TY  - JOUR
AU  - Modrić-Šahbazović, Almedina
AU  - Novaković, Mirjana M.
AU  - Schmidt, Emanuel O.
AU  - Gazdić, Izet
AU  - Đokić, Veljko
AU  - Peruško, Davor
AU  - Bibić, Nataša M.
AU  - Ronning, Carsten
AU  - Rakočević, Zlatko Lj.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4160
AB  - Nanosphere lithography is an effective technique for high throughput fabrication of well-ordered patterns on large areas. This study reports on nanostructuring of silicon samples by means of Ag ions implantation through self-organized polystyrene (PS) masks. The PS nanospheres with a diameter of similar to 150 nm were self-assembled in a hexagonal array on top of Si(100) wafers, and then used as a mask for subsequent 60 keV silver ion implantation. Different fluences were applied up to 2 x 10(16) ions/cm(2) in order to create a distribution of different sizes and densities of buried metal nanoparticles. The surface morphology and the subsurface structures were studied by scanning electron microscopy and cross-sectional transmission electron microscopy, as a function of the mask deformation upon irradiation and the implantation parameters itself. We demonstrate that Ag is implanted into Si only through the mask openings, thus forming a regular array of amorphized regions over the wide area of silicon substrate. These fragments are of similar dimensions of the spheres with widths of about 190 nm and distributed over 60 nm in depth due to the given ion range. At the subsurface region of the implanted fragments, the synthesis of small sized and optically active Ag nanoparticles is clearly observed. The samples show a strong absorption peak in the long-wavelength region from 689 to 745 nm characteristic for surface plasmon resonance excitations, which could be fitted well using the Maxwell-Garnett's theory.
PB  - Elsevier Science Bv, Amsterdam
T2  - Optical Materials
T1  - Silicon nanostructuring by Ag ions implantation through nanosphere lithography mask
EP  - 515
SP  - 508
VL  - 88
DO  - 10.1016/j.optmat.2018.12.022
ER  - 

@article{
author = "Modrić-Šahbazović, Almedina and Novaković, Mirjana M. and Schmidt, Emanuel O. and Gazdić, Izet and Đokić, Veljko and Peruško, Davor and Bibić, Nataša M. and Ronning, Carsten and Rakočević, Zlatko Lj.",
year = "2019",
abstract = "Nanosphere lithography is an effective technique for high throughput fabrication of well-ordered patterns on large areas. This study reports on nanostructuring of silicon samples by means of Ag ions implantation through self-organized polystyrene (PS) masks. The PS nanospheres with a diameter of similar to 150 nm were self-assembled in a hexagonal array on top of Si(100) wafers, and then used as a mask for subsequent 60 keV silver ion implantation. Different fluences were applied up to 2 x 10(16) ions/cm(2) in order to create a distribution of different sizes and densities of buried metal nanoparticles. The surface morphology and the subsurface structures were studied by scanning electron microscopy and cross-sectional transmission electron microscopy, as a function of the mask deformation upon irradiation and the implantation parameters itself. We demonstrate that Ag is implanted into Si only through the mask openings, thus forming a regular array of amorphized regions over the wide area of silicon substrate. These fragments are of similar dimensions of the spheres with widths of about 190 nm and distributed over 60 nm in depth due to the given ion range. At the subsurface region of the implanted fragments, the synthesis of small sized and optically active Ag nanoparticles is clearly observed. The samples show a strong absorption peak in the long-wavelength region from 689 to 745 nm characteristic for surface plasmon resonance excitations, which could be fitted well using the Maxwell-Garnett's theory.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Optical Materials",
title = "Silicon nanostructuring by Ag ions implantation through nanosphere lithography mask",
pages = "515-508",
volume = "88",
doi = "10.1016/j.optmat.2018.12.022"
}

Modrić-Šahbazović, A., Novaković, M. M., Schmidt, E. O., Gazdić, I., Đokić, V., Peruško, D., Bibić, N. M., Ronning, C.,& Rakočević, Z. Lj.. (2019). Silicon nanostructuring by Ag ions implantation through nanosphere lithography mask. in Optical Materials
Elsevier Science Bv, Amsterdam., 88, 508-515.
https://doi.org/10.1016/j.optmat.2018.12.022

Modrić-Šahbazović A, Novaković MM, Schmidt EO, Gazdić I, Đokić V, Peruško D, Bibić NM, Ronning C, Rakočević ZL. Silicon nanostructuring by Ag ions implantation through nanosphere lithography mask. in Optical Materials. 2019;88:508-515.
doi:10.1016/j.optmat.2018.12.022 .

Modrić-Šahbazović, Almedina, Novaković, Mirjana M., Schmidt, Emanuel O., Gazdić, Izet, Đokić, Veljko, Peruško, Davor, Bibić, Nataša M., Ronning, Carsten, Rakočević, Zlatko Lj., "Silicon nanostructuring by Ag ions implantation through nanosphere lithography mask" in Optical Materials, 88 (2019):508-515,
https://doi.org/10.1016/j.optmat.2018.12.022 . .

TY  - JOUR
AU  - Modrić-Šahbazović, Almedina
AU  - Novaković, Mirjana M.
AU  - Đokić, Veljko
AU  - Gazdić, Izet
AU  - Bibić, Nataša M.
AU  - Rakočević, Zlatko Lj.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3920
AB  - The self-assembly methods, an inexpensive and high throughput technique capable of producing nanostructure arrays, relies on the formation on a monolayer of self-assembled nanospheres. This paper reports on the formation of large-areas monolayer polystyrene particles similar to 150 nm in diameter onto monocrystalline Si (100) substrates by using the spin-coating method. In this method, the quality of the deposited monolayer is determined by the balance between spinning and solvent evaporation, accounted by two different forces, the centrifugal force and viscous shearing force, and their interplay. The key process parameters which influence the deposition process and determine the properties of polystyrene monolayers such as the spinning rate, time and concentration of PS particles in the solution were studied. By varying the experimental conditions in different steps the films quality can be easily improved and the optimized experimental parameters were achieved. A homogenous and well-ordered PS monolayer with a high surface coverage of similar to 94 % was formed on a large-area substrate of 1 cm x1 cm at specific conditions of a 2000 rpm spinning rate, 2 wt. % polystyrene solution concentration and 210 s duration of the spinning process. We conclude that this method can be useful in a variety of applications since it offers a stable and controllable approach to the fabrication of monolayer polystyrene films on a large-scale.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology & Radiation Protection
T1  - Formation of a large-area monolayer of polystyrene film via the spin-coating method
EP  - 251
IS  - 3
SP  - 246
VL  - 33
DO  - 10.2298/NTRP1803246M
ER  - 

@article{
author = "Modrić-Šahbazović, Almedina and Novaković, Mirjana M. and Đokić, Veljko and Gazdić, Izet and Bibić, Nataša M. and Rakočević, Zlatko Lj.",
year = "2018",
abstract = "The self-assembly methods, an inexpensive and high throughput technique capable of producing nanostructure arrays, relies on the formation on a monolayer of self-assembled nanospheres. This paper reports on the formation of large-areas monolayer polystyrene particles similar to 150 nm in diameter onto monocrystalline Si (100) substrates by using the spin-coating method. In this method, the quality of the deposited monolayer is determined by the balance between spinning and solvent evaporation, accounted by two different forces, the centrifugal force and viscous shearing force, and their interplay. The key process parameters which influence the deposition process and determine the properties of polystyrene monolayers such as the spinning rate, time and concentration of PS particles in the solution were studied. By varying the experimental conditions in different steps the films quality can be easily improved and the optimized experimental parameters were achieved. A homogenous and well-ordered PS monolayer with a high surface coverage of similar to 94 % was formed on a large-area substrate of 1 cm x1 cm at specific conditions of a 2000 rpm spinning rate, 2 wt. % polystyrene solution concentration and 210 s duration of the spinning process. We conclude that this method can be useful in a variety of applications since it offers a stable and controllable approach to the fabrication of monolayer polystyrene films on a large-scale.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology & Radiation Protection",
title = "Formation of a large-area monolayer of polystyrene film via the spin-coating method",
pages = "251-246",
number = "3",
volume = "33",
doi = "10.2298/NTRP1803246M"
}

Modrić-Šahbazović, A., Novaković, M. M., Đokić, V., Gazdić, I., Bibić, N. M.,& Rakočević, Z. Lj.. (2018). Formation of a large-area monolayer of polystyrene film via the spin-coating method. in Nuclear Technology & Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 33(3), 246-251.
https://doi.org/10.2298/NTRP1803246M

Modrić-Šahbazović A, Novaković MM, Đokić V, Gazdić I, Bibić NM, Rakočević ZL. Formation of a large-area monolayer of polystyrene film via the spin-coating method. in Nuclear Technology & Radiation Protection. 2018;33(3):246-251.
doi:10.2298/NTRP1803246M .

Modrić-Šahbazović, Almedina, Novaković, Mirjana M., Đokić, Veljko, Gazdić, Izet, Bibić, Nataša M., Rakočević, Zlatko Lj., "Formation of a large-area monolayer of polystyrene film via the spin-coating method" in Nuclear Technology & Radiation Protection, 33, no. 3 (2018):246-251,
https://doi.org/10.2298/NTRP1803246M . .

TY  - JOUR
AU  - Surudžić, Rade
AU  - Janković, Ana
AU  - Bibić, Nataša M.
AU  - Vukašinović-Sekulić, Maja
AU  - Perić-Grujić, Aleksandra
AU  - Mišković-Stanković, Vesna
AU  - Park, Soo Jin
AU  - Rhee, Kyong Yop
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3371
AB  - Silver/poly(vinyl alcohol) and silver/poly(vinyl alcohol)/graphene nanocomposites in different forms (colloid dispersion, thin films and hydrogel discs) were synthesized by electrochemical reduction of Ag+ ions at constant current density. CV, Raman, XRD, FT-IR, and XPS analyses were used to characterize the interactions between silver nanoparticles, PVA molecules, and graphene. Ag/PVA/Gr nanocomposites had better mechanical and thermal properties and higher antibacterial activity against Staphylococcus aureus and Escherichia coli than Ag/PVA nanocomposites. Slow silver release, as well as a high remaining silver content (76%) after 28 days in simulated body fluid confirmed that both Ag/PVA and Ag/PVA/Gr nanocomposites are capable of maintaining sterility over time.
PB  - Elsevier Sci Ltd, Oxford
T2  - Composites Part B-Engineering
T1  - Physico-chemical and mechanical properties and antibacterial activity of silver/poly(vinyl alcohol)/graphene nanocomposites obtained by electrochemical method
EP  - 112
SP  - 102
VL  - 85
DO  - 10.1016/j.compositesb.2015.09.029
ER  - 

@article{
author = "Surudžić, Rade and Janković, Ana and Bibić, Nataša M. and Vukašinović-Sekulić, Maja and Perić-Grujić, Aleksandra and Mišković-Stanković, Vesna and Park, Soo Jin and Rhee, Kyong Yop",
year = "2016",
abstract = "Silver/poly(vinyl alcohol) and silver/poly(vinyl alcohol)/graphene nanocomposites in different forms (colloid dispersion, thin films and hydrogel discs) were synthesized by electrochemical reduction of Ag+ ions at constant current density. CV, Raman, XRD, FT-IR, and XPS analyses were used to characterize the interactions between silver nanoparticles, PVA molecules, and graphene. Ag/PVA/Gr nanocomposites had better mechanical and thermal properties and higher antibacterial activity against Staphylococcus aureus and Escherichia coli than Ag/PVA nanocomposites. Slow silver release, as well as a high remaining silver content (76%) after 28 days in simulated body fluid confirmed that both Ag/PVA and Ag/PVA/Gr nanocomposites are capable of maintaining sterility over time.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Composites Part B-Engineering",
title = "Physico-chemical and mechanical properties and antibacterial activity of silver/poly(vinyl alcohol)/graphene nanocomposites obtained by electrochemical method",
pages = "112-102",
volume = "85",
doi = "10.1016/j.compositesb.2015.09.029"
}

Surudžić, R., Janković, A., Bibić, N. M., Vukašinović-Sekulić, M., Perić-Grujić, A., Mišković-Stanković, V., Park, S. J.,& Rhee, K. Y.. (2016). Physico-chemical and mechanical properties and antibacterial activity of silver/poly(vinyl alcohol)/graphene nanocomposites obtained by electrochemical method. in Composites Part B-Engineering
Elsevier Sci Ltd, Oxford., 85, 102-112.
https://doi.org/10.1016/j.compositesb.2015.09.029

Surudžić R, Janković A, Bibić NM, Vukašinović-Sekulić M, Perić-Grujić A, Mišković-Stanković V, Park SJ, Rhee KY. Physico-chemical and mechanical properties and antibacterial activity of silver/poly(vinyl alcohol)/graphene nanocomposites obtained by electrochemical method. in Composites Part B-Engineering. 2016;85:102-112.
doi:10.1016/j.compositesb.2015.09.029 .

Surudžić, Rade, Janković, Ana, Bibić, Nataša M., Vukašinović-Sekulić, Maja, Perić-Grujić, Aleksandra, Mišković-Stanković, Vesna, Park, Soo Jin, Rhee, Kyong Yop, "Physico-chemical and mechanical properties and antibacterial activity of silver/poly(vinyl alcohol)/graphene nanocomposites obtained by electrochemical method" in Composites Part B-Engineering, 85 (2016):102-112,
https://doi.org/10.1016/j.compositesb.2015.09.029 . .

TY  - JOUR
AU  - Surudžić, Rade
AU  - Jovanović, Željka
AU  - Bibić, Nataša M.
AU  - Nikolić, Branislav Ž.
AU  - Mišković-Stanković, Vesna
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2365
AB  - In this work, silver/poly(vinyl alcohol), Ag/PVA, colloidal dispersions were obtained by electrochemical reduction of Ag+. The electrochemical synthesis of silver nanoparticles in aqueous solutions of 5 and 10 wt. % PVA, containing 0.1 M KNO3 and 3.9 mM AgNO3, was performed at a constant current density of 25 mA cm-2 for a synthesis time of 10 min. The presence of silver nanoparticles was confirmed by UV-Vis spectroscopy. Cyclic voltammetry analysis and FT-IR spectroscopy indicated interactions between the silver nanoparticles and the PVA molecules. TEM analysis confirmed the spherical shape of the obtained silver nanoparticles, with a mean diameter of 15±9 nm. .
AB  - U ovom radu pokazano je dobijanje koloidnih disperzija srebro/poli(vinil alkohol), Ag/PVA, elektrohemijskom redukcijom Ag+. Elektrohemijska sinteza nanočestica srebra u vodenim rastvorima poli(vinil alkohola) sa 5 i 10 mas. % PVA, koji su sadržali 0,1 M KNO3 i 3,9 mM AgNO3, vršena je pri konstantnoj gustini struje od 25 mA×cm-2 u trajanju od 10 min. Prisustvo nanočestica srebra potvrđeno je ultraljubičastom i vidljivom spektroskopijom. Cikličnom voltametrijom i infracrvenom spektroskopijom pokazana je interakcija između nanočestica srebra i molekula poli(vinil alkohola). Analizom transmisione elektronske mikroskopije je potvrđeno da su dobijene nanočestice srebra sfernog oblika, prečnika 15±9 nm. .
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical synthesis of silver nanoparticles in poly(vinyl alcohol) solution
T1  - Elektrohemijska sinteza nanočestica srebra u rastvoru poli(vinil alkohola)
EP  - 2098
IS  - 12
SP  - 2087
VL  - 78
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2365
ER  - 

@article{
author = "Surudžić, Rade and Jovanović, Željka and Bibić, Nataša M. and Nikolić, Branislav Ž. and Mišković-Stanković, Vesna",
year = "2013",
abstract = "In this work, silver/poly(vinyl alcohol), Ag/PVA, colloidal dispersions were obtained by electrochemical reduction of Ag+. The electrochemical synthesis of silver nanoparticles in aqueous solutions of 5 and 10 wt. % PVA, containing 0.1 M KNO3 and 3.9 mM AgNO3, was performed at a constant current density of 25 mA cm-2 for a synthesis time of 10 min. The presence of silver nanoparticles was confirmed by UV-Vis spectroscopy. Cyclic voltammetry analysis and FT-IR spectroscopy indicated interactions between the silver nanoparticles and the PVA molecules. TEM analysis confirmed the spherical shape of the obtained silver nanoparticles, with a mean diameter of 15±9 nm. ., U ovom radu pokazano je dobijanje koloidnih disperzija srebro/poli(vinil alkohol), Ag/PVA, elektrohemijskom redukcijom Ag+. Elektrohemijska sinteza nanočestica srebra u vodenim rastvorima poli(vinil alkohola) sa 5 i 10 mas. % PVA, koji su sadržali 0,1 M KNO3 i 3,9 mM AgNO3, vršena je pri konstantnoj gustini struje od 25 mA×cm-2 u trajanju od 10 min. Prisustvo nanočestica srebra potvrđeno je ultraljubičastom i vidljivom spektroskopijom. Cikličnom voltametrijom i infracrvenom spektroskopijom pokazana je interakcija između nanočestica srebra i molekula poli(vinil alkohola). Analizom transmisione elektronske mikroskopije je potvrđeno da su dobijene nanočestice srebra sfernog oblika, prečnika 15±9 nm. .",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical synthesis of silver nanoparticles in poly(vinyl alcohol) solution, Elektrohemijska sinteza nanočestica srebra u rastvoru poli(vinil alkohola)",
pages = "2098-2087",
number = "12",
volume = "78",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2365"
}

Surudžić, R., Jovanović, Ž., Bibić, N. M., Nikolić, B. Ž.,& Mišković-Stanković, V.. (2013). Electrochemical synthesis of silver nanoparticles in poly(vinyl alcohol) solution. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 78(12), 2087-2098.
https://hdl.handle.net/21.15107/rcub_technorep_2365

Surudžić R, Jovanović Ž, Bibić NM, Nikolić BŽ, Mišković-Stanković V. Electrochemical synthesis of silver nanoparticles in poly(vinyl alcohol) solution. in Journal of the Serbian Chemical Society. 2013;78(12):2087-2098.
https://hdl.handle.net/21.15107/rcub_technorep_2365 .

Surudžić, Rade, Jovanović, Željka, Bibić, Nataša M., Nikolić, Branislav Ž., Mišković-Stanković, Vesna, "Electrochemical synthesis of silver nanoparticles in poly(vinyl alcohol) solution" in Journal of the Serbian Chemical Society, 78, no. 12 (2013):2087-2098,
https://hdl.handle.net/21.15107/rcub_technorep_2365 .

TY  - JOUR
AU  - Trandafilović, Lidija V.
AU  - Luyt, Adriaan S.
AU  - Bibić, Nataša M.
AU  - Dimitrijević-Branković, Suzana
AU  - Georges, Michael K.
AU  - Radhakrishnan, Thottackad
AU  - Đoković, Vladimir
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2177
AB  - Poly(2-(dimethylamino)ethyl methacrylate-co-acrylic acid) polyampholyte copolymers were synthesized by radical polymerization of the co-monomers in different molar ratios (2-1, 1-1 and 1-2). The water solutions of the obtained materials were used as stabilization agents for the synthesis of silver nanoparticles. XRD. FTIR and DMA methods were used to study the physical properties of the pure copolymers. It was found that the copolymer is a completely amorphous and inhomogeneous material. The FTIR spectrum was analysed by using literature data and corresponding numerical simulations. TEM analysis showed that the shape of the nanoparticles prepared by reduction of the silver salt in the presence of co-polymers strongly depends on the ratio of DMAEMA and AA co-monomer units. Besides spherical Ag-nanoparticles, reduction in the presence of the polymer with equal molar content of co-monomers also resulted in the formation of nano-plate particles (circular thin plates and thin triangular nanoprisms). The formation of the nano-plate particles was further promoted by heating the mentioned solution at 60 degrees C in air. UV-vis spectroscopy was used to study the change in the surface plasmon resonance behaviour during the growth of the nanoplates. The Ag-nanocomposite thin films of all three co-polymers showed fast antimicrobial activity against the Staphylococcus aureus, Escherichia coli and Candida albicans pathogens (more than 99% reduction after 2 h of exposure).
PB  - Elsevier Science Bv, Amsterdam
T2  - Colloids and Surfaces A-Physicochemical and Engineering Aspects
T1  - Formation of nano-plate silver particles in the presence of polyampholyte copolymer
EP  - 25
SP  - 17
VL  - 414
DO  - 10.1016/j.colsurfa.2012.08.010
ER  - 

@article{
author = "Trandafilović, Lidija V. and Luyt, Adriaan S. and Bibić, Nataša M. and Dimitrijević-Branković, Suzana and Georges, Michael K. and Radhakrishnan, Thottackad and Đoković, Vladimir",
year = "2012",
abstract = "Poly(2-(dimethylamino)ethyl methacrylate-co-acrylic acid) polyampholyte copolymers were synthesized by radical polymerization of the co-monomers in different molar ratios (2-1, 1-1 and 1-2). The water solutions of the obtained materials were used as stabilization agents for the synthesis of silver nanoparticles. XRD. FTIR and DMA methods were used to study the physical properties of the pure copolymers. It was found that the copolymer is a completely amorphous and inhomogeneous material. The FTIR spectrum was analysed by using literature data and corresponding numerical simulations. TEM analysis showed that the shape of the nanoparticles prepared by reduction of the silver salt in the presence of co-polymers strongly depends on the ratio of DMAEMA and AA co-monomer units. Besides spherical Ag-nanoparticles, reduction in the presence of the polymer with equal molar content of co-monomers also resulted in the formation of nano-plate particles (circular thin plates and thin triangular nanoprisms). The formation of the nano-plate particles was further promoted by heating the mentioned solution at 60 degrees C in air. UV-vis spectroscopy was used to study the change in the surface plasmon resonance behaviour during the growth of the nanoplates. The Ag-nanocomposite thin films of all three co-polymers showed fast antimicrobial activity against the Staphylococcus aureus, Escherichia coli and Candida albicans pathogens (more than 99% reduction after 2 h of exposure).",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Colloids and Surfaces A-Physicochemical and Engineering Aspects",
title = "Formation of nano-plate silver particles in the presence of polyampholyte copolymer",
pages = "25-17",
volume = "414",
doi = "10.1016/j.colsurfa.2012.08.010"
}

Trandafilović, L. V., Luyt, A. S., Bibić, N. M., Dimitrijević-Branković, S., Georges, M. K., Radhakrishnan, T.,& Đoković, V.. (2012). Formation of nano-plate silver particles in the presence of polyampholyte copolymer. in Colloids and Surfaces A-Physicochemical and Engineering Aspects
Elsevier Science Bv, Amsterdam., 414, 17-25.
https://doi.org/10.1016/j.colsurfa.2012.08.010

Trandafilović LV, Luyt AS, Bibić NM, Dimitrijević-Branković S, Georges MK, Radhakrishnan T, Đoković V. Formation of nano-plate silver particles in the presence of polyampholyte copolymer. in Colloids and Surfaces A-Physicochemical and Engineering Aspects. 2012;414:17-25.
doi:10.1016/j.colsurfa.2012.08.010 .

Trandafilović, Lidija V., Luyt, Adriaan S., Bibić, Nataša M., Dimitrijević-Branković, Suzana, Georges, Michael K., Radhakrishnan, Thottackad, Đoković, Vladimir, "Formation of nano-plate silver particles in the presence of polyampholyte copolymer" in Colloids and Surfaces A-Physicochemical and Engineering Aspects, 414 (2012):17-25,
https://doi.org/10.1016/j.colsurfa.2012.08.010 . .

TY  - JOUR
AU  - Jovanović, Željka
AU  - Radosavljević, Aleksandra
AU  - Šiljegović, Milorad
AU  - Bibić, Nataša M.
AU  - Mišković-Stanković, Vesna
AU  - Kačarević-Popović, Zorica M.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2113
AB  - Silver nanoparticles (AgNPs) were synthesized in situ by gamma-irradiation using poly(N-vinyl-2-pyrrolidone) (PVP) as a capping agent. The concentration, molecular weight and the structure (crosslinked and interpenetrated network) of PVP were varied, in order to determine the influence of the capping agent in the radiolytic synthesis of the Ag/PVP nanosystems. Transmission electron microscopy (TEM) showed that AgNPs obtained from the solutions containing higher PVP concentration and higher molecular weight were spherical in shape, with narrow size distribution and a diameter of similar to 6 nm, while slightly larger rod-shaped silver agglomerates, with bimodal nanoparticle size distribution and diameters of similar to 10 nm and similar to 20 nm were obtained from the solutions containing lower PVP concentration and lower molecular weight. Strong plasmon coupling and extending of plasmon resonance was observed by UV-vis spectroscopy, as a result of formation of nanorod-like agglomerates. Crosslinked and interpenetrated network did not affect the structure of synthesized AgNPs. Ag/PVP nanocomposite, in the form of thin film, was obtained by solvent evaporation from Ag/PVP colloid solution with 10 wt% of PVP, and characterized by FTIR spectroscopy. The interactions in Ag/PVP nanocomposite are shown to be the result of the coordination bonding between AgNPs and nitrogen from pyrrolidone ring of PVP. The optical properties of investigated Ag/PVP nanosystems, as measured by the values of optical band gap, E-g, are mainly the consequence of the interparticle distance as a result of the concentration and the structure of surrounding PVP macromolecules.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Radiation Physics and Chemistry
T1  - Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation
EP  - 1728
IS  - 11
SP  - 1720
VL  - 81
DO  - 10.1016/j.radphyschem.2012.05.019
ER  - 

@article{
author = "Jovanović, Željka and Radosavljević, Aleksandra and Šiljegović, Milorad and Bibić, Nataša M. and Mišković-Stanković, Vesna and Kačarević-Popović, Zorica M.",
year = "2012",
abstract = "Silver nanoparticles (AgNPs) were synthesized in situ by gamma-irradiation using poly(N-vinyl-2-pyrrolidone) (PVP) as a capping agent. The concentration, molecular weight and the structure (crosslinked and interpenetrated network) of PVP were varied, in order to determine the influence of the capping agent in the radiolytic synthesis of the Ag/PVP nanosystems. Transmission electron microscopy (TEM) showed that AgNPs obtained from the solutions containing higher PVP concentration and higher molecular weight were spherical in shape, with narrow size distribution and a diameter of similar to 6 nm, while slightly larger rod-shaped silver agglomerates, with bimodal nanoparticle size distribution and diameters of similar to 10 nm and similar to 20 nm were obtained from the solutions containing lower PVP concentration and lower molecular weight. Strong plasmon coupling and extending of plasmon resonance was observed by UV-vis spectroscopy, as a result of formation of nanorod-like agglomerates. Crosslinked and interpenetrated network did not affect the structure of synthesized AgNPs. Ag/PVP nanocomposite, in the form of thin film, was obtained by solvent evaporation from Ag/PVP colloid solution with 10 wt% of PVP, and characterized by FTIR spectroscopy. The interactions in Ag/PVP nanocomposite are shown to be the result of the coordination bonding between AgNPs and nitrogen from pyrrolidone ring of PVP. The optical properties of investigated Ag/PVP nanosystems, as measured by the values of optical band gap, E-g, are mainly the consequence of the interparticle distance as a result of the concentration and the structure of surrounding PVP macromolecules.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Radiation Physics and Chemistry",
title = "Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation",
pages = "1728-1720",
number = "11",
volume = "81",
doi = "10.1016/j.radphyschem.2012.05.019"
}

Jovanović, Ž., Radosavljević, A., Šiljegović, M., Bibić, N. M., Mišković-Stanković, V.,& Kačarević-Popović, Z. M.. (2012). Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation. in Radiation Physics and Chemistry
Pergamon-Elsevier Science Ltd, Oxford., 81(11), 1720-1728.
https://doi.org/10.1016/j.radphyschem.2012.05.019

Jovanović Ž, Radosavljević A, Šiljegović M, Bibić NM, Mišković-Stanković V, Kačarević-Popović ZM. Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation. in Radiation Physics and Chemistry. 2012;81(11):1720-1728.
doi:10.1016/j.radphyschem.2012.05.019 .

Jovanović, Željka, Radosavljević, Aleksandra, Šiljegović, Milorad, Bibić, Nataša M., Mišković-Stanković, Vesna, Kačarević-Popović, Zorica M., "Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation" in Radiation Physics and Chemistry, 81, no. 11 (2012):1720-1728,
https://doi.org/10.1016/j.radphyschem.2012.05.019 . .

TY  - JOUR
AU  - Božanić, Dušan K.
AU  - Dimitrijević-Branković, Suzana
AU  - Bibić, Nataša M.
AU  - Luyt, Adriaan S.
AU  - Đoković, Vladimir
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1927
AB  - The glycogen biopolymer from the bovine liver has been used as stabilization agent for the growth of silver nanoparticles The samples with various contents of silver were prepared by two different procedures that include fast (using microwave radiation) and slow (conventional) heating of the reaction mixtures The TEM images of the two nanocomposites showed the presence of nanoparticles with average diameter of 9 7 and 10 4 nm respectively The results also revealed that the optical properties of the obtained nanocomposite samples strongly depend on the method of preparation The samples prepared using microwave radiation exhibited narrower surface plasmon resonance peaks while the silver nanoparticles induced quenching of the photoluminescence of glycogen in all of the tested samples Antimicrobial activity tests were carried out against Staphylococcus aureus Escherichia coli and Candida albicans pathogens and showed that the microbial growth was gradually reduced as the concentration of the silver increased Also after 2 h of exposure to the nanocomposites the number of cells was significantly reduced ( gt 99%) for all the strains tested
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Silver nanoparticles encapsulated in glycogen biopolymer Morphology, optical and antimicrobial properties
EP  - 890
IS  - 2
SP  - 883
VL  - 83
DO  - 10.1016/j.carbpol.2010.08.070
ER  - 

@article{
author = "Božanić, Dušan K. and Dimitrijević-Branković, Suzana and Bibić, Nataša M. and Luyt, Adriaan S. and Đoković, Vladimir",
year = "2011",
abstract = "The glycogen biopolymer from the bovine liver has been used as stabilization agent for the growth of silver nanoparticles The samples with various contents of silver were prepared by two different procedures that include fast (using microwave radiation) and slow (conventional) heating of the reaction mixtures The TEM images of the two nanocomposites showed the presence of nanoparticles with average diameter of 9 7 and 10 4 nm respectively The results also revealed that the optical properties of the obtained nanocomposite samples strongly depend on the method of preparation The samples prepared using microwave radiation exhibited narrower surface plasmon resonance peaks while the silver nanoparticles induced quenching of the photoluminescence of glycogen in all of the tested samples Antimicrobial activity tests were carried out against Staphylococcus aureus Escherichia coli and Candida albicans pathogens and showed that the microbial growth was gradually reduced as the concentration of the silver increased Also after 2 h of exposure to the nanocomposites the number of cells was significantly reduced ( gt 99%) for all the strains tested",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Silver nanoparticles encapsulated in glycogen biopolymer Morphology, optical and antimicrobial properties",
pages = "890-883",
number = "2",
volume = "83",
doi = "10.1016/j.carbpol.2010.08.070"
}

Božanić, D. K., Dimitrijević-Branković, S., Bibić, N. M., Luyt, A. S.,& Đoković, V.. (2011). Silver nanoparticles encapsulated in glycogen biopolymer Morphology, optical and antimicrobial properties. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 83(2), 883-890.
https://doi.org/10.1016/j.carbpol.2010.08.070

Božanić DK, Dimitrijević-Branković S, Bibić NM, Luyt AS, Đoković V. Silver nanoparticles encapsulated in glycogen biopolymer Morphology, optical and antimicrobial properties. in Carbohydrate Polymers. 2011;83(2):883-890.
doi:10.1016/j.carbpol.2010.08.070 .

Božanić, Dušan K., Dimitrijević-Branković, Suzana, Bibić, Nataša M., Luyt, Adriaan S., Đoković, Vladimir, "Silver nanoparticles encapsulated in glycogen biopolymer Morphology, optical and antimicrobial properties" in Carbohydrate Polymers, 83, no. 2 (2011):883-890,
https://doi.org/10.1016/j.carbpol.2010.08.070 . .

TY  - JOUR
AU  - Đošić, Marija
AU  - Mišković-Stanković, Vesna
AU  - Kačarević-Popović, Zorica M.
AU  - Jokić, Bojan
AU  - Bibić, Nataša M.
AU  - Mitrić, Miodrag
AU  - Milonjić, Slobodan K.
AU  - Jančić-Heinemann, Radmila
AU  - Stojanović, Jovica
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1514
AB  - Electrochemical synthesis of nanosized monetite powder was performed galvanostatically from homogeneous Solution of Na(2)H(2)EDTA center dot 2H(2)O, NaH2PO4 and CaCl2 at a concentration relationship Ca/EDTA/PO43- of 0.25/0.25/0.15 M at current density of 137 mA cm(-2) and pH value of 5.0. The synthesized monetite powder was characterized by X-ray diffraction, infrared spectroscopy, size distribution measurements, thermogravimetric and differential thermal analysis and scanning electron microscopy. Monetite powder was electrophoretically deposited on titanium from ethanol Suspension, using constant voltage method. The deposition was performed at constant voltage between 10 and 50 V and for a constant deposition time between 1 and 30 min. The influence of the applied voltage and deposition time on the mass and morphology of monetite deposits was investigated. It was shown that monetite deposits of the highest thickness and the lowest porosity can be formed at lower applied voltage (30 V) and for longer deposition time (20 min) and then converted to hydroxyapatite.
PB  - Elsevier Science Bv, Amsterdam
T2  - Colloids and Surfaces A-Physicochemical and Engineering Aspects
T1  - Electrochemical synthesis of nanosized monetite powder and its electrophoretic deposition on titanium
EP  - 117
IS  - 1-3
SP  - 110
VL  - 341
DO  - 10.1016/j.colsurfa.2009.03.046
ER  - 

@article{
author = "Đošić, Marija and Mišković-Stanković, Vesna and Kačarević-Popović, Zorica M. and Jokić, Bojan and Bibić, Nataša M. and Mitrić, Miodrag and Milonjić, Slobodan K. and Jančić-Heinemann, Radmila and Stojanović, Jovica",
year = "2009",
abstract = "Electrochemical synthesis of nanosized monetite powder was performed galvanostatically from homogeneous Solution of Na(2)H(2)EDTA center dot 2H(2)O, NaH2PO4 and CaCl2 at a concentration relationship Ca/EDTA/PO43- of 0.25/0.25/0.15 M at current density of 137 mA cm(-2) and pH value of 5.0. The synthesized monetite powder was characterized by X-ray diffraction, infrared spectroscopy, size distribution measurements, thermogravimetric and differential thermal analysis and scanning electron microscopy. Monetite powder was electrophoretically deposited on titanium from ethanol Suspension, using constant voltage method. The deposition was performed at constant voltage between 10 and 50 V and for a constant deposition time between 1 and 30 min. The influence of the applied voltage and deposition time on the mass and morphology of monetite deposits was investigated. It was shown that monetite deposits of the highest thickness and the lowest porosity can be formed at lower applied voltage (30 V) and for longer deposition time (20 min) and then converted to hydroxyapatite.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Colloids and Surfaces A-Physicochemical and Engineering Aspects",
title = "Electrochemical synthesis of nanosized monetite powder and its electrophoretic deposition on titanium",
pages = "117-110",
number = "1-3",
volume = "341",
doi = "10.1016/j.colsurfa.2009.03.046"
}

Đošić, M., Mišković-Stanković, V., Kačarević-Popović, Z. M., Jokić, B., Bibić, N. M., Mitrić, M., Milonjić, S. K., Jančić-Heinemann, R.,& Stojanović, J.. (2009). Electrochemical synthesis of nanosized monetite powder and its electrophoretic deposition on titanium. in Colloids and Surfaces A-Physicochemical and Engineering Aspects
Elsevier Science Bv, Amsterdam., 341(1-3), 110-117.
https://doi.org/10.1016/j.colsurfa.2009.03.046

Đošić M, Mišković-Stanković V, Kačarević-Popović ZM, Jokić B, Bibić NM, Mitrić M, Milonjić SK, Jančić-Heinemann R, Stojanović J. Electrochemical synthesis of nanosized monetite powder and its electrophoretic deposition on titanium. in Colloids and Surfaces A-Physicochemical and Engineering Aspects. 2009;341(1-3):110-117.
doi:10.1016/j.colsurfa.2009.03.046 .

Đošić, Marija, Mišković-Stanković, Vesna, Kačarević-Popović, Zorica M., Jokić, Bojan, Bibić, Nataša M., Mitrić, Miodrag, Milonjić, Slobodan K., Jančić-Heinemann, Radmila, Stojanović, Jovica, "Electrochemical synthesis of nanosized monetite powder and its electrophoretic deposition on titanium" in Colloids and Surfaces A-Physicochemical and Engineering Aspects, 341, no. 1-3 (2009):110-117,
https://doi.org/10.1016/j.colsurfa.2009.03.046 . .

TY  - JOUR
AU  - Đošić, Marija
AU  - Bibić, Nataša M.
AU  - Mitrić, Miodrag
AU  - Šiljegović, Milorad
AU  - Stojanović, Jovica
AU  - Jokić, Bojan
AU  - Janaćković, Đorđe
AU  - Mišković-Stanković, Vesna
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1531
AB  - Surface modification of hydroxyapatite (HA) thin films electrodeposited on titanium was conducted by ion implantation, using nitrogen and argon ions at different constant fluences of 1x10(15), 1x10(16) and 1x10(17) ions/cm(2). SEM and XRD analysis, as well as SRIM calculation, were used to monitor the changes induced by ion bombardment. In the case of HA film implanted with N4+ ions, the unit cell parameters and unit cell volume increase with increasing nitrogen ion fluences. Similarly, the unit cell parameters and unit cell volume increase after Ar6+ ions irradiation to a 1x10(15) ions/cm(2). At higher fluences, the unit cell parameters and unit cell volume decrease when argon ion fluences increase to 1x10(16) and 1x10(17) ions/cm(2). These structural changes are consequence of different mechanism of energy transfer of nitrogen and argon ions to HA film. For nitrogen ion irradiation electron energy loss is predominant, while for argon ion irradiation nuclear energy transfer to HA film prevails.
PB  - Natl Inst Optoelectronics, Bucharest-Magurele
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Electrodeposited hydroxyapatite thin films modified by ion beam irradiation
EP  - 1854
IS  - 11
SP  - 1848
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3872
ER  - 

@article{
author = "Đošić, Marija and Bibić, Nataša M. and Mitrić, Miodrag and Šiljegović, Milorad and Stojanović, Jovica and Jokić, Bojan and Janaćković, Đorđe and Mišković-Stanković, Vesna",
year = "2009",
abstract = "Surface modification of hydroxyapatite (HA) thin films electrodeposited on titanium was conducted by ion implantation, using nitrogen and argon ions at different constant fluences of 1x10(15), 1x10(16) and 1x10(17) ions/cm(2). SEM and XRD analysis, as well as SRIM calculation, were used to monitor the changes induced by ion bombardment. In the case of HA film implanted with N4+ ions, the unit cell parameters and unit cell volume increase with increasing nitrogen ion fluences. Similarly, the unit cell parameters and unit cell volume increase after Ar6+ ions irradiation to a 1x10(15) ions/cm(2). At higher fluences, the unit cell parameters and unit cell volume decrease when argon ion fluences increase to 1x10(16) and 1x10(17) ions/cm(2). These structural changes are consequence of different mechanism of energy transfer of nitrogen and argon ions to HA film. For nitrogen ion irradiation electron energy loss is predominant, while for argon ion irradiation nuclear energy transfer to HA film prevails.",
publisher = "Natl Inst Optoelectronics, Bucharest-Magurele",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Electrodeposited hydroxyapatite thin films modified by ion beam irradiation",
pages = "1854-1848",
number = "11",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3872"
}

Đošić, M., Bibić, N. M., Mitrić, M., Šiljegović, M., Stojanović, J., Jokić, B., Janaćković, Đ.,& Mišković-Stanković, V.. (2009). Electrodeposited hydroxyapatite thin films modified by ion beam irradiation. in Journal of Optoelectronics and Advanced Materials
Natl Inst Optoelectronics, Bucharest-Magurele., 11(11), 1848-1854.
https://hdl.handle.net/21.15107/rcub_vinar_3872

Đošić M, Bibić NM, Mitrić M, Šiljegović M, Stojanović J, Jokić B, Janaćković Đ, Mišković-Stanković V. Electrodeposited hydroxyapatite thin films modified by ion beam irradiation. in Journal of Optoelectronics and Advanced Materials. 2009;11(11):1848-1854.
https://hdl.handle.net/21.15107/rcub_vinar_3872 .

Đošić, Marija, Bibić, Nataša M., Mitrić, Miodrag, Šiljegović, Milorad, Stojanović, Jovica, Jokić, Bojan, Janaćković, Đorđe, Mišković-Stanković, Vesna, "Electrodeposited hydroxyapatite thin films modified by ion beam irradiation" in Journal of Optoelectronics and Advanced Materials, 11, no. 11 (2009):1848-1854,
https://hdl.handle.net/21.15107/rcub_vinar_3872 .

TY  - JOUR
AU  - Đošić, Marija
AU  - Mišković-Stanković, Vesna
AU  - Milonjić, Slobodan K.
AU  - Kačarević-Popović, Zorica M.
AU  - Bibić, Nataša M.
AU  - Stojanović, Jovica
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1237
AB  - Electrochemical synthesis of hydroxyapatite powders was performed galvanostatically from homogeneous solution of Na(2)H(2)EDTA center dot 2H(2)O, NaH2PO4 and CaCl2 at a concentration relationship Ca/EDTA/PO43- of 0.25/0.25/0.15 M at current densities of 137 and 207 mA cm(-2) and pH values of 9.0 and 12.0. The hydroxyapatite powders were characterized by X-ray diffraction, size distribution measurements, transmission electron microscopy, scanning electron microscopy and thermogravimetric and differential thermal analysis. The influence of the electrochemical synthesis parameters, e.g. applied current density and pH value, on the phase composition, crystallite size, morphology and thermal characteristics of hydroxyapatite powders were investigated.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Electrochemical synthesis and characterization of hydroxyapatite powders
EP  - 142
IS  - 1
SP  - 137
VL  - 111
DO  - 10.1016/j.matchemphys.2008.03.045
ER  - 

@article{
author = "Đošić, Marija and Mišković-Stanković, Vesna and Milonjić, Slobodan K. and Kačarević-Popović, Zorica M. and Bibić, Nataša M. and Stojanović, Jovica",
year = "2008",
abstract = "Electrochemical synthesis of hydroxyapatite powders was performed galvanostatically from homogeneous solution of Na(2)H(2)EDTA center dot 2H(2)O, NaH2PO4 and CaCl2 at a concentration relationship Ca/EDTA/PO43- of 0.25/0.25/0.15 M at current densities of 137 and 207 mA cm(-2) and pH values of 9.0 and 12.0. The hydroxyapatite powders were characterized by X-ray diffraction, size distribution measurements, transmission electron microscopy, scanning electron microscopy and thermogravimetric and differential thermal analysis. The influence of the electrochemical synthesis parameters, e.g. applied current density and pH value, on the phase composition, crystallite size, morphology and thermal characteristics of hydroxyapatite powders were investigated.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Electrochemical synthesis and characterization of hydroxyapatite powders",
pages = "142-137",
number = "1",
volume = "111",
doi = "10.1016/j.matchemphys.2008.03.045"
}

Đošić, M., Mišković-Stanković, V., Milonjić, S. K., Kačarević-Popović, Z. M., Bibić, N. M.,& Stojanović, J.. (2008). Electrochemical synthesis and characterization of hydroxyapatite powders. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 111(1), 137-142.
https://doi.org/10.1016/j.matchemphys.2008.03.045

Đošić M, Mišković-Stanković V, Milonjić SK, Kačarević-Popović ZM, Bibić NM, Stojanović J. Electrochemical synthesis and characterization of hydroxyapatite powders. in Materials Chemistry and Physics. 2008;111(1):137-142.
doi:10.1016/j.matchemphys.2008.03.045 .

Đošić, Marija, Mišković-Stanković, Vesna, Milonjić, Slobodan K., Kačarević-Popović, Zorica M., Bibić, Nataša M., Stojanović, Jovica, "Electrochemical synthesis and characterization of hydroxyapatite powders" in Materials Chemistry and Physics, 111, no. 1 (2008):137-142,
https://doi.org/10.1016/j.matchemphys.2008.03.045 . .

TY  - JOUR
AU  - Stojanović, Dušica
AU  - Vuković, Goran D.
AU  - Orlović, Aleksandar
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
AU  - Bibić, Nataša M.
AU  - Dramićanin, Miroslav
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1052
AB  - U okviru ovog rada prikazano je korišćenje metode natkritičnog CO2 u pokušaju da se izvrši deaglomeracija i poboljša disperzija nano-SiO2 čestica. Površinska modifikacija čestica izvršena je korišćenjem γ-methacryloxy-propyltrimethoxy silana. Kao metoda za poređenje uzeta je konvencionalna metoda prevlačenja nano-SiO2. Rezultati ukazuju na znatno poboljšanje disperzije i deaglomeracije pri korišćenju natkritičnog CO2. Analiza TEM i DLS rezultata ukazuje da je došlo do smanjenja prosečne veličine aglomerata upotrebom silanskog promotora. Termogravimetrijska analiza (TGA) pokazuje da su čestice tretirane pod natkritičnim uslovima termički stabilnije od čestica tretiranih konvencionalnom metodom. Rezultati su značajni za dobijanje nanopunila čija poboljšana disperzija i kvašenje polimerom može dovesti do dobijanja kompozita sa znatno poboljšanim mehaničkim svojstvima.
AB  - The supercritical CO2 method was used in order to perform deagglomeration and improve the dispersion of nano-SiO2 particles. γ-Met-hacryloxypropyltrimethoxysilane was used as the surface modification reagent. The conventional method for coating nano-SiO2 particles was used as the comparison method. Considerable improvement of the dispersion and deagglomeration was found using supercritical CO2. Analysis of the TEM micrographs and DLS results showed the reduction of the average size of the agglomerates with the silane coupling reagent. Thermogravimetric analysis (TGA) showed that the particles treated in super­critical CO2 were more thermally stable than particles treated by conventional method. Encapsulation of several particles coated with the silane coupling reagent was observed in certain parts of the primary particles. A chemical reaction takes place between the modification reagent, MEMO silane, and active hydroxyl groups on the surface of the nano-SiO2 particles. A larger quantity of MEMO silane reacted using the con­ventional method instead of the supercritical method. On the other hand, the reacted silane molecules were better arranged around the particle surface in the supercritical method because of the formation of covalent or self-assembled structures. Polycondensed structures were preferentially obtained in the conventional method. This was achieved by using supercritical CO2, which has a high solvating power such as organic solvents and physical properties (low viscosity, low surface tension and high diffusion coefficient) similar to gases on the other side. These properties enable the sufficient and uniform wettability of nano-SiO2 particle surfaces. These results are important for obtaining nanofillers with improved dispersion and polymer wettability. Such nanofillers can be used to obtain composite materials with considerably improved mechanical characteristics.
PB  - Savez hemijskih inženjera
T2  - Hemijska industrija
T1  - Disperzija i deaglomeracija nano-SiO2 čestica silanskim promotorima pod natkritičnim CO2
T1  - Dispersion and deagglomerat1on of nano-SiO2 particles with a silane modification reagent in supercritical CO2
EP  - 116
IS  - 3
SP  - 109
VL  - 61
DO  - 10.2298/HEMIND0703109S
ER  - 

@article{
author = "Stojanović, Dušica and Vuković, Goran D. and Orlović, Aleksandar and Uskoković, Petar and Aleksić, Radoslav and Bibić, Nataša M. and Dramićanin, Miroslav",
year = "2007",
abstract = "U okviru ovog rada prikazano je korišćenje metode natkritičnog CO2 u pokušaju da se izvrši deaglomeracija i poboljša disperzija nano-SiO2 čestica. Površinska modifikacija čestica izvršena je korišćenjem γ-methacryloxy-propyltrimethoxy silana. Kao metoda za poređenje uzeta je konvencionalna metoda prevlačenja nano-SiO2. Rezultati ukazuju na znatno poboljšanje disperzije i deaglomeracije pri korišćenju natkritičnog CO2. Analiza TEM i DLS rezultata ukazuje da je došlo do smanjenja prosečne veličine aglomerata upotrebom silanskog promotora. Termogravimetrijska analiza (TGA) pokazuje da su čestice tretirane pod natkritičnim uslovima termički stabilnije od čestica tretiranih konvencionalnom metodom. Rezultati su značajni za dobijanje nanopunila čija poboljšana disperzija i kvašenje polimerom može dovesti do dobijanja kompozita sa znatno poboljšanim mehaničkim svojstvima., The supercritical CO2 method was used in order to perform deagglomeration and improve the dispersion of nano-SiO2 particles. γ-Met-hacryloxypropyltrimethoxysilane was used as the surface modification reagent. The conventional method for coating nano-SiO2 particles was used as the comparison method. Considerable improvement of the dispersion and deagglomeration was found using supercritical CO2. Analysis of the TEM micrographs and DLS results showed the reduction of the average size of the agglomerates with the silane coupling reagent. Thermogravimetric analysis (TGA) showed that the particles treated in super­critical CO2 were more thermally stable than particles treated by conventional method. Encapsulation of several particles coated with the silane coupling reagent was observed in certain parts of the primary particles. A chemical reaction takes place between the modification reagent, MEMO silane, and active hydroxyl groups on the surface of the nano-SiO2 particles. A larger quantity of MEMO silane reacted using the con­ventional method instead of the supercritical method. On the other hand, the reacted silane molecules were better arranged around the particle surface in the supercritical method because of the formation of covalent or self-assembled structures. Polycondensed structures were preferentially obtained in the conventional method. This was achieved by using supercritical CO2, which has a high solvating power such as organic solvents and physical properties (low viscosity, low surface tension and high diffusion coefficient) similar to gases on the other side. These properties enable the sufficient and uniform wettability of nano-SiO2 particle surfaces. These results are important for obtaining nanofillers with improved dispersion and polymer wettability. Such nanofillers can be used to obtain composite materials with considerably improved mechanical characteristics.",
publisher = "Savez hemijskih inženjera",
journal = "Hemijska industrija",
title = "Disperzija i deaglomeracija nano-SiO2 čestica silanskim promotorima pod natkritičnim CO2, Dispersion and deagglomerat1on of nano-SiO2 particles with a silane modification reagent in supercritical CO2",
pages = "116-109",
number = "3",
volume = "61",
doi = "10.2298/HEMIND0703109S"
}

Stojanović, D., Vuković, G. D., Orlović, A., Uskoković, P., Aleksić, R., Bibić, N. M.,& Dramićanin, M.. (2007). Disperzija i deaglomeracija nano-SiO2 čestica silanskim promotorima pod natkritičnim CO2. in Hemijska industrija
Savez hemijskih inženjera., 61(3), 109-116.
https://doi.org/10.2298/HEMIND0703109S

Stojanović D, Vuković GD, Orlović A, Uskoković P, Aleksić R, Bibić NM, Dramićanin M. Disperzija i deaglomeracija nano-SiO2 čestica silanskim promotorima pod natkritičnim CO2. in Hemijska industrija. 2007;61(3):109-116.
doi:10.2298/HEMIND0703109S .

Stojanović, Dušica, Vuković, Goran D., Orlović, Aleksandar, Uskoković, Petar, Aleksić, Radoslav, Bibić, Nataša M., Dramićanin, Miroslav, "Disperzija i deaglomeracija nano-SiO2 čestica silanskim promotorima pod natkritičnim CO2" in Hemijska industrija, 61, no. 3 (2007):109-116,
https://doi.org/10.2298/HEMIND0703109S . .

TY  - JOUR
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
AU  - Bibić, Nataša M.
AU  - Dražić, Dragutin M.
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1100
AB  - The adhesion and electrochemical properties of epoxy coatings electrodeposited on hot-dip galvanized steel with and without passive films were investigated during exposure to 3% NaCl. The passive films were formed in hot air, in boiling water and by chromating. Adhesion was measured both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. Pretreatment of hot-dip galvanized steel with passive film formed in hot air increases both dry and wet adhesion strength of the epoxy coating compared to pretreatment with passive film formed in boiling water and chromate coating. The overall increase of wet adhesion for this sample was maintained throughout the whole investigated time period. It was shown that the change in adhesion of epoxy coating on a chromate coating is smallest of all investigated samples, although the initial value of adhesion on this surface had the lowest value. The corrosion stability of coated Zn samples pretreated by different methods, was investigated by electrochemical impedance spectroscopy and in the initial time of exposure to NaCl the highest values of pore resistance were also obtained for the epoxy coating on Zn pretreated in hot air, whereas the epoxy coating on a HDG steel with a chromate coating showed the smallest change in electrochemical properties (pore resistance, coating capacitance, charge-transfer resistance) during prolonged exposure time.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel
EP  - 330
IS  - 4
SP  - 323
VL  - 58
DO  - 10.1016/j.porgcoat.2007.01.011
ER  - 

@article{
author = "Bajat, Jelena and Mišković-Stanković, Vesna and Bibić, Nataša M. and Dražić, Dragutin M.",
year = "2007",
abstract = "The adhesion and electrochemical properties of epoxy coatings electrodeposited on hot-dip galvanized steel with and without passive films were investigated during exposure to 3% NaCl. The passive films were formed in hot air, in boiling water and by chromating. Adhesion was measured both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. Pretreatment of hot-dip galvanized steel with passive film formed in hot air increases both dry and wet adhesion strength of the epoxy coating compared to pretreatment with passive film formed in boiling water and chromate coating. The overall increase of wet adhesion for this sample was maintained throughout the whole investigated time period. It was shown that the change in adhesion of epoxy coating on a chromate coating is smallest of all investigated samples, although the initial value of adhesion on this surface had the lowest value. The corrosion stability of coated Zn samples pretreated by different methods, was investigated by electrochemical impedance spectroscopy and in the initial time of exposure to NaCl the highest values of pore resistance were also obtained for the epoxy coating on Zn pretreated in hot air, whereas the epoxy coating on a HDG steel with a chromate coating showed the smallest change in electrochemical properties (pore resistance, coating capacitance, charge-transfer resistance) during prolonged exposure time.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel",
pages = "330-323",
number = "4",
volume = "58",
doi = "10.1016/j.porgcoat.2007.01.011"
}

Bajat, J., Mišković-Stanković, V., Bibić, N. M.,& Dražić, D. M.. (2007). The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 58(4), 323-330.
https://doi.org/10.1016/j.porgcoat.2007.01.011

Bajat J, Mišković-Stanković V, Bibić NM, Dražić DM. The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel. in Progress in Organic Coatings. 2007;58(4):323-330.
doi:10.1016/j.porgcoat.2007.01.011 .

Bajat, Jelena, Mišković-Stanković, Vesna, Bibić, Nataša M., Dražić, Dragutin M., "The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel" in Progress in Organic Coatings, 58, no. 4 (2007):323-330,
https://doi.org/10.1016/j.porgcoat.2007.01.011 . .