TY  - JOUR
AU  - Milić, Mirjana M.
AU  - Jović Orsini, Nataša
AU  - Požek, Miroslav
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13123
AB  - Ferrofluids based on magnetic iron oxide nanoparticles (IONPs) have been widely studied as multipurpose agents in various medical applications including magnetic hyperthermia, targeted drug delivery and magnetic resonance imaging (MRI). To increase their stability and compatibility with the living cells and thus improve their suitability for these purposes, the IONPs are often functionalized with different organic or inorganic molecules. In this work we report on the preparation of polyvinilpyrrolidone (PVP) functionalized IONPs through a simple co-precipitation method and investigated their suitability for magnetic hyperthermia and as a MRI contrast agent. Spherical PVP-coated IONPs, with an average particle size of ≈ 15 nm, showed superparamagnetic behavior and high saturation magnetization Ms = 80.7 emug−1, at room temperature. The specific absorption rate (SAR), a measure of the heating ability, ranged from 17 W/g to 721 W/g (evaluated for various combinations of AC magnetic field amplitudes and frequencies), while the intrinsic loss power (ILP) was in the range from 0.53 nHm2 kg−1 to 2.34 nHm2 kg−1. In addition to relatively good heating ability, high T2 relaxivity, r2 = 126 mM−1 s−1 and high r2/r1 ratio demonstrated that the preparation procedure used here can yield nanoparticles suitable for MRI guided localized magnetic hyperthermia.
T2  - Applied Physics A
T1  - Evaluating PVP coated iron oxide particles for localized magnetic hyperthermia and MRI imaging
VL  - 130
IS  - 5
SP  - 275
DO  - 10.1007/s00339-024-07452-4
ER  - 

@article{
author = "Milić, Mirjana M. and Jović Orsini, Nataša and Požek, Miroslav",
year = "2024",
abstract = "Ferrofluids based on magnetic iron oxide nanoparticles (IONPs) have been widely studied as multipurpose agents in various medical applications including magnetic hyperthermia, targeted drug delivery and magnetic resonance imaging (MRI). To increase their stability and compatibility with the living cells and thus improve their suitability for these purposes, the IONPs are often functionalized with different organic or inorganic molecules. In this work we report on the preparation of polyvinilpyrrolidone (PVP) functionalized IONPs through a simple co-precipitation method and investigated their suitability for magnetic hyperthermia and as a MRI contrast agent. Spherical PVP-coated IONPs, with an average particle size of ≈ 15 nm, showed superparamagnetic behavior and high saturation magnetization Ms = 80.7 emug−1, at room temperature. The specific absorption rate (SAR), a measure of the heating ability, ranged from 17 W/g to 721 W/g (evaluated for various combinations of AC magnetic field amplitudes and frequencies), while the intrinsic loss power (ILP) was in the range from 0.53 nHm2 kg−1 to 2.34 nHm2 kg−1. In addition to relatively good heating ability, high T2 relaxivity, r2 = 126 mM−1 s−1 and high r2/r1 ratio demonstrated that the preparation procedure used here can yield nanoparticles suitable for MRI guided localized magnetic hyperthermia.",
journal = "Applied Physics A",
title = "Evaluating PVP coated iron oxide particles for localized magnetic hyperthermia and MRI imaging",
volume = "130",
number = "5",
pages = "275",
doi = "10.1007/s00339-024-07452-4"
}

Milić, M. M., Jović Orsini, N.,& Požek, M.. (2024). Evaluating PVP coated iron oxide particles for localized magnetic hyperthermia and MRI imaging. in Applied Physics A, 130(5), 275.
https://doi.org/10.1007/s00339-024-07452-4

Milić MM, Jović Orsini N, Požek M. Evaluating PVP coated iron oxide particles for localized magnetic hyperthermia and MRI imaging. in Applied Physics A. 2024;130(5):275.
doi:10.1007/s00339-024-07452-4 .

Milić, Mirjana M., Jović Orsini, Nataša, Požek, Miroslav, "Evaluating PVP coated iron oxide particles for localized magnetic hyperthermia and MRI imaging" in Applied Physics A, 130, no. 5 (2024):275,
https://doi.org/10.1007/s00339-024-07452-4 . .

TY  - JOUR
AU  - Maletić, Slavica
AU  - Jović Orsini, Nataša
AU  - Milić, Mirjana
AU  - Dojčilović, Jablan
AU  - Montone, Amelia
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11994
AB  - Epoxy-rich carbon-based composites are well recognized materials in industries owing to their good mechanical properties and thermal stability. Here, dielectric properties of composites based on bisphenol-A-epoxy resin loaded with 5, 6, 10, and 15 wt% of graphite flakes (GF) have been studied. The frequency and temperature dependence of the dielectric permittivity, dielectric loss, and ac conductivity have been examined in temperature (−103 to 97°C) and frequency (20 Hz–200 kHz) range. Influence of the filler surface chemistry have been studied for composites loaded with 5 wt% GF obtained: (i) under wet milling, without or with adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH. The composite made of epoxy loaded with 5 wt% exfoliated expanded graphite flakes (EEG), was also prepared. The surface treatment with KOH notably increased dielectric constant of the composite, keeping low dielectric loss, while treatment with Triton-100x significantly increased tanδ. The composite loaded with exfoliated expanded graphite shows higher ac conductivity than those obtained with flaky graphite, GF. Possibility to change dielectric properties of the composites without changing the loading content can be used as an approach in tailoring one with desired dielectric properties.
T2  - Journal of Applied Polymer Science
T1  - Dielectric properties of epoxy/graphite flakes composites: Influence of loading and surface treatment
DO  - 10.1002/app.54881
ER  - 

@article{
author = "Maletić, Slavica and Jović Orsini, Nataša and Milić, Mirjana and Dojčilović, Jablan and Montone, Amelia",
year = "2023",
abstract = "Epoxy-rich carbon-based composites are well recognized materials in industries owing to their good mechanical properties and thermal stability. Here, dielectric properties of composites based on bisphenol-A-epoxy resin loaded with 5, 6, 10, and 15 wt% of graphite flakes (GF) have been studied. The frequency and temperature dependence of the dielectric permittivity, dielectric loss, and ac conductivity have been examined in temperature (−103 to 97°C) and frequency (20 Hz–200 kHz) range. Influence of the filler surface chemistry have been studied for composites loaded with 5 wt% GF obtained: (i) under wet milling, without or with adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH. The composite made of epoxy loaded with 5 wt% exfoliated expanded graphite flakes (EEG), was also prepared. The surface treatment with KOH notably increased dielectric constant of the composite, keeping low dielectric loss, while treatment with Triton-100x significantly increased tanδ. The composite loaded with exfoliated expanded graphite shows higher ac conductivity than those obtained with flaky graphite, GF. Possibility to change dielectric properties of the composites without changing the loading content can be used as an approach in tailoring one with desired dielectric properties.",
journal = "Journal of Applied Polymer Science",
title = "Dielectric properties of epoxy/graphite flakes composites: Influence of loading and surface treatment",
doi = "10.1002/app.54881"
}

Maletić, S., Jović Orsini, N., Milić, M., Dojčilović, J.,& Montone, A.. (2023). Dielectric properties of epoxy/graphite flakes composites: Influence of loading and surface treatment. in Journal of Applied Polymer Science.
https://doi.org/10.1002/app.54881

Maletić S, Jović Orsini N, Milić M, Dojčilović J, Montone A. Dielectric properties of epoxy/graphite flakes composites: Influence of loading and surface treatment. in Journal of Applied Polymer Science. 2023;.
doi:10.1002/app.54881 .

Maletić, Slavica, Jović Orsini, Nataša, Milić, Mirjana, Dojčilović, Jablan, Montone, Amelia, "Dielectric properties of epoxy/graphite flakes composites: Influence of loading and surface treatment" in Journal of Applied Polymer Science (2023),
https://doi.org/10.1002/app.54881 . .

TY  - CONF
AU  - Maletić, S.
AU  - Cerović, D.
AU  - Petronijević, A.
AU  - Milić, Mirjana
AU  - Jović Orsini, Nataša
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11761
AB  - Dielectric properties of composites based on bisphenol-A-epoxy resin loaded with various content of graphite flakes (GF) have been studied. The dielectric permeability, tangent loss and ac conductivity have been examined in wide temperature (170 – 370 K) and frequency (20 Hz – 200 kHz) range. In composites loaded with GF flakes up to 10 wt.%, the dominant conduction mechanism is tunneling of electrons, while loading of 15 wt.% gives rise to electron conduction through direct contacts between fillers. Dielectric properties of composites are largely determined by the nature of the filler/matrix interface, the filler surface area and the inherent conductivity of the fillers. At low electric field frequencies, dominates socalled interfacial (or space charge) polarization due to accumulation of free charges at the interfaces between two phases (filler and matrix), which differ in electrical conductivity.Influence of the filler surface chemistry have been studied for composites loaded with 5 wt.% graphite flakes obtained: (i) under wet milling, without (GF) or with (GF-Tr100x) adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH (GF-KOH). The surface treatment with KOH notable increased dielectric constant of the epoxy/GF-KOH5 composite, keeping low tangent loss, comparable to the counterpart, the epoxy/GF5 composite.
PB  - Society of Chemists and Technologists of Macedonia
C3  - 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia
T1  - Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites
SP  - 169
EP  - 169
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11761
ER  - 

@conference{
author = "Maletić, S. and Cerović, D. and Petronijević, A. and Milić, Mirjana and Jović Orsini, Nataša",
year = "2023",
abstract = "Dielectric properties of composites based on bisphenol-A-epoxy resin loaded with various content of graphite flakes (GF) have been studied. The dielectric permeability, tangent loss and ac conductivity have been examined in wide temperature (170 – 370 K) and frequency (20 Hz – 200 kHz) range. In composites loaded with GF flakes up to 10 wt.%, the dominant conduction mechanism is tunneling of electrons, while loading of 15 wt.% gives rise to electron conduction through direct contacts between fillers. Dielectric properties of composites are largely determined by the nature of the filler/matrix interface, the filler surface area and the inherent conductivity of the fillers. At low electric field frequencies, dominates socalled interfacial (or space charge) polarization due to accumulation of free charges at the interfaces between two phases (filler and matrix), which differ in electrical conductivity.Influence of the filler surface chemistry have been studied for composites loaded with 5 wt.% graphite flakes obtained: (i) under wet milling, without (GF) or with (GF-Tr100x) adding Triton-100x as a surfactant, or (ii) under dry milling in the presence of KOH (GF-KOH). The surface treatment with KOH notable increased dielectric constant of the epoxy/GF-KOH5 composite, keeping low tangent loss, comparable to the counterpart, the epoxy/GF5 composite.",
publisher = "Society of Chemists and Technologists of Macedonia",
journal = "26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia",
title = "Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites",
pages = "169-169",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11761"
}

Maletić, S., Cerović, D., Petronijević, A., Milić, M.,& Jović Orsini, N.. (2023). Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia
Society of Chemists and Technologists of Macedonia., 169-169.
https://hdl.handle.net/21.15107/rcub_vinar_11761

Maletić S, Cerović D, Petronijević A, Milić M, Jović Orsini N. Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites. in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia. 2023;:169-169.
https://hdl.handle.net/21.15107/rcub_vinar_11761 .

Maletić, S., Cerović, D., Petronijević, A., Milić, Mirjana, Jović Orsini, Nataša, "Interfacial Polarization and Dielectric Properties of Epoxy/Graphite Flakes Composites" in 26th Congress of the Society of Chemists and Technologists of Macedonia : the book of abstracts; September 20-23, Ohrid, Macedonia (2023):169-169,
https://hdl.handle.net/21.15107/rcub_vinar_11761 .

TY  - JOUR
AU  - Milić, Mirjana
AU  - Jović Orsini, Nataša
AU  - Markovic, Smilja
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11930
AB  - Four samples containing magnetic iron oxide nanoparticles (MIONs) of various sizes are prepared employing a simple low-temperature method of oxidative precipitation from FeCl2∙4H2O-NaOH-NaNO3 aqueous solution. For the preparation of two samples, the usual oxidation-precipitation synthesis protocol is modified by using ethylenediaminetetraacetic acid (EDTA) chelating agent as a stabilizer of the Fe2+ ions in a solution, which results in the partial capping of the prepared MIONs with EDTA molecules. Three out of four samples are subjected to citric acid (CA) functionalization in the post synthesis protocol. Structural and magnetic properties of the synthesized MIONs are assessed using various experimental techniques (XRD, TEM, Fourier transform infrared, dynamic light scattering, Mössbauer, and SQUID). The average size of spherical-like MIONs is tuned from 7 nm to 38 nm by changing the synthesis protocol. Their room temperature saturation magnetization, M s, is in the range of 43 to 91 emu g−1. Magnetic heating ability, expressed via specific absorption rate value, which ranges from 139 to 390 W/gFe, is discussed in relation to their structural and magnetic properties and the possible energy dissipation mechanisms involved. The best heating performance is exhibited by the sample decorated with EDTA and with a bimodal size distribution with average particle sizes of 14 and 37 nm and M s = 87 emu g−1. Though this sample contains particles prone to form aggregates, capping with EDTA provides good colloidal stability of this sample, thus preserving the magnetic heating ability. It is demonstrated that two samples, consisting of 7 nm-sized CA- or 14 nm-sized EDTA/CA-functionalized superparamagnetic MIONs, with a similar hydrodynamic radius, heat in a very similar way in the relatively fast oscillating alternating current magnetic field, f = 577 kHz.
T2  - Journal of Physics D: Applied Physics
T1  - CA and/or EDTA functionalized magnetic iron oxide nanoparticles by oxidative precipitation from FeCl2 solution: structural and magnetic study
VL  - 57
IS  - 2
SP  - 025001
DO  - 10.1088/1361-6463/acff06
ER  - 

@article{
author = "Milić, Mirjana and Jović Orsini, Nataša and Markovic, Smilja",
year = "2023",
abstract = "Four samples containing magnetic iron oxide nanoparticles (MIONs) of various sizes are prepared employing a simple low-temperature method of oxidative precipitation from FeCl2∙4H2O-NaOH-NaNO3 aqueous solution. For the preparation of two samples, the usual oxidation-precipitation synthesis protocol is modified by using ethylenediaminetetraacetic acid (EDTA) chelating agent as a stabilizer of the Fe2+ ions in a solution, which results in the partial capping of the prepared MIONs with EDTA molecules. Three out of four samples are subjected to citric acid (CA) functionalization in the post synthesis protocol. Structural and magnetic properties of the synthesized MIONs are assessed using various experimental techniques (XRD, TEM, Fourier transform infrared, dynamic light scattering, Mössbauer, and SQUID). The average size of spherical-like MIONs is tuned from 7 nm to 38 nm by changing the synthesis protocol. Their room temperature saturation magnetization, M s, is in the range of 43 to 91 emu g−1. Magnetic heating ability, expressed via specific absorption rate value, which ranges from 139 to 390 W/gFe, is discussed in relation to their structural and magnetic properties and the possible energy dissipation mechanisms involved. The best heating performance is exhibited by the sample decorated with EDTA and with a bimodal size distribution with average particle sizes of 14 and 37 nm and M s = 87 emu g−1. Though this sample contains particles prone to form aggregates, capping with EDTA provides good colloidal stability of this sample, thus preserving the magnetic heating ability. It is demonstrated that two samples, consisting of 7 nm-sized CA- or 14 nm-sized EDTA/CA-functionalized superparamagnetic MIONs, with a similar hydrodynamic radius, heat in a very similar way in the relatively fast oscillating alternating current magnetic field, f = 577 kHz.",
journal = "Journal of Physics D: Applied Physics",
title = "CA and/or EDTA functionalized magnetic iron oxide nanoparticles by oxidative precipitation from FeCl2 solution: structural and magnetic study",
volume = "57",
number = "2",
pages = "025001",
doi = "10.1088/1361-6463/acff06"
}

Milić, M., Jović Orsini, N.,& Markovic, S.. (2023). CA and/or EDTA functionalized magnetic iron oxide nanoparticles by oxidative precipitation from FeCl2 solution: structural and magnetic study. in Journal of Physics D: Applied Physics, 57(2), 025001.
https://doi.org/10.1088/1361-6463/acff06

Milić M, Jović Orsini N, Markovic S. CA and/or EDTA functionalized magnetic iron oxide nanoparticles by oxidative precipitation from FeCl2 solution: structural and magnetic study. in Journal of Physics D: Applied Physics. 2023;57(2):025001.
doi:10.1088/1361-6463/acff06 .

Milić, Mirjana, Jović Orsini, Nataša, Markovic, Smilja, "CA and/or EDTA functionalized magnetic iron oxide nanoparticles by oxidative precipitation from FeCl2 solution: structural and magnetic study" in Journal of Physics D: Applied Physics, 57, no. 2 (2023):025001,
https://doi.org/10.1088/1361-6463/acff06 . .

TY  - JOUR
AU  - Vukčević, Mira
AU  - Bošković, Ivana
AU  - Potparić, B.
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
AU  - Jović Orsini, Nataša
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9808
AB  - Geopolymers are potentially emerging class of new materials for building purposes due to their enhanced properties in comparison with Portland cement or other types of binders. Primary source for their production could be any natural alumosilicate material or the one coming from the industry in the form of waste. Production of geopolymers is considered as eco-friendly due to the low gas emission and potentially contributor to the lowering of the deposited industrial waste. The main problem in the geopolymer’s application rises along with potential brittleness caused by their porosity. The introduction of modifiers (inorganic and organic) could lead to the filling-the-pores process and consequently to the improvement of mechanical properties (compressive strength). Structure modification by organic phase leads to the production of so called “hybrids”. In this work, commercial epoxy resin and 3-(methoxyl) propyl methacrylate were used as organic modifiers. The purpose of this research was to make a comparison of the microstructural and mechanical properties between two different hybrids through the examination of relevant parameters such as the concentration of NaOH in the alkaline activator and the Si/Al mass ratio in the starting raw mixture. Hybrid geopolymer composities were characterised using XRD, DRIFT spectroscopy as well as SEM microscopy. © 2021, Scibulcom Ltd.. All rights reserved.
T2  - Journal of Environmental Protection and Ecology
T1  - Characterisation of metakaolin-based geopolymers as modified by organic phase
VL  - 22
IS  - 1
SP  - 164
EP  - 172
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9808
ER  - 

@article{
author = "Vukčević, Mira and Bošković, Ivana and Potparić, B. and Nenadović, Snežana S. and Kljajević, Ljiljana M. and Jović Orsini, Nataša",
year = "2021",
abstract = "Geopolymers are potentially emerging class of new materials for building purposes due to their enhanced properties in comparison with Portland cement or other types of binders. Primary source for their production could be any natural alumosilicate material or the one coming from the industry in the form of waste. Production of geopolymers is considered as eco-friendly due to the low gas emission and potentially contributor to the lowering of the deposited industrial waste. The main problem in the geopolymer’s application rises along with potential brittleness caused by their porosity. The introduction of modifiers (inorganic and organic) could lead to the filling-the-pores process and consequently to the improvement of mechanical properties (compressive strength). Structure modification by organic phase leads to the production of so called “hybrids”. In this work, commercial epoxy resin and 3-(methoxyl) propyl methacrylate were used as organic modifiers. The purpose of this research was to make a comparison of the microstructural and mechanical properties between two different hybrids through the examination of relevant parameters such as the concentration of NaOH in the alkaline activator and the Si/Al mass ratio in the starting raw mixture. Hybrid geopolymer composities were characterised using XRD, DRIFT spectroscopy as well as SEM microscopy. © 2021, Scibulcom Ltd.. All rights reserved.",
journal = "Journal of Environmental Protection and Ecology",
title = "Characterisation of metakaolin-based geopolymers as modified by organic phase",
volume = "22",
number = "1",
pages = "164-172",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9808"
}

Vukčević, M., Bošković, I., Potparić, B., Nenadović, S. S., Kljajević, L. M.,& Jović Orsini, N.. (2021). Characterisation of metakaolin-based geopolymers as modified by organic phase. in Journal of Environmental Protection and Ecology, 22(1), 164-172.
https://hdl.handle.net/21.15107/rcub_vinar_9808

Vukčević M, Bošković I, Potparić B, Nenadović SS, Kljajević LM, Jović Orsini N. Characterisation of metakaolin-based geopolymers as modified by organic phase. in Journal of Environmental Protection and Ecology. 2021;22(1):164-172.
https://hdl.handle.net/21.15107/rcub_vinar_9808 .

Vukčević, Mira, Bošković, Ivana, Potparić, B., Nenadović, Snežana S., Kljajević, Ljiljana M., Jović Orsini, Nataša, "Characterisation of metakaolin-based geopolymers as modified by organic phase" in Journal of Environmental Protection and Ecology, 22, no. 1 (2021):164-172,
https://hdl.handle.net/21.15107/rcub_vinar_9808 .

TY  - JOUR
AU  - Jović Orsini, Nataša
AU  - Milić, Mirjana M.
AU  - Torres, Teobaldo E.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8890
AB  - In this work, we studied structural and magnetic properties of 18 nm sized Zn-substituted magnetite, 28 nm sized unsubstituted and 17 nm sized (Mn, Zn)-substituted iron oxide nanoparticles, synthesized by thermal decomposition method. Their features were examined by analyzing the x-ray diffraction data, Fe-57 Mossbauer spectra and magnetization measurements by SQUID interferometer. The microstructure was inspected comparing the different size and strain broadening models incorporated into Fullprof software. In terms of crystallinity and size dispersion, applied synthesis protocol shows superiority over decomposition of iron oleate and the co-precipitation synthesis route. The saturation magnetization at T = 5 K was found to be within the M-S = 91.2-98.6 A m(2 )kg(-1) range, while at 300 K M-S of pure and Zn-substituted Fe3O4 nanoparticles is 83.6 and 86.2 A m(2 )kg(-1), respectively. Effective magnetic anisotropy constant K-eff, estimated under slow measurements by SQUID, is below 20 kJ m(-3) in all three samples. Some preliminary measurements of the magnetic hyperthermia performance, expressed via specific absorption rate value showed that the best heating performances were displayed by 18 nm sized oleic acid-coated Zn0.13Fe2.87O4 cubo-octahedrons with SAR approximately equal to 425 W/g(Fe) at H-0 = 20 kA m(-1) and f = 228 kHz.
T2  - Nanotechnology
T1  - Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties
VL  - 31
IS  - 22
SP  - 225707
DO  - 10.1088/1361-6528/ab76e7
ER  - 

@article{
author = "Jović Orsini, Nataša and Milić, Mirjana M. and Torres, Teobaldo E.",
year = "2020",
abstract = "In this work, we studied structural and magnetic properties of 18 nm sized Zn-substituted magnetite, 28 nm sized unsubstituted and 17 nm sized (Mn, Zn)-substituted iron oxide nanoparticles, synthesized by thermal decomposition method. Their features were examined by analyzing the x-ray diffraction data, Fe-57 Mossbauer spectra and magnetization measurements by SQUID interferometer. The microstructure was inspected comparing the different size and strain broadening models incorporated into Fullprof software. In terms of crystallinity and size dispersion, applied synthesis protocol shows superiority over decomposition of iron oleate and the co-precipitation synthesis route. The saturation magnetization at T = 5 K was found to be within the M-S = 91.2-98.6 A m(2 )kg(-1) range, while at 300 K M-S of pure and Zn-substituted Fe3O4 nanoparticles is 83.6 and 86.2 A m(2 )kg(-1), respectively. Effective magnetic anisotropy constant K-eff, estimated under slow measurements by SQUID, is below 20 kJ m(-3) in all three samples. Some preliminary measurements of the magnetic hyperthermia performance, expressed via specific absorption rate value showed that the best heating performances were displayed by 18 nm sized oleic acid-coated Zn0.13Fe2.87O4 cubo-octahedrons with SAR approximately equal to 425 W/g(Fe) at H-0 = 20 kA m(-1) and f = 228 kHz.",
journal = "Nanotechnology",
title = "Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties",
volume = "31",
number = "22",
pages = "225707",
doi = "10.1088/1361-6528/ab76e7"
}

Jović Orsini, N., Milić, M. M.,& Torres, T. E.. (2020). Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties. in Nanotechnology, 31(22), 225707.
https://doi.org/10.1088/1361-6528/ab76e7

Jović Orsini N, Milić MM, Torres TE. Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties. in Nanotechnology. 2020;31(22):225707.
doi:10.1088/1361-6528/ab76e7 .

Jović Orsini, Nataša, Milić, Mirjana M., Torres, Teobaldo E., "Zn- and (Mn, Zn)-substituted versus unsubstituted magnetite nanoparticles: structural, magnetic and hyperthermic properties" in Nanotechnology, 31, no. 22 (2020):225707,
https://doi.org/10.1088/1361-6528/ab76e7 . .

TY  - CONF
AU  - Dojčilović, Radovan
AU  - Pajović, J.
AU  - Božanić, Dušan K.
AU  - Jović Orsini, Nataša
AU  - Kaščakova, S.
AU  - Refregiers, M.
AU  - Đoković, Vladimir
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11866
AB  - Functional materials based on graphene oxide (GO) and reduced graphene oxide (rGO) have a high potential for application in the fields of biophysics, material science, and biomedical engineering [1]. It is due to their tunable physical properties, high surface area, remarkable photoluminescence, as well as their controllable chemical functionalization [2]. Beyond their applications in nanomedicine for drug/gene delivery, phototherapy and bioimaging, they have shown significant interaction and adhesive properties with proteins, mammalian cells and microorganisms, which makes them potential candidates for multifunctional biological applications. In this lecture, we will present a study of the interaction of partially reduced graphene oxide (prGO) with Huh7.5.1 liver cancer cells. The study was conducted by means of synchrotron excitation DUV fluorescence bioimaging (performed on DISCO beamline of synchrotron SOLEIL) [3]. The prGO sample was obtained by the reduction (to a certain extent) of the initially prepared GO nanosheets. The fluorescence of the GO nanosheets increases with time of the reduction due to a change in the ratio of the sp2 and sp3 carbon sites, and the prGO sample was extracted from the dispersion when the intensity of the fluorescence reached its maximum. After that, Huh7.5.1 cells were incubated with GO, prGO and rGO nanosheets and used in bioimaging studies. The presence of graphene materials influenced the fluorescence properties of the cells, and by analyzing fluorescence photobleaching dynamics, we were able to localize graphene nanosheets inside the liver cancer cells.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - Bioimaging of liver cancer cells incubated with partially reduced graphene oxide
SP  - 43
EP  - 43
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11866
ER  - 

@conference{
author = "Dojčilović, Radovan and Pajović, J. and Božanić, Dušan K. and Jović Orsini, Nataša and Kaščakova, S. and Refregiers, M. and Đoković, Vladimir",
year = "2019",
abstract = "Functional materials based on graphene oxide (GO) and reduced graphene oxide (rGO) have a high potential for application in the fields of biophysics, material science, and biomedical engineering [1]. It is due to their tunable physical properties, high surface area, remarkable photoluminescence, as well as their controllable chemical functionalization [2]. Beyond their applications in nanomedicine for drug/gene delivery, phototherapy and bioimaging, they have shown significant interaction and adhesive properties with proteins, mammalian cells and microorganisms, which makes them potential candidates for multifunctional biological applications. In this lecture, we will present a study of the interaction of partially reduced graphene oxide (prGO) with Huh7.5.1 liver cancer cells. The study was conducted by means of synchrotron excitation DUV fluorescence bioimaging (performed on DISCO beamline of synchrotron SOLEIL) [3]. The prGO sample was obtained by the reduction (to a certain extent) of the initially prepared GO nanosheets. The fluorescence of the GO nanosheets increases with time of the reduction due to a change in the ratio of the sp2 and sp3 carbon sites, and the prGO sample was extracted from the dispersion when the intensity of the fluorescence reached its maximum. After that, Huh7.5.1 cells were incubated with GO, prGO and rGO nanosheets and used in bioimaging studies. The presence of graphene materials influenced the fluorescence properties of the cells, and by analyzing fluorescence photobleaching dynamics, we were able to localize graphene nanosheets inside the liver cancer cells.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "Bioimaging of liver cancer cells incubated with partially reduced graphene oxide",
pages = "43-43",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11866"
}

Dojčilović, R., Pajović, J., Božanić, D. K., Jović Orsini, N., Kaščakova, S., Refregiers, M.,& Đoković, V.. (2019). Bioimaging of liver cancer cells incubated with partially reduced graphene oxide. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 43-43.
https://hdl.handle.net/21.15107/rcub_vinar_11866

Dojčilović R, Pajović J, Božanić DK, Jović Orsini N, Kaščakova S, Refregiers M, Đoković V. Bioimaging of liver cancer cells incubated with partially reduced graphene oxide. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:43-43.
https://hdl.handle.net/21.15107/rcub_vinar_11866 .

Dojčilović, Radovan, Pajović, J., Božanić, Dušan K., Jović Orsini, Nataša, Kaščakova, S., Refregiers, M., Đoković, Vladimir, "Bioimaging of liver cancer cells incubated with partially reduced graphene oxide" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):43-43,
https://hdl.handle.net/21.15107/rcub_vinar_11866 .

TY  - JOUR
AU  - Dojčilović, Radovan
AU  - Pajović, Jelena D.
AU  - Božanić, Dušan K.
AU  - Jović, Nataša G.
AU  - Pavlović, Vera P.
AU  - Pavlović, Vladimir B.
AU  - Lenhardt Acković, Lea
AU  - Zeković, Ivana Lj.
AU  - Dramićanin, Miroslav
AU  - Kaščakova, Slavka
AU  - Refregiers, Matthieu
AU  - Rašić, Goran
AU  - Vlahović, Branislav
AU  - Đoković, Vladimir
PY  - 2018
UR  - http://stacks.iop.org/2053-1583/5/i=4/a=045019?key=crossref.f455f07bdfb3469c8077963ff0f38f95
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7909
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.
T2  - 2D Materials
T1  - DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells
VL  - 5
IS  - 4
SP  - 045019
DO  - 10.1088/2053-1583/aad72b
ER  - 

@article{
author = "Dojčilović, Radovan and Pajović, Jelena D. and Božanić, Dušan K. and Jović, Nataša G. and Pavlović, Vera P. and Pavlović, Vladimir B. and Lenhardt Acković, Lea and Zeković, Ivana Lj. and Dramićanin, Miroslav and Kaščakova, Slavka and Refregiers, Matthieu and Rašić, Goran and Vlahović, Branislav and Đoković, Vladimir",
year = "2018",
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.",
journal = "2D Materials",
title = "DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells",
volume = "5",
number = "4",
pages = "045019",
doi = "10.1088/2053-1583/aad72b"
}

Dojčilović, R., Pajović, J. D., Božanić, D. K., Jović, N. G., Pavlović, V. P., Pavlović, V. B., Lenhardt Acković, L., Zeković, I. Lj., Dramićanin, M., Kaščakova, S., Refregiers, M., Rašić, G., Vlahović, B.,& Đoković, V.. (2018). DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells. in 2D Materials, 5(4), 045019.
https://doi.org/10.1088/2053-1583/aad72b

Dojčilović R, Pajović JD, Božanić DK, Jović NG, Pavlović VP, Pavlović VB, Lenhardt Acković L, Zeković IL, Dramićanin M, Kaščakova S, Refregiers M, Rašić G, Vlahović B, Đoković V. DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells. in 2D Materials. 2018;5(4):045019.
doi:10.1088/2053-1583/aad72b .

Dojčilović, Radovan, Pajović, Jelena D., Božanić, Dušan K., Jović, Nataša G., Pavlović, Vera P., Pavlović, Vladimir B., Lenhardt Acković, Lea, Zeković, Ivana Lj., Dramićanin, Miroslav, Kaščakova, Slavka, Refregiers, Matthieu, Rašić, Goran, Vlahović, Branislav, Đoković, Vladimir, "DUV fluorescence bioimaging study of the interaction of partially reduced graphene oxide and liver cancer cells" in 2D Materials, 5, no. 4 (2018):045019,
https://doi.org/10.1088/2053-1583/aad72b . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Pozek, Miroslav
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović Orsini, Nataša
AU  - Marković, Mirjana
AU  - Arsikin, Katarina M.
AU  - Paunović, Verica G.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1889
AB  - Ultrasmall iron oxide (USPIO) nanoparticles, with diameter mostly less than 3 nm dispersed in an organic carrier fluid were synthesized by polyol route. The evolution of ZFC-FC magnetization curves with temperature, as well as the shift of the ac susceptibility peaks upon changing the frequency, reveal that the nanoparticles in the fluid are non-interacting and superparamagnetic with the blocking temperature T-B similar to 10 K. The Mossbauer spectra analysis proposed the core/shell structure of the nanoparticles consisting of stoichiometric gamma-Fe2O3 core and non-stoichiometric shell. The nanoparticle surface layer has a great influence on their properties which is principally manifested in significant reduction of the magnetization and in a large increase in magnetic anisotropy. Magnetic moments do not saturate in fields up to 5 T, even at the lowest measured temperature, T = 5 K. The average magnetic particle diameter is changed from 1.3 to 1.8 nm with increasing magnetic field from 0 to 5 T which is noticeably smaller than the particle sizes measured by TEM. The estimated effective magnetic anisotropy constant value, K-eff = 2 x 10(5) J/m(3), is two orders of magnitude higher than in the bulk maghemite. Measurements of the longitudinal and transverse NMR relaxivity parameters on water diluted nanoparticle dispersions at 1.5 T gave the values r(1) = 0.028 mmol(-1) s(-1), r(2) = 0.050 mmol(-1) s(-1) and their ratio r(2)/r(1) = 1.8. Continuous increase of the T-1-weighted MRI signal intensity with increasing Fe concentration in the nanoparticle dispersions was observed which makes this ferrofluid to behave as a positive T-1 contrast agent. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Current Applied Physics
T1  - Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties
VL  - 18
IS  - 2
SP  - 141
EP  - 149
DO  - 10.1016/j.cap.2017.11.017
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Pozek, Miroslav and Jagličić, Zvonko and Makovec, Darko and Jović Orsini, Nataša and Marković, Mirjana and Arsikin, Katarina M. and Paunović, Verica G.",
year = "2018",
abstract = "Ultrasmall iron oxide (USPIO) nanoparticles, with diameter mostly less than 3 nm dispersed in an organic carrier fluid were synthesized by polyol route. The evolution of ZFC-FC magnetization curves with temperature, as well as the shift of the ac susceptibility peaks upon changing the frequency, reveal that the nanoparticles in the fluid are non-interacting and superparamagnetic with the blocking temperature T-B similar to 10 K. The Mossbauer spectra analysis proposed the core/shell structure of the nanoparticles consisting of stoichiometric gamma-Fe2O3 core and non-stoichiometric shell. The nanoparticle surface layer has a great influence on their properties which is principally manifested in significant reduction of the magnetization and in a large increase in magnetic anisotropy. Magnetic moments do not saturate in fields up to 5 T, even at the lowest measured temperature, T = 5 K. The average magnetic particle diameter is changed from 1.3 to 1.8 nm with increasing magnetic field from 0 to 5 T which is noticeably smaller than the particle sizes measured by TEM. The estimated effective magnetic anisotropy constant value, K-eff = 2 x 10(5) J/m(3), is two orders of magnitude higher than in the bulk maghemite. Measurements of the longitudinal and transverse NMR relaxivity parameters on water diluted nanoparticle dispersions at 1.5 T gave the values r(1) = 0.028 mmol(-1) s(-1), r(2) = 0.050 mmol(-1) s(-1) and their ratio r(2)/r(1) = 1.8. Continuous increase of the T-1-weighted MRI signal intensity with increasing Fe concentration in the nanoparticle dispersions was observed which makes this ferrofluid to behave as a positive T-1 contrast agent. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Current Applied Physics",
title = "Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties",
volume = "18",
number = "2",
pages = "141-149",
doi = "10.1016/j.cap.2017.11.017"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Pozek, M., Jagličić, Z., Makovec, D., Jović Orsini, N., Marković, M., Arsikin, K. M.,& Paunović, V. G.. (2018). Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties. in Current Applied Physics, 18(2), 141-149.
https://doi.org/10.1016/j.cap.2017.11.017

Babić-Stojić BS, Jokanović VR, Milivojević D, Pozek M, Jagličić Z, Makovec D, Jović Orsini N, Marković M, Arsikin KM, Paunović VG. Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties. in Current Applied Physics. 2018;18(2):141-149.
doi:10.1016/j.cap.2017.11.017 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Pozek, Miroslav, Jagličić, Zvonko, Makovec, Darko, Jović Orsini, Nataša, Marković, Mirjana, Arsikin, Katarina M., Paunović, Verica G., "Ultrasmall iron oxide nanoparticles: Magnetic and NMR relaxometric properties" in Current Applied Physics, 18, no. 2 (2018):141-149,
https://doi.org/10.1016/j.cap.2017.11.017 . .

TY  - JOUR
AU  - Jović Orsini, Nataša
AU  - Babić-Stojić, Branka S.
AU  - Spasojević, Vojislav
AU  - Calatayud, Maria Pilar
AU  - Cvjetićanin, Nikola
AU  - Goya, Gerardo F.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1835
AB  - Iron oxide magnetic nanoparticles with diameters d, 7 nm LT = d LT = 12 nm, were synthesized by thermal decomposition of Fe(acac)(3). Different experimental conditions, keeping constant concetration of Fe ions in solvent, showed that the heating rates is the most important parameter determining the final particle size. Use of two different solvents, 1-eicosene and 1-octadecene, yielded similar nanoparticle sizes (7.1 nm LT = d LT = 7.5 nm), but different magnetic anisotropies. All samples were superparamagnetic at room temperature. Spin disordering was inferred in samples coated with trioctylphosphine oxide (TOPO) co-ligand in addition to oleic acid and oleyamine. The heating ability of similar to 12 nm-sized nanoparticles dispersed in hexane under alternating magnetic fields (3.98 kA/m LT = H-0 LT = 23.87 kA/m; 229.3 kHz LT = f LT = 828 kHz) has been studied, finding a nearly quadratic dependence upon H-0, as expected from the linear response theory. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - Magnetic and power absorption measurements on iron oxide nanoparticles synthesized by thermal decomposition of Fe(acac)(3)
VL  - 449
SP  - 286
EP  - 296
DO  - 10.1016/j.jmmm.2017.10.053
ER  - 

@article{
author = "Jović Orsini, Nataša and Babić-Stojić, Branka S. and Spasojević, Vojislav and Calatayud, Maria Pilar and Cvjetićanin, Nikola and Goya, Gerardo F.",
year = "2018",
abstract = "Iron oxide magnetic nanoparticles with diameters d, 7 nm LT = d LT = 12 nm, were synthesized by thermal decomposition of Fe(acac)(3). Different experimental conditions, keeping constant concetration of Fe ions in solvent, showed that the heating rates is the most important parameter determining the final particle size. Use of two different solvents, 1-eicosene and 1-octadecene, yielded similar nanoparticle sizes (7.1 nm LT = d LT = 7.5 nm), but different magnetic anisotropies. All samples were superparamagnetic at room temperature. Spin disordering was inferred in samples coated with trioctylphosphine oxide (TOPO) co-ligand in addition to oleic acid and oleyamine. The heating ability of similar to 12 nm-sized nanoparticles dispersed in hexane under alternating magnetic fields (3.98 kA/m LT = H-0 LT = 23.87 kA/m; 229.3 kHz LT = f LT = 828 kHz) has been studied, finding a nearly quadratic dependence upon H-0, as expected from the linear response theory. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Magnetic and power absorption measurements on iron oxide nanoparticles synthesized by thermal decomposition of Fe(acac)(3)",
volume = "449",
pages = "286-296",
doi = "10.1016/j.jmmm.2017.10.053"
}

Jović Orsini, N., Babić-Stojić, B. S., Spasojević, V., Calatayud, M. P., Cvjetićanin, N.,& Goya, G. F.. (2018). Magnetic and power absorption measurements on iron oxide nanoparticles synthesized by thermal decomposition of Fe(acac)(3). in Journal of Magnetism and Magnetic Materials, 449, 286-296.
https://doi.org/10.1016/j.jmmm.2017.10.053

Jović Orsini N, Babić-Stojić BS, Spasojević V, Calatayud MP, Cvjetićanin N, Goya GF. Magnetic and power absorption measurements on iron oxide nanoparticles synthesized by thermal decomposition of Fe(acac)(3). in Journal of Magnetism and Magnetic Materials. 2018;449:286-296.
doi:10.1016/j.jmmm.2017.10.053 .

Jović Orsini, Nataša, Babić-Stojić, Branka S., Spasojević, Vojislav, Calatayud, Maria Pilar, Cvjetićanin, Nikola, Goya, Gerardo F., "Magnetic and power absorption measurements on iron oxide nanoparticles synthesized by thermal decomposition of Fe(acac)(3)" in Journal of Magnetism and Magnetic Materials, 449 (2018):286-296,
https://doi.org/10.1016/j.jmmm.2017.10.053 . .

TY  - JOUR
AU  - Bošković, Marko
AU  - Goya, Gerardo F.
AU  - Vranješ-Đurić, Sanja
AU  - Jović, Nataša G.
AU  - Jančar, Boštjan
AU  - Antić, Bratislav
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/461
AB  - Herein we present the results of specific loss power (SLP) analysis of polydisperse water based ferrofluids, Fe3O4/PEG200 and Fe3O4/PEG6000, with average Fe3O4 particle size of 9 nm and 11 nm, respectively. Specific loss power was measured in alternating magnetic field of various amplitudes and at fixed frequency of 580.5 kHz. Maximum SLP values acquired were 195 W/g for Fe3O4/PEG200 and 60 W/g for Fe3O4/PEG6000 samples. The samples were labeled as superparamagnetic by magnetization measurements, but SLP field dependence showed deviation from the behavior predicted by the commonly employed linear response theory. The scope of this theory for both samples with wide particle size distribution is discussed. Deviation from the expected behavior is explained by referring to polydisperse nature of the samples and field dependent relaxation rates. (C) 2015 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Influence of size distribution and field amplitude on specific loss power
VL  - 117
IS  - 10
DO  - 10.1063/1.4914074
ER  - 

@article{
author = "Bošković, Marko and Goya, Gerardo F. and Vranješ-Đurić, Sanja and Jović, Nataša G. and Jančar, Boštjan and Antić, Bratislav",
year = "2015",
abstract = "Herein we present the results of specific loss power (SLP) analysis of polydisperse water based ferrofluids, Fe3O4/PEG200 and Fe3O4/PEG6000, with average Fe3O4 particle size of 9 nm and 11 nm, respectively. Specific loss power was measured in alternating magnetic field of various amplitudes and at fixed frequency of 580.5 kHz. Maximum SLP values acquired were 195 W/g for Fe3O4/PEG200 and 60 W/g for Fe3O4/PEG6000 samples. The samples were labeled as superparamagnetic by magnetization measurements, but SLP field dependence showed deviation from the behavior predicted by the commonly employed linear response theory. The scope of this theory for both samples with wide particle size distribution is discussed. Deviation from the expected behavior is explained by referring to polydisperse nature of the samples and field dependent relaxation rates. (C) 2015 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Influence of size distribution and field amplitude on specific loss power",
volume = "117",
number = "10",
doi = "10.1063/1.4914074"
}

Bošković, M., Goya, G. F., Vranješ-Đurić, S., Jović, N. G., Jančar, B.,& Antić, B.. (2015). Influence of size distribution and field amplitude on specific loss power. in Journal of Applied Physics, 117(10).
https://doi.org/10.1063/1.4914074

Bošković M, Goya GF, Vranješ-Đurić S, Jović NG, Jančar B, Antić B. Influence of size distribution and field amplitude on specific loss power. in Journal of Applied Physics. 2015;117(10).
doi:10.1063/1.4914074 .

Bošković, Marko, Goya, Gerardo F., Vranješ-Đurić, Sanja, Jović, Nataša G., Jančar, Boštjan, Antić, Bratislav, "Influence of size distribution and field amplitude on specific loss power" in Journal of Applied Physics, 117, no. 10 (2015),
https://doi.org/10.1063/1.4914074 . .

TY  - JOUR
AU  - Radojkovic, A.
AU  - Savić, S. M.
AU  - Jović, Nataša G.
AU  - Ćirković, Jovana
AU  - Despotovic, Z.
AU  - Ribic, A.
AU  - Brankovic, Z.
AU  - Branković, Goran O.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/472
AB  - BaCe(0.9)Ee(0.1)O(2.95) (BCE) nanopowder was synthesized by citric-nitric autocombustion method. Rietveld refinement analysis showed that unit cell volume was slightly larger compared with the most known BaCe0.9Y0.1O2.95, which might contribute to higher proton mobility. Sinterability of BaCeO3 is also enhanced by doping with Eu, since dense single-phased BCE electrolyte microstructure comprising of 1-2mm grains was obtained after sintering at 1450 degrees C for 5 h. The electrochemical impedance spectroscopy (EIS) analysis revealed separate bulk and grain boundary contributions to the total electrolyte conductivity below 200 degrees C. The grain boundary conductivity was one to two orders of magnitude lower than the bulk conductivity, indicating blocking effect of the grain boundaries to the mobility of charge carriers. This effect diminished completely above 500 degrees C and only total conductivities were determined between 500 and 700 degrees C. Conductivity of BCE in a wet hydrogen atmosphere at 600 degrees C reached 1.2 x 10(-2) S/cm, which can be considered as one of the highest conductivities among BaCeO3 based proton conductors. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Electrochimica Acta
T1  - Structural and electrical properties of BaCe(0.9)Ee(0.1)O(2.95) electrolyte for IT-SOFCs
VL  - 161
SP  - 153
EP  - 158
DO  - 10.1016/j.electacta.2015.02.075
ER  - 

@article{
author = "Radojkovic, A. and Savić, S. M. and Jović, Nataša G. and Ćirković, Jovana and Despotovic, Z. and Ribic, A. and Brankovic, Z. and Branković, Goran O.",
year = "2015",
abstract = "BaCe(0.9)Ee(0.1)O(2.95) (BCE) nanopowder was synthesized by citric-nitric autocombustion method. Rietveld refinement analysis showed that unit cell volume was slightly larger compared with the most known BaCe0.9Y0.1O2.95, which might contribute to higher proton mobility. Sinterability of BaCeO3 is also enhanced by doping with Eu, since dense single-phased BCE electrolyte microstructure comprising of 1-2mm grains was obtained after sintering at 1450 degrees C for 5 h. The electrochemical impedance spectroscopy (EIS) analysis revealed separate bulk and grain boundary contributions to the total electrolyte conductivity below 200 degrees C. The grain boundary conductivity was one to two orders of magnitude lower than the bulk conductivity, indicating blocking effect of the grain boundaries to the mobility of charge carriers. This effect diminished completely above 500 degrees C and only total conductivities were determined between 500 and 700 degrees C. Conductivity of BCE in a wet hydrogen atmosphere at 600 degrees C reached 1.2 x 10(-2) S/cm, which can be considered as one of the highest conductivities among BaCeO3 based proton conductors. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Electrochimica Acta",
title = "Structural and electrical properties of BaCe(0.9)Ee(0.1)O(2.95) electrolyte for IT-SOFCs",
volume = "161",
pages = "153-158",
doi = "10.1016/j.electacta.2015.02.075"
}

Radojkovic, A., Savić, S. M., Jović, N. G., Ćirković, J., Despotovic, Z., Ribic, A., Brankovic, Z.,& Branković, G. O.. (2015). Structural and electrical properties of BaCe(0.9)Ee(0.1)O(2.95) electrolyte for IT-SOFCs. in Electrochimica Acta, 161, 153-158.
https://doi.org/10.1016/j.electacta.2015.02.075

Radojkovic A, Savić SM, Jović NG, Ćirković J, Despotovic Z, Ribic A, Brankovic Z, Branković GO. Structural and electrical properties of BaCe(0.9)Ee(0.1)O(2.95) electrolyte for IT-SOFCs. in Electrochimica Acta. 2015;161:153-158.
doi:10.1016/j.electacta.2015.02.075 .

Radojkovic, A., Savić, S. M., Jović, Nataša G., Ćirković, Jovana, Despotovic, Z., Ribic, A., Brankovic, Z., Branković, Goran O., "Structural and electrical properties of BaCe(0.9)Ee(0.1)O(2.95) electrolyte for IT-SOFCs" in Electrochimica Acta, 161 (2015):153-158,
https://doi.org/10.1016/j.electacta.2015.02.075 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović, Nataša G.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5912
AB  - The work presents structural and magnetic properties of ultrasmall magnetic nanoparticles consisting of inorganic iron oxide core and organic ester shell, dispersed in an organic fluid, synthesized via polyol route. The structure analysis shows that nanoparticles are crystalline, less than 3 nm in size, mutually clearly separated. The magnetic properties are in accordance with the size of the nanoparticles and do not indicate interparticle interactions. The particles show pure superparamagnetic behavior with very low blocking temperature. ZFCFC bifurcation and ac susceptibility peaks are at temperatures T-B LT 12 K. The properties of fluid were compared with dried powder sample. Drying of fluid brings about interactions between the magnetic nanoparticles that considerably affect spin dynamics of the particles. The surface of nanoparticles has a significant influence on their behavior. The Mssbauer parameters indicate existence of gamma-Fe2O3 core and non-stoichiometric surface layer. Magnetic field dependent magnetization analysis suggests smaller apparent size of the particles d(0) = 0.56 nm. High magnetic anisotropy due to surface layer anisotropy was measured to be of the order 10(6) erg/cm(3) that is two orders of magnitude higher than that in bulk material. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Magnetic properties of ultrasmall iron-oxide nanoparticles
VL  - 595
SP  - 153
EP  - 157
DO  - 10.1016/j.jallcom.2014.01.112
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Makovec, Darko and Jović, Nataša G.",
year = "2014",
abstract = "The work presents structural and magnetic properties of ultrasmall magnetic nanoparticles consisting of inorganic iron oxide core and organic ester shell, dispersed in an organic fluid, synthesized via polyol route. The structure analysis shows that nanoparticles are crystalline, less than 3 nm in size, mutually clearly separated. The magnetic properties are in accordance with the size of the nanoparticles and do not indicate interparticle interactions. The particles show pure superparamagnetic behavior with very low blocking temperature. ZFCFC bifurcation and ac susceptibility peaks are at temperatures T-B LT 12 K. The properties of fluid were compared with dried powder sample. Drying of fluid brings about interactions between the magnetic nanoparticles that considerably affect spin dynamics of the particles. The surface of nanoparticles has a significant influence on their behavior. The Mssbauer parameters indicate existence of gamma-Fe2O3 core and non-stoichiometric surface layer. Magnetic field dependent magnetization analysis suggests smaller apparent size of the particles d(0) = 0.56 nm. High magnetic anisotropy due to surface layer anisotropy was measured to be of the order 10(6) erg/cm(3) that is two orders of magnitude higher than that in bulk material. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Magnetic properties of ultrasmall iron-oxide nanoparticles",
volume = "595",
pages = "153-157",
doi = "10.1016/j.jallcom.2014.01.112"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Makovec, D.,& Jović, N. G.. (2014). Magnetic properties of ultrasmall iron-oxide nanoparticles. in Journal of Alloys and Compounds, 595, 153-157.
https://doi.org/10.1016/j.jallcom.2014.01.112

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Makovec D, Jović NG. Magnetic properties of ultrasmall iron-oxide nanoparticles. in Journal of Alloys and Compounds. 2014;595:153-157.
doi:10.1016/j.jallcom.2014.01.112 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Makovec, Darko, Jović, Nataša G., "Magnetic properties of ultrasmall iron-oxide nanoparticles" in Journal of Alloys and Compounds, 595 (2014):153-157,
https://doi.org/10.1016/j.jallcom.2014.01.112 . .

TY  - JOUR
AU  - Čolović, Božana M.
AU  - Jokanović, Vukoman R.
AU  - Jokanović, Bojan
AU  - Jović, Nataša G.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5931
AB  - The biomimetic deposition of hydroxyapatite (HA) on the surface of SiO2 thin film coated metal substrates was developed and investigated. The structural investigations of HA were made by XRD and FTIR-ATR, while morphological and chemical changes during HA biomimetic deposition on the surfaces of silica thin films were investigated by SEM with EDS. The HA film thicknesses were estimated from the mass changes of samples including the corresponding correction of the pore volume inside of them, which was calculated by the Lecloux and Pirard method based on the Dollimore-Heal method. (c) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Biomimetic deposition of hydroxyapatite on the surface of silica thin film covered steel tape
VL  - 40
IS  - 5
SP  - 6949
EP  - 6955
DO  - 10.1016/j.ceramint.2013.12.018
ER  - 

@article{
author = "Čolović, Božana M. and Jokanović, Vukoman R. and Jokanović, Bojan and Jović, Nataša G.",
year = "2014",
abstract = "The biomimetic deposition of hydroxyapatite (HA) on the surface of SiO2 thin film coated metal substrates was developed and investigated. The structural investigations of HA were made by XRD and FTIR-ATR, while morphological and chemical changes during HA biomimetic deposition on the surfaces of silica thin films were investigated by SEM with EDS. The HA film thicknesses were estimated from the mass changes of samples including the corresponding correction of the pore volume inside of them, which was calculated by the Lecloux and Pirard method based on the Dollimore-Heal method. (c) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Biomimetic deposition of hydroxyapatite on the surface of silica thin film covered steel tape",
volume = "40",
number = "5",
pages = "6949-6955",
doi = "10.1016/j.ceramint.2013.12.018"
}

Čolović, B. M., Jokanović, V. R., Jokanović, B.,& Jović, N. G.. (2014). Biomimetic deposition of hydroxyapatite on the surface of silica thin film covered steel tape. in Ceramics International, 40(5), 6949-6955.
https://doi.org/10.1016/j.ceramint.2013.12.018

Čolović BM, Jokanović VR, Jokanović B, Jović NG. Biomimetic deposition of hydroxyapatite on the surface of silica thin film covered steel tape. in Ceramics International. 2014;40(5):6949-6955.
doi:10.1016/j.ceramint.2013.12.018 .

Čolović, Božana M., Jokanović, Vukoman R., Jokanović, Bojan, Jović, Nataša G., "Biomimetic deposition of hydroxyapatite on the surface of silica thin film covered steel tape" in Ceramics International, 40, no. 5 (2014):6949-6955,
https://doi.org/10.1016/j.ceramint.2013.12.018 . .

TY  - JOUR
AU  - Jokanović, Vukoman R.
AU  - Čolović, Božana M.
AU  - Jović, Nataša G.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6083
AB  - The structural and luminescent properties of Ca2Y8(SiO4)(6)O-2 (CYS) silicate based oxyapatite doped with Eu3+ ions have been reported in this paper. The sample was synthesized using reflux method assisted by urea subsequent degradation. Very specific, shell- and and rope-like morphologies were observed by SEM. The powder X-ray diffraction study revealed that the Eu3+ : CYS system crystallized in a hexagonal lattice structure (space group P63/m) characteristic of oxyapatite. In the host oxyapatite structure, a partial replacement of Ca2+ and Y3+ ions by luminescent active Eu3+ ions have been done, and its photoluminescent spectra were analyzed. The performed analysis indicate the presence of Eu3+ ions in both, nine-fold coordinated 4f, and seven-fold coordinated 6h sites, showing a slight shift towards the blue area in comparison to a typical spectra of other yttrium-silicate phases as hosts.
T2  - Science of Sintering
T1  - The Luminescent Properties of Yttrium Oxyapatite Doped with Eu3+ ions
VL  - 46
IS  - 1
SP  - 129
EP  - 134
DO  - 10.2298/SOS1401129J
ER  - 

@article{
author = "Jokanović, Vukoman R. and Čolović, Božana M. and Jović, Nataša G.",
year = "2014",
abstract = "The structural and luminescent properties of Ca2Y8(SiO4)(6)O-2 (CYS) silicate based oxyapatite doped with Eu3+ ions have been reported in this paper. The sample was synthesized using reflux method assisted by urea subsequent degradation. Very specific, shell- and and rope-like morphologies were observed by SEM. The powder X-ray diffraction study revealed that the Eu3+ : CYS system crystallized in a hexagonal lattice structure (space group P63/m) characteristic of oxyapatite. In the host oxyapatite structure, a partial replacement of Ca2+ and Y3+ ions by luminescent active Eu3+ ions have been done, and its photoluminescent spectra were analyzed. The performed analysis indicate the presence of Eu3+ ions in both, nine-fold coordinated 4f, and seven-fold coordinated 6h sites, showing a slight shift towards the blue area in comparison to a typical spectra of other yttrium-silicate phases as hosts.",
journal = "Science of Sintering",
title = "The Luminescent Properties of Yttrium Oxyapatite Doped with Eu3+ ions",
volume = "46",
number = "1",
pages = "129-134",
doi = "10.2298/SOS1401129J"
}

Jokanović, V. R., Čolović, B. M.,& Jović, N. G.. (2014). The Luminescent Properties of Yttrium Oxyapatite Doped with Eu3+ ions. in Science of Sintering, 46(1), 129-134.
https://doi.org/10.2298/SOS1401129J

Jokanović VR, Čolović BM, Jović NG. The Luminescent Properties of Yttrium Oxyapatite Doped with Eu3+ ions. in Science of Sintering. 2014;46(1):129-134.
doi:10.2298/SOS1401129J .

Jokanović, Vukoman R., Čolović, Božana M., Jović, Nataša G., "The Luminescent Properties of Yttrium Oxyapatite Doped with Eu3+ ions" in Science of Sintering, 46, no. 1 (2014):129-134,
https://doi.org/10.2298/SOS1401129J . .

TY  - JOUR
AU  - Jović, Nataša G.
AU  - Calatayud, Maria Pilar
AU  - Sanz, Beatriz
AU  - Montone, Amelia
AU  - Goya, Gerardo F.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/137
AB  - Hybrid structures composed of exfoliated expanded graphite (EG) and iron oxide nanocrystals were produced by an ex situ process. The iron oxide nanoparticles coated with meso-2,3-dimercaptosuccinic acid (DMSA), or poly(acrylic acid) (PAA) were integrated onto the exfoliated EG flakes by mixing their aqueous suspensions at room temperature under the support of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinnimide (NHS). EG flakes both naked and functionalized with branched polyethylenimine (PEI) were employed. Complete integration of the two constituents was achieved and stability was maintained for more than 12 months. No preferential spatial distribution of anchoring sites for attachment of iron oxide nanoparticles was observed, regardless of whether the EG flakes were used naked or functionalized with PEI molecules. The structural and physicochemical characteristics of the exfoliated expanded graphite and its hybrid nano-structures were investigated by SEM, TEM, FTIR and Raman techniques.
T2  - Journal of the Serbian Chemical Society
T1  - Ex situ integration of iron oxide nanoparticles onto exfoliated expanded graphite flakes in aqueous suspension
VL  - 79
IS  - 9
SP  - 1155
EP  - 1167
DO  - 10.2298/JSC131121019J
ER  - 

@article{
author = "Jović, Nataša G. and Calatayud, Maria Pilar and Sanz, Beatriz and Montone, Amelia and Goya, Gerardo F.",
year = "2014",
abstract = "Hybrid structures composed of exfoliated expanded graphite (EG) and iron oxide nanocrystals were produced by an ex situ process. The iron oxide nanoparticles coated with meso-2,3-dimercaptosuccinic acid (DMSA), or poly(acrylic acid) (PAA) were integrated onto the exfoliated EG flakes by mixing their aqueous suspensions at room temperature under the support of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinnimide (NHS). EG flakes both naked and functionalized with branched polyethylenimine (PEI) were employed. Complete integration of the two constituents was achieved and stability was maintained for more than 12 months. No preferential spatial distribution of anchoring sites for attachment of iron oxide nanoparticles was observed, regardless of whether the EG flakes were used naked or functionalized with PEI molecules. The structural and physicochemical characteristics of the exfoliated expanded graphite and its hybrid nano-structures were investigated by SEM, TEM, FTIR and Raman techniques.",
journal = "Journal of the Serbian Chemical Society",
title = "Ex situ integration of iron oxide nanoparticles onto exfoliated expanded graphite flakes in aqueous suspension",
volume = "79",
number = "9",
pages = "1155-1167",
doi = "10.2298/JSC131121019J"
}

Jović, N. G., Calatayud, M. P., Sanz, B., Montone, A.,& Goya, G. F.. (2014). Ex situ integration of iron oxide nanoparticles onto exfoliated expanded graphite flakes in aqueous suspension. in Journal of the Serbian Chemical Society, 79(9), 1155-1167.
https://doi.org/10.2298/JSC131121019J

Jović NG, Calatayud MP, Sanz B, Montone A, Goya GF. Ex situ integration of iron oxide nanoparticles onto exfoliated expanded graphite flakes in aqueous suspension. in Journal of the Serbian Chemical Society. 2014;79(9):1155-1167.
doi:10.2298/JSC131121019J .

Jović, Nataša G., Calatayud, Maria Pilar, Sanz, Beatriz, Montone, Amelia, Goya, Gerardo F., "Ex situ integration of iron oxide nanoparticles onto exfoliated expanded graphite flakes in aqueous suspension" in Journal of the Serbian Chemical Society, 79, no. 9 (2014):1155-1167,
https://doi.org/10.2298/JSC131121019J . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Brankovic, D.
AU  - Jović, Nataša G.
AU  - Čolović, Božana M.
AU  - Čupić, Svetlana D.
AU  - Kojić, Dušan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5471
AB  - The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.
T2  - Science of Sintering
T1  - Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4
VL  - 45
IS  - 1
SP  - 69
EP  - 78
DO  - 10.2298/SOS1301069M
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Brankovic, D. and Jović, Nataša G. and Čolović, Božana M. and Čupić, Svetlana D. and Kojić, Dušan",
year = "2013",
abstract = "The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.",
journal = "Science of Sintering",
title = "Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4",
volume = "45",
number = "1",
pages = "69-78",
doi = "10.2298/SOS1301069M"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Brankovic, D., Jović, N. G., Čolović, B. M., Čupić, S. D.,& Kojić, D.. (2013). Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4. in Science of Sintering, 45(1), 69-78.
https://doi.org/10.2298/SOS1301069M

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Brankovic D, Jović NG, Čolović BM, Čupić SD, Kojić D. Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4. in Science of Sintering. 2013;45(1):69-78.
doi:10.2298/SOS1301069M .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Brankovic, D., Jović, Nataša G., Čolović, Božana M., Čupić, Svetlana D., Kojić, Dušan, "Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4" in Science of Sintering, 45, no. 1 (2013):69-78,
https://doi.org/10.2298/SOS1301069M . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović, Nataša G.
AU  - Marinović-Cincović, Milena
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5563
AB  - We present a study of dynamic magnetic properties of superparamagnetic CoFe2O4 nanoparticles of average size 5.9 nm suspended in an organic liquid. The relaxation times of the particle magnetic moments are found to be strongly dependent on the size of the particles, and also considerably dependent on interparticle interactions. Besides the lower frequency peak, an additional much faster relaxation is observed in the frequency dependence of the imaginary part of the ac magnetic susceptibility below the freezing point of the liquid. It is found that a large contribution to the magnetic relaxation of the lower frequency peak originates from the particles of dimensions 6.3-5.1 nm with interparticle interactions in the range 25-82 K, which correspond to nearer-neighbor particles. Much faster relaxation indicates that its significant part arises from the particles of dimensions 5.8-5.0 nm with interactions in the range 1-52 K which include also more distant neighbors. (C) 2013 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles
VL  - 113
IS  - 23
DO  - 10.1063/1.4811537
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Jagličić, Zvonko and Makovec, Darko and Jović, Nataša G. and Marinović-Cincović, Milena",
year = "2013",
abstract = "We present a study of dynamic magnetic properties of superparamagnetic CoFe2O4 nanoparticles of average size 5.9 nm suspended in an organic liquid. The relaxation times of the particle magnetic moments are found to be strongly dependent on the size of the particles, and also considerably dependent on interparticle interactions. Besides the lower frequency peak, an additional much faster relaxation is observed in the frequency dependence of the imaginary part of the ac magnetic susceptibility below the freezing point of the liquid. It is found that a large contribution to the magnetic relaxation of the lower frequency peak originates from the particles of dimensions 6.3-5.1 nm with interparticle interactions in the range 25-82 K, which correspond to nearer-neighbor particles. Much faster relaxation indicates that its significant part arises from the particles of dimensions 5.8-5.0 nm with interactions in the range 1-52 K which include also more distant neighbors. (C) 2013 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles",
volume = "113",
number = "23",
doi = "10.1063/1.4811537"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Jagličić, Z., Makovec, D., Jović, N. G.,& Marinović-Cincović, M.. (2013). Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles. in Journal of Applied Physics, 113(23).
https://doi.org/10.1063/1.4811537

Babić-Stojić BS, Jokanović VR, Milivojević D, Jagličić Z, Makovec D, Jović NG, Marinović-Cincović M. Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles. in Journal of Applied Physics. 2013;113(23).
doi:10.1063/1.4811537 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Jagličić, Zvonko, Makovec, Darko, Jović, Nataša G., Marinović-Cincović, Milena, "Magnetic properties and magnetic relaxation in a suspension of CoFe2O4 nanoparticles" in Journal of Applied Physics, 113, no. 23 (2013),
https://doi.org/10.1063/1.4811537 . .

TY  - JOUR
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Milivojević, Dušan
AU  - Jagličić, Zvonko
AU  - Makovec, Darko
AU  - Jović, Nataša G.
AU  - Marinović-Cincović, Milena
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5773
AB  - We present a study of magnetic and structural properties of CoFe2O4 nanoparticles suspended in an organic liquid. Transmission electron microscopy shows that the nanoparticles have a narrow size distribution of average particle size 5.9 +/- 1.0 nm. X-ray diffraction shows that the particles are of cubic spinel crystal structure. Dynamic light scattering measurements reveal the existence of an organic shell around the CoFe2O4 nanoparticles with an average hydrodynamic diameter of 14.4 nm. Coercive magnetic field at T = 5 K is found to be 11.8 kOe. Disappearance of the coercive field and remanent magnetization at about 170 K suggests that the CoFe2O4 nanoparticles are superparamagnetic at higher temperatures which is confirmed by the room temperature Mossbauer spectrum analysis. Saturation magnetization of the nanoparticles of 80.8 emu/g(CoFe2O4) at 5 K reaches the value detected in the bulk material and remains very high also at room temperature. The cobalt ferrite nanoparticle system synthesized in this work exhibits magnetic properties which are very suitable for various biomedical applications.
T2  - Journal of Nanomaterials
T1  - Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid
SP  - 741036
DO  - 10.1155/2013/741036
ER  - 

@article{
author = "Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Milivojević, Dušan and Jagličić, Zvonko and Makovec, Darko and Jović, Nataša G. and Marinović-Cincović, Milena",
year = "2013",
abstract = "We present a study of magnetic and structural properties of CoFe2O4 nanoparticles suspended in an organic liquid. Transmission electron microscopy shows that the nanoparticles have a narrow size distribution of average particle size 5.9 +/- 1.0 nm. X-ray diffraction shows that the particles are of cubic spinel crystal structure. Dynamic light scattering measurements reveal the existence of an organic shell around the CoFe2O4 nanoparticles with an average hydrodynamic diameter of 14.4 nm. Coercive magnetic field at T = 5 K is found to be 11.8 kOe. Disappearance of the coercive field and remanent magnetization at about 170 K suggests that the CoFe2O4 nanoparticles are superparamagnetic at higher temperatures which is confirmed by the room temperature Mossbauer spectrum analysis. Saturation magnetization of the nanoparticles of 80.8 emu/g(CoFe2O4) at 5 K reaches the value detected in the bulk material and remains very high also at room temperature. The cobalt ferrite nanoparticle system synthesized in this work exhibits magnetic properties which are very suitable for various biomedical applications.",
journal = "Journal of Nanomaterials",
title = "Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid",
pages = "741036",
doi = "10.1155/2013/741036"
}

Babić-Stojić, B. S., Jokanović, V. R., Milivojević, D., Jagličić, Z., Makovec, D., Jović, N. G.,& Marinović-Cincović, M.. (2013). Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid. in Journal of Nanomaterials, 741036.
https://doi.org/10.1155/2013/741036

Babić-Stojić BS, Jokanović VR, Milivojević D, Jagličić Z, Makovec D, Jović NG, Marinović-Cincović M. Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid. in Journal of Nanomaterials. 2013;:741036.
doi:10.1155/2013/741036 .

Babić-Stojić, Branka S., Jokanović, Vukoman R., Milivojević, Dušan, Jagličić, Zvonko, Makovec, Darko, Jović, Nataša G., Marinović-Cincović, Milena, "Magnetic and Structural Studies of CoFe2O4 Nanoparticles Suspended in an Organic Liquid" in Journal of Nanomaterials (2013):741036,
https://doi.org/10.1155/2013/741036 . .

TY  - JOUR
AU  - Jokanović, Vukoman R.
AU  - Čolović, Božana M.
AU  - Jović, Nataša G.
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Bojan
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5737
AB  - Low-temperature synthesis of fluorapatite/fluorohydroxyapatite with precursor mixture previously mechanochemically treated is described in this article. Ethylene vinylacetate/versatate copolymer as a surface active substance was mechanically treated to obtain a core-shell system with strongly controlled grain size. Despite usual behavior of mechanically activated systems, only an amorphous phase formed from precursor ions present in the mixture composed of -Ca2P2O7, CaCO3, CaF2, and unreacted Ca(OH)(2) was obtained during milling for 5min to 8h. The mixture contained depots of labile F- ions conserved in micelles cages, which are useful for teeth protection from carries. For transformation of these amorphous phases into fluorapatite, an additional low thermal treatment was necessary. The mechanism of the precursor mixture transformation into fluorapatite during milling and thermal treatment was investigated using FTIR spectroscopy and X-ray diffraction. The morphology and size distribution of the obtained powders was studied using SEM and TEM.
T2  - International Journal of Applied Ceramic Technology
T1  - Mechanochemical and Low-Temperature Synthesis of Nanocrystalline Fluorohydroxyapatite/Fluorapatite
VL  - 10
IS  - 6
SP  - 957
EP  - 969
DO  - 10.1111/j.1744-7402.2012.02821.x
ER  - 

@article{
author = "Jokanović, Vukoman R. and Čolović, Božana M. and Jović, Nataša G. and Babić-Stojić, Branka S. and Jokanović, Bojan",
year = "2013",
abstract = "Low-temperature synthesis of fluorapatite/fluorohydroxyapatite with precursor mixture previously mechanochemically treated is described in this article. Ethylene vinylacetate/versatate copolymer as a surface active substance was mechanically treated to obtain a core-shell system with strongly controlled grain size. Despite usual behavior of mechanically activated systems, only an amorphous phase formed from precursor ions present in the mixture composed of -Ca2P2O7, CaCO3, CaF2, and unreacted Ca(OH)(2) was obtained during milling for 5min to 8h. The mixture contained depots of labile F- ions conserved in micelles cages, which are useful for teeth protection from carries. For transformation of these amorphous phases into fluorapatite, an additional low thermal treatment was necessary. The mechanism of the precursor mixture transformation into fluorapatite during milling and thermal treatment was investigated using FTIR spectroscopy and X-ray diffraction. The morphology and size distribution of the obtained powders was studied using SEM and TEM.",
journal = "International Journal of Applied Ceramic Technology",
title = "Mechanochemical and Low-Temperature Synthesis of Nanocrystalline Fluorohydroxyapatite/Fluorapatite",
volume = "10",
number = "6",
pages = "957-969",
doi = "10.1111/j.1744-7402.2012.02821.x"
}

Jokanović, V. R., Čolović, B. M., Jović, N. G., Babić-Stojić, B. S.,& Jokanović, B.. (2013). Mechanochemical and Low-Temperature Synthesis of Nanocrystalline Fluorohydroxyapatite/Fluorapatite. in International Journal of Applied Ceramic Technology, 10(6), 957-969.
https://doi.org/10.1111/j.1744-7402.2012.02821.x

Jokanović VR, Čolović BM, Jović NG, Babić-Stojić BS, Jokanović B. Mechanochemical and Low-Temperature Synthesis of Nanocrystalline Fluorohydroxyapatite/Fluorapatite. in International Journal of Applied Ceramic Technology. 2013;10(6):957-969.
doi:10.1111/j.1744-7402.2012.02821.x .

Jokanović, Vukoman R., Čolović, Božana M., Jović, Nataša G., Babić-Stojić, Branka S., Jokanović, Bojan, "Mechanochemical and Low-Temperature Synthesis of Nanocrystalline Fluorohydroxyapatite/Fluorapatite" in International Journal of Applied Ceramic Technology, 10, no. 6 (2013):957-969,
https://doi.org/10.1111/j.1744-7402.2012.02821.x . .

TY  - JOUR
AU  - Čolović, Božana M.
AU  - Jokanović, Vukoman R.
AU  - Jović, Nataša G.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6081
AB  - The synthesis of active silicate phases by combined sol gel and high-temperature self-propagating wave method, is described in this paper. They show a significant decrease of setting time and good mechanical properties, which are very important for its potential application in endodontic practice. Particularly, process of hydration of calcium silicate phases is carefully analyzed, from the aspect of phase changes during their soaking in water for 1, 3, 7 and 28 days. XRD and FTIR methods were used for phase analysis of all samples, while morphological characteristics and chemical composition of the given phases were investigated by SEM and EDS.
T2  - Science of Sintering
T1  - Creating of Highly Active Calcium-Silicate Phases for Application in Endodontics
VL  - 45
IS  - 3
SP  - 341
EP  - 350
DO  - 10.2298/SOS1303341C
ER  - 

@article{
author = "Čolović, Božana M. and Jokanović, Vukoman R. and Jović, Nataša G.",
year = "2013",
abstract = "The synthesis of active silicate phases by combined sol gel and high-temperature self-propagating wave method, is described in this paper. They show a significant decrease of setting time and good mechanical properties, which are very important for its potential application in endodontic practice. Particularly, process of hydration of calcium silicate phases is carefully analyzed, from the aspect of phase changes during their soaking in water for 1, 3, 7 and 28 days. XRD and FTIR methods were used for phase analysis of all samples, while morphological characteristics and chemical composition of the given phases were investigated by SEM and EDS.",
journal = "Science of Sintering",
title = "Creating of Highly Active Calcium-Silicate Phases for Application in Endodontics",
volume = "45",
number = "3",
pages = "341-350",
doi = "10.2298/SOS1303341C"
}

Čolović, B. M., Jokanović, V. R.,& Jović, N. G.. (2013). Creating of Highly Active Calcium-Silicate Phases for Application in Endodontics. in Science of Sintering, 45(3), 341-350.
https://doi.org/10.2298/SOS1303341C

Čolović BM, Jokanović VR, Jović NG. Creating of Highly Active Calcium-Silicate Phases for Application in Endodontics. in Science of Sintering. 2013;45(3):341-350.
doi:10.2298/SOS1303341C .

Čolović, Božana M., Jokanović, Vukoman R., Jović, Nataša G., "Creating of Highly Active Calcium-Silicate Phases for Application in Endodontics" in Science of Sintering, 45, no. 3 (2013):341-350,
https://doi.org/10.2298/SOS1303341C . .

TY  - JOUR
AU  - Nikolić, Aleksandar S.
AU  - Jović, Nataša G.
AU  - Rogan, Jelena R.
AU  - Kremenović, Aleksandar S.
AU  - Ristić, Mira
AU  - Meden, A.
AU  - Antić, Bratislav
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5544
AB  - Different synthesis methods for the preparation of nanocrystalline nickel ferrites are reported: the thermal decomposition of precursors, made of: (i) metal-nitrate salts with carboxylic acids (citric, malonic and tartaric), and (ii) metal-nitrate salts and polyethylene glycol (PEG), in the presence of potassium chloride as a capping agent. The as-prepared gel precursors were characterized by TGA/DTA, while the samples obtained after annealing at 450 degrees C were investigated by FTIR, FESEM, XRD and Mossbauer spectroscopy. Regardless of the type of carboxylic acid used, nanocrystallites prepared by (i) method are similar in size (11-16 nm), while the method (ii) gives crystallites similar to 33 nm in size with negligible microstrain. The differences in the lattice parameter, ranging from 8.3369(2) to 8.3574(2) angstrom, result from cation distribution, nonstoichiometry and structural imperfections in the nickel ferrite nanoparticles. The Mossbauer spectra analysis indicates existence of large distortions of tetrahedral and octahedral sites in these spinel compounds. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites
VL  - 39
IS  - 6
SP  - 6681
EP  - 6688
DO  - 10.1016/j.ceramint.2013.01.106
ER  - 

@article{
author = "Nikolić, Aleksandar S. and Jović, Nataša G. and Rogan, Jelena R. and Kremenović, Aleksandar S. and Ristić, Mira and Meden, A. and Antić, Bratislav",
year = "2013",
abstract = "Different synthesis methods for the preparation of nanocrystalline nickel ferrites are reported: the thermal decomposition of precursors, made of: (i) metal-nitrate salts with carboxylic acids (citric, malonic and tartaric), and (ii) metal-nitrate salts and polyethylene glycol (PEG), in the presence of potassium chloride as a capping agent. The as-prepared gel precursors were characterized by TGA/DTA, while the samples obtained after annealing at 450 degrees C were investigated by FTIR, FESEM, XRD and Mossbauer spectroscopy. Regardless of the type of carboxylic acid used, nanocrystallites prepared by (i) method are similar in size (11-16 nm), while the method (ii) gives crystallites similar to 33 nm in size with negligible microstrain. The differences in the lattice parameter, ranging from 8.3369(2) to 8.3574(2) angstrom, result from cation distribution, nonstoichiometry and structural imperfections in the nickel ferrite nanoparticles. The Mossbauer spectra analysis indicates existence of large distortions of tetrahedral and octahedral sites in these spinel compounds. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites",
volume = "39",
number = "6",
pages = "6681-6688",
doi = "10.1016/j.ceramint.2013.01.106"
}

Nikolić, A. S., Jović, N. G., Rogan, J. R., Kremenović, A. S., Ristić, M., Meden, A.,& Antić, B.. (2013). Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites. in Ceramics International, 39(6), 6681-6688.
https://doi.org/10.1016/j.ceramint.2013.01.106

Nikolić AS, Jović NG, Rogan JR, Kremenović AS, Ristić M, Meden A, Antić B. Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites. in Ceramics International. 2013;39(6):6681-6688.
doi:10.1016/j.ceramint.2013.01.106 .

Nikolić, Aleksandar S., Jović, Nataša G., Rogan, Jelena R., Kremenović, Aleksandar S., Ristić, Mira, Meden, A., Antić, Bratislav, "Carboxylic acids and polyethylene glycol assisted synthesis of nanocrystalline nickel ferrites" in Ceramics International, 39, no. 6 (2013):6681-6688,
https://doi.org/10.1016/j.ceramint.2013.01.106 . .

TY  - JOUR
AU  - Jović, Nataša G.
AU  - Cvjetićanin, Nikola
AU  - Babić-Stojić, Branka S.
AU  - Makovec, Darko
AU  - Jokanović, Vukoman R.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5499
AB  - alpha-Fe2O3 nanospheres with diameters of 20-40 nm and FeOOH nanorods with diameters of 150-200 nm and lengths of 0.5-1.0 mu m were synthesized via hydrolysis of Fe(NO3)(3) and FeCl3 solutions, respectively, in the presence of urea and oleic acid, under reflux at temperature similar to 90 degrees C for 8 h. The molar ratio of Fe3+ ions and urea were changed until pure phases have been obtained. The key parameter of the synthesis which provides pure hematite and beta-FeOOH phases was the pH. The samples were characterized by X-ray powder diffraction, transmission electron microscopy and Mossbauer spectroscopy. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis of hematite and iron oxyhydroxide nanocrystals by precipitation of Fe3+ ions inside oleic acid micelles
VL  - 39
IS  - 5
SP  - 5659
EP  - 5665
DO  - 10.1016/j.ceramint.2012.12.082
ER  - 

@article{
author = "Jović, Nataša G. and Cvjetićanin, Nikola and Babić-Stojić, Branka S. and Makovec, Darko and Jokanović, Vukoman R.",
year = "2013",
abstract = "alpha-Fe2O3 nanospheres with diameters of 20-40 nm and FeOOH nanorods with diameters of 150-200 nm and lengths of 0.5-1.0 mu m were synthesized via hydrolysis of Fe(NO3)(3) and FeCl3 solutions, respectively, in the presence of urea and oleic acid, under reflux at temperature similar to 90 degrees C for 8 h. The molar ratio of Fe3+ ions and urea were changed until pure phases have been obtained. The key parameter of the synthesis which provides pure hematite and beta-FeOOH phases was the pH. The samples were characterized by X-ray powder diffraction, transmission electron microscopy and Mossbauer spectroscopy. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis of hematite and iron oxyhydroxide nanocrystals by precipitation of Fe3+ ions inside oleic acid micelles",
volume = "39",
number = "5",
pages = "5659-5665",
doi = "10.1016/j.ceramint.2012.12.082"
}

Jović, N. G., Cvjetićanin, N., Babić-Stojić, B. S., Makovec, D.,& Jokanović, V. R.. (2013). Synthesis of hematite and iron oxyhydroxide nanocrystals by precipitation of Fe3+ ions inside oleic acid micelles. in Ceramics International, 39(5), 5659-5665.
https://doi.org/10.1016/j.ceramint.2012.12.082

Jović NG, Cvjetićanin N, Babić-Stojić BS, Makovec D, Jokanović VR. Synthesis of hematite and iron oxyhydroxide nanocrystals by precipitation of Fe3+ ions inside oleic acid micelles. in Ceramics International. 2013;39(5):5659-5665.
doi:10.1016/j.ceramint.2012.12.082 .

Jović, Nataša G., Cvjetićanin, Nikola, Babić-Stojić, Branka S., Makovec, Darko, Jokanović, Vukoman R., "Synthesis of hematite and iron oxyhydroxide nanocrystals by precipitation of Fe3+ ions inside oleic acid micelles" in Ceramics International, 39, no. 5 (2013):5659-5665,
https://doi.org/10.1016/j.ceramint.2012.12.082 . .

TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Branković, Dušan
AU  - Jović, Nataša G.
AU  - Čupić, Svetlana D.
AU  - Kojić, Dušan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4909
AB  - Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol-gel technique. Samples with various mass fractions of Co1+yAl2-yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2-yO4 in SiO2, showed very similar Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta a parts per thousand -100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.
T2  - Journal of Sol-gel Science and Technology
T1  - Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method
VL  - 63
IS  - 1
SP  - 56
EP  - 64
DO  - 10.1007/s10971-012-2763-1
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Branković, Dušan and Jović, Nataša G. and Čupić, Svetlana D. and Kojić, Dušan",
year = "2012",
abstract = "Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol-gel technique. Samples with various mass fractions of Co1+yAl2-yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2-yO4 in SiO2, showed very similar Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta a parts per thousand -100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.",
journal = "Journal of Sol-gel Science and Technology",
title = "Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method",
volume = "63",
number = "1",
pages = "56-64",
doi = "10.1007/s10971-012-2763-1"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Branković, D., Jović, N. G., Čupić, S. D.,& Kojić, D.. (2012). Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method. in Journal of Sol-gel Science and Technology, 63(1), 56-64.
https://doi.org/10.1007/s10971-012-2763-1

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Branković D, Jović NG, Čupić SD, Kojić D. Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method. in Journal of Sol-gel Science and Technology. 2012;63(1):56-64.
doi:10.1007/s10971-012-2763-1 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Branković, Dušan, Jović, Nataša G., Čupić, Svetlana D., Kojić, Dušan, "Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method" in Journal of Sol-gel Science and Technology, 63, no. 1 (2012):56-64,
https://doi.org/10.1007/s10971-012-2763-1 . .

TY  - JOUR
AU  - Jović, Nataša G.
AU  - Prekajski, Marija D.
AU  - Kremenović, Aleksandar S.
AU  - Jančar, Boštjan
AU  - Kahlenberg, V.
AU  - Antić, Bratislav
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4721
AB  - alpha-lithium ferrite (Li0.5Fe2.5O4) nanoparticles have been prepared using two synthesis routes: citrate gel decomposition as well as the Pechini method. Analysis of HRTEM images of the particles showed that they have a core/shell structure, an average size of similar to 10 nm and stacking faults parallel to the (110) planes. In both samples, the distribution of the Li and Fe cations was found to be partially ordered on the octahedral sites (Wyckoff positions 4b and 12d of space group P4(3)32). According to literature data, Li0.5Fe2.5O4 should adopt a disordered spinel structure (so called beta-phase, space group Fd (3) over barm) for crystallites of 10 nm or less in size. In this study it is shown that (a) the symmetry of the Li0.5Fe2.5O4 nanoparticles depends on the degree of their crystallinity and (b) the ordered crystal structures can be formed even for crystallites of 5-6 nm in size. By fitting the room temperature Mossbauer spectra it was obtained that the hyperfine field values are lower in the sample synthesized by the Pechini method. The Pechini process probably resulted in larger distortions of the cation environments than the citrate gel decomposition method. The saturation magnetization in turn was higher for the material obtained by the gel decomposition approach. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684554]
T2  - Journal of Applied Physics
T1  - Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles
VL  - 111
IS  - 3
DO  - 10.1063/1.3684554
ER  - 

@article{
author = "Jović, Nataša G. and Prekajski, Marija D. and Kremenović, Aleksandar S. and Jančar, Boštjan and Kahlenberg, V. and Antić, Bratislav",
year = "2012",
abstract = "alpha-lithium ferrite (Li0.5Fe2.5O4) nanoparticles have been prepared using two synthesis routes: citrate gel decomposition as well as the Pechini method. Analysis of HRTEM images of the particles showed that they have a core/shell structure, an average size of similar to 10 nm and stacking faults parallel to the (110) planes. In both samples, the distribution of the Li and Fe cations was found to be partially ordered on the octahedral sites (Wyckoff positions 4b and 12d of space group P4(3)32). According to literature data, Li0.5Fe2.5O4 should adopt a disordered spinel structure (so called beta-phase, space group Fd (3) over barm) for crystallites of 10 nm or less in size. In this study it is shown that (a) the symmetry of the Li0.5Fe2.5O4 nanoparticles depends on the degree of their crystallinity and (b) the ordered crystal structures can be formed even for crystallites of 5-6 nm in size. By fitting the room temperature Mossbauer spectra it was obtained that the hyperfine field values are lower in the sample synthesized by the Pechini method. The Pechini process probably resulted in larger distortions of the cation environments than the citrate gel decomposition method. The saturation magnetization in turn was higher for the material obtained by the gel decomposition approach. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684554]",
journal = "Journal of Applied Physics",
title = "Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles",
volume = "111",
number = "3",
doi = "10.1063/1.3684554"
}

Jović, N. G., Prekajski, M. D., Kremenović, A. S., Jančar, B., Kahlenberg, V.,& Antić, B.. (2012). Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles. in Journal of Applied Physics, 111(3).
https://doi.org/10.1063/1.3684554

Jović NG, Prekajski MD, Kremenović AS, Jančar B, Kahlenberg V, Antić B. Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles. in Journal of Applied Physics. 2012;111(3).
doi:10.1063/1.3684554 .

Jović, Nataša G., Prekajski, Marija D., Kremenović, Aleksandar S., Jančar, Boštjan, Kahlenberg, V., Antić, Bratislav, "Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles" in Journal of Applied Physics, 111, no. 3 (2012),
https://doi.org/10.1063/1.3684554 . .