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Đoković, Vladimir

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  • Đoković, Vladimir (9)

Author's Bibliography

PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix

Pavlović, Vera P.; Tošić, Dragana; Dojčilović, Radovan; Dudić, Duško; Dramićanin, Miroslav D.; Medić, Mina; McPherson, Michael M.; Pavlović, Vladimir B.; Vlahović, Branislav; Đoković, Vladimir

(Elsevier BV, 2021)

TY  - JOUR
AU  - Pavlović, Vera P.
AU  - Tošić, Dragana
AU  - Dojčilović, Radovan
AU  - Dudić, Duško
AU  - Dramićanin, Miroslav D.
AU  - Medić, Mina
AU  - McPherson, Michael M.
AU  - Pavlović, Vladimir B.
AU  - Vlahović, Branislav
AU  - Đoković, Vladimir
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/10535
AB  - Na0.25K0.25Bi0.5TiO3 (NKBT) perovskite particles are synthesized by solid-state method and used as a filler for polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) co-polymer. X-ray diffraction analysis of NKBT powders shows that the particles have a rhombohedral perovskite crystal structure (R3c symmetry). Raman spectroscopy reveals that the co-polymer crystallizes predominantly into the mixture of polar β- and γ-crystals, while there is also a contribution of the non-polar α-crystal phase. The introduction of the NKBT into the PVDF-HFP results with an increase in effective dielectric permittivity and this effect depends on the inorganic content in the composite. The most interesting result of the present study is that the introduction of NKBT particles induces the appearance of an additional transition peak in the dielectric spectra of the co-polymer matrix. At the fixed frequency of ~2 kHz, the observed process appears at ~10 °C (about 45° above the glass transition temperature) and its magnitude strongly depends on the amount of the NKBT in the composite. Dielectric spectroscopy measurements of the composites are carried out in the wide range of frequencies (from 0.1 Hz to 1 MHz) and temperatures (from −100 to 100 °C). They reveal that the novel process can be clearly distinguished in the frequency range between 160 Hz and ~50 kHz.
PB  - Elsevier BV
T2  - Polymer Testing
T1  - PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix
SP  - 107093
VL  - 96
DO  - 10.1016/j.polymertesting.2021.107093
ER  - 
@article{
author = "Pavlović, Vera P. and Tošić, Dragana and Dojčilović, Radovan and Dudić, Duško and Dramićanin, Miroslav D. and Medić, Mina and McPherson, Michael M. and Pavlović, Vladimir B. and Vlahović, Branislav and Đoković, Vladimir",
year = "2021",
url = "https://dais.sanu.ac.rs/123456789/10535",
abstract = "Na0.25K0.25Bi0.5TiO3 (NKBT) perovskite particles are synthesized by solid-state method and used as a filler for polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) co-polymer. X-ray diffraction analysis of NKBT powders shows that the particles have a rhombohedral perovskite crystal structure (R3c symmetry). Raman spectroscopy reveals that the co-polymer crystallizes predominantly into the mixture of polar β- and γ-crystals, while there is also a contribution of the non-polar α-crystal phase. The introduction of the NKBT into the PVDF-HFP results with an increase in effective dielectric permittivity and this effect depends on the inorganic content in the composite. The most interesting result of the present study is that the introduction of NKBT particles induces the appearance of an additional transition peak in the dielectric spectra of the co-polymer matrix. At the fixed frequency of ~2 kHz, the observed process appears at ~10 °C (about 45° above the glass transition temperature) and its magnitude strongly depends on the amount of the NKBT in the composite. Dielectric spectroscopy measurements of the composites are carried out in the wide range of frequencies (from 0.1 Hz to 1 MHz) and temperatures (from −100 to 100 °C). They reveal that the novel process can be clearly distinguished in the frequency range between 160 Hz and ~50 kHz.",
publisher = "Elsevier BV",
journal = "Polymer Testing",
title = "PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix",
pages = "107093",
volume = "96",
doi = "10.1016/j.polymertesting.2021.107093"
}
Pavlović, V. P., Tošić, D., Dojčilović, R., Dudić, D., Dramićanin, M. D., Medić, M., McPherson, M. M., Pavlović, V. B., Vlahović, B.,& Đoković, V. (2021). PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix.
Polymer TestingElsevier BV., 96, 107093.
https://doi.org/10.1016/j.polymertesting.2021.107093
Pavlović VP, Tošić D, Dojčilović R, Dudić D, Dramićanin MD, Medić M, McPherson MM, Pavlović VB, Vlahović B, Đoković V. PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix. Polymer Testing. 2021;96:107093
Pavlović Vera P., Tošić Dragana, Dojčilović Radovan, Dudić Duško, Dramićanin Miroslav D., Medić Mina, McPherson Michael M., Pavlović Vladimir B., Vlahović Branislav, Đoković Vladimir, "PVDF-HFP/NKBT composite dielectrics: Perovskite particles induce the appearance of an additional dielectric relaxation process in ferroelectric polymer matrix" 96 (2021):107093,
https://doi.org/10.1016/j.polymertesting.2021.107093 .

Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films

Peleš, Adriana; Aleksić, Obrad S.; Pavlović, Vera P.; Đoković, Vladimir; Dojčilović, Radovan; Nikolić, Z.; Marinković, F.; Mitrić, Miodrag; Blagojević, Vladimir A.; Vlahović, Branislav; Pavlović, Vladimir B.

(IOP Publishing, 2018)

TY  - JOUR
AU  - Peleš, Adriana
AU  - Aleksić, Obrad S.
AU  - Pavlović, Vera P.
AU  - Đoković, Vladimir
AU  - Dojčilović, Radovan
AU  - Nikolić, Z.
AU  - Marinković, F.
AU  - Mitrić, Miodrag
AU  - Blagojević, Vladimir A.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4079
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 γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-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 β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-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. © 2018 IOP Publishing Ltd.
PB  - IOP Publishing
T2  - Physica Scripta
T1  - Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films
SP  - 105801
VL  - 93
DO  - 10.1088/1402-4896/aad749
ER  - 
@article{
author = "Peleš, Adriana and Aleksić, Obrad S. and Pavlović, Vera P. and Đoković, Vladimir and Dojčilović, Radovan and Nikolić, Z. and Marinković, F. and Mitrić, Miodrag and Blagojević, Vladimir A. and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4079",
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 γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-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 β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-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. © 2018 IOP Publishing Ltd.",
publisher = "IOP Publishing",
journal = "Physica Scripta",
title = "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films",
pages = "105801",
volume = "93",
doi = "10.1088/1402-4896/aad749"
}
Peleš, A., Aleksić, O. S., Pavlović, V. P., Đoković, V., Dojčilović, R., Nikolić, Z., Marinković, F., Mitrić, M., Blagojević, V. A., Vlahović, B.,& Pavlović, V. B. (2018). Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films.
Physica ScriptaIOP Publishing., 93, 105801.
https://doi.org/10.1088/1402-4896/aad749
Peleš A, Aleksić OS, Pavlović VP, Đoković V, Dojčilović R, Nikolić Z, Marinković F, Mitrić M, Blagojević VA, Vlahović B, Pavlović VB. Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films. Physica Scripta. 2018;93:105801
Peleš Adriana, Aleksić Obrad S., Pavlović Vera P., Đoković Vladimir, Dojčilović Radovan, Nikolić Z., Marinković F., Mitrić Miodrag, Blagojević Vladimir A., Vlahović Branislav, Pavlović Vladimir B., "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films" 93 (2018):105801,
https://doi.org/10.1088/1402-4896/aad749 .
1
6
4
6

Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films

Peleš, Adriana; Aleksić, Obrad S.; Pavlović, Vera P.; Đoković, Vladimir; Dojčilović, Radovan; Nikolić, Z.; Marinković, F.; Mitrić, Miodrag; Blagojević, Vladimir A.; Vlahović, Branislav; Pavlović, Vladimir B.

(IOP Publishing, 2018)

TY  - JOUR
AU  - Peleš, Adriana
AU  - Aleksić, Obrad S.
AU  - Pavlović, Vera P.
AU  - Đoković, Vladimir
AU  - Dojčilović, Radovan
AU  - Nikolić, Z.
AU  - Marinković, F.
AU  - Mitrić, Miodrag
AU  - Blagojević, Vladimir A.
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4608
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 γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-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 β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-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. © 2018 IOP Publishing Ltd.
PB  - IOP Publishing
T2  - Physica Scripta
T1  - Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films
SP  - 105801
VL  - 93
DO  - 10.1088/1402-4896/aad749
ER  - 
@article{
author = "Peleš, Adriana and Aleksić, Obrad S. and Pavlović, Vera P. and Đoković, Vladimir and Dojčilović, Radovan and Nikolić, Z. and Marinković, F. and Mitrić, Miodrag and Blagojević, Vladimir A. and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4608",
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 γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-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 β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-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. © 2018 IOP Publishing Ltd.",
publisher = "IOP Publishing",
journal = "Physica Scripta",
title = "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films",
pages = "105801",
volume = "93",
doi = "10.1088/1402-4896/aad749"
}
Peleš, A., Aleksić, O. S., Pavlović, V. P., Đoković, V., Dojčilović, R., Nikolić, Z., Marinković, F., Mitrić, M., Blagojević, V. A., Vlahović, B.,& Pavlović, V. B. (2018). Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films.
Physica ScriptaIOP Publishing., 93, 105801.
https://doi.org/10.1088/1402-4896/aad749
Peleš A, Aleksić OS, Pavlović VP, Đoković V, Dojčilović R, Nikolić Z, Marinković F, Mitrić M, Blagojević VA, Vlahović B, Pavlović VB. Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films. Physica Scripta. 2018;93:105801
Peleš Adriana, Aleksić Obrad S., Pavlović Vera P., Đoković Vladimir, Dojčilović Radovan, Nikolić Z., Marinković F., Mitrić Miodrag, Blagojević Vladimir A., Vlahović Branislav, Pavlović Vladimir B., "Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films" 93 (2018):105801,
https://doi.org/10.1088/1402-4896/aad749 .
1
6
4
6

DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells

Dojčilović, Radovan; Pajović, Jelena D.; Božanić, Dušan K.; Jović, Nataša; Pavlović, Vera P.; Pavlović, Vladimir B.; Acković, Lea Lenhardt; Zeković, Ivana; Dramićanin, Miroslav; Kaščaková, Slavka; Réfrégiers, Matthieu; Rašić, Goran; Vlahović, Branislav; Đoković, Vladimir

(IOP Publishing, 2018)

TY  - JOUR
AU  - Dojčilović, Radovan
AU  - Pajović, Jelena D.
AU  - Božanić, Dušan K.
AU  - Jović, Nataša
AU  - Pavlović, Vera P.
AU  - Pavlović, Vladimir B.
AU  - Acković, Lea Lenhardt
AU  - Zeković, Ivana
AU  - Dramićanin, Miroslav
AU  - Kaščaková, Slavka
AU  - Réfrégiers, Matthieu
AU  - Rašić, Goran
AU  - Vlahović, Branislav
AU  - Đoković, Vladimir
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4604
AB  - The interaction of partially reduced graphene oxide (prGO) and Huh7.5.1 liver cancer cells was investigated by means of DUV fluorescence bioimaging. The prGO sample was obtained by the reduction (to a certain extent) of the initially prepared graphene oxide (GO) nanosheets with hydrazine. The fluorescence of the GO nanosheets increases with time of the reduction due to a change in ratio of the sp2 and sp3 carbon sites and the prGO sample was extracted from the dispersion after 6 min, when the intensity of the fluorescence reached its maximum. The reduction process was left to proceed further to saturation until highly reduced graphene oxide (denoted here as rGO) was obtained. GO, prGO and rGO samples were investigated by structural (scanning electron microscopy (SEM), scanning transmission electron microscopy coupled with energy dispersive spectrometry (STEM-EDS)) and spectroscopic (UV-vis, photoluminescence (PL), Raman) methods. After that, Huh7.5.1 cells were incubated with GO, prGO and rGO nanosheets and used in bioimaging studies, which were performed on DISCO beamline of synchrotron SOLEIL. It was found that the prGO significantly enhanced the fluorescence of the cells and increased the intensity of the signal by ~2.5 times. Time-lapse fluorescence microscopy experiments showed that fluorescence dynamics strongly depends on the type of nanosheets used. The obtained prGO nanostructure can be easily conjugated with aromatic ring containing drugs, which opens a possibility for its applications in fluorescence microscopy monitored drug delivery. © 2018 IOP Publishing Ltd.
PB  - IOP Publishing
T2  - 2D Materials
T1  - DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells
SP  - 045019
VL  - 5
DO  - 10.1088/2053-1583/aad72b
ER  - 
@article{
author = "Dojčilović, Radovan and Pajović, Jelena D. and Božanić, Dušan K. and Jović, Nataša and Pavlović, Vera P. and Pavlović, Vladimir B. and Acković, Lea Lenhardt and Zeković, Ivana and Dramićanin, Miroslav and Kaščaková, Slavka and Réfrégiers, Matthieu and Rašić, Goran and Vlahović, Branislav and Đoković, Vladimir",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4604",
abstract = "The interaction of partially reduced graphene oxide (prGO) and Huh7.5.1 liver cancer cells was investigated by means of DUV fluorescence bioimaging. The prGO sample was obtained by the reduction (to a certain extent) of the initially prepared graphene oxide (GO) nanosheets with hydrazine. The fluorescence of the GO nanosheets increases with time of the reduction due to a change in ratio of the sp2 and sp3 carbon sites and the prGO sample was extracted from the dispersion after 6 min, when the intensity of the fluorescence reached its maximum. The reduction process was left to proceed further to saturation until highly reduced graphene oxide (denoted here as rGO) was obtained. GO, prGO and rGO samples were investigated by structural (scanning electron microscopy (SEM), scanning transmission electron microscopy coupled with energy dispersive spectrometry (STEM-EDS)) and spectroscopic (UV-vis, photoluminescence (PL), Raman) methods. After that, Huh7.5.1 cells were incubated with GO, prGO and rGO nanosheets and used in bioimaging studies, which were performed on DISCO beamline of synchrotron SOLEIL. It was found that the prGO significantly enhanced the fluorescence of the cells and increased the intensity of the signal by ~2.5 times. Time-lapse fluorescence microscopy experiments showed that fluorescence dynamics strongly depends on the type of nanosheets used. The obtained prGO nanostructure can be easily conjugated with aromatic ring containing drugs, which opens a possibility for its applications in fluorescence microscopy monitored drug delivery. © 2018 IOP Publishing Ltd.",
publisher = "IOP Publishing",
journal = "2D Materials",
title = "DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells",
pages = "045019",
volume = "5",
doi = "10.1088/2053-1583/aad72b"
}
Dojčilović, R., Pajović, J. D., Božanić, D. K., Jović, N., Pavlović, V. P., Pavlović, V. B., Acković, L. L., Zeković, I., Dramićanin, M., Kaščaková, S., Réfrégiers, M., Rašić, G., Vlahović, B.,& Đoković, V. (2018). DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells.
2D MaterialsIOP Publishing., 5, 045019.
https://doi.org/10.1088/2053-1583/aad72b
Dojčilović R, Pajović JD, Božanić DK, Jović N, Pavlović VP, Pavlović VB, Acković LL, Zeković I, Dramićanin M, Kaščaková S, Réfrégiers M, Rašić G, Vlahović B, Đoković V. DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells. 2D Materials. 2018;5:045019
Dojčilović Radovan, Pajović Jelena D., Božanić Dušan K., Jović Nataša, Pavlović Vera P., Pavlović Vladimir B., Acković Lea Lenhardt, Zeković Ivana, Dramićanin Miroslav, Kaščaková Slavka, Réfrégiers Matthieu, Rašić Goran, Vlahović Branislav, Đoković Vladimir, "DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells" 5 (2018):045019,
https://doi.org/10.1088/2053-1583/aad72b .
5

DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells

Dojčilović, Radovan; Pajović, Jelena D.; Božanić, Dušan K.; Jović, Nataša; Pavlović, Vera P.; Pavlović, Vladimir B.; Acković, Lea Lenhardt; Zeković, Ivana; Dramićanin, Miroslav; Kaščaková, Slavka; Réfrégiers, Matthieu; Rašić, Goran; Vlahović, Branislav; Đoković, Vladimir

(IOP Publishing, 2018)

TY  - JOUR
AU  - Dojčilović, Radovan
AU  - Pajović, Jelena D.
AU  - Božanić, Dušan K.
AU  - Jović, Nataša
AU  - Pavlović, Vera P.
AU  - Pavlović, Vladimir B.
AU  - Acković, Lea Lenhardt
AU  - Zeković, Ivana
AU  - Dramićanin, Miroslav
AU  - Kaščaková, Slavka
AU  - Réfrégiers, Matthieu
AU  - Rašić, Goran
AU  - Vlahović, Branislav
AU  - Đoković, Vladimir
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4081
AB  - The interaction of partially reduced graphene oxide (prGO) and Huh7.5.1 liver cancer cells was investigated by means of DUV fluorescence bioimaging. The prGO sample was obtained by the reduction (to a certain extent) of the initially prepared graphene oxide (GO) nanosheets with hydrazine. The fluorescence of the GO nanosheets increases with time of the reduction due to a change in ratio of the sp2 and sp3 carbon sites and the prGO sample was extracted from the dispersion after 6 min, when the intensity of the fluorescence reached its maximum. The reduction process was left to proceed further to saturation until highly reduced graphene oxide (denoted here as rGO) was obtained. GO, prGO and rGO samples were investigated by structural (scanning electron microscopy (SEM), scanning transmission electron microscopy coupled with energy dispersive spectrometry (STEM-EDS)) and spectroscopic (UV-vis, photoluminescence (PL), Raman) methods. After that, Huh7.5.1 cells were incubated with GO, prGO and rGO nanosheets and used in bioimaging studies, which were performed on DISCO beamline of synchrotron SOLEIL. It was found that the prGO significantly enhanced the fluorescence of the cells and increased the intensity of the signal by ~2.5 times. Time-lapse fluorescence microscopy experiments showed that fluorescence dynamics strongly depends on the type of nanosheets used. The obtained prGO nanostructure can be easily conjugated with aromatic ring containing drugs, which opens a possibility for its applications in fluorescence microscopy monitored drug delivery. © 2018 IOP Publishing Ltd.
PB  - IOP Publishing
T2  - 2D Materials
T1  - DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells
SP  - 045019
VL  - 5
DO  - 10.1088/2053-1583/aad72b
ER  - 
@article{
author = "Dojčilović, Radovan and Pajović, Jelena D. and Božanić, Dušan K. and Jović, Nataša and Pavlović, Vera P. and Pavlović, Vladimir B. and Acković, Lea Lenhardt and Zeković, Ivana and Dramićanin, Miroslav and Kaščaková, Slavka and Réfrégiers, Matthieu and Rašić, Goran and Vlahović, Branislav and Đoković, Vladimir",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4081",
abstract = "The interaction of partially reduced graphene oxide (prGO) and Huh7.5.1 liver cancer cells was investigated by means of DUV fluorescence bioimaging. The prGO sample was obtained by the reduction (to a certain extent) of the initially prepared graphene oxide (GO) nanosheets with hydrazine. The fluorescence of the GO nanosheets increases with time of the reduction due to a change in ratio of the sp2 and sp3 carbon sites and the prGO sample was extracted from the dispersion after 6 min, when the intensity of the fluorescence reached its maximum. The reduction process was left to proceed further to saturation until highly reduced graphene oxide (denoted here as rGO) was obtained. GO, prGO and rGO samples were investigated by structural (scanning electron microscopy (SEM), scanning transmission electron microscopy coupled with energy dispersive spectrometry (STEM-EDS)) and spectroscopic (UV-vis, photoluminescence (PL), Raman) methods. After that, Huh7.5.1 cells were incubated with GO, prGO and rGO nanosheets and used in bioimaging studies, which were performed on DISCO beamline of synchrotron SOLEIL. It was found that the prGO significantly enhanced the fluorescence of the cells and increased the intensity of the signal by ~2.5 times. Time-lapse fluorescence microscopy experiments showed that fluorescence dynamics strongly depends on the type of nanosheets used. The obtained prGO nanostructure can be easily conjugated with aromatic ring containing drugs, which opens a possibility for its applications in fluorescence microscopy monitored drug delivery. © 2018 IOP Publishing Ltd.",
publisher = "IOP Publishing",
journal = "2D Materials",
title = "DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells",
pages = "045019",
volume = "5",
doi = "10.1088/2053-1583/aad72b"
}
Dojčilović, R., Pajović, J. D., Božanić, D. K., Jović, N., Pavlović, V. P., Pavlović, V. B., Acković, L. L., Zeković, I., Dramićanin, M., Kaščaková, S., Réfrégiers, M., Rašić, G., Vlahović, B.,& Đoković, V. (2018). DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells.
2D MaterialsIOP Publishing., 5, 045019.
https://doi.org/10.1088/2053-1583/aad72b
Dojčilović R, Pajović JD, Božanić DK, Jović N, Pavlović VP, Pavlović VB, Acković LL, Zeković I, Dramićanin M, Kaščaková S, Réfrégiers M, Rašić G, Vlahović B, Đoković V. DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells. 2D Materials. 2018;5:045019
Dojčilović Radovan, Pajović Jelena D., Božanić Dušan K., Jović Nataša, Pavlović Vera P., Pavlović Vladimir B., Acković Lea Lenhardt, Zeković Ivana, Dramićanin Miroslav, Kaščaková Slavka, Réfrégiers Matthieu, Rašić Goran, Vlahović Branislav, Đoković Vladimir, "DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells" 5 (2018):045019,
https://doi.org/10.1088/2053-1583/aad72b .
5

Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of β-crystal polymorph rich matrix through mechanical activation of the filler

Mofokeng, Tladi G.; Luyt, Adriaan S.; Pavlović, Vera P.; Pavlović, Vladimir B.; Dudić, Duško; Vlahović, Branislav; Đoković, Vladimir

(AIP Publishing, 2014)

TY  - JOUR
AU  - Mofokeng, Tladi G.
AU  - Luyt, Adriaan S.
AU  - Pavlović, Vera P.
AU  - Pavlović, Vladimir B.
AU  - Dudić, Duško
AU  - Vlahović, Branislav
AU  - Đoković, Vladimir
PY  - 2014
UR  - http://dais.sanu.ac.rs/123456789/660
AB  - Nanocomposites of polyvinylidene fluoride/polymethyl methacrylate (PVDF/PMMA) blend and mechanically activated barium titanate (BaTiO3) particles were prepared by melt mixing. Modification of filler by means of mechanical activation has a profound effect on the crystallization of PVDF in the blend matrix. Raman analysis showed that the modified BaTiO3 particles, due to higher specific surfaces, induce, predominantly, the crystallization of the electrically active β-phase of PVDF, while the initial micron size particles induce the formation of the most common but non-polar α-crystal form. The introduction of activated particles reduces the overall crystallinity but slightly affects the crystallization and melting temperatures of the matrix. Dielectric spectroscopy revealed that at fixed filler content the dielectric constant of the blend increases with decreasing of the particle size (increasing of the activation time). A similar trend was observed for the storage moduli in dynamic mechanical analysis; the stiffness of the composite was higher when mechanically activated particles were used.
PB  - AIP Publishing
T2  - Journal of Applied Physics
T1  - Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of β-crystal polymorph rich matrix through mechanical activation of the filler
SP  - 084109
VL  - 115
DO  - 10.1063/1.4866694
ER  - 
@article{
author = "Mofokeng, Tladi G. and Luyt, Adriaan S. and Pavlović, Vera P. and Pavlović, Vladimir B. and Dudić, Duško and Vlahović, Branislav and Đoković, Vladimir",
year = "2014",
url = "http://dais.sanu.ac.rs/123456789/660",
abstract = "Nanocomposites of polyvinylidene fluoride/polymethyl methacrylate (PVDF/PMMA) blend and mechanically activated barium titanate (BaTiO3) particles were prepared by melt mixing. Modification of filler by means of mechanical activation has a profound effect on the crystallization of PVDF in the blend matrix. Raman analysis showed that the modified BaTiO3 particles, due to higher specific surfaces, induce, predominantly, the crystallization of the electrically active β-phase of PVDF, while the initial micron size particles induce the formation of the most common but non-polar α-crystal form. The introduction of activated particles reduces the overall crystallinity but slightly affects the crystallization and melting temperatures of the matrix. Dielectric spectroscopy revealed that at fixed filler content the dielectric constant of the blend increases with decreasing of the particle size (increasing of the activation time). A similar trend was observed for the storage moduli in dynamic mechanical analysis; the stiffness of the composite was higher when mechanically activated particles were used.",
publisher = "AIP Publishing",
journal = "Journal of Applied Physics",
title = "Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of β-crystal polymorph rich matrix through mechanical activation of the filler",
pages = "084109",
volume = "115",
doi = "10.1063/1.4866694"
}
Mofokeng, T. G., Luyt, A. S., Pavlović, V. P., Pavlović, V. B., Dudić, D., Vlahović, B.,& Đoković, V. (2014). Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of β-crystal polymorph rich matrix through mechanical activation of the filler.
Journal of Applied PhysicsAIP Publishing., 115, 084109.
https://doi.org/10.1063/1.4866694
Mofokeng TG, Luyt AS, Pavlović VP, Pavlović VB, Dudić D, Vlahović B, Đoković V. Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of β-crystal polymorph rich matrix through mechanical activation of the filler. Journal of Applied Physics. 2014;115:084109
Mofokeng Tladi G., Luyt Adriaan S., Pavlović Vera P., Pavlović Vladimir B., Dudić Duško, Vlahović Branislav, Đoković Vladimir, "Ferroelectric nanocomposites of polyvinylidene fluoride/polymethyl methacrylate blend and BaTiO3 particles: Fabrication of β-crystal polymorph rich matrix through mechanical activation of the filler" 115 (2014):084109,
https://doi.org/10.1063/1.4866694 .
30
27
30

Targeted Synthesis of Ceramic-Polymer Nanocomposites

Pavlović, Vladimir B.; Wu, M.; Đoković, Vladimir; Dukić, M.; Pavlović, Vera P.; Vlahović, Branislav

(Belgrade : Serbian Ceramic Society, 2014)

TY  - CONF
AU  - Pavlović, Vladimir B.
AU  - Wu, M.
AU  - Đoković, Vladimir
AU  - Dukić, M.
AU  - Pavlović, Vera P.
AU  - Vlahović, Branislav
PY  - 2014
UR  - http://dais.sanu.ac.rs/123456789/612
AB  - It is well known that materials used in nano-electro-mechanical systems (NEMS) must simultaneously satisfy numerous requirements for chemical, structural, mechanical and electrical properties. Taking into account that the application of targeted synthesis principles is fundamental for development of these materials, in this article the results of the investigation of the nano-scale grain size effects, grain/particle size induced structural transformations, the evolution of the particle structure during targeted synthesis process and microstructure modeling of ceramic-polymer nanocomposites, has been presented. The nanocomposite BT,ST/PVDF films were prepared by pulsed laser deposition (PLD) method and investigated by X-ray diffraction (XRD) method and Raman spectroscopy, while the microstructure morphology has been analyzed by scanning electron microscope (SEM). It was found that PLD of BT,ST on PVDF substrate offers a new set of opportunities for development of advanced flexible piezo-films for the next generation of NEMS, which applications span the aero-space industry, communications, defense systems, national security, health care, information technology and environmental monitoring.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014
T1  - Targeted Synthesis of Ceramic-Polymer Nanocomposites
SP  - 125
EP  - 125
ER  - 
@conference{
author = "Pavlović, Vladimir B. and Wu, M. and Đoković, Vladimir and Dukić, M. and Pavlović, Vera P. and Vlahović, Branislav",
year = "2014",
url = "http://dais.sanu.ac.rs/123456789/612",
abstract = "It is well known that materials used in nano-electro-mechanical systems (NEMS) must simultaneously satisfy numerous requirements for chemical, structural, mechanical and electrical properties. Taking into account that the application of targeted synthesis principles is fundamental for development of these materials, in this article the results of the investigation of the nano-scale grain size effects, grain/particle size induced structural transformations, the evolution of the particle structure during targeted synthesis process and microstructure modeling of ceramic-polymer nanocomposites, has been presented. The nanocomposite BT,ST/PVDF films were prepared by pulsed laser deposition (PLD) method and investigated by X-ray diffraction (XRD) method and Raman spectroscopy, while the microstructure morphology has been analyzed by scanning electron microscope (SEM). It was found that PLD of BT,ST on PVDF substrate offers a new set of opportunities for development of advanced flexible piezo-films for the next generation of NEMS, which applications span the aero-space industry, communications, defense systems, national security, health care, information technology and environmental monitoring.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014",
title = "Targeted Synthesis of Ceramic-Polymer Nanocomposites",
pages = "125-125"
}
Pavlović, V. B., Wu, M., Đoković, V., Dukić, M., Pavlović, V. P.,& Vlahović, B. (2014). Targeted Synthesis of Ceramic-Polymer Nanocomposites.
Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014Belgrade : Serbian Ceramic Society., 125-125.
Pavlović VB, Wu M, Đoković V, Dukić M, Pavlović VP, Vlahović B. Targeted Synthesis of Ceramic-Polymer Nanocomposites. Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014. 2014;:125-125
Pavlović Vladimir B., Wu M., Đoković Vladimir, Dukić M., Pavlović Vera P., Vlahović Branislav, "Targeted Synthesis of Ceramic-Polymer Nanocomposites" (2014):125-125

Pulsed Laser Deposition of BaTiO3 on PVDF substrate

Pavlović, Vera P.; Wu, M.; Đoković, Vladimir; Dukić, M.; Pavlović, Vladimir B.

(Belgrade : Serbian Ceramic Society, 2013)

TY  - CONF
AU  - Pavlović, Vera P.
AU  - Wu, M.
AU  - Đoković, Vladimir
AU  - Dukić, M.
AU  - Pavlović, Vladimir B.
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/429
AB  - Piezoelectric materials play an important role in development of advanced Micro-electromechanical systems (MEMS) and Nano-electro-mechanical systems (NEMS). Their applications span the aero-space industry, communications, defense systems, national security, health care, information technology and environmental monitoring. Materials used in MEMS/NEMS mustsimultaneously satisfy numerous requirements for chemical, structural, mechanical and electrical properties. Although traditionally MEMS in particular have relied on silicon, the materials used in MEMS/NEMS are becoming more heterogeneous. Taking into account that materials nanostructuring can produce unique mechanical, electrical and piezoelectric properties, in this article the investigation of pulsed laser deposition of BaTiO3 on PVDF substrate has been performed. The titanium-saphire laser operated at 800 nm with 40-fs pulse duration and 1 kHz repetition rate was focused onto a mechanically activated BaTiO3 target. Deposition on PVDF substrate was done at an oxygen partial pressure of 10-7 Torr using a laser pulse frequency of 1 kHz at room temperature. The crystal structure and the microstructure of the films were examined using an X-ray diffractometer and scanning electron microscope, while the surface morphology was observed by atomic force microscopy.It was found that pulsed laser deposition of BaTiO3 on PVDF substrate offers a new set of opportunities for development of advanced flexible piezo-films for the next generation of NEMS.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
T1  - Pulsed Laser Deposition of BaTiO3 on PVDF substrate
SP  - 48
EP  - 49
ER  - 
@conference{
author = "Pavlović, Vera P. and Wu, M. and Đoković, Vladimir and Dukić, M. and Pavlović, Vladimir B.",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/429",
abstract = "Piezoelectric materials play an important role in development of advanced Micro-electromechanical systems (MEMS) and Nano-electro-mechanical systems (NEMS). Their applications span the aero-space industry, communications, defense systems, national security, health care, information technology and environmental monitoring. Materials used in MEMS/NEMS mustsimultaneously satisfy numerous requirements for chemical, structural, mechanical and electrical properties. Although traditionally MEMS in particular have relied on silicon, the materials used in MEMS/NEMS are becoming more heterogeneous. Taking into account that materials nanostructuring can produce unique mechanical, electrical and piezoelectric properties, in this article the investigation of pulsed laser deposition of BaTiO3 on PVDF substrate has been performed. The titanium-saphire laser operated at 800 nm with 40-fs pulse duration and 1 kHz repetition rate was focused onto a mechanically activated BaTiO3 target. Deposition on PVDF substrate was done at an oxygen partial pressure of 10-7 Torr using a laser pulse frequency of 1 kHz at room temperature. The crystal structure and the microstructure of the films were examined using an X-ray diffractometer and scanning electron microscope, while the surface morphology was observed by atomic force microscopy.It was found that pulsed laser deposition of BaTiO3 on PVDF substrate offers a new set of opportunities for development of advanced flexible piezo-films for the next generation of NEMS.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade",
title = "Pulsed Laser Deposition of BaTiO3 on PVDF substrate",
pages = "48-49"
}
Pavlović, V. P., Wu, M., Đoković, V., Dukić, M.,& Pavlović, V. B. (2013). Pulsed Laser Deposition of BaTiO3 on PVDF substrate.
Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, BelgradeBelgrade : Serbian Ceramic Society., 48-49.
Pavlović VP, Wu M, Đoković V, Dukić M, Pavlović VB. Pulsed Laser Deposition of BaTiO3 on PVDF substrate. Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade. 2013;:48-49
Pavlović Vera P., Wu M., Đoković Vladimir, Dukić M., Pavlović Vladimir B., "Pulsed Laser Deposition of BaTiO3 on PVDF substrate" (2013):48-49

Piezoelectric polymer/ceramic nanostructures for mechanical energy harvesting

Pavlović, Vladimir B.; Peleš, Adriana; Pavlović, Vera P.; Đoković, Vladimir; Dojčilović, Radovan; Dukić, M.; Vlahović, Branislav

(Belgrade : Serbian Ceramic Society, 2013)

TY  - CONF
AU  - Pavlović, Vladimir B.
AU  - Peleš, Adriana
AU  - Pavlović, Vera P.
AU  - Đoković, Vladimir
AU  - Dojčilović, Radovan
AU  - Dukić, M.
AU  - Vlahović, Branislav
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/428
AB  - Vibration-based mechanical energy is one of the most accessible energy source in the surroundings. Harvesting this type of energy exhibits a great potential for remote/wireless sensing, charging batteries, and powering electronic devices. Piezoelectric and ferroelectric materials, including PZT, BaTiO3, ZnO, polyvinylidene fluoride (PVDF), etc., can be used for converting ambient mechanical energy into electricity. Based on these materials, a variety of micro- or nanoelectromechanical systems can be developed for harvesting energies from random vibrations, mechanical waves, or body movements like walking, running, or typing. Recent investigations on nanocomposites of electroactive ceramics and ferroelectric polymers exploit this approach in order to produce new multifunctional materials for mechanical energy harvesting. Taking into account that mechanical activation is one of the methods for modification of physico-chemical properties of the filler, in this study we investigate the influence of mechanical activation of ZnO particles on structural properties of ZnO/polyvinylidene fluoride nanocomposites. The nanocomposite films were prepared by solution casting method and investigated by X-ray diffraction (XRD) method and Raman spectroscopy, while the microstructure morphology has been analyzed by scanning electron microscope (SEM). Presented results will enable optimization of PVDF processing techniques for the production of new mechanical energy harvesting devices.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
T1  - Piezoelectric polymer/ceramic nanostructures for mechanical energy harvesting
SP  - 48
EP  - 48
ER  - 
@conference{
author = "Pavlović, Vladimir B. and Peleš, Adriana and Pavlović, Vera P. and Đoković, Vladimir and Dojčilović, Radovan and Dukić, M. and Vlahović, Branislav",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/428",
abstract = "Vibration-based mechanical energy is one of the most accessible energy source in the surroundings. Harvesting this type of energy exhibits a great potential for remote/wireless sensing, charging batteries, and powering electronic devices. Piezoelectric and ferroelectric materials, including PZT, BaTiO3, ZnO, polyvinylidene fluoride (PVDF), etc., can be used for converting ambient mechanical energy into electricity. Based on these materials, a variety of micro- or nanoelectromechanical systems can be developed for harvesting energies from random vibrations, mechanical waves, or body movements like walking, running, or typing. Recent investigations on nanocomposites of electroactive ceramics and ferroelectric polymers exploit this approach in order to produce new multifunctional materials for mechanical energy harvesting. Taking into account that mechanical activation is one of the methods for modification of physico-chemical properties of the filler, in this study we investigate the influence of mechanical activation of ZnO particles on structural properties of ZnO/polyvinylidene fluoride nanocomposites. The nanocomposite films were prepared by solution casting method and investigated by X-ray diffraction (XRD) method and Raman spectroscopy, while the microstructure morphology has been analyzed by scanning electron microscope (SEM). Presented results will enable optimization of PVDF processing techniques for the production of new mechanical energy harvesting devices.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade",
title = "Piezoelectric polymer/ceramic nanostructures for mechanical energy harvesting",
pages = "48-48"
}
Pavlović, V. B., Peleš, A., Pavlović, V. P., Đoković, V., Dojčilović, R., Dukić, M.,& Vlahović, B. (2013). Piezoelectric polymer/ceramic nanostructures for mechanical energy harvesting.
Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, BelgradeBelgrade : Serbian Ceramic Society., 48-48.
Pavlović VB, Peleš A, Pavlović VP, Đoković V, Dojčilović R, Dukić M, Vlahović B. Piezoelectric polymer/ceramic nanostructures for mechanical energy harvesting. Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade. 2013;:48-48
Pavlović Vladimir B., Peleš Adriana, Pavlović Vera P., Đoković Vladimir, Dojčilović Radovan, Dukić M., Vlahović Branislav, "Piezoelectric polymer/ceramic nanostructures for mechanical energy harvesting" (2013):48-48