser, and optimum parameters of pulse energy, pulse length, pulse frequency, scanning speed, hatch spacing, and layer thickness were determined. Also, the effects of solidification rate, cold deformation (10%), and the addition of complex intermetallic Ni3Al (Fe, Ti, B) on microhardness were analyzed before and after the aging process. It was concluded that rapidly solidified structure, as well as the presence of Ni3Al particles and metastable CuFe phase, which are a product of laser sintering, affected a higher degree of iron matrix hardening which was retained up to high temperatures. Originality of investigations presented in this paper is in the employment of laser for synthesis of Fe-Cu-Ni3Al alloy, which was not discussed in the literature so far. Realization of this complex synthesis required consideration and adaptation of the laser sintering method which has been successfully applied for other types of alloys.
T2  - The International Journal of Advanced Manufacturing Technology
T1  - Synthesis and multiple hardening of a rapidly solidified iron-based matrix
VL  - 96
IS  - 9-12
SP  - 4009
EP  - 4019
DO  - 10.1007/s00170-018-1839-7
ER  - 

@article{
author = "Božić, Dušan and Stanković, Nadežda and Ružić, Jovana and Stašić, Jelena",
year = "2018",
abstract = "The sintering of Fe-Cu and Fe-Cu-Ni3Al powder compacts by laser beam was studied to determine densification, microstructural development, and microhardness before and after thermo-mechanical treatments. Laser sintering (LS) was conducted using pulsed Nd:YAG laser, and optimum parameters of pulse energy, pulse length, pulse frequency, scanning speed, hatch spacing, and layer thickness were determined. Also, the effects of solidification rate, cold deformation (10%), and the addition of complex intermetallic Ni3Al (Fe, Ti, B) on microhardness were analyzed before and after the aging process. It was concluded that rapidly solidified structure, as well as the presence of Ni3Al particles and metastable CuFe phase, which are a product of laser sintering, affected a higher degree of iron matrix hardening which was retained up to high temperatures. Originality of investigations presented in this paper is in the employment of laser for synthesis of Fe-Cu-Ni3Al alloy, which was not discussed in the literature so far. Realization of this complex synthesis required consideration and adaptation of the laser sintering method which has been successfully applied for other types of alloys.",
journal = "The International Journal of Advanced Manufacturing Technology",
title = "Synthesis and multiple hardening of a rapidly solidified iron-based matrix",
volume = "96",
number = "9-12",
pages = "4009-4019",
doi = "10.1007/s00170-018-1839-7"
}

Božić, D., Stanković, N., Ružić, J.,& Stašić, J.. (2018). Synthesis and multiple hardening of a rapidly solidified iron-based matrix. in The International Journal of Advanced Manufacturing Technology, 96(9-12), 4009-4019.
https://doi.org/10.1007/s00170-018-1839-7

Božić D, Stanković N, Ružić J, Stašić J. Synthesis and multiple hardening of a rapidly solidified iron-based matrix. in The International Journal of Advanced Manufacturing Technology. 2018;96(9-12):4009-4019.
doi:10.1007/s00170-018-1839-7 .

Božić, Dušan, Stanković, Nadežda, Ružić, Jovana, Stašić, Jelena, "Synthesis and multiple hardening of a rapidly solidified iron-based matrix" in The International Journal of Advanced Manufacturing Technology, 96, no. 9-12 (2018):4009-4019,
https://doi.org/10.1007/s00170-018-1839-7 . .

TY  - JOUR
AU  - Bošković, Ivana V.
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
AU  - Vukanac, Ivana
AU  - Stanković, Nadežda
AU  - Lukovic, Jelena M.
AU  - Vukčević, Mira
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=1451-39941802188B
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7881
AB  - A significant amount of red mud generated as a by-product of the Bayer process in the aluminum industry may cause environmental problems if appropriate treatment is not carried out. The presented research dealt with the possibility of application of red mud as a pigment or as raw material for use in the construction material industry. In relation to the aim of this work, the physicochemical characterization was performed and the natural radioactivity of red mud as an industrial waste and a geopolymer sample based on it was determined. The presented research is a contribution to the potential solution for environmental protection through the synthesis of possible construction material based on red mud. The radiological hazard orginating from226Ra,232Th, and40K in the samples was assesed throught the absorbed dose rate and the annual effective dose rate, calculated in accordance with the UNSCEAR 2010 report. Physicochemical characterization of all samples was conducted using X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. © 2018, Vinca Inst Nuclear Sci. All rights reserved.
T2  - Nuclear Technology and Radiation Protection
T1  - Radiological and physicochemical properties of red mud based geopolymers
VL  - 33
IS  - 2
SP  - 188
EP  - 194
DO  - 10.2298/NTRP1802188B
ER  - 

@article{
author = "Bošković, Ivana V. and Nenadović, Snežana S. and Kljajević, Ljiljana M. and Vukanac, Ivana and Stanković, Nadežda and Lukovic, Jelena M. and Vukčević, Mira",
year = "2018",
abstract = "A significant amount of red mud generated as a by-product of the Bayer process in the aluminum industry may cause environmental problems if appropriate treatment is not carried out. The presented research dealt with the possibility of application of red mud as a pigment or as raw material for use in the construction material industry. In relation to the aim of this work, the physicochemical characterization was performed and the natural radioactivity of red mud as an industrial waste and a geopolymer sample based on it was determined. The presented research is a contribution to the potential solution for environmental protection through the synthesis of possible construction material based on red mud. The radiological hazard orginating from226Ra,232Th, and40K in the samples was assesed throught the absorbed dose rate and the annual effective dose rate, calculated in accordance with the UNSCEAR 2010 report. Physicochemical characterization of all samples was conducted using X-ray diffraction and diffuse reflectance infrared Fourier transform spectroscopy. © 2018, Vinca Inst Nuclear Sci. All rights reserved.",
journal = "Nuclear Technology and Radiation Protection",
title = "Radiological and physicochemical properties of red mud based geopolymers",
volume = "33",
number = "2",
pages = "188-194",
doi = "10.2298/NTRP1802188B"
}

Bošković, I. V., Nenadović, S. S., Kljajević, L. M., Vukanac, I., Stanković, N., Lukovic, J. M.,& Vukčević, M.. (2018). Radiological and physicochemical properties of red mud based geopolymers. in Nuclear Technology and Radiation Protection, 33(2), 188-194.
https://doi.org/10.2298/NTRP1802188B

Bošković IV, Nenadović SS, Kljajević LM, Vukanac I, Stanković N, Lukovic JM, Vukčević M. Radiological and physicochemical properties of red mud based geopolymers. in Nuclear Technology and Radiation Protection. 2018;33(2):188-194.
doi:10.2298/NTRP1802188B .

Bošković, Ivana V., Nenadović, Snežana S., Kljajević, Ljiljana M., Vukanac, Ivana, Stanković, Nadežda, Lukovic, Jelena M., Vukčević, Mira, "Radiological and physicochemical properties of red mud based geopolymers" in Nuclear Technology and Radiation Protection, 33, no. 2 (2018):188-194,
https://doi.org/10.2298/NTRP1802188B . .

TY  - CONF
AU  - Nikolić, Marko G.
AU  - Vlašić, Ana
AU  - Rabasović, Mihailo
AU  - Murić, Branka
AU  - Čelebonović, Vladan
AU  - Stanković, Nadežda
AU  - Matović, Branko
AU  - Jelenković, Branislav
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10878
AB  - Rare earth ions (RE3+) are highly sensitive to local symmetry so changing the symmetry is reflected in their luminescence spectra. In this work we investigated the high pressure photoluminescence properties of cubic and monoclinic Y2O3, as well as, monoclinic Y2MoO6, doped either with Eu3+ or Sm3+ ions. Photoluminescence emission of cubic Y2O3 :Sm3+ and Y2O3 :Eu3+ phases were recorded up to the pressure of 20 GPa and 15 GPa, respectively. With varying pressure, the intensity ratio of 4G5/2 → 6H7/2 and 4F3/2 → 6H7/2 Sm3+ emission shows three distinct regions. Furthermore, the intensity ratio of 5D0 → 7F1 and 5D0 → 7F2 Eu3+ emission of the cubic matrix has similar pressure dependence as Sm3+ doped phase. A steep pressure dependence evident in the range of 9.2-13.1 GPa could be used for detecting a pressure induced cubic to monoclinic phase transition of Y2O3 matrix. It matches well the behavior of the pressure sensitive Sm3+ spectra in the range of 9.1-11.6 GPa, which is proven to appear due to a phase transition at ~ 11 GPa. The monoclinic Y2O3 :Eu3+ also has a pressure-sensitive intensity ratio of 5D0→7F1 and 5D0→7F2 emission lines. Measurements for the monoclinic Y2O3 :Eu3+ matrix were recorded up to 8 GPa. The dependence is unambiguous, without any phase transitions in the measured region. The nature and high sensitivity suggests that this dependence can be used as an efficient high pressure sensor. Photoluminescence emission measurements of Y2MoO6:Sm3+ and Y2MoO6:Eu3+ phases were recorded up to 12 and 11.5 GPa, respectivelly. Intensity ratio variation of 4G5/2→6H5/2 and 4G5/2→6H7/2 Sm3+ emission lines, as well as of 5D0 → 7F1 and 5D0 → 7F2 Eu3+ emission lines as a function of pressure can be also used for detection of the Y2MoO6 phase transition. The accomplished results demonstrate the properties of Y2MoO6:Sm3+ and Y2MoO6:Eu3+ inorganic phosphors, with emmision linear dependance of the intensity ratio on the pressure up to 8 GPa, could be used as an efficient high pressure sensor.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 7th Serbian Ceramic Society Conference : program and the book of abstracts; September 17-19, 2018; Belgrade
T1  - Detection of high pressure phase transitions in RE3+ doped Y2O3 and Y2MoO6 through luminescence measurements
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10878
ER  - 

@conference{
author = "Nikolić, Marko G. and Vlašić, Ana and Rabasović, Mihailo and Murić, Branka and Čelebonović, Vladan and Stanković, Nadežda and Matović, Branko and Jelenković, Branislav",
year = "2018",
abstract = "Rare earth ions (RE3+) are highly sensitive to local symmetry so changing the symmetry is reflected in their luminescence spectra. In this work we investigated the high pressure photoluminescence properties of cubic and monoclinic Y2O3, as well as, monoclinic Y2MoO6, doped either with Eu3+ or Sm3+ ions. Photoluminescence emission of cubic Y2O3 :Sm3+ and Y2O3 :Eu3+ phases were recorded up to the pressure of 20 GPa and 15 GPa, respectively. With varying pressure, the intensity ratio of 4G5/2 → 6H7/2 and 4F3/2 → 6H7/2 Sm3+ emission shows three distinct regions. Furthermore, the intensity ratio of 5D0 → 7F1 and 5D0 → 7F2 Eu3+ emission of the cubic matrix has similar pressure dependence as Sm3+ doped phase. A steep pressure dependence evident in the range of 9.2-13.1 GPa could be used for detecting a pressure induced cubic to monoclinic phase transition of Y2O3 matrix. It matches well the behavior of the pressure sensitive Sm3+ spectra in the range of 9.1-11.6 GPa, which is proven to appear due to a phase transition at ~ 11 GPa. The monoclinic Y2O3 :Eu3+ also has a pressure-sensitive intensity ratio of 5D0→7F1 and 5D0→7F2 emission lines. Measurements for the monoclinic Y2O3 :Eu3+ matrix were recorded up to 8 GPa. The dependence is unambiguous, without any phase transitions in the measured region. The nature and high sensitivity suggests that this dependence can be used as an efficient high pressure sensor. Photoluminescence emission measurements of Y2MoO6:Sm3+ and Y2MoO6:Eu3+ phases were recorded up to 12 and 11.5 GPa, respectivelly. Intensity ratio variation of 4G5/2→6H5/2 and 4G5/2→6H7/2 Sm3+ emission lines, as well as of 5D0 → 7F1 and 5D0 → 7F2 Eu3+ emission lines as a function of pressure can be also used for detection of the Y2MoO6 phase transition. The accomplished results demonstrate the properties of Y2MoO6:Sm3+ and Y2MoO6:Eu3+ inorganic phosphors, with emmision linear dependance of the intensity ratio on the pressure up to 8 GPa, could be used as an efficient high pressure sensor.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 7th Serbian Ceramic Society Conference : program and the book of abstracts; September 17-19, 2018; Belgrade",
title = "Detection of high pressure phase transitions in RE3+ doped Y2O3 and Y2MoO6 through luminescence measurements",
pages = "51",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10878"
}

Nikolić, M. G., Vlašić, A., Rabasović, M., Murić, B., Čelebonović, V., Stanković, N., Matović, B.,& Jelenković, B.. (2018). Detection of high pressure phase transitions in RE3+ doped Y2O3 and Y2MoO6 through luminescence measurements. in Advanced Ceramics and Application : 7th Serbian Ceramic Society Conference : program and the book of abstracts; September 17-19, 2018; Belgrade
Belgrade : Serbian Ceramic Society., 51.
https://hdl.handle.net/21.15107/rcub_vinar_10878

Nikolić MG, Vlašić A, Rabasović M, Murić B, Čelebonović V, Stanković N, Matović B, Jelenković B. Detection of high pressure phase transitions in RE3+ doped Y2O3 and Y2MoO6 through luminescence measurements. in Advanced Ceramics and Application : 7th Serbian Ceramic Society Conference : program and the book of abstracts; September 17-19, 2018; Belgrade. 2018;:51.
https://hdl.handle.net/21.15107/rcub_vinar_10878 .

Nikolić, Marko G., Vlašić, Ana, Rabasović, Mihailo, Murić, Branka, Čelebonović, Vladan, Stanković, Nadežda, Matović, Branko, Jelenković, Branislav, "Detection of high pressure phase transitions in RE3+ doped Y2O3 and Y2MoO6 through luminescence measurements" in Advanced Ceramics and Application : 7th Serbian Ceramic Society Conference : program and the book of abstracts; September 17-19, 2018; Belgrade (2018):51,
https://hdl.handle.net/21.15107/rcub_vinar_10878 .

TY  - JOUR
AU  - Nikolić, Marija S.
AU  - Petrović, Rada
AU  - Veljović, Đorđe N.
AU  - Ćosović, Vladan
AU  - Stanković, Nadežda
AU  - Đonlagić, Jasna A.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1899
AB  - Poly(epsilon-caprolactone) (PCL) based nanocomposites with unmodified and organomodified sepiolites were prepared by solution casting method. The sepiolites were modified with short (3-mercaptopropyl)trimethoxysilane (SEP-SI) by using covalent grafting or with long hexadecylamine (SEP-HDA) by using ionic exchange. In order to reveal the influence of the organomodification on the nanoclay dispersion and the properties of the nano composites XRD, DSC, TG, SEM, TEM, optical microscopy, melt rheology and dynamic-mechanical analyses were performed. A better dispersion was achieved when organomodified sepiolites instead of native ones were used as fillers. As deduced from the melt rheology data, by analysis of the Cole-Cole plots, the best dispersion was obtained for SEP-SI nanoclay. The thermal stability was not improved, however in the initial stages of the thereto-oxidative degradation a delay in the weight loss was observed for nanocomposites with organomodified sepiolites. The mechanical properties of the nanocomposites were improved in comparison to PCL, particularly for those with modified sepiolites. In terms of mechanical properties the use of sepiolite modified with HDA gave the best results, as a consequence of better interaction between longer alkyl hydrophobic part of the organic modificator and the hydrophobic PCL matrix.
T2  - European Polymer Journal
T1  - Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites
VL  - 97
SP  - 198
EP  - 209
DO  - 10.1016/j.eurpolymj.2017.10.010
ER  - 

@article{
author = "Nikolić, Marija S. and Petrović, Rada and Veljović, Đorđe N. and Ćosović, Vladan and Stanković, Nadežda and Đonlagić, Jasna A.",
year = "2017",
abstract = "Poly(epsilon-caprolactone) (PCL) based nanocomposites with unmodified and organomodified sepiolites were prepared by solution casting method. The sepiolites were modified with short (3-mercaptopropyl)trimethoxysilane (SEP-SI) by using covalent grafting or with long hexadecylamine (SEP-HDA) by using ionic exchange. In order to reveal the influence of the organomodification on the nanoclay dispersion and the properties of the nano composites XRD, DSC, TG, SEM, TEM, optical microscopy, melt rheology and dynamic-mechanical analyses were performed. A better dispersion was achieved when organomodified sepiolites instead of native ones were used as fillers. As deduced from the melt rheology data, by analysis of the Cole-Cole plots, the best dispersion was obtained for SEP-SI nanoclay. The thermal stability was not improved, however in the initial stages of the thereto-oxidative degradation a delay in the weight loss was observed for nanocomposites with organomodified sepiolites. The mechanical properties of the nanocomposites were improved in comparison to PCL, particularly for those with modified sepiolites. In terms of mechanical properties the use of sepiolite modified with HDA gave the best results, as a consequence of better interaction between longer alkyl hydrophobic part of the organic modificator and the hydrophobic PCL matrix.",
journal = "European Polymer Journal",
title = "Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites",
volume = "97",
pages = "198-209",
doi = "10.1016/j.eurpolymj.2017.10.010"
}

Nikolić, M. S., Petrović, R., Veljović, Đ. N., Ćosović, V., Stanković, N.,& Đonlagić, J. A.. (2017). Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites. in European Polymer Journal, 97, 198-209.
https://doi.org/10.1016/j.eurpolymj.2017.10.010

Nikolić MS, Petrović R, Veljović ĐN, Ćosović V, Stanković N, Đonlagić JA. Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites. in European Polymer Journal. 2017;97:198-209.
doi:10.1016/j.eurpolymj.2017.10.010 .

Nikolić, Marija S., Petrović, Rada, Veljović, Đorđe N., Ćosović, Vladan, Stanković, Nadežda, Đonlagić, Jasna A., "Effect of sepiolite organomodification on the performance of PCL/sepiolite nanocomposites" in European Polymer Journal, 97 (2017):198-209,
https://doi.org/10.1016/j.eurpolymj.2017.10.010 . .

TY  - JOUR
AU  - Prekajski, Marija D.
AU  - Jokić, Bojan M.
AU  - Kalijadis, Ana
AU  - Maletaškić, Jelena
AU  - Stanković, Nadežda
AU  - Luković, Jelena M.
AU  - Matović, Branko
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1328
AB  - Nanoemulsion technique, based on Ouzo effect, was applied for synthesis of the pure and silver doped (2.5 and 5 mol%) calcium hydroxyapatite (HAp). After calcination at 500 degrees C fully crystallized powders were obtained. X-ray powder diffraction analysis accompanied with Rietveld refinement revealed that the synthesized powders were single-phase hydroxyapatite. Raman spectroscopy also confirmed that the synthesized powders were single-phase. The obtained HAp particles were spherical in shape and their sizes were in the nanometer range which was revealed by field emission scanning electron microscopy analysis (FESEM). The successful synthesis of the single-phase Ag doped HAp showed that nanoemulsion method is a simple technique for obtaining pure and doped hydroxyapatite nanospheres.
T2  - Processing and Application of Ceramics
T1  - Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect
VL  - 10
IS  - 3
SP  - 169
EP  - 174
DO  - 10.2298/PAC1603169P
ER  - 

@article{
author = "Prekajski, Marija D. and Jokić, Bojan M. and Kalijadis, Ana and Maletaškić, Jelena and Stanković, Nadežda and Luković, Jelena M. and Matović, Branko",
year = "2016",
abstract = "Nanoemulsion technique, based on Ouzo effect, was applied for synthesis of the pure and silver doped (2.5 and 5 mol%) calcium hydroxyapatite (HAp). After calcination at 500 degrees C fully crystallized powders were obtained. X-ray powder diffraction analysis accompanied with Rietveld refinement revealed that the synthesized powders were single-phase hydroxyapatite. Raman spectroscopy also confirmed that the synthesized powders were single-phase. The obtained HAp particles were spherical in shape and their sizes were in the nanometer range which was revealed by field emission scanning electron microscopy analysis (FESEM). The successful synthesis of the single-phase Ag doped HAp showed that nanoemulsion method is a simple technique for obtaining pure and doped hydroxyapatite nanospheres.",
journal = "Processing and Application of Ceramics",
title = "Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect",
volume = "10",
number = "3",
pages = "169-174",
doi = "10.2298/PAC1603169P"
}

Prekajski, M. D., Jokić, B. M., Kalijadis, A., Maletaškić, J., Stanković, N., Luković, J. M.,& Matović, B.. (2016). Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect. in Processing and Application of Ceramics, 10(3), 169-174.
https://doi.org/10.2298/PAC1603169P

Prekajski MD, Jokić BM, Kalijadis A, Maletaškić J, Stanković N, Luković JM, Matović B. Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect. in Processing and Application of Ceramics. 2016;10(3):169-174.
doi:10.2298/PAC1603169P .

Prekajski, Marija D., Jokić, Bojan M., Kalijadis, Ana, Maletaškić, Jelena, Stanković, Nadežda, Luković, Jelena M., Matović, Branko, "Synthesis of silver doped hydroxyapatite nanospheres using Ouzo effect" in Processing and Application of Ceramics, 10, no. 3 (2016):169-174,
https://doi.org/10.2298/PAC1603169P . .

TY  - JOUR
AU  - Matović, Branko
AU  - Luković, Jelena M.
AU  - Nikolić, Marko
AU  - Babić, Biljana M.
AU  - Stanković, Nadežda
AU  - Jokić, Bojan M.
AU  - Jelenković, Branislav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1260
AB  - Nanocrystalline hexagonal boron nitride powders (h-BN) were synthesized from urea and boric acid followed by pirolysis and subsequent heat treatment in nitrogen atmosphere. Materials have been analyzed by means of X-ray diffraction, Photoluminescence and Field emission electron microscopy methods. Obtained results show that starting h-BN powder, synthesized at 750 degrees C, is composed of similar to 11 layer crystallites with average crystallite thickness and crystallite lateral size of 3.94 and 10.4 nm, respectively. A broad emission and intense luminescence intensity were observed due to the large atomic disorder. Higher annealing temperature increases crystallite size and turbostratic h-BN transforms to well crystallized h-BN at 1500 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis and characterization of nanocrystaline hexagonal boron nitride powders: XRD and luminescence properties
VL  - 42
IS  - 15
SP  - 16655
EP  - 16658
DO  - 10.1016/j.ceramint.2016.07.096
ER  - 

@article{
author = "Matović, Branko and Luković, Jelena M. and Nikolić, Marko and Babić, Biljana M. and Stanković, Nadežda and Jokić, Bojan M. and Jelenković, Branislav",
year = "2016",
abstract = "Nanocrystalline hexagonal boron nitride powders (h-BN) were synthesized from urea and boric acid followed by pirolysis and subsequent heat treatment in nitrogen atmosphere. Materials have been analyzed by means of X-ray diffraction, Photoluminescence and Field emission electron microscopy methods. Obtained results show that starting h-BN powder, synthesized at 750 degrees C, is composed of similar to 11 layer crystallites with average crystallite thickness and crystallite lateral size of 3.94 and 10.4 nm, respectively. A broad emission and intense luminescence intensity were observed due to the large atomic disorder. Higher annealing temperature increases crystallite size and turbostratic h-BN transforms to well crystallized h-BN at 1500 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis and characterization of nanocrystaline hexagonal boron nitride powders: XRD and luminescence properties",
volume = "42",
number = "15",
pages = "16655-16658",
doi = "10.1016/j.ceramint.2016.07.096"
}

Matović, B., Luković, J. M., Nikolić, M., Babić, B. M., Stanković, N., Jokić, B. M.,& Jelenković, B.. (2016). Synthesis and characterization of nanocrystaline hexagonal boron nitride powders: XRD and luminescence properties. in Ceramics International, 42(15), 16655-16658.
https://doi.org/10.1016/j.ceramint.2016.07.096

Matović B, Luković JM, Nikolić M, Babić BM, Stanković N, Jokić BM, Jelenković B. Synthesis and characterization of nanocrystaline hexagonal boron nitride powders: XRD and luminescence properties. in Ceramics International. 2016;42(15):16655-16658.
doi:10.1016/j.ceramint.2016.07.096 .

Matović, Branko, Luković, Jelena M., Nikolić, Marko, Babić, Biljana M., Stanković, Nadežda, Jokić, Bojan M., Jelenković, Branislav, "Synthesis and characterization of nanocrystaline hexagonal boron nitride powders: XRD and luminescence properties" in Ceramics International, 42, no. 15 (2016):16655-16658,
https://doi.org/10.1016/j.ceramint.2016.07.096 . .

TY  - JOUR
AU  - Matović, Branko
AU  - Bučevac, Dušan
AU  - Urbanović, Vladimir
AU  - Stanković, Nadežda
AU  - Daneu, Nina
AU  - Volkov-Husović, Tatjana
AU  - Babić, Biljana M.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1134
AB  - Additive-free beta-SiC nanopowders were densified by using high-pressure anvil-type with hollows apparatus at the pressure of 4 GPa in the range of 1500-1900 degrees C. The starting powder with average particle size of 10 nm was synthesized by a sol-gel process. Crystallite size and lattice parameters of the samples have been studied at room temperature by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the size of the crystallites gradually increases from 16 to 51 nm with increasing sintering temperature (1500 to 1900 degrees C). Fully densified sample ( GT 99%) was obtained at a sintering temperature of 1900 degrees C for 60 s. This sample exhibits nano-hardness and Youngs modulus of elasticity of 35 GPa and 450 GPa, respectively. Modified vibratory cavitation test method was used for laboratory testing of the cavitation resistance. A very low erosion level with mass loss 0.1% after 10 h was exhibited during the cavitation test. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Journal of the European Ceramic Society
T1  - Monolithic nanocrystalline SiC ceramics
VL  - 36
IS  - 12
SP  - 3005
EP  - 3010
DO  - 10.1016/j.jeurceramsoc.2015.10.031
ER  - 

@article{
author = "Matović, Branko and Bučevac, Dušan and Urbanović, Vladimir and Stanković, Nadežda and Daneu, Nina and Volkov-Husović, Tatjana and Babić, Biljana M.",
year = "2016",
abstract = "Additive-free beta-SiC nanopowders were densified by using high-pressure anvil-type with hollows apparatus at the pressure of 4 GPa in the range of 1500-1900 degrees C. The starting powder with average particle size of 10 nm was synthesized by a sol-gel process. Crystallite size and lattice parameters of the samples have been studied at room temperature by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that the size of the crystallites gradually increases from 16 to 51 nm with increasing sintering temperature (1500 to 1900 degrees C). Fully densified sample ( GT 99%) was obtained at a sintering temperature of 1900 degrees C for 60 s. This sample exhibits nano-hardness and Youngs modulus of elasticity of 35 GPa and 450 GPa, respectively. Modified vibratory cavitation test method was used for laboratory testing of the cavitation resistance. A very low erosion level with mass loss 0.1% after 10 h was exhibited during the cavitation test. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Journal of the European Ceramic Society",
title = "Monolithic nanocrystalline SiC ceramics",
volume = "36",
number = "12",
pages = "3005-3010",
doi = "10.1016/j.jeurceramsoc.2015.10.031"
}

Matović, B., Bučevac, D., Urbanović, V., Stanković, N., Daneu, N., Volkov-Husović, T.,& Babić, B. M.. (2016). Monolithic nanocrystalline SiC ceramics. in Journal of the European Ceramic Society, 36(12), 3005-3010.
https://doi.org/10.1016/j.jeurceramsoc.2015.10.031

Matović B, Bučevac D, Urbanović V, Stanković N, Daneu N, Volkov-Husović T, Babić BM. Monolithic nanocrystalline SiC ceramics. in Journal of the European Ceramic Society. 2016;36(12):3005-3010.
doi:10.1016/j.jeurceramsoc.2015.10.031 .

Matović, Branko, Bučevac, Dušan, Urbanović, Vladimir, Stanković, Nadežda, Daneu, Nina, Volkov-Husović, Tatjana, Babić, Biljana M., "Monolithic nanocrystalline SiC ceramics" in Journal of the European Ceramic Society, 36, no. 12 (2016):3005-3010,
https://doi.org/10.1016/j.jeurceramsoc.2015.10.031 . .

TY  - JOUR
AU  - Pantić, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Došen, Anja M.
AU  - Prekajski, Marija D.
AU  - Stanković, Nadežda
AU  - Baščarević, Zvezdana D.
AU  - Matović, Branko
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5325
AB  - Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibromilling for homogenization and activation of precursors. The mechanochemical process initially yielded amorphous powders, which on further calcination, crystallized to yield sphene ceramic. The evolution of the phase composition with thermal treatment was investigated by X-ray powder diffraction (XRPD). Powder morphology and particle size distribution were analyzed by scanning electron microscopy (SEM) and laser diffraction, respectively. Rietveld refinement was employed to get the structural information of the synthesized powder. Densification and microstructure evolution was determined by means of density and scanning electron microscopy (SEM). The most favorable conditions for mechanical activation and synthesis of sphene based ceramic material are reported. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Influence of mechanical activation on sphene based ceramic material synthesis
VL  - 39
IS  - 1
SP  - 483
EP  - 488
DO  - 10.1016/j.ceramint.2012.06.052
ER  - 

@article{
author = "Pantić, Jelena R. and Kremenović, Aleksandar S. and Došen, Anja M. and Prekajski, Marija D. and Stanković, Nadežda and Baščarević, Zvezdana D. and Matović, Branko",
year = "2013",
abstract = "Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibromilling for homogenization and activation of precursors. The mechanochemical process initially yielded amorphous powders, which on further calcination, crystallized to yield sphene ceramic. The evolution of the phase composition with thermal treatment was investigated by X-ray powder diffraction (XRPD). Powder morphology and particle size distribution were analyzed by scanning electron microscopy (SEM) and laser diffraction, respectively. Rietveld refinement was employed to get the structural information of the synthesized powder. Densification and microstructure evolution was determined by means of density and scanning electron microscopy (SEM). The most favorable conditions for mechanical activation and synthesis of sphene based ceramic material are reported. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Influence of mechanical activation on sphene based ceramic material synthesis",
volume = "39",
number = "1",
pages = "483-488",
doi = "10.1016/j.ceramint.2012.06.052"
}

Pantić, J. R., Kremenović, A. S., Došen, A. M., Prekajski, M. D., Stanković, N., Baščarević, Z. D.,& Matović, B.. (2013). Influence of mechanical activation on sphene based ceramic material synthesis. in Ceramics International, 39(1), 483-488.
https://doi.org/10.1016/j.ceramint.2012.06.052

Pantić JR, Kremenović AS, Došen AM, Prekajski MD, Stanković N, Baščarević ZD, Matović B. Influence of mechanical activation on sphene based ceramic material synthesis. in Ceramics International. 2013;39(1):483-488.
doi:10.1016/j.ceramint.2012.06.052 .

Pantić, Jelena R., Kremenović, Aleksandar S., Došen, Anja M., Prekajski, Marija D., Stanković, Nadežda, Baščarević, Zvezdana D., Matović, Branko, "Influence of mechanical activation on sphene based ceramic material synthesis" in Ceramics International, 39, no. 1 (2013):483-488,
https://doi.org/10.1016/j.ceramint.2012.06.052 . .