TY  - JOUR
AU  - Stojanovic, Dusica
AU  - Brajović, Ljiljana
AU  - Obradovic, Vera
AU  - Mijailovic, Daniel
AU  - Dramlic, Dragan
AU  - Kojovic, Aleksandar
AU  - Uskokovic, Petar
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1946
AB  - The composite nanofibers were used as reinforcement in acrylic polymer for the overall enhancement of thermomechanical
properties, adhesion between fibers and matrix, and fracture toughness of the final nanocomposite
since acrylic materials lack of this feature. So, a good balance between hardness/toughness and transparency is
obtained with the addition of poly (vinyl butyral) (PVB) and titania (TiO2) nanofibers simultaneously and
controlling their contents. Specifically, when compared to that of pure acrylic polymer, the fracture toughness of
the PMMA nanocomposite apparently increased 55 % with the addition of 3 wt.% titania nanoparticles, while
the produced nanocomposite maintained high transmittance above 75–80% in the visible domain. The transmission
spectrum modelling of the reinforced fiber materials and hybrid acrylic composites using Mie scattering
theory for different particle sizes and particle content is presented. The calculated transmission coefficients
versus wavelength are compared with the experimental ones.
PB  - Elsevier
T2  - Progress in Organic Coatings
T1  - Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance
SP  - 105437
VL  - 139
VL  - 139
DO  - 10.1016/j.porgcoat.2019.105437
ER  - 

@article{
author = "Stojanovic, Dusica and Brajović, Ljiljana and Obradovic, Vera and Mijailovic, Daniel and Dramlic, Dragan and Kojovic, Aleksandar and Uskokovic, Petar",
year = "2020",
abstract = "The composite nanofibers were used as reinforcement in acrylic polymer for the overall enhancement of thermomechanical
properties, adhesion between fibers and matrix, and fracture toughness of the final nanocomposite
since acrylic materials lack of this feature. So, a good balance between hardness/toughness and transparency is
obtained with the addition of poly (vinyl butyral) (PVB) and titania (TiO2) nanofibers simultaneously and
controlling their contents. Specifically, when compared to that of pure acrylic polymer, the fracture toughness of
the PMMA nanocomposite apparently increased 55 % with the addition of 3 wt.% titania nanoparticles, while
the produced nanocomposite maintained high transmittance above 75–80% in the visible domain. The transmission
spectrum modelling of the reinforced fiber materials and hybrid acrylic composites using Mie scattering
theory for different particle sizes and particle content is presented. The calculated transmission coefficients
versus wavelength are compared with the experimental ones.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance",
pages = "105437",
volume = "139, 139",
doi = "10.1016/j.porgcoat.2019.105437"
}

Stojanovic, D., Brajović, L., Obradovic, V., Mijailovic, D., Dramlic, D., Kojovic, A.,& Uskokovic, P.. (2020). Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance. in Progress in Organic Coatings
Elsevier., 139, 105437.
https://doi.org/10.1016/j.porgcoat.2019.105437

Stojanovic D, Brajović L, Obradovic V, Mijailovic D, Dramlic D, Kojovic A, Uskokovic P. Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance. in Progress in Organic Coatings. 2020;139:105437.
doi:10.1016/j.porgcoat.2019.105437 .

Stojanovic, Dusica, Brajović, Ljiljana, Obradovic, Vera, Mijailovic, Daniel, Dramlic, Dragan, Kojovic, Aleksandar, Uskokovic, Petar, "Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance" in Progress in Organic Coatings, 139 (2020):105437,
https://doi.org/10.1016/j.porgcoat.2019.105437 . .

TY  - CONF
AU  - Jelić, Ivana
AU  - Bosnjakovic, Jovana
AU  - Kostić, Aleksandar
AU  - Sljivic-Ivanovic, Marija
AU  - Dimovic, Slavko
AU  - Savić, Aleksandar R.
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2021
AB  - The aim of this article is to review the utilization of various types of waste in geopolimerization
technology processes. The geopolymerization represents a process comprising of the dissolution of aluminosilicate solids in a strongly alkaline medium followed by condensation of free alumina-silica oligomers to form a tetrahedral polymeric structure. Advantage of this technology represents the possibility of utilization of any silica and alumina-containing waste material that could be dissolved in an alkaline solution. Production of geopolymers from waste not only provides less raw material consumption but also addresses issues regarding the disposal of wastes. Fly ash, red mud, construction and demolition waste (C&DW), slags, or mine waste are the most utilized waste types in combination with supplementary waste materials according to their characteristics. Conducted investigations showed that the use of various waste materials leads to the production of geopolymers with a broad range of final properties. Despite a high number of published Publications and patents, the large-scale utilization of waste is still missing.
PB  - University of Belgrade, Technical Faculty in Bor
C3  - Proceedings of the 51st International October Conference On Mining and Metallurgy
T1  - Utilization of Waste In Geopolimerization A Review
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2021
ER  - 

@conference{
author = "Jelić, Ivana and Bosnjakovic, Jovana and Kostić, Aleksandar and Sljivic-Ivanovic, Marija and Dimovic, Slavko and Savić, Aleksandar R.",
year = "2019",
abstract = "The aim of this article is to review the utilization of various types of waste in geopolimerization
technology processes. The geopolymerization represents a process comprising of the dissolution of aluminosilicate solids in a strongly alkaline medium followed by condensation of free alumina-silica oligomers to form a tetrahedral polymeric structure. Advantage of this technology represents the possibility of utilization of any silica and alumina-containing waste material that could be dissolved in an alkaline solution. Production of geopolymers from waste not only provides less raw material consumption but also addresses issues regarding the disposal of wastes. Fly ash, red mud, construction and demolition waste (C&DW), slags, or mine waste are the most utilized waste types in combination with supplementary waste materials according to their characteristics. Conducted investigations showed that the use of various waste materials leads to the production of geopolymers with a broad range of final properties. Despite a high number of published Publications and patents, the large-scale utilization of waste is still missing.",
publisher = "University of Belgrade, Technical Faculty in Bor",
journal = "Proceedings of the 51st International October Conference On Mining and Metallurgy",
title = "Utilization of Waste In Geopolimerization A Review",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2021"
}

Jelić, I., Bosnjakovic, J., Kostić, A., Sljivic-Ivanovic, M., Dimovic, S.,& Savić, A. R.. (2019). Utilization of Waste In Geopolimerization A Review. in Proceedings of the 51st International October Conference On Mining and Metallurgy
University of Belgrade, Technical Faculty in Bor..
https://hdl.handle.net/21.15107/rcub_grafar_2021

Jelić I, Bosnjakovic J, Kostić A, Sljivic-Ivanovic M, Dimovic S, Savić AR. Utilization of Waste In Geopolimerization A Review. in Proceedings of the 51st International October Conference On Mining and Metallurgy. 2019;.
https://hdl.handle.net/21.15107/rcub_grafar_2021 .

Jelić, Ivana, Bosnjakovic, Jovana, Kostić, Aleksandar, Sljivic-Ivanovic, Marija, Dimovic, Slavko, Savić, Aleksandar R., "Utilization of Waste In Geopolimerization A Review" in Proceedings of the 51st International October Conference On Mining and Metallurgy (2019),
https://hdl.handle.net/21.15107/rcub_grafar_2021 .

TY  - JOUR
AU  - Brajović, Ljiljana
AU  - Stojanović, Dušica B.
AU  - Mihailović, Pedja
AU  - Marković, Smilja
AU  - Romcević, Maja
AU  - Mitrić, Miodrag N.
AU  - Lazović, Vladimir
AU  - Dramlić, Dragan
AU  - Petricević, Slobodan
AU  - Romcević, Nebojsa
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/853
AB  - Bismuth germanium oxide Bi12GeO20 (BGO) has very interesting electrical, optical and magnetic properties. In order to make devices based on this material more flexible, its powder was used for preparing polymer composites. This study reports investigation of the effects of using different solvents and polymers in preparation of BGO composite on the microstructural and optical behaviour of the resulting material. Preparation of such composites by a solution casting method is described. Poly (methyl methacrylate) (PMMA) and polystyrene (PS)) were used as matrix materials and acetone and chloroform as solvents. Their microstructure and the quality of BGO dispersion and deaggregation in polymer matrix were analyzed by SEM, Raman, XRD and optical spectroscopy. The influence of particle size distribution, their shapes, and concentration on the optical transmission is calculated based on Mie scattering theory and discussed, too.
PB  - Elsevier Ltd
T2  - Journal of Alloys and Compounds
T1  - Preparation and characterization of bismuth germanium oxide (BGO) polymer composites
EP  - 849
SP  - 841
VL  - 695
DO  - 10.1016/j.jallcom.2016.10.140
ER  - 

@article{
author = "Brajović, Ljiljana and Stojanović, Dušica B. and Mihailović, Pedja and Marković, Smilja and Romcević, Maja and Mitrić, Miodrag N. and Lazović, Vladimir and Dramlić, Dragan and Petricević, Slobodan and Romcević, Nebojsa",
year = "2017",
abstract = "Bismuth germanium oxide Bi12GeO20 (BGO) has very interesting electrical, optical and magnetic properties. In order to make devices based on this material more flexible, its powder was used for preparing polymer composites. This study reports investigation of the effects of using different solvents and polymers in preparation of BGO composite on the microstructural and optical behaviour of the resulting material. Preparation of such composites by a solution casting method is described. Poly (methyl methacrylate) (PMMA) and polystyrene (PS)) were used as matrix materials and acetone and chloroform as solvents. Their microstructure and the quality of BGO dispersion and deaggregation in polymer matrix were analyzed by SEM, Raman, XRD and optical spectroscopy. The influence of particle size distribution, their shapes, and concentration on the optical transmission is calculated based on Mie scattering theory and discussed, too.",
publisher = "Elsevier Ltd",
journal = "Journal of Alloys and Compounds",
title = "Preparation and characterization of bismuth germanium oxide (BGO) polymer composites",
pages = "849-841",
volume = "695",
doi = "10.1016/j.jallcom.2016.10.140"
}

Brajović, L., Stojanović, D. B., Mihailović, P., Marković, S., Romcević, M., Mitrić, M. N., Lazović, V., Dramlić, D., Petricević, S.,& Romcević, N.. (2017). Preparation and characterization of bismuth germanium oxide (BGO) polymer composites. in Journal of Alloys and Compounds
Elsevier Ltd., 695, 841-849.
https://doi.org/10.1016/j.jallcom.2016.10.140

Brajović L, Stojanović DB, Mihailović P, Marković S, Romcević M, Mitrić MN, Lazović V, Dramlić D, Petricević S, Romcević N. Preparation and characterization of bismuth germanium oxide (BGO) polymer composites. in Journal of Alloys and Compounds. 2017;695:841-849.
doi:10.1016/j.jallcom.2016.10.140 .

Brajović, Ljiljana, Stojanović, Dušica B., Mihailović, Pedja, Marković, Smilja, Romcević, Maja, Mitrić, Miodrag N., Lazović, Vladimir, Dramlić, Dragan, Petricević, Slobodan, Romcević, Nebojsa, "Preparation and characterization of bismuth germanium oxide (BGO) polymer composites" in Journal of Alloys and Compounds, 695 (2017):841-849,
https://doi.org/10.1016/j.jallcom.2016.10.140 . .

TY  - JOUR
AU  - Petrović, Miloš
AU  - Mihailović, Pedja
AU  - Brajović, Ljiljana
AU  - Petricević, Slobodan
AU  - Živković, Irena
AU  - Kojović, Aleksandar
AU  - Radojević, Vesna
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/796
AB  - In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.
PB  - Institute of Electrical and Electronics Engineers Inc.
T2  - Ieee Sensors Journal
T1  - Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester
EP  - 3053
IS  - 9
SP  - 3047
VL  - 16
DO  - 10.1109/JSEN.2016.2524045
ER  - 

@article{
author = "Petrović, Miloš and Mihailović, Pedja and Brajović, Ljiljana and Petricević, Slobodan and Živković, Irena and Kojović, Aleksandar and Radojević, Vesna",
year = "2016",
abstract = "In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
journal = "Ieee Sensors Journal",
title = "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester",
pages = "3053-3047",
number = "9",
volume = "16",
doi = "10.1109/JSEN.2016.2524045"
}

Petrović, M., Mihailović, P., Brajović, L., Petricević, S., Živković, I., Kojović, A.,& Radojević, V.. (2016). Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in Ieee Sensors Journal
Institute of Electrical and Electronics Engineers Inc.., 16(9), 3047-3053.
https://doi.org/10.1109/JSEN.2016.2524045

Petrović M, Mihailović P, Brajović L, Petricević S, Živković I, Kojović A, Radojević V. Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in Ieee Sensors Journal. 2016;16(9):3047-3053.
doi:10.1109/JSEN.2016.2524045 .

Petrović, Miloš, Mihailović, Pedja, Brajović, Ljiljana, Petricević, Slobodan, Živković, Irena, Kojović, Aleksandar, Radojević, Vesna, "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester" in Ieee Sensors Journal, 16, no. 9 (2016):3047-3053,
https://doi.org/10.1109/JSEN.2016.2524045 . .

TY  - JOUR
AU  - El Swie, H.
AU  - Radojević, Vesna
AU  - Brajović, Ljiljana
AU  - Stajic-Trosić, J.
AU  - Cosović, V.
AU  - Grujić, A.
AU  - Aleksić, Radoslav
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/706
AB  - The commercial multi-mode optical fiber was coated with magnetic composite material prepared using Nd-Fe-B permanent magnet powder dispersed in poly (ethylene-co-vinyl acetate)-EVA. Characterization of microstructure, thermal stability and mechanical properties of the composite coatings with different Nd-Fe-B powder content were performed using Scanning Electron Microscope (SEM), Differential Scanning Calorimetry (DSC), and standard tensile tester, respectively. Experimental results show that composites with higher content of Nd-Fe-B powder have improved thermal and mechanical properties. Propagation characteristics of the constructed optical fiber magnetic sensing element (OFMSE) in the external magnetic field were investigated in relation to quality and composition of the applied composite coatings. The attenuation of optical signal with applied external magnetic field intensity was monitored and the results suggest that the sample with 50 wt-% of Nd-Fe-B provides the greatest sensitivity of the sensor element.
T2  - Digest Journal of Nanomaterials and Biostructures
T1  - Synthesis and performance of polymer based magnetic composite sensing element
EP  - 1483
IS  - 4
SP  - 1475
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_grafar_706
ER  - 

@article{
author = "El Swie, H. and Radojević, Vesna and Brajović, Ljiljana and Stajic-Trosić, J. and Cosović, V. and Grujić, A. and Aleksić, Radoslav",
year = "2015",
abstract = "The commercial multi-mode optical fiber was coated with magnetic composite material prepared using Nd-Fe-B permanent magnet powder dispersed in poly (ethylene-co-vinyl acetate)-EVA. Characterization of microstructure, thermal stability and mechanical properties of the composite coatings with different Nd-Fe-B powder content were performed using Scanning Electron Microscope (SEM), Differential Scanning Calorimetry (DSC), and standard tensile tester, respectively. Experimental results show that composites with higher content of Nd-Fe-B powder have improved thermal and mechanical properties. Propagation characteristics of the constructed optical fiber magnetic sensing element (OFMSE) in the external magnetic field were investigated in relation to quality and composition of the applied composite coatings. The attenuation of optical signal with applied external magnetic field intensity was monitored and the results suggest that the sample with 50 wt-% of Nd-Fe-B provides the greatest sensitivity of the sensor element.",
journal = "Digest Journal of Nanomaterials and Biostructures",
title = "Synthesis and performance of polymer based magnetic composite sensing element",
pages = "1483-1475",
number = "4",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_grafar_706"
}

El Swie, H., Radojević, V., Brajović, L., Stajic-Trosić, J., Cosović, V., Grujić, A.,& Aleksić, R.. (2015). Synthesis and performance of polymer based magnetic composite sensing element. in Digest Journal of Nanomaterials and Biostructures, 10(4), 1475-1483.
https://hdl.handle.net/21.15107/rcub_grafar_706

El Swie H, Radojević V, Brajović L, Stajic-Trosić J, Cosović V, Grujić A, Aleksić R. Synthesis and performance of polymer based magnetic composite sensing element. in Digest Journal of Nanomaterials and Biostructures. 2015;10(4):1475-1483.
https://hdl.handle.net/21.15107/rcub_grafar_706 .

El Swie, H., Radojević, Vesna, Brajović, Ljiljana, Stajic-Trosić, J., Cosović, V., Grujić, A., Aleksić, Radoslav, "Synthesis and performance of polymer based magnetic composite sensing element" in Digest Journal of Nanomaterials and Biostructures, 10, no. 4 (2015):1475-1483,
https://hdl.handle.net/21.15107/rcub_grafar_706 .

TY  - JOUR
AU  - Stojanović, Dušica B.
AU  - Brajović, Ljiljana
AU  - Orlović, Aleksandar
AU  - Dramlić, Dragan
AU  - Radmilović, Velimir
AU  - Uskoković, Petar S.
AU  - Aleksić, Radoslav
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/535
AB  - This work reports the preparation of PMMA/silica nanocomposites with high optical transparency and enhanced mechanical properties using a melt compounding method. The surface of SiO2 particles was modified with a gamma-methacryloxypropyltrimethoxy silane coupling agent in a supercritical carbon dioxide-ethanol mixture and by conventional procedure. Dispersion of silica nanoparticles in ethanol at low temperatures plays an important role in deagglomeration and dispersion of nanosilica, which leads to the optimal particle-matrix bonding in composites. The optimal mechanical and optical properties were found for composites loaded with 5 wt% silica nanoparticles treated under supercritical coating method.
T2  - Progress in Organic Coatings
T1  - Transparent PMMA/silica nanocomposites containing silica nanoparticles coating under supercritical conditions
EP  - 631
IS  - 4
SP  - 626
VL  - 76
DO  - 10.1016/j.porgcoat.2012.12.002
ER  - 

@article{
author = "Stojanović, Dušica B. and Brajović, Ljiljana and Orlović, Aleksandar and Dramlić, Dragan and Radmilović, Velimir and Uskoković, Petar S. and Aleksić, Radoslav",
year = "2013",
abstract = "This work reports the preparation of PMMA/silica nanocomposites with high optical transparency and enhanced mechanical properties using a melt compounding method. The surface of SiO2 particles was modified with a gamma-methacryloxypropyltrimethoxy silane coupling agent in a supercritical carbon dioxide-ethanol mixture and by conventional procedure. Dispersion of silica nanoparticles in ethanol at low temperatures plays an important role in deagglomeration and dispersion of nanosilica, which leads to the optimal particle-matrix bonding in composites. The optimal mechanical and optical properties were found for composites loaded with 5 wt% silica nanoparticles treated under supercritical coating method.",
journal = "Progress in Organic Coatings",
title = "Transparent PMMA/silica nanocomposites containing silica nanoparticles coating under supercritical conditions",
pages = "631-626",
number = "4",
volume = "76",
doi = "10.1016/j.porgcoat.2012.12.002"
}

Stojanović, D. B., Brajović, L., Orlović, A., Dramlić, D., Radmilović, V., Uskoković, P. S.,& Aleksić, R.. (2013). Transparent PMMA/silica nanocomposites containing silica nanoparticles coating under supercritical conditions. in Progress in Organic Coatings, 76(4), 626-631.
https://doi.org/10.1016/j.porgcoat.2012.12.002

Stojanović DB, Brajović L, Orlović A, Dramlić D, Radmilović V, Uskoković PS, Aleksić R. Transparent PMMA/silica nanocomposites containing silica nanoparticles coating under supercritical conditions. in Progress in Organic Coatings. 2013;76(4):626-631.
doi:10.1016/j.porgcoat.2012.12.002 .

Stojanović, Dušica B., Brajović, Ljiljana, Orlović, Aleksandar, Dramlić, Dragan, Radmilović, Velimir, Uskoković, Petar S., Aleksić, Radoslav, "Transparent PMMA/silica nanocomposites containing silica nanoparticles coating under supercritical conditions" in Progress in Organic Coatings, 76, no. 4 (2013):626-631,
https://doi.org/10.1016/j.porgcoat.2012.12.002 . .