Modifikacija, sinteza i analiza nanostrukturnih materijala jonskim snopovima, gama zračenjem i vakuumskim deponovanjem

Link to this page

info:eu-repo/grantAgreement/MESTD/MPN2006-2010/141013/RS//

Modifikacija, sinteza i analiza nanostrukturnih materijala jonskim snopovima, gama zračenjem i vakuumskim deponovanjem (en)
Модификација, синтеза и анализа наноструктурних материјала јонским сноповима, гама зрачењем и вакуумским депоновањем (sr)
Modifikacija, sinteza i analiza nanostrukturnih materijala jonskim snopovima, gama zračenjem i vakuumskim deponovanjem (sr_RS)
Authors

Publications

Ion-beam irradiation effects on reactively sputtered CrN layers

Novaković, Mirjana M.; Popović, Maja; Bibić, Nataša M.

(2011)

TY  - JOUR
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Bibić, Nataša M.
PY  - 2011
UR  - https://doaj.org/article/e0d5a6877a4c44e58de76121026415e7
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7703
AB  - This paper presents a study of microstructural changes induced in CrN layers by irradiation with 120 keV argon ions. The layers were deposited on (100) Si wafers, at different nitrogen partial pressures (2×10^-4, 3.5×10^-4 and 5×10^-4 mbar), to a total thickness of 260–280 nm. During deposition the substrates were held at 150°C. After deposition the samples were irradiated with argon ions to the fluences of 1×10^15 and 1×10^16 ions/cm2, under the vacuum of 7×10^-6 mbar. Characterisation of the samples structure and morphology were performed by X-ray diffraction (XRD) analysis and cross-sectional transmission electron microscopy (XTEM), and the concentration profiles were determined by Rutheford backscattering (RBS) spectrometry. It was found that the layer composition strongly depends on the nitrogen partial pressure during deposition. A pure stoichiometric CrN phase was achieved for the highest nitrogen partial pressure (5×10^-4 mbar). Argon ions irradiation induces microstructural changes in the CrN layers such as variation of the lattice constants, micro-strain and mean grain size.
T2  - Processing and Application of Ceramics
T1  - Ion-beam irradiation effects on reactively sputtered CrN layers
VL  - 5
IS  - 1
SP  - 25
EP  - 29
DO  - 10.2298/PAC1101025N
ER  - 
@article{
author = "Novaković, Mirjana M. and Popović, Maja and Bibić, Nataša M.",
year = "2011",
abstract = "This paper presents a study of microstructural changes induced in CrN layers by irradiation with 120 keV argon ions. The layers were deposited on (100) Si wafers, at different nitrogen partial pressures (2×10^-4, 3.5×10^-4 and 5×10^-4 mbar), to a total thickness of 260–280 nm. During deposition the substrates were held at 150°C. After deposition the samples were irradiated with argon ions to the fluences of 1×10^15 and 1×10^16 ions/cm2, under the vacuum of 7×10^-6 mbar. Characterisation of the samples structure and morphology were performed by X-ray diffraction (XRD) analysis and cross-sectional transmission electron microscopy (XTEM), and the concentration profiles were determined by Rutheford backscattering (RBS) spectrometry. It was found that the layer composition strongly depends on the nitrogen partial pressure during deposition. A pure stoichiometric CrN phase was achieved for the highest nitrogen partial pressure (5×10^-4 mbar). Argon ions irradiation induces microstructural changes in the CrN layers such as variation of the lattice constants, micro-strain and mean grain size.",
journal = "Processing and Application of Ceramics",
title = "Ion-beam irradiation effects on reactively sputtered CrN layers",
volume = "5",
number = "1",
pages = "25-29",
doi = "10.2298/PAC1101025N"
}
Novaković, M. M., Popović, M.,& Bibić, N. M.. (2011). Ion-beam irradiation effects on reactively sputtered CrN layers. in Processing and Application of Ceramics, 5(1), 25-29.
https://doi.org/10.2298/PAC1101025N
Novaković MM, Popović M, Bibić NM. Ion-beam irradiation effects on reactively sputtered CrN layers. in Processing and Application of Ceramics. 2011;5(1):25-29.
doi:10.2298/PAC1101025N .
Novaković, Mirjana M., Popović, Maja, Bibić, Nataša M., "Ion-beam irradiation effects on reactively sputtered CrN layers" in Processing and Application of Ceramics, 5, no. 1 (2011):25-29,
https://doi.org/10.2298/PAC1101025N . .
1

Structural changes induced by argon ion irradiation in TiN thin films

Popović, Maja; Novaković, Mirjana M.; Rakočević, Zlatko Lj.; Bibić, Nataša M.

(2011)

TY  - JOUR
AU  - Popović, Maja
AU  - Novaković, Mirjana M.
AU  - Rakočević, Zlatko Lj.
AU  - Bibić, Nataša M.
PY  - 2011
UR  - https://doaj.org/article/dc9f3939725e4c5f8759a8d53940e662
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7704
AB  - In this work, the effects of 120 keV Ar+ ion implantation on the structural properties of TiN thin films were investigated. TiN layers were deposited by d.c. reactive sputtering on Si(100) wafers at room temperature or at 150°C. The thickness of TiN layers was ~240 nm. After deposition the samples were irradiated with 120 keV argon ions to the fluencies of 1×10^15 and 1×10^16 ions/cm2. Structural characterisation was performed with Rutherford backscattering spectroscopy (RBS), cross-sectional transmission electron microscopy (XTEM), grazing angle X-ray diffraction (XRD) and atomic force microscopy (AFM). It was found that the argon ion irradiation induced the changes in the lattice constant, mean grain size, micro-strain and surface morphology of the TiN layers. The observed micro-structural changes are due to the formation of the high density damage region in the TiN thin film structure.
T2  - Processing and Application of Ceramics
T1  - Structural changes induced by argon ion irradiation in TiN thin films
VL  - 5
IS  - 1
SP  - 19
EP  - 23
DO  - 10.2298/PAC1101019P
ER  - 
@article{
author = "Popović, Maja and Novaković, Mirjana M. and Rakočević, Zlatko Lj. and Bibić, Nataša M.",
year = "2011",
abstract = "In this work, the effects of 120 keV Ar+ ion implantation on the structural properties of TiN thin films were investigated. TiN layers were deposited by d.c. reactive sputtering on Si(100) wafers at room temperature or at 150°C. The thickness of TiN layers was ~240 nm. After deposition the samples were irradiated with 120 keV argon ions to the fluencies of 1×10^15 and 1×10^16 ions/cm2. Structural characterisation was performed with Rutherford backscattering spectroscopy (RBS), cross-sectional transmission electron microscopy (XTEM), grazing angle X-ray diffraction (XRD) and atomic force microscopy (AFM). It was found that the argon ion irradiation induced the changes in the lattice constant, mean grain size, micro-strain and surface morphology of the TiN layers. The observed micro-structural changes are due to the formation of the high density damage region in the TiN thin film structure.",
journal = "Processing and Application of Ceramics",
title = "Structural changes induced by argon ion irradiation in TiN thin films",
volume = "5",
number = "1",
pages = "19-23",
doi = "10.2298/PAC1101019P"
}
Popović, M., Novaković, M. M., Rakočević, Z. Lj.,& Bibić, N. M.. (2011). Structural changes induced by argon ion irradiation in TiN thin films. in Processing and Application of Ceramics, 5(1), 19-23.
https://doi.org/10.2298/PAC1101019P
Popović M, Novaković MM, Rakočević ZL, Bibić NM. Structural changes induced by argon ion irradiation in TiN thin films. in Processing and Application of Ceramics. 2011;5(1):19-23.
doi:10.2298/PAC1101019P .
Popović, Maja, Novaković, Mirjana M., Rakočević, Zlatko Lj., Bibić, Nataša M., "Structural changes induced by argon ion irradiation in TiN thin films" in Processing and Application of Ceramics, 5, no. 1 (2011):19-23,
https://doi.org/10.2298/PAC1101019P . .
2

Influence of Thermal Memory on the Thermoelastic Bending Component of Photoacoustic Response

Nešić, Mioljub V.; Popović, Marica N.; Galović, Slobodanka

(2011)

TY  - JOUR
AU  - Nešić, Mioljub V.
AU  - Popović, Marica N.
AU  - Galović, Slobodanka
PY  - 2011
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4574
AB  - In this work, the thermoelastic component of the photoacoustic response is derived, including the thermal memory of the material. The comparison between this model and the classic one, which does not account for the influence of thermal memory is made. It has been noticed that the two models tend to overlap at very high and very low frequencies of the light modulation spectrum, while in the middle range some deviations become more apparent, which proves that thermal memory must be taken into account. It has also been shown that the limits of this range are the function of heat propagation velocity and thickness of the sample. Based upon the processing of obtained data, it has been concluded that the characteristics of the output signal, in the range of the interest, are highly influenced by thermal dynamic qualities, like heat diffusivity and thermal relaxation time, as well as the sample thickness.
T2  - Hemijska industrija
T1  - Influence of Thermal Memory on the Thermoelastic Bending Component of Photoacoustic Response
VL  - 65
IS  - 3
SP  - 219
EP  - 227
DO  - 10.2298/HEMIND110209021N
ER  - 
@article{
author = "Nešić, Mioljub V. and Popović, Marica N. and Galović, Slobodanka",
year = "2011",
abstract = "In this work, the thermoelastic component of the photoacoustic response is derived, including the thermal memory of the material. The comparison between this model and the classic one, which does not account for the influence of thermal memory is made. It has been noticed that the two models tend to overlap at very high and very low frequencies of the light modulation spectrum, while in the middle range some deviations become more apparent, which proves that thermal memory must be taken into account. It has also been shown that the limits of this range are the function of heat propagation velocity and thickness of the sample. Based upon the processing of obtained data, it has been concluded that the characteristics of the output signal, in the range of the interest, are highly influenced by thermal dynamic qualities, like heat diffusivity and thermal relaxation time, as well as the sample thickness.",
journal = "Hemijska industrija",
title = "Influence of Thermal Memory on the Thermoelastic Bending Component of Photoacoustic Response",
volume = "65",
number = "3",
pages = "219-227",
doi = "10.2298/HEMIND110209021N"
}
Nešić, M. V., Popović, M. N.,& Galović, S.. (2011). Influence of Thermal Memory on the Thermoelastic Bending Component of Photoacoustic Response. in Hemijska industrija, 65(3), 219-227.
https://doi.org/10.2298/HEMIND110209021N
Nešić MV, Popović MN, Galović S. Influence of Thermal Memory on the Thermoelastic Bending Component of Photoacoustic Response. in Hemijska industrija. 2011;65(3):219-227.
doi:10.2298/HEMIND110209021N .
Nešić, Mioljub V., Popović, Marica N., Galović, Slobodanka, "Influence of Thermal Memory on the Thermoelastic Bending Component of Photoacoustic Response" in Hemijska industrija, 65, no. 3 (2011):219-227,
https://doi.org/10.2298/HEMIND110209021N . .
2
3
3

Ion-beam irradiation effects on reactively sputtered CrN thin films

Novaković, Mirjana M.; Popović, Maja; Bibić, Nataša M.

(2010)

TY  - JOUR
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Bibić, Nataša M.
PY  - 2010
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/6886
AB  - The present study deals with CrN/Si bilayers irradiated at room temperature (RI) with 120 keV Ar ions. The CrN layers were deposited by d.c. reactive sputtering on Si(1 0 0) wafers, at different nitrogen partial pressures (2 x 10(-4), 3.5 x 10(-4) and 5 x 10(-4) mbar), to a total thickness of 240-280 nm. The substrates were held at room temperature (RI) or 150 degrees C during deposition. After deposition the CrN/Si bilayers were irradiated up to fluences of 1 x 10(15) and 1 x 10(16) ions/cm(2). Structural characterization was performed with Rutherford backscattering spectroscopy (RBS), cross-sectional transmission electron microscopy (XTEM) and grazing angle X-ray diffraction (XRD). For the highest nitrogen pressure (5 x 10(-4) mbar) a pure stoichiometric CrN phase was achieved. The results showed that Ar ion irradiation resulted in the variation of the lattice constants, micro-strain and mean grain size of the CrN layers. The observed microstructural changes are due to the formation of the high density damage region in the CrN thin film structure. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
T1  - Ion-beam irradiation effects on reactively sputtered CrN thin films
VL  - 268
IS  - 19
SP  - 2883
EP  - 2887
DO  - 10.1016/j.nimb.2010.03.027
ER  - 
@article{
author = "Novaković, Mirjana M. and Popović, Maja and Bibić, Nataša M.",
year = "2010",
abstract = "The present study deals with CrN/Si bilayers irradiated at room temperature (RI) with 120 keV Ar ions. The CrN layers were deposited by d.c. reactive sputtering on Si(1 0 0) wafers, at different nitrogen partial pressures (2 x 10(-4), 3.5 x 10(-4) and 5 x 10(-4) mbar), to a total thickness of 240-280 nm. The substrates were held at room temperature (RI) or 150 degrees C during deposition. After deposition the CrN/Si bilayers were irradiated up to fluences of 1 x 10(15) and 1 x 10(16) ions/cm(2). Structural characterization was performed with Rutherford backscattering spectroscopy (RBS), cross-sectional transmission electron microscopy (XTEM) and grazing angle X-ray diffraction (XRD). For the highest nitrogen pressure (5 x 10(-4) mbar) a pure stoichiometric CrN phase was achieved. The results showed that Ar ion irradiation resulted in the variation of the lattice constants, micro-strain and mean grain size of the CrN layers. The observed microstructural changes are due to the formation of the high density damage region in the CrN thin film structure. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
title = "Ion-beam irradiation effects on reactively sputtered CrN thin films",
volume = "268",
number = "19",
pages = "2883-2887",
doi = "10.1016/j.nimb.2010.03.027"
}
Novaković, M. M., Popović, M.,& Bibić, N. M.. (2010). Ion-beam irradiation effects on reactively sputtered CrN thin films. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 268(19), 2883-2887.
https://doi.org/10.1016/j.nimb.2010.03.027
Novaković MM, Popović M, Bibić NM. Ion-beam irradiation effects on reactively sputtered CrN thin films. in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 2010;268(19):2883-2887.
doi:10.1016/j.nimb.2010.03.027 .
Novaković, Mirjana M., Popović, Maja, Bibić, Nataša M., "Ion-beam irradiation effects on reactively sputtered CrN thin films" in Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 268, no. 19 (2010):2883-2887,
https://doi.org/10.1016/j.nimb.2010.03.027 . .
10
11
13

The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation

Miličević, Dejan S.; Trifunovic, Sasa B.; Mudrinic, Tihana M.; Leskovac, Andreja; Ignjatović, Nenad L.; Dojčilović, Jablan R.; Suljovrujić, Edin H.

(2010)

TY  - JOUR
AU  - Miličević, Dejan S.
AU  - Trifunovic, Sasa B.
AU  - Mudrinic, Tihana M.
AU  - Leskovac, Andreja
AU  - Ignjatović, Nenad L.
AU  - Dojčilović, Jablan R.
AU  - Suljovrujić, Edin H.
PY  - 2010
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4121
AB  - The influence of gamma radiation on the structure and glass transition behaviour of poly-L-lactide (PLLA) has been studied. Since PLLA exposed to high-energy radiation in the presence of air is prone to chain scission reactions and large degradation, changes in molecular weight were obtained by the gel permeation chromatography (GPC). Alterations in the glass transition behaviour were investigated by differential scanning calorimetry (DSC). The apparent activation energy, Delta H*, for the glass transition was determined on the basis of the heating rate dependence of the glass transition temperature, T(g). Our findings support the fact that chain scission is the main reason for the decrease of Tg and Delta H* with the absorbed dose. At low doses, despite large changes in molecular weight, only small alterations are observed in the glass transition temperature and apparent activation energy. Further increase in the absorbed dose introduces not only significant changes in the molecular weight but also in the glass transition temperature and the activation energy. Such glass transition behaviour is a manifestation of a well-known effect of molecular weight on Tg, postulated by the Fox-Flory equation. However, all the observed alterations are small and tolerable at absorbed doses required for sterilization (up to 25 kGy in most circumstances). Furthermore, this study reveals that the radiation-induced changes in the molecular weight and the glass transition temperature occur in a predictable and fairly accurate manner. Therefore, gamma radiation can be used not only for sterilization but also for tailoring desirable end-use properties of PLLA based implants.
T2  - Hemijska industrija
T1  - The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation
VL  - 64
IS  - 4
SP  - 275
EP  - 281
DO  - 10.2298/HEMIND100329020M
ER  - 
@article{
author = "Miličević, Dejan S. and Trifunovic, Sasa B. and Mudrinic, Tihana M. and Leskovac, Andreja and Ignjatović, Nenad L. and Dojčilović, Jablan R. and Suljovrujić, Edin H.",
year = "2010",
abstract = "The influence of gamma radiation on the structure and glass transition behaviour of poly-L-lactide (PLLA) has been studied. Since PLLA exposed to high-energy radiation in the presence of air is prone to chain scission reactions and large degradation, changes in molecular weight were obtained by the gel permeation chromatography (GPC). Alterations in the glass transition behaviour were investigated by differential scanning calorimetry (DSC). The apparent activation energy, Delta H*, for the glass transition was determined on the basis of the heating rate dependence of the glass transition temperature, T(g). Our findings support the fact that chain scission is the main reason for the decrease of Tg and Delta H* with the absorbed dose. At low doses, despite large changes in molecular weight, only small alterations are observed in the glass transition temperature and apparent activation energy. Further increase in the absorbed dose introduces not only significant changes in the molecular weight but also in the glass transition temperature and the activation energy. Such glass transition behaviour is a manifestation of a well-known effect of molecular weight on Tg, postulated by the Fox-Flory equation. However, all the observed alterations are small and tolerable at absorbed doses required for sterilization (up to 25 kGy in most circumstances). Furthermore, this study reveals that the radiation-induced changes in the molecular weight and the glass transition temperature occur in a predictable and fairly accurate manner. Therefore, gamma radiation can be used not only for sterilization but also for tailoring desirable end-use properties of PLLA based implants.",
journal = "Hemijska industrija",
title = "The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation",
volume = "64",
number = "4",
pages = "275-281",
doi = "10.2298/HEMIND100329020M"
}
Miličević, D. S., Trifunovic, S. B., Mudrinic, T. M., Leskovac, A., Ignjatović, N. L., Dojčilović, J. R.,& Suljovrujić, E. H.. (2010). The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation. in Hemijska industrija, 64(4), 275-281.
https://doi.org/10.2298/HEMIND100329020M
Miličević DS, Trifunovic SB, Mudrinic TM, Leskovac A, Ignjatović NL, Dojčilović JR, Suljovrujić EH. The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation. in Hemijska industrija. 2010;64(4):275-281.
doi:10.2298/HEMIND100329020M .
Miličević, Dejan S., Trifunovic, Sasa B., Mudrinic, Tihana M., Leskovac, Andreja, Ignjatović, Nenad L., Dojčilović, Jablan R., Suljovrujić, Edin H., "The Structure and Glass Transition Behaviour of Plla under the Influence of Gamma Radiation" in Hemijska industrija, 64, no. 4 (2010):275-281,
https://doi.org/10.2298/HEMIND100329020M . .

Properties of Isotactic Polypropylene Irradiated in Various Atmospheres

Miličević, Dejan S.; Suljovrujić, Edin H.

(2010)

TY  - JOUR
AU  - Miličević, Dejan S.
AU  - Suljovrujić, Edin H.
PY  - 2010
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4051
AB  - In this paper, changes in structure and physical properties of stabilized isotactic polypropylene (iPP) were created by gamma irradiation, up to a dose of 700 kGy, in different media: air, deionized distilled (DD) water and acetylene. Two main effects occur when polyolefins, such as iPP, are subjected to ionizing radiation: crosslinking and scission of macromolecules. The domination of one or the other of these competitive processes is determined by both the structural peculiarities of the polymers and the experimental irradiation conditions. Gel and infrared (IR) spectroscopy measurements were used to determine the changes in the degree of network formation and oxidative degradation, respectively. Sol gel analysis was studied in detail using the Charlesby-Pinner (C-P) equation. The radiation-induced changes in the structure and evolution of oxygen-containing species were also studied through dielectric loss (tan delta) analysis in a wide temperature and/or frequency range. Evolution of low temperature dielectric relaxations with gamma irradiation was investigated. The results showed that degradation was the major reaction in the initial step of irradiation, no matter what the atmosphere was. The C-P equation seemed applicable when stabilized iPP was irradiated within a certain dose range in various atmospheres. The iPP irradiated in acetylene/air had the lowest/highest values for oxidation level, dielectric losses, D(g) and G(s)/G(x) values. The calculated D(g) values are 1.5 and 5 times larger for the irradiation in DD water and air than for the acetylene. Furthermore, our data confirm that oxidation strongly affects the gel point but has a much lower effect on the G(s)/G(x) ratio. In the case of dielectric relaxation measurements, the connection between the oxidative degradation and dielectric properties is well established and is in good agreement with IR spectroscopy measurements. The amount of carbonyl, hydroperoxide and other polar groups is much higher for the irradiation in air than in other media, leading to higher dielectric losses. Disappearance of low temperature (delta and gamma) relaxations with gamma radiation confirmed great sensitivity of iPP structure to radiation-induced changes. Complete vanishing of the gamma relaxation in iPP samples irradiated in air is connected with a large radiation-induced oxidative degradation in this medium. Similar crosslinking, oxidation and dielectric behaviour was observed for the samples irradiated in water and acetylene, indicating DD water as a good crosslinking medium.
T2  - Hemijska industrija
T1  - Properties of Isotactic Polypropylene Irradiated in Various Atmospheres
VL  - 64
IS  - 3
SP  - 201
EP  - 208
DO  - 10.2298/HEMIND091221029M
ER  - 
@article{
author = "Miličević, Dejan S. and Suljovrujić, Edin H.",
year = "2010",
abstract = "In this paper, changes in structure and physical properties of stabilized isotactic polypropylene (iPP) were created by gamma irradiation, up to a dose of 700 kGy, in different media: air, deionized distilled (DD) water and acetylene. Two main effects occur when polyolefins, such as iPP, are subjected to ionizing radiation: crosslinking and scission of macromolecules. The domination of one or the other of these competitive processes is determined by both the structural peculiarities of the polymers and the experimental irradiation conditions. Gel and infrared (IR) spectroscopy measurements were used to determine the changes in the degree of network formation and oxidative degradation, respectively. Sol gel analysis was studied in detail using the Charlesby-Pinner (C-P) equation. The radiation-induced changes in the structure and evolution of oxygen-containing species were also studied through dielectric loss (tan delta) analysis in a wide temperature and/or frequency range. Evolution of low temperature dielectric relaxations with gamma irradiation was investigated. The results showed that degradation was the major reaction in the initial step of irradiation, no matter what the atmosphere was. The C-P equation seemed applicable when stabilized iPP was irradiated within a certain dose range in various atmospheres. The iPP irradiated in acetylene/air had the lowest/highest values for oxidation level, dielectric losses, D(g) and G(s)/G(x) values. The calculated D(g) values are 1.5 and 5 times larger for the irradiation in DD water and air than for the acetylene. Furthermore, our data confirm that oxidation strongly affects the gel point but has a much lower effect on the G(s)/G(x) ratio. In the case of dielectric relaxation measurements, the connection between the oxidative degradation and dielectric properties is well established and is in good agreement with IR spectroscopy measurements. The amount of carbonyl, hydroperoxide and other polar groups is much higher for the irradiation in air than in other media, leading to higher dielectric losses. Disappearance of low temperature (delta and gamma) relaxations with gamma radiation confirmed great sensitivity of iPP structure to radiation-induced changes. Complete vanishing of the gamma relaxation in iPP samples irradiated in air is connected with a large radiation-induced oxidative degradation in this medium. Similar crosslinking, oxidation and dielectric behaviour was observed for the samples irradiated in water and acetylene, indicating DD water as a good crosslinking medium.",
journal = "Hemijska industrija",
title = "Properties of Isotactic Polypropylene Irradiated in Various Atmospheres",
volume = "64",
number = "3",
pages = "201-208",
doi = "10.2298/HEMIND091221029M"
}
Miličević, D. S.,& Suljovrujić, E. H.. (2010). Properties of Isotactic Polypropylene Irradiated in Various Atmospheres. in Hemijska industrija, 64(3), 201-208.
https://doi.org/10.2298/HEMIND091221029M
Miličević DS, Suljovrujić EH. Properties of Isotactic Polypropylene Irradiated in Various Atmospheres. in Hemijska industrija. 2010;64(3):201-208.
doi:10.2298/HEMIND091221029M .
Miličević, Dejan S., Suljovrujić, Edin H., "Properties of Isotactic Polypropylene Irradiated in Various Atmospheres" in Hemijska industrija, 64, no. 3 (2010):201-208,
https://doi.org/10.2298/HEMIND091221029M . .
1
1
1

Interactions of Fast Ions with Graphene

Radović, Ivan; Hadžievski, Ljupčo; Bibić, Nataša M.; Mišković, Zoran L.

(2009)

TY  - JOUR
AU  - Radović, Ivan
AU  - Hadžievski, Ljupčo
AU  - Bibić, Nataša M.
AU  - Mišković, Zoran L.
PY  - 2009
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/6852
AB  - In this work, we study the interactions of fast ions with graphene describing the excitations of the electron gas in graphene by a two-dimensional (2D) hydrodynamic model (one-fluid and two-fluid model). The two-fluid model reproduces qualitatively the split of plasmon dispersions into the low-frequency pi-electron branch and the high-frequency sigma+pi-electron branch. We calculate the stopping force and the image force on an ion moving parallel to a single sheet of graphene. Numerical results show that the presence of the low-energy, quasiacoustic plasmon in the two-fluid model gives rise to resonant features at low velocities around its acoustic speed, which are not seen in the one-fluid model. The two models give virtually indistinguishable results for both forces at high speeds. Marked differences between the two models in the values of image forces at low speeds can be seen. Numerical results show that the magnitudes of both the stopping and image forces exhibit typical resonance-shaped velocity dependencies, with the peak positions moving to higher velocities for higher distances and with the overall magnitudes decreasing sharply with increasing distances. The second order corrections are found to be small, as expected for fast ions outside the electron gas, but their relative magnitudes should be easily discernible in experiments on ion grazing scattering from graphene. One notices effects which are similar to those obtained earlier for proton channeling in carbon nanotubes.
T2  - Hemijska industrija
T1  - Interactions of Fast Ions with Graphene
VL  - 63
IS  - 3
SP  - 151
EP  - 157
DO  - 10.2298/HEMIND0903151R
ER  - 
@article{
author = "Radović, Ivan and Hadžievski, Ljupčo and Bibić, Nataša M. and Mišković, Zoran L.",
year = "2009",
abstract = "In this work, we study the interactions of fast ions with graphene describing the excitations of the electron gas in graphene by a two-dimensional (2D) hydrodynamic model (one-fluid and two-fluid model). The two-fluid model reproduces qualitatively the split of plasmon dispersions into the low-frequency pi-electron branch and the high-frequency sigma+pi-electron branch. We calculate the stopping force and the image force on an ion moving parallel to a single sheet of graphene. Numerical results show that the presence of the low-energy, quasiacoustic plasmon in the two-fluid model gives rise to resonant features at low velocities around its acoustic speed, which are not seen in the one-fluid model. The two models give virtually indistinguishable results for both forces at high speeds. Marked differences between the two models in the values of image forces at low speeds can be seen. Numerical results show that the magnitudes of both the stopping and image forces exhibit typical resonance-shaped velocity dependencies, with the peak positions moving to higher velocities for higher distances and with the overall magnitudes decreasing sharply with increasing distances. The second order corrections are found to be small, as expected for fast ions outside the electron gas, but their relative magnitudes should be easily discernible in experiments on ion grazing scattering from graphene. One notices effects which are similar to those obtained earlier for proton channeling in carbon nanotubes.",
journal = "Hemijska industrija",
title = "Interactions of Fast Ions with Graphene",
volume = "63",
number = "3",
pages = "151-157",
doi = "10.2298/HEMIND0903151R"
}
Radović, I., Hadžievski, L., Bibić, N. M.,& Mišković, Z. L.. (2009). Interactions of Fast Ions with Graphene. in Hemijska industrija, 63(3), 151-157.
https://doi.org/10.2298/HEMIND0903151R
Radović I, Hadžievski L, Bibić NM, Mišković ZL. Interactions of Fast Ions with Graphene. in Hemijska industrija. 2009;63(3):151-157.
doi:10.2298/HEMIND0903151R .
Radović, Ivan, Hadžievski, Ljupčo, Bibić, Nataša M., Mišković, Zoran L., "Interactions of Fast Ions with Graphene" in Hemijska industrija, 63, no. 3 (2009):151-157,
https://doi.org/10.2298/HEMIND0903151R . .
1

Smart Hydrogels Based on Itaconic Acid for Biomedical Application

Tomic, Simonida Lj; Mićić, Maja M.; Krezovic, Bojana D.; Dobic, Sava N.; Suljovrujić, Edin H.; Filipović, Jovanka M.

(2009)

TY  - JOUR
AU  - Tomic, Simonida Lj
AU  - Mićić, Maja M.
AU  - Krezovic, Bojana D.
AU  - Dobic, Sava N.
AU  - Suljovrujić, Edin H.
AU  - Filipović, Jovanka M.
PY  - 2009
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/3967
AB  - pH and temperature sensitive hydrogels, based on 2-hydroxyethyl methacrylate (HEMA) and itaconic acid (IA) copolymers, were prepared by gamma irradiation and characterized in order to examine their potential use in biomedical applications. The influence of comonomer ratio in these smart copolymers on their morphology, mechanical properties, biocompatibility and microbe penetration capability was investigated. The mechanical properties of copolymers were investigated using the dynamic mechanical analysis (DMA), while their morphology was examined by scanning electron microscopy (SEM). The morphology and mechanical properties of these hydrogels were found to be suitable for most requirements of biomedical applications. The in vitro study of P(HEMA/IA) biocompatibility showed no evidence of cell toxicity nor any considerable hemolytic activity. Furthermore, the microbe penetration test showed that neither Staphylococcus aureus nor Escherichia coli passed through the hydogel dressing; thus the P(HEMA/IA) dressing could be considered a good barrier against microbes. All results indicate that stimuli-responsive P(HEMA/IA) hydrogels have great potential for biomedical applications, especially for skin treatment and wound dressings.
T2  - Hemijska industrija
T1  - Smart Hydrogels Based on Itaconic Acid for Biomedical Application
VL  - 63
IS  - 6
SP  - 603
EP  - 610
DO  - 10.2298/HEMIND0906603T
ER  - 
@article{
author = "Tomic, Simonida Lj and Mićić, Maja M. and Krezovic, Bojana D. and Dobic, Sava N. and Suljovrujić, Edin H. and Filipović, Jovanka M.",
year = "2009",
abstract = "pH and temperature sensitive hydrogels, based on 2-hydroxyethyl methacrylate (HEMA) and itaconic acid (IA) copolymers, were prepared by gamma irradiation and characterized in order to examine their potential use in biomedical applications. The influence of comonomer ratio in these smart copolymers on their morphology, mechanical properties, biocompatibility and microbe penetration capability was investigated. The mechanical properties of copolymers were investigated using the dynamic mechanical analysis (DMA), while their morphology was examined by scanning electron microscopy (SEM). The morphology and mechanical properties of these hydrogels were found to be suitable for most requirements of biomedical applications. The in vitro study of P(HEMA/IA) biocompatibility showed no evidence of cell toxicity nor any considerable hemolytic activity. Furthermore, the microbe penetration test showed that neither Staphylococcus aureus nor Escherichia coli passed through the hydogel dressing; thus the P(HEMA/IA) dressing could be considered a good barrier against microbes. All results indicate that stimuli-responsive P(HEMA/IA) hydrogels have great potential for biomedical applications, especially for skin treatment and wound dressings.",
journal = "Hemijska industrija",
title = "Smart Hydrogels Based on Itaconic Acid for Biomedical Application",
volume = "63",
number = "6",
pages = "603-610",
doi = "10.2298/HEMIND0906603T"
}
Tomic, S. L., Mićić, M. M., Krezovic, B. D., Dobic, S. N., Suljovrujić, E. H.,& Filipović, J. M.. (2009). Smart Hydrogels Based on Itaconic Acid for Biomedical Application. in Hemijska industrija, 63(6), 603-610.
https://doi.org/10.2298/HEMIND0906603T
Tomic SL, Mićić MM, Krezovic BD, Dobic SN, Suljovrujić EH, Filipović JM. Smart Hydrogels Based on Itaconic Acid for Biomedical Application. in Hemijska industrija. 2009;63(6):603-610.
doi:10.2298/HEMIND0906603T .
Tomic, Simonida Lj, Mićić, Maja M., Krezovic, Bojana D., Dobic, Sava N., Suljovrujić, Edin H., Filipović, Jovanka M., "Smart Hydrogels Based on Itaconic Acid for Biomedical Application" in Hemijska industrija, 63, no. 6 (2009):603-610,
https://doi.org/10.2298/HEMIND0906603T . .
1
1