TY  - JOUR
AU  - Petronijević, Ivan
AU  - Dudić, Duško
AU  - Cerović, Dragana
AU  - Maletić, Slavica
AU  - Marinković, Filip
AU  - Pergal, Marija
AU  - Anđelković, Ljubica
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6198
AB  - The dielectric properties of nanocomposites based on isotactic polypropylene (iPP) and atactic polystyrene (aPS) obtained by novel, simple, and environmentally friendly treatment technique have been analyzed in this study. The best treatment conditions to obtain nanocomposites with embedded core-shell particles with enhanced dielectric properties were considered. Treatment of polymer matrices in water solution iron(II)-chloride had the most pronounced precipitation effect, that was directly related to the appearance of higher transition metal concentrations in the iPP and aPS matrices, in comparison to treatments in the other two transition metal salts, MnCl2 and NiCl2. Relative dielectric constant and loss tangent have been studied in the frequency range from 20 Hz to 9 MHz. Embedded core-shell nanoparticles (from 15 to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) resulted in significant improvement (2.5% up to 9.1%) and stabilization of relative dielectric constant value toward higher frequencies and also lowering loss tangent in compare to starting polymer matrices. These properties indicate that materials obtained with the presented treatment technique can be applied as microelectronic packing and with further development of the method in order to obtain a higher concentration of metal ions as energy storage devices.
PB  - Wiley
T2  - Polymers for Advanced Technologies
T1  - Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions
SP  - 1
EP  - 10
DO  - 10.1002/pat.6110
ER  - 

@article{
author = "Petronijević, Ivan and Dudić, Duško and Cerović, Dragana and Maletić, Slavica and Marinković, Filip and Pergal, Marija and Anđelković, Ljubica",
year = "2023",
abstract = "The dielectric properties of nanocomposites based on isotactic polypropylene (iPP) and atactic polystyrene (aPS) obtained by novel, simple, and environmentally friendly treatment technique have been analyzed in this study. The best treatment conditions to obtain nanocomposites with embedded core-shell particles with enhanced dielectric properties were considered. Treatment of polymer matrices in water solution iron(II)-chloride had the most pronounced precipitation effect, that was directly related to the appearance of higher transition metal concentrations in the iPP and aPS matrices, in comparison to treatments in the other two transition metal salts, MnCl2 and NiCl2. Relative dielectric constant and loss tangent have been studied in the frequency range from 20 Hz to 9 MHz. Embedded core-shell nanoparticles (from 15 to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) resulted in significant improvement (2.5% up to 9.1%) and stabilization of relative dielectric constant value toward higher frequencies and also lowering loss tangent in compare to starting polymer matrices. These properties indicate that materials obtained with the presented treatment technique can be applied as microelectronic packing and with further development of the method in order to obtain a higher concentration of metal ions as energy storage devices.",
publisher = "Wiley",
journal = "Polymers for Advanced Technologies",
title = "Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions",
pages = "1-10",
doi = "10.1002/pat.6110"
}

Petronijević, I., Dudić, D., Cerović, D., Maletić, S., Marinković, F., Pergal, M.,& Anđelković, L.. (2023). Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions. in Polymers for Advanced Technologies
Wiley., 1-10.
https://doi.org/10.1002/pat.6110

Petronijević I, Dudić D, Cerović D, Maletić S, Marinković F, Pergal M, Anđelković L. Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions. in Polymers for Advanced Technologies. 2023;:1-10.
doi:10.1002/pat.6110 .

Petronijević, Ivan, Dudić, Duško, Cerović, Dragana, Maletić, Slavica, Marinković, Filip, Pergal, Marija, Anđelković, Ljubica, "Dielectric properties of iPP and aPS nanocomposites with core-shell particles obtained by treatment in transition metal salt solutions" in Polymers for Advanced Technologies (2023):1-10,
https://doi.org/10.1002/pat.6110 . .

TY  - CONF
AU  - Petronijević, Ivan
AU  - Dudić, Duško
AU  - Cerović, Dragana
AU  - Maletić, Slavica
AU  - Marinković, Filip
AU  - Pergal, Marija
AU  - Anđelković, Ljubica
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6023
AB  - Polymer nanocomposites are prepared by a simple and environmentally friendly technique. First, sheets of isotactic polypropylene (iPP) and atactic polystyrene (aPS) were prepared by compression molding with Servitec Polystat Press 200 T at 473.15 K and 3.0 MPa pressure followed by quenching in water at room temperature. The polymer sheets thus prepared were then immersed separately in three saturated salt water solutions (MnCl2, FeCl2, and NiCl2), at two temperatures (23ºC and 90ºC), and under influence of two DC electrical potentials (+4 kV, and ground potential). Count profiles and generated images of TOF – SIMS records have shown that higher temperature treatment (90ºC) and positive potential (+4kV) have given the highest count of iron ions and better distribution and dispersion of nanoparticles in polymer matrices. Also, the measured concentration of transition metals by ICP-OES confirmed higher concentrations of metals in nanocomposites obtained by these treatment conditions. It was stated that iron(II)-chloride had the highest concentration in iPP and aPS matrices in comparison to the other two transition salts. TEM micrographs showed spherically-shaped cores in the core-shell system and agglomerated particles of irregular shape. Encapsulation of iron cores prevented nanoparticles
from agglomeration. The cores of the investigated particles were probably iron oxides and/or hydroxides that occurred during the hydrolysis of iron salts in deionized water solution. Dielectric properties of obtained nanodielectrics were investigated. Relative dielectric constant and loss tangent has been studied in the frequency range from 20 Hz to 9 MHz. It was shown that adding the small amount of core-shell nanoparticles (from 15 nm to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) are resulted in significant improvement and stabilization of relative dielectric constant value and also lowering loss tangent in compare to starting polymer matrices.These dielectric properties were marked as suitable for nanodielectric application for high speed and high dencity microelectronic packaging.
PB  - Belgrade : SANU
C3  - The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia
T1  - Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application
SP  - 130
EP  - 130
UR  - https://hdl.handle.net/21.15107/rcub_cer_6023
ER  - 

@conference{
author = "Petronijević, Ivan and Dudić, Duško and Cerović, Dragana and Maletić, Slavica and Marinković, Filip and Pergal, Marija and Anđelković, Ljubica",
year = "2022",
abstract = "Polymer nanocomposites are prepared by a simple and environmentally friendly technique. First, sheets of isotactic polypropylene (iPP) and atactic polystyrene (aPS) were prepared by compression molding with Servitec Polystat Press 200 T at 473.15 K and 3.0 MPa pressure followed by quenching in water at room temperature. The polymer sheets thus prepared were then immersed separately in three saturated salt water solutions (MnCl2, FeCl2, and NiCl2), at two temperatures (23ºC and 90ºC), and under influence of two DC electrical potentials (+4 kV, and ground potential). Count profiles and generated images of TOF – SIMS records have shown that higher temperature treatment (90ºC) and positive potential (+4kV) have given the highest count of iron ions and better distribution and dispersion of nanoparticles in polymer matrices. Also, the measured concentration of transition metals by ICP-OES confirmed higher concentrations of metals in nanocomposites obtained by these treatment conditions. It was stated that iron(II)-chloride had the highest concentration in iPP and aPS matrices in comparison to the other two transition salts. TEM micrographs showed spherically-shaped cores in the core-shell system and agglomerated particles of irregular shape. Encapsulation of iron cores prevented nanoparticles
from agglomeration. The cores of the investigated particles were probably iron oxides and/or hydroxides that occurred during the hydrolysis of iron salts in deionized water solution. Dielectric properties of obtained nanodielectrics were investigated. Relative dielectric constant and loss tangent has been studied in the frequency range from 20 Hz to 9 MHz. It was shown that adding the small amount of core-shell nanoparticles (from 15 nm to 150 nm in diameter) in a very small amount (1.72E-8 mol/cm3 to 1.17E-5 mol/cm3) are resulted in significant improvement and stabilization of relative dielectric constant value and also lowering loss tangent in compare to starting polymer matrices.These dielectric properties were marked as suitable for nanodielectric application for high speed and high dencity microelectronic packaging.",
publisher = "Belgrade : SANU",
journal = "The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia",
title = "Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application",
pages = "130-130",
url = "https://hdl.handle.net/21.15107/rcub_cer_6023"
}

Petronijević, I., Dudić, D., Cerović, D., Maletić, S., Marinković, F., Pergal, M.,& Anđelković, L.. (2022). Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application. in The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia
Belgrade : SANU., 130-130.
https://hdl.handle.net/21.15107/rcub_cer_6023

Petronijević I, Dudić D, Cerović D, Maletić S, Marinković F, Pergal M, Anđelković L. Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application. in The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia. 2022;:130-130.
https://hdl.handle.net/21.15107/rcub_cer_6023 .

Petronijević, Ivan, Dudić, Duško, Cerović, Dragana, Maletić, Slavica, Marinković, Filip, Pergal, Marija, Anđelković, Ljubica, "Polymer nanocomposites filled with core-shell nanoparticles for nanodielectric application" in The Book of Abstracts, The 11th International Conference of the Balkan Physical Union, 28 August - 1 September, 2022, Belgrade, Serbia (2022):130-130,
https://hdl.handle.net/21.15107/rcub_cer_6023 .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Maletić, Slavica
AU  - Stefanov, Plamen
AU  - Pacevski, Aleksandar
AU  - Vasilić, Rastko
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4320
AB  - In this paper, we used plasma electrolytic oxidation (PEO) of titanium in water solution containing 10 g/L Na3PO4 center dot 12H(2)O + 2 g/L Eu2O3 powder for preparation of TiO2:Eu3+ coatings. The surfaces of obtained coatings exhibit a typical PEO porous structure. The energy dispersive X-ray spectroscopy analysis showed that the coatings are mainly composed of Ti, O, P, and Eu; it is observed that Eu content in the coatings increases with PEO time. The X-ray diffraction analysis indicated that the coatings are crystallized and composed of anatase and rutile TiO2 phases, with anatase being the dominant one. X-ray photoelectron spectroscopy revealed that Ti 2p spin-orbit components of TiO2:Eu3+ coatings are shifted towards higher binding energy, with respect to pure TiO2 coatings, suggesting that Eu3+ ions are incorporated into TiO2 lattice. Diffuse reflectance spectroscopy showed that TiO2:Eu3+ coatings exhibit evident red shift with respect to the pure TiO2 coatings. Photoluminescence (PL) emission spectra of TiO2:Eu3+ coatings are characterized by sharp emission bands in orange-red region ascribed to f-f transitions of Eu3+ ions from excited level D-5(0) to lower levels F-7(J) (J=0, 1, 2, 3, and 4). The excitation PL spectra of TiO2:Eu3+ coatings can be divided into two regions: the broad band region from 250 nm to 350 nm associated with charge transfer state of Eu3+ and the series of sharp peaks in the range from 350 nm to 550 rim corresponding to direct excitation of the Eu3+ ions. It is observed that the intensity of peaks in excitation and emission PL spectra increases with the concentration of Eu3+, but the peak positions remain practically unchanged. The ratio of PL emission for electric and magnetic dipole transitions indicates highly asymmetric environment around Eu3+ ions. The photocatalytic activity (PA) of TiO2:Eu3+ coatings is evaluated by measuring the photodegradation of methyl orange under simulated sunlight conditions. It is shown that PEO time, i.e., the amount of Eu3+ incorporated into coatings is an important factor affecting PA; TiO2:Eu3+ coating formed after 1 min of PEO time showed the highest PA.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation
VL  - 370
SP  - 218
EP  - 228
DO  - 10.1016/j.apsusc.2016.02.131
ER  - 

@article{
author = "Stojadinović, Stevan and Radić, Nenad and Grbić, Boško and Maletić, Slavica and Stefanov, Plamen and Pacevski, Aleksandar and Vasilić, Rastko",
year = "2016",
abstract = "In this paper, we used plasma electrolytic oxidation (PEO) of titanium in water solution containing 10 g/L Na3PO4 center dot 12H(2)O + 2 g/L Eu2O3 powder for preparation of TiO2:Eu3+ coatings. The surfaces of obtained coatings exhibit a typical PEO porous structure. The energy dispersive X-ray spectroscopy analysis showed that the coatings are mainly composed of Ti, O, P, and Eu; it is observed that Eu content in the coatings increases with PEO time. The X-ray diffraction analysis indicated that the coatings are crystallized and composed of anatase and rutile TiO2 phases, with anatase being the dominant one. X-ray photoelectron spectroscopy revealed that Ti 2p spin-orbit components of TiO2:Eu3+ coatings are shifted towards higher binding energy, with respect to pure TiO2 coatings, suggesting that Eu3+ ions are incorporated into TiO2 lattice. Diffuse reflectance spectroscopy showed that TiO2:Eu3+ coatings exhibit evident red shift with respect to the pure TiO2 coatings. Photoluminescence (PL) emission spectra of TiO2:Eu3+ coatings are characterized by sharp emission bands in orange-red region ascribed to f-f transitions of Eu3+ ions from excited level D-5(0) to lower levels F-7(J) (J=0, 1, 2, 3, and 4). The excitation PL spectra of TiO2:Eu3+ coatings can be divided into two regions: the broad band region from 250 nm to 350 nm associated with charge transfer state of Eu3+ and the series of sharp peaks in the range from 350 nm to 550 rim corresponding to direct excitation of the Eu3+ ions. It is observed that the intensity of peaks in excitation and emission PL spectra increases with the concentration of Eu3+, but the peak positions remain practically unchanged. The ratio of PL emission for electric and magnetic dipole transitions indicates highly asymmetric environment around Eu3+ ions. The photocatalytic activity (PA) of TiO2:Eu3+ coatings is evaluated by measuring the photodegradation of methyl orange under simulated sunlight conditions. It is shown that PEO time, i.e., the amount of Eu3+ incorporated into coatings is an important factor affecting PA; TiO2:Eu3+ coating formed after 1 min of PEO time showed the highest PA.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation",
volume = "370",
pages = "218-228",
doi = "10.1016/j.apsusc.2016.02.131"
}

Stojadinović, S., Radić, N., Grbić, B., Maletić, S., Stefanov, P., Pacevski, A.,& Vasilić, R.. (2016). Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation. in Applied Surface Science
Elsevier., 370, 218-228.
https://doi.org/10.1016/j.apsusc.2016.02.131

Stojadinović S, Radić N, Grbić B, Maletić S, Stefanov P, Pacevski A, Vasilić R. Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation. in Applied Surface Science. 2016;370:218-228.
doi:10.1016/j.apsusc.2016.02.131 .

Stojadinović, Stevan, Radić, Nenad, Grbić, Boško, Maletić, Slavica, Stefanov, Plamen, Pacevski, Aleksandar, Vasilić, Rastko, "Structural, photoluminescent and photocatalytic properties of TiO2:Eu3+ coatings formed by plasma electrolytic oxidation" in Applied Surface Science, 370 (2016):218-228,
https://doi.org/10.1016/j.apsusc.2016.02.131 . .