TY  - JOUR
AU  - Peles, A.
AU  - Aleksić, O.
AU  - Pavlović, Vera P.
AU  - Djoković, Vladimir
AU  - Dojčilović, Radovan
AU  - Nikolić, Z.
AU  - Marinković, F.
AU  - Mitrić, M.
AU  - Blagojević, Vladimir A.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4658
AB  - The influence of the mechanical activation of ZnO nanoparticle fillers on the structural and electrical properties of the matrix of poly(vinylidenefluoride)-ZnO (PVDF-ZnO) films was investigated. Transmission electron microscopy and scanning electron microscopy analyses showed that mechanical activation in a high energy planetary ball mill reduces the size of ZnO particles. X-ray diffraction and Raman spectroscopy revealed that PVDF crystallized predominantly as the gamma-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of alpha-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of beta-phase, indicating that mechanical activation of the filler can be used as a general method for fabrication of PVDF composites with increased content of piezoelectric beta-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of beta-phase (with ZnO filler activated for 5 min) exhibits the highest value of dielectric permittivity in 150-400 K range of temperatures. Kinetic analysis shows combined effects of increased surface area and increased concentration of surface defects on the interactions between polymer chains and activated nanoparticles.
PB  - IOP Publishing Ltd, Bristol
T2  - Physica Scripta
T1  - Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films
IS  - 10
VL  - 93
DO  - 10.1088/1402-4896/aad749
ER  - 

@article{
author = "Peles, A. and Aleksić, O. and Pavlović, Vera P. and Djoković, Vladimir and Dojčilović, Radovan and Nikolić, Z. and Marinković, F. and Mitrić, M. and Blagojević, Vladimir A. and Vlahović, Branislav and Pavlović, Vladimir",
year = "2018",
abstract = "The influence of the mechanical activation of ZnO nanoparticle fillers on the structural and electrical properties of the matrix of poly(vinylidenefluoride)-ZnO (PVDF-ZnO) films was investigated. Transmission electron microscopy and scanning electron microscopy analyses showed that mechanical activation in a high energy planetary ball mill reduces the size of ZnO particles. X-ray diffraction and Raman spectroscopy revealed that PVDF crystallized predominantly as the gamma-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of alpha-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of beta-phase, indicating that mechanical activation of the filler can be used as a general method for fabrication of PVDF composites with increased content of piezoelectric beta-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of beta-phase (with ZnO filler activated for 5 min) exhibits the highest value of dielectric permittivity in 150-400 K range of temperatures. Kinetic analysis shows combined effects of increased surface area and increased concentration of surface defects on the interactions between polymer chains and activated nanoparticles.",
publisher = "IOP Publishing Ltd, Bristol",
journal = "Physica Scripta",
title = "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films",
number = "10",
volume = "93",
doi = "10.1088/1402-4896/aad749"
}

Peles, A., Aleksić, O., Pavlović, V. P., Djoković, V., Dojčilović, R., Nikolić, Z., Marinković, F., Mitrić, M., Blagojević, V. A., Vlahović, B.,& Pavlović, V.. (2018). Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films. in Physica Scripta
IOP Publishing Ltd, Bristol., 93(10).
https://doi.org/10.1088/1402-4896/aad749

Peles A, Aleksić O, Pavlović VP, Djoković V, Dojčilović R, Nikolić Z, Marinković F, Mitrić M, Blagojević VA, Vlahović B, Pavlović V. Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films. in Physica Scripta. 2018;93(10).
doi:10.1088/1402-4896/aad749 .

Peles, A., Aleksić, O., Pavlović, Vera P., Djoković, Vladimir, Dojčilović, Radovan, Nikolić, Z., Marinković, F., Mitrić, M., Blagojević, Vladimir A., Vlahović, Branislav, Pavlović, Vladimir, "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films" in Physica Scripta, 93, no. 10 (2018),
https://doi.org/10.1088/1402-4896/aad749 . .

TY  - JOUR
AU  - Zlatkov, B.S.
AU  - Nikolić, M.V.
AU  - Zeljković, V.
AU  - Obradović, N.
AU  - Pavlović, Vladimir
AU  - Aleksić, O.
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2670
AB  - The powder injection moulding (PIM) technology is lately becoming more and more significant due to complex design possibilities and good repeatability. This technology requires optimization of all steps starting with material and binder, injection, debinding and sintering parameters. Sintering is one of the key links in this technology. The powder injection moulding process is specific as during feedstock injection powder particles mixed into the binder do not come into mechanical contact. Shrinkage during sintering of PIM samples is high. In this work we have analyzed and modeled the sintering process of isotropic PIM samples of Sr-hexaferrite. The Master Sintering Curve (MSC) principle has been applied to analyze sintering of two types of PIM Sr-hexaferrite samples with completely removed binder and only the extraction step of the debinding procedure (thermal debinding proceeding simultaneously with sintering). Influence of the heating rate on resulting sample microstructures has also been analyzed. Influence of the sintering time and temperature was analyzed using three different phenomenological equations.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Analysis and Modeling of Sintering of Sr-hexaferrite Produced by PIM Technology
EP  - 20
IS  - 1
SP  - 9
VL  - 43
DO  - 10.2298/SOS1101009Z
ER  - 

@article{
author = "Zlatkov, B.S. and Nikolić, M.V. and Zeljković, V. and Obradović, N. and Pavlović, Vladimir and Aleksić, O.",
year = "2011",
abstract = "The powder injection moulding (PIM) technology is lately becoming more and more significant due to complex design possibilities and good repeatability. This technology requires optimization of all steps starting with material and binder, injection, debinding and sintering parameters. Sintering is one of the key links in this technology. The powder injection moulding process is specific as during feedstock injection powder particles mixed into the binder do not come into mechanical contact. Shrinkage during sintering of PIM samples is high. In this work we have analyzed and modeled the sintering process of isotropic PIM samples of Sr-hexaferrite. The Master Sintering Curve (MSC) principle has been applied to analyze sintering of two types of PIM Sr-hexaferrite samples with completely removed binder and only the extraction step of the debinding procedure (thermal debinding proceeding simultaneously with sintering). Influence of the heating rate on resulting sample microstructures has also been analyzed. Influence of the sintering time and temperature was analyzed using three different phenomenological equations.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Analysis and Modeling of Sintering of Sr-hexaferrite Produced by PIM Technology",
pages = "20-9",
number = "1",
volume = "43",
doi = "10.2298/SOS1101009Z"
}

Zlatkov, B.S., Nikolić, M.V., Zeljković, V., Obradović, N., Pavlović, V.,& Aleksić, O.. (2011). Analysis and Modeling of Sintering of Sr-hexaferrite Produced by PIM Technology. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 43(1), 9-20.
https://doi.org/10.2298/SOS1101009Z

Zlatkov B, Nikolić M, Zeljković V, Obradović N, Pavlović V, Aleksić O. Analysis and Modeling of Sintering of Sr-hexaferrite Produced by PIM Technology. in Science of Sintering. 2011;43(1):9-20.
doi:10.2298/SOS1101009Z .

Zlatkov, B.S., Nikolić, M.V., Zeljković, V., Obradović, N., Pavlović, Vladimir, Aleksić, O., "Analysis and Modeling of Sintering of Sr-hexaferrite Produced by PIM Technology" in Science of Sintering, 43, no. 1 (2011):9-20,
https://doi.org/10.2298/SOS1101009Z . .