TY  - JOUR
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Konstantinovic, Sandra
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6911
AB  - The thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resins with hexamethylenetetramine-HMTA (Resin 1), melamine-M (Resin 2), and ethylene urea (EU, Resin 3) including nano-SiO2 was investigated by non-isothermal thermo-gravimetric analysis (TG), differential thermal gravimetry (DTG), and differential thermal analysis (DTA) supported by data from IR spectroscopy. Possibility of combining inorganic filler in a form of silicon dioxide with UF resins was found investigated and percentage of free formaldehyde was determined. The shift of DTG peaks to a high temperature indicates the increase of thermal stability of modified UF resin with EU (Resin 3) which is confirmed by data obtained from the FTIR study. The minimum percentage (6%) of free formaldehyde was obtained in Resin 3.
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Thermal behavior of modified urea-formaldehyde resins
VL  - 104
IS  - 3
SP  - 1159
EP  - 1166
DO  - 10.1007/s10973-010-1143-8
ER  - 

@article{
author = "Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Konstantinovic, Sandra and Marković, Gordana and Marinović-Cincović, Milena",
year = "2011",
abstract = "The thermal stability of pure urea-formaldehyde resin (PR) and modified urea-formaldehyde (UF) resins with hexamethylenetetramine-HMTA (Resin 1), melamine-M (Resin 2), and ethylene urea (EU, Resin 3) including nano-SiO2 was investigated by non-isothermal thermo-gravimetric analysis (TG), differential thermal gravimetry (DTG), and differential thermal analysis (DTA) supported by data from IR spectroscopy. Possibility of combining inorganic filler in a form of silicon dioxide with UF resins was found investigated and percentage of free formaldehyde was determined. The shift of DTG peaks to a high temperature indicates the increase of thermal stability of modified UF resin with EU (Resin 3) which is confirmed by data obtained from the FTIR study. The minimum percentage (6%) of free formaldehyde was obtained in Resin 3.",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Thermal behavior of modified urea-formaldehyde resins",
volume = "104",
number = "3",
pages = "1159-1166",
doi = "10.1007/s10973-010-1143-8"
}

Samaržija-Jovanović, S., Jovanović, V., Konstantinovic, S., Marković, G.,& Marinović-Cincović, M.. (2011). Thermal behavior of modified urea-formaldehyde resins. in Journal of Thermal Analysis and Calorimetry, 104(3), 1159-1166.
https://doi.org/10.1007/s10973-010-1143-8

Samaržija-Jovanović S, Jovanović V, Konstantinovic S, Marković G, Marinović-Cincović M. Thermal behavior of modified urea-formaldehyde resins. in Journal of Thermal Analysis and Calorimetry. 2011;104(3):1159-1166.
doi:10.1007/s10973-010-1143-8 .

Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Konstantinovic, Sandra, Marković, Gordana, Marinović-Cincović, Milena, "Thermal behavior of modified urea-formaldehyde resins" in Journal of Thermal Analysis and Calorimetry, 104, no. 3 (2011):1159-1166,
https://doi.org/10.1007/s10973-010-1143-8 . .

TY  - JOUR
AU  - Prekajski, Marija D.
AU  - Kremenović, Aleksandar S.
AU  - Babić, Biljana M.
AU  - Rosić, Milena
AU  - Matović, Branko
AU  - Radosavljević-Mihajlović, Ana S.
AU  - Radović, Marko B.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4103
AB  - Nanometric Bi2O3 powder was successfully synthesized by applying the method based on self-propagating room temperature reaction (SPRT) between bismuth nitrates and sodium hydroxide. X-ray powder diffraction (XRPD) and Rietvelds structure refinement method were applied to characterize prepared powder. It revealed that synthesized material is a single phase monoclinic alpha-Bi2O3 (space group P2(1)/c with cell parameters a = 5.84605(4)angstrom, b = 8.16339(6) angstrom, c = 7.50788(6) angstrom and beta = 112.9883(8)). Powder particles were of nanometric size (about 50 nm). Raman spectral studies conformed that the obtained powder is single phase alpha-Bi2O3. Specific surface area of obtained powder was measured by Brunauer-Emmet-Teller (BET) method. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Materials Letters
T1  - Room-temperature synthesis of nanometric alpha-Bi2O3
VL  - 64
IS  - 20
SP  - 2247
EP  - 2250
DO  - 10.1016/j.matlet.2010.06.052
ER  - 

@article{
author = "Prekajski, Marija D. and Kremenović, Aleksandar S. and Babić, Biljana M. and Rosić, Milena and Matović, Branko and Radosavljević-Mihajlović, Ana S. and Radović, Marko B.",
year = "2010",
abstract = "Nanometric Bi2O3 powder was successfully synthesized by applying the method based on self-propagating room temperature reaction (SPRT) between bismuth nitrates and sodium hydroxide. X-ray powder diffraction (XRPD) and Rietvelds structure refinement method were applied to characterize prepared powder. It revealed that synthesized material is a single phase monoclinic alpha-Bi2O3 (space group P2(1)/c with cell parameters a = 5.84605(4)angstrom, b = 8.16339(6) angstrom, c = 7.50788(6) angstrom and beta = 112.9883(8)). Powder particles were of nanometric size (about 50 nm). Raman spectral studies conformed that the obtained powder is single phase alpha-Bi2O3. Specific surface area of obtained powder was measured by Brunauer-Emmet-Teller (BET) method. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Materials Letters",
title = "Room-temperature synthesis of nanometric alpha-Bi2O3",
volume = "64",
number = "20",
pages = "2247-2250",
doi = "10.1016/j.matlet.2010.06.052"
}

Prekajski, M. D., Kremenović, A. S., Babić, B. M., Rosić, M., Matović, B., Radosavljević-Mihajlović, A. S.,& Radović, M. B.. (2010). Room-temperature synthesis of nanometric alpha-Bi2O3. in Materials Letters, 64(20), 2247-2250.
https://doi.org/10.1016/j.matlet.2010.06.052

Prekajski MD, Kremenović AS, Babić BM, Rosić M, Matović B, Radosavljević-Mihajlović AS, Radović MB. Room-temperature synthesis of nanometric alpha-Bi2O3. in Materials Letters. 2010;64(20):2247-2250.
doi:10.1016/j.matlet.2010.06.052 .

Prekajski, Marija D., Kremenović, Aleksandar S., Babić, Biljana M., Rosić, Milena, Matović, Branko, Radosavljević-Mihajlović, Ana S., Radović, Marko B., "Room-temperature synthesis of nanometric alpha-Bi2O3" in Materials Letters, 64, no. 20 (2010):2247-2250,
https://doi.org/10.1016/j.matlet.2010.06.052 . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Bobić, Ilija
AU  - Jovanović, Milan T.
AU  - Babić, Miroslav
AU  - Mitovic, Slobodan
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3572
AB  - In the present study, the effect of the Al2O3 particles (average size of 12 mu m, 3 and 10 wt.%) reinforcement on the microstructure and tribological properties of Al-Si alloy (A356) was investigated. Composites were produced by applying compocasting process. Tribological properties of unreinforced alloy and composites were studied, using pin-on-disc tribometer, under dry sliding conditions at different specific loads and sliding speed of 1 m/s. Microhardness measurements, optical microscope and scanning electron microscope were used for microstructural characterization and investigation of worn surfaces and wear debris. During compocasting of A356 alloy, a transformation from a typical dendritic primary alpha phase to a non-dendritic rosette-like structure occurred. Composites exhibited better wear resistance compared with unreinforced alloy. Presence of 3 wt.% Al2O3 particles in the composite material affected the wear resistance only at specific loads up to 1 MPa. The wear rate of composite with 10 wt.% Al2O3 particles was nearly two order of the magnitude lower than the wear rate of the matrix alloy. Dominant wear mechanism for all materials was adhesion, with others mechanisms: oxidation, abrasion and delamination as minor ones.
T2  - Tribology Letters
T1  - Microstructural and Tribological Properties of A356 Al-Si Alloy Reinforced with Al2O3 Particles
VL  - 32
IS  - 3
SP  - 159
EP  - 170
DO  - 10.1007/s11249-008-9374-6
ER  - 

@article{
author = "Vencl, Aleksandar and Bobić, Ilija and Jovanović, Milan T. and Babić, Miroslav and Mitovic, Slobodan",
year = "2008",
abstract = "In the present study, the effect of the Al2O3 particles (average size of 12 mu m, 3 and 10 wt.%) reinforcement on the microstructure and tribological properties of Al-Si alloy (A356) was investigated. Composites were produced by applying compocasting process. Tribological properties of unreinforced alloy and composites were studied, using pin-on-disc tribometer, under dry sliding conditions at different specific loads and sliding speed of 1 m/s. Microhardness measurements, optical microscope and scanning electron microscope were used for microstructural characterization and investigation of worn surfaces and wear debris. During compocasting of A356 alloy, a transformation from a typical dendritic primary alpha phase to a non-dendritic rosette-like structure occurred. Composites exhibited better wear resistance compared with unreinforced alloy. Presence of 3 wt.% Al2O3 particles in the composite material affected the wear resistance only at specific loads up to 1 MPa. The wear rate of composite with 10 wt.% Al2O3 particles was nearly two order of the magnitude lower than the wear rate of the matrix alloy. Dominant wear mechanism for all materials was adhesion, with others mechanisms: oxidation, abrasion and delamination as minor ones.",
journal = "Tribology Letters",
title = "Microstructural and Tribological Properties of A356 Al-Si Alloy Reinforced with Al2O3 Particles",
volume = "32",
number = "3",
pages = "159-170",
doi = "10.1007/s11249-008-9374-6"
}

Vencl, A., Bobić, I., Jovanović, M. T., Babić, M.,& Mitovic, S.. (2008). Microstructural and Tribological Properties of A356 Al-Si Alloy Reinforced with Al2O3 Particles. in Tribology Letters, 32(3), 159-170.
https://doi.org/10.1007/s11249-008-9374-6

Vencl A, Bobić I, Jovanović MT, Babić M, Mitovic S. Microstructural and Tribological Properties of A356 Al-Si Alloy Reinforced with Al2O3 Particles. in Tribology Letters. 2008;32(3):159-170.
doi:10.1007/s11249-008-9374-6 .

Vencl, Aleksandar, Bobić, Ilija, Jovanović, Milan T., Babić, Miroslav, Mitovic, Slobodan, "Microstructural and Tribological Properties of A356 Al-Si Alloy Reinforced with Al2O3 Particles" in Tribology Letters, 32, no. 3 (2008):159-170,
https://doi.org/10.1007/s11249-008-9374-6 . .

TY  - JOUR
AU  - Bučevac, Dušan
AU  - Bošković, Snežana B.
AU  - Matović, Branko
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3671
AB  - The alpha-beta phase transformation in Si3N4 was studied for seeded samples using all Y2O3-Al2O3 mixture as a sintering aid. The concentration of beta-seeds varied from 0 to 5 wt.%. The results showed that alpha-beta phase transformation followed the first-order reaction. The calculated activation energy for seeded samples was in the range from 348 to 3 78 KJ/mol, indicating boundary reaction as the rate limiting step.
T2  - Science of Sintering
T1  - Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics
VL  - 40
IS  - 3
SP  - 263
EP  - 270
DO  - 10.2298/SOS0803263B
ER  - 

@article{
author = "Bučevac, Dušan and Bošković, Snežana B. and Matović, Branko",
year = "2008",
abstract = "The alpha-beta phase transformation in Si3N4 was studied for seeded samples using all Y2O3-Al2O3 mixture as a sintering aid. The concentration of beta-seeds varied from 0 to 5 wt.%. The results showed that alpha-beta phase transformation followed the first-order reaction. The calculated activation energy for seeded samples was in the range from 348 to 3 78 KJ/mol, indicating boundary reaction as the rate limiting step.",
journal = "Science of Sintering",
title = "Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics",
volume = "40",
number = "3",
pages = "263-270",
doi = "10.2298/SOS0803263B"
}

Bučevac, D., Bošković, S. B.,& Matović, B.. (2008). Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics. in Science of Sintering, 40(3), 263-270.
https://doi.org/10.2298/SOS0803263B

Bučevac D, Bošković SB, Matović B. Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics. in Science of Sintering. 2008;40(3):263-270.
doi:10.2298/SOS0803263B .

Bučevac, Dušan, Bošković, Snežana B., Matović, Branko, "Kinetics of the alpha-beta Phase Transformation in Seeded Si3N4 Ceramics" in Science of Sintering, 40, no. 3 (2008):263-270,
https://doi.org/10.2298/SOS0803263B . .

TY  - JOUR
AU  - Jokanović, Vukoman R.
AU  - Jokanovic, B.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3554
AB  - The mechanism of the synthesis of silicon dioxide particles by ultrasonic spraying of a silica sol as a precursor is the subject of this work. The structural design of the obtained particles was defined as an organized structure of basic motives, silica chains forming so] particles, sub-particles and finally up to the particle level. TGA analysis was employed to define the size of the silica chains in the sol particles, The mean particle size obtained by spray pyrolysis was 1.68 mu m, with sub-particles of 25-30 nm. Based on the application of a suitable theoretical model, the mean particle diameter and sub-particle values were calculated as 1.8 mu m and 38.4 rim, respectively. The theoretically and experimentally obtained values are in good agreement, confirming that advanced modeling of the silicon dioxide structure at the particle and sub-particle level is possible. The mean size of a sol particle obtained in the hydrothermal procedure was 7.5 nm and the size of the structural motive of the silica chain consisting of sol particles is built up from 18-20 tetrahedral cells of silicon dioxide.
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Nanodesigning of SiO2 powders obtained from silica sols by ultrasonic spray pyrolysis
VL  - 10
IS  - 10
SP  - 2684
EP  - 2693
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3554
ER  - 

@article{
author = "Jokanović, Vukoman R. and Jokanovic, B.",
year = "2008",
abstract = "The mechanism of the synthesis of silicon dioxide particles by ultrasonic spraying of a silica sol as a precursor is the subject of this work. The structural design of the obtained particles was defined as an organized structure of basic motives, silica chains forming so] particles, sub-particles and finally up to the particle level. TGA analysis was employed to define the size of the silica chains in the sol particles, The mean particle size obtained by spray pyrolysis was 1.68 mu m, with sub-particles of 25-30 nm. Based on the application of a suitable theoretical model, the mean particle diameter and sub-particle values were calculated as 1.8 mu m and 38.4 rim, respectively. The theoretically and experimentally obtained values are in good agreement, confirming that advanced modeling of the silicon dioxide structure at the particle and sub-particle level is possible. The mean size of a sol particle obtained in the hydrothermal procedure was 7.5 nm and the size of the structural motive of the silica chain consisting of sol particles is built up from 18-20 tetrahedral cells of silicon dioxide.",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Nanodesigning of SiO2 powders obtained from silica sols by ultrasonic spray pyrolysis",
volume = "10",
number = "10",
pages = "2684-2693",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3554"
}

Jokanović, V. R.,& Jokanovic, B.. (2008). Nanodesigning of SiO2 powders obtained from silica sols by ultrasonic spray pyrolysis. in Journal of Optoelectronics and Advanced Materials, 10(10), 2684-2693.
https://hdl.handle.net/21.15107/rcub_vinar_3554

Jokanović VR, Jokanovic B. Nanodesigning of SiO2 powders obtained from silica sols by ultrasonic spray pyrolysis. in Journal of Optoelectronics and Advanced Materials. 2008;10(10):2684-2693.
https://hdl.handle.net/21.15107/rcub_vinar_3554 .

Jokanović, Vukoman R., Jokanovic, B., "Nanodesigning of SiO2 powders obtained from silica sols by ultrasonic spray pyrolysis" in Journal of Optoelectronics and Advanced Materials, 10, no. 10 (2008):2684-2693,
https://hdl.handle.net/21.15107/rcub_vinar_3554 .