TY  - JOUR
AU  - Mijailović, Daniel M.
AU  - Vukčević, Marija M.
AU  - Stević, Zoran
AU  - Kalijadis, Ana M.
AU  - Stojanovic, Dusica B.
AU  - Panić, Vladimir
AU  - Uskoković, Petar S.
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2268
AB  - Activated carbons with high specific surface area (even above 2000 m(2) g(-1)) and pronounced microporosity are prepared in two-stage process involving conventional carbonization of waste hemp fibers and subsequent activation by potassium hydroxide. Samples with considerably different surface and intrinsic micro-and mesoporous properties are obtained at different carbonization and activation conditions. The improvements of the capacitive properties are found upon increase in carbonization temperature, since it considerably influenced the specific surface area and the content of surface oxygen groups. Cyclic voltammetry experiments reveal the dependence of specific capacitance on the sweep rate due to the characteristic porous structure of the samples. The highest measured value in 1 M H2SO4 solution is 122 F g(-1). The electrochemical impedance data indicates eight-branch transmission line equivalent electric behavior of activated carbons.
PB  - Pennington : Electrochemical Society Inc.
T2  - Journal of the Electrochemical Society
T1  - Supercapacitive Performances of Activated Highly Microporous Natural Carbon Macrofibers
VL  - 164
IS  - 6
DO  - 10.1149/2.0581706jes
ER  - 

@article{
author = "Mijailović, Daniel M. and Vukčević, Marija M. and Stević, Zoran and Kalijadis, Ana M. and Stojanovic, Dusica B. and Panić, Vladimir and Uskoković, Petar S.",
year = "2017",
abstract = "Activated carbons with high specific surface area (even above 2000 m(2) g(-1)) and pronounced microporosity are prepared in two-stage process involving conventional carbonization of waste hemp fibers and subsequent activation by potassium hydroxide. Samples with considerably different surface and intrinsic micro-and mesoporous properties are obtained at different carbonization and activation conditions. The improvements of the capacitive properties are found upon increase in carbonization temperature, since it considerably influenced the specific surface area and the content of surface oxygen groups. Cyclic voltammetry experiments reveal the dependence of specific capacitance on the sweep rate due to the characteristic porous structure of the samples. The highest measured value in 1 M H2SO4 solution is 122 F g(-1). The electrochemical impedance data indicates eight-branch transmission line equivalent electric behavior of activated carbons.",
publisher = "Pennington : Electrochemical Society Inc.",
journal = "Journal of the Electrochemical Society",
title = "Supercapacitive Performances of Activated Highly Microporous Natural Carbon Macrofibers",
volume = "164",
number = "6",
doi = "10.1149/2.0581706jes"
}

Mijailović, D. M., Vukčević, M. M., Stević, Z., Kalijadis, A. M., Stojanovic, D. B., Panić, V.,& Uskoković, P. S.. (2017). Supercapacitive Performances of Activated Highly Microporous Natural Carbon Macrofibers. in Journal of the Electrochemical Society
Pennington : Electrochemical Society Inc.., 164(6).
https://doi.org/10.1149/2.0581706jes

Mijailović DM, Vukčević MM, Stević Z, Kalijadis AM, Stojanovic DB, Panić V, Uskoković PS. Supercapacitive Performances of Activated Highly Microporous Natural Carbon Macrofibers. in Journal of the Electrochemical Society. 2017;164(6).
doi:10.1149/2.0581706jes .

Mijailović, Daniel M., Vukčević, Marija M., Stević, Zoran, Kalijadis, Ana M., Stojanovic, Dusica B., Panić, Vladimir, Uskoković, Petar S., "Supercapacitive Performances of Activated Highly Microporous Natural Carbon Macrofibers" in Journal of the Electrochemical Society, 164, no. 6 (2017),
https://doi.org/10.1149/2.0581706jes . .

TY  - JOUR
AU  - Tasic, Ana
AU  - Rusmirović, Jelena
AU  - Nikolić, Jovana
AU  - Božić, Aleksandra R.
AU  - Pavlović, Vladimir B.
AU  - Marinković, Aleksandar D.
AU  - Uskoković, Petar S.
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2225
AB  - Production of high-performance nanocomposite materials obtained from unsaturated polyester resin, based on products of the waste poly(ethylene terephthalate) recycling, and modified multi-walled carbon nanotubes is presented. Di-hydroxy functional glycolysates, synthesized by catalytic depolymerization of poly(ethylene terephthalate) with propylene glycol, were used for the unsaturated polyester resin synthesis. The structure of the obtained glycolysis product and unsaturated polyester resin were characterized by using FTIR and NMR spectroscopy, and by acid, iodine, and hydroxyl value. Nanofillers were prepared by direct and two-step amidation of oxidized multi-walled carbon nanotubes. Direct amidation with diallylamine produced multi-walled carbon nanotube-diallylamine reactive nanofiller. Two-step modification with diamines: hexamethylenediamine and p-phenylenediamine gave multi-walled carbon nanotubehexamethylenediamine and multi-walled carbon nanotube-p-phenylenediamine nanofiller, respectively, whose amidation with methyl ester of linseed oil fatty acids gave multi-walled carbon nanotube-hexamethylenediamine/methyl ester of linseed oil fatty acid and multi-walled carbon nanotube-p-phenylenediamine/methyl ester of linseed oil fatty acid nanofiller, respectively. Influences of vinyl functionalities on mechanical properties of nanocomposite were analyzed from tensile strength (sigma(b)), elongation (epsilon(b)) and Young's modulus (E) determination. An increase of 97.4, 119 and 139% of sigma(b) was obtained for nanocomposites with addition of 0.25 wt.% of diallylamine, p-phenylenediamine/methyl ester of linseed oil fatty acid and hexamethylenediamine/methyl ester of linseed oil fatty acid multi-walled carbon nanotubes, respectively. Short techno-economic analysis, performed on the basis of fixed and variable unsaturated polyester resin production costs, showed satisfactory potential profit, which could be realized by the implementation of the presented technology.
PB  - Sage Publications Ltd, London
T2  - Journal of Composite Materials
T1  - Effect of the vinyl modification of multi-walled carbon nanotubes on the performances of waste poly(ethylene terephthalate)-based nanocomposites
VL  - 51
IS  - 4
SP  - 491
EP  - 505
DO  - 10.1177/0021998316648757
ER  - 

@article{
author = "Tasic, Ana and Rusmirović, Jelena and Nikolić, Jovana and Božić, Aleksandra R. and Pavlović, Vladimir B. and Marinković, Aleksandar D. and Uskoković, Petar S.",
year = "2017",
abstract = "Production of high-performance nanocomposite materials obtained from unsaturated polyester resin, based on products of the waste poly(ethylene terephthalate) recycling, and modified multi-walled carbon nanotubes is presented. Di-hydroxy functional glycolysates, synthesized by catalytic depolymerization of poly(ethylene terephthalate) with propylene glycol, were used for the unsaturated polyester resin synthesis. The structure of the obtained glycolysis product and unsaturated polyester resin were characterized by using FTIR and NMR spectroscopy, and by acid, iodine, and hydroxyl value. Nanofillers were prepared by direct and two-step amidation of oxidized multi-walled carbon nanotubes. Direct amidation with diallylamine produced multi-walled carbon nanotube-diallylamine reactive nanofiller. Two-step modification with diamines: hexamethylenediamine and p-phenylenediamine gave multi-walled carbon nanotubehexamethylenediamine and multi-walled carbon nanotube-p-phenylenediamine nanofiller, respectively, whose amidation with methyl ester of linseed oil fatty acids gave multi-walled carbon nanotube-hexamethylenediamine/methyl ester of linseed oil fatty acid and multi-walled carbon nanotube-p-phenylenediamine/methyl ester of linseed oil fatty acid nanofiller, respectively. Influences of vinyl functionalities on mechanical properties of nanocomposite were analyzed from tensile strength (sigma(b)), elongation (epsilon(b)) and Young's modulus (E) determination. An increase of 97.4, 119 and 139% of sigma(b) was obtained for nanocomposites with addition of 0.25 wt.% of diallylamine, p-phenylenediamine/methyl ester of linseed oil fatty acid and hexamethylenediamine/methyl ester of linseed oil fatty acid multi-walled carbon nanotubes, respectively. Short techno-economic analysis, performed on the basis of fixed and variable unsaturated polyester resin production costs, showed satisfactory potential profit, which could be realized by the implementation of the presented technology.",
publisher = "Sage Publications Ltd, London",
journal = "Journal of Composite Materials",
title = "Effect of the vinyl modification of multi-walled carbon nanotubes on the performances of waste poly(ethylene terephthalate)-based nanocomposites",
volume = "51",
number = "4",
pages = "491-505",
doi = "10.1177/0021998316648757"
}

Tasic, A., Rusmirović, J., Nikolić, J., Božić, A. R., Pavlović, V. B., Marinković, A. D.,& Uskoković, P. S.. (2017). Effect of the vinyl modification of multi-walled carbon nanotubes on the performances of waste poly(ethylene terephthalate)-based nanocomposites. in Journal of Composite Materials
Sage Publications Ltd, London., 51(4), 491-505.
https://doi.org/10.1177/0021998316648757

Tasic A, Rusmirović J, Nikolić J, Božić AR, Pavlović VB, Marinković AD, Uskoković PS. Effect of the vinyl modification of multi-walled carbon nanotubes on the performances of waste poly(ethylene terephthalate)-based nanocomposites. in Journal of Composite Materials. 2017;51(4):491-505.
doi:10.1177/0021998316648757 .

Tasic, Ana, Rusmirović, Jelena, Nikolić, Jovana, Božić, Aleksandra R., Pavlović, Vladimir B., Marinković, Aleksandar D., Uskoković, Petar S., "Effect of the vinyl modification of multi-walled carbon nanotubes on the performances of waste poly(ethylene terephthalate)-based nanocomposites" in Journal of Composite Materials, 51, no. 4 (2017):491-505,
https://doi.org/10.1177/0021998316648757 . .

TY  - JOUR
AU  - Brkovic, Danijela V.
AU  - Pavlović, Vladimir B.
AU  - Pavlović, Vera P.
AU  - Obradovic, Nina
AU  - Mitrić, Miodrag
AU  - Stevanović, Sanja
AU  - Vlahovic, Branislav
AU  - Uskoković, Petar S.
AU  - Marinković, Aleksandar D.
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2152
AB  - The structural characteristics of polymer nanocomposites with functionalized multiwall carbon nanotubes (MWCNTs) in poly(methyl methacrylate) matrix have been studied in relation to nanofiller loading and surface functionality. Different functional groups have been covalently attached on the MWCNTs sidewalls in order to induce interfacial interactions at nanofiller/polymer interface, which resulted in an improved nanomechanical features. Structural properties of nanocomposites, studied with XRD and Raman analysis, indicated the most pronounced decrease in a degree of amorphousness for samples containing 0.5 and 1 wt% of MWCNTs functionalized with dapsone (dapson-MWCNT) and diethyl malonate (dem-MWCNT). SEM and TEM micrographs confirmed improved dispersibility of the MWCNTs modified with aromatic structure of dapsone inside PMMA matrix. A significant increase in a glass transition temperature of over 60 degrees C has been found for the 1 wt% dapson-MWCNT nanocomposite. Additional modification of dapson-MWCNT by further increasing aromaticity and voluminosity of attached moiety (fid-MWCNT), showed 30 degrees C increases in a glass transition temperature at 4 wt% of nanofiller loading, which is similar to shift of 37 degrees C with loading of MWCNTs modified with ester terminal group. A maximum increase of 56% of reduced modulus and 86% of hardness was obtained for 1 wt% loading of dapson-MWCNT nanofiller.
PB  - Wiley, Hoboken
T2  - Polymer Composites
T1  - Structural Properties of the Multiwall Carbon Nanotubes/Poly(Methyl Methacrylate) Nanocomposites: Effect of the Multiwall Carbon Nanotubes Covalent Functionalization
VL  - 38
DO  - 10.1002/pc.23996
ER  - 

@article{
author = "Brkovic, Danijela V. and Pavlović, Vladimir B. and Pavlović, Vera P. and Obradovic, Nina and Mitrić, Miodrag and Stevanović, Sanja and Vlahovic, Branislav and Uskoković, Petar S. and Marinković, Aleksandar D.",
year = "2017",
abstract = "The structural characteristics of polymer nanocomposites with functionalized multiwall carbon nanotubes (MWCNTs) in poly(methyl methacrylate) matrix have been studied in relation to nanofiller loading and surface functionality. Different functional groups have been covalently attached on the MWCNTs sidewalls in order to induce interfacial interactions at nanofiller/polymer interface, which resulted in an improved nanomechanical features. Structural properties of nanocomposites, studied with XRD and Raman analysis, indicated the most pronounced decrease in a degree of amorphousness for samples containing 0.5 and 1 wt% of MWCNTs functionalized with dapsone (dapson-MWCNT) and diethyl malonate (dem-MWCNT). SEM and TEM micrographs confirmed improved dispersibility of the MWCNTs modified with aromatic structure of dapsone inside PMMA matrix. A significant increase in a glass transition temperature of over 60 degrees C has been found for the 1 wt% dapson-MWCNT nanocomposite. Additional modification of dapson-MWCNT by further increasing aromaticity and voluminosity of attached moiety (fid-MWCNT), showed 30 degrees C increases in a glass transition temperature at 4 wt% of nanofiller loading, which is similar to shift of 37 degrees C with loading of MWCNTs modified with ester terminal group. A maximum increase of 56% of reduced modulus and 86% of hardness was obtained for 1 wt% loading of dapson-MWCNT nanofiller.",
publisher = "Wiley, Hoboken",
journal = "Polymer Composites",
title = "Structural Properties of the Multiwall Carbon Nanotubes/Poly(Methyl Methacrylate) Nanocomposites: Effect of the Multiwall Carbon Nanotubes Covalent Functionalization",
volume = "38",
doi = "10.1002/pc.23996"
}

Brkovic, D. V., Pavlović, V. B., Pavlović, V. P., Obradovic, N., Mitrić, M., Stevanović, S., Vlahovic, B., Uskoković, P. S.,& Marinković, A. D.. (2017). Structural Properties of the Multiwall Carbon Nanotubes/Poly(Methyl Methacrylate) Nanocomposites: Effect of the Multiwall Carbon Nanotubes Covalent Functionalization. in Polymer Composites
Wiley, Hoboken., 38.
https://doi.org/10.1002/pc.23996

Brkovic DV, Pavlović VB, Pavlović VP, Obradovic N, Mitrić M, Stevanović S, Vlahovic B, Uskoković PS, Marinković AD. Structural Properties of the Multiwall Carbon Nanotubes/Poly(Methyl Methacrylate) Nanocomposites: Effect of the Multiwall Carbon Nanotubes Covalent Functionalization. in Polymer Composites. 2017;38.
doi:10.1002/pc.23996 .

Brkovic, Danijela V., Pavlović, Vladimir B., Pavlović, Vera P., Obradovic, Nina, Mitrić, Miodrag, Stevanović, Sanja, Vlahovic, Branislav, Uskoković, Petar S., Marinković, Aleksandar D., "Structural Properties of the Multiwall Carbon Nanotubes/Poly(Methyl Methacrylate) Nanocomposites: Effect of the Multiwall Carbon Nanotubes Covalent Functionalization" in Polymer Composites, 38 (2017),
https://doi.org/10.1002/pc.23996 . .

TY  - JOUR
AU  - Brkovic, Danijela V
AU  - Avramov Ivić, Milka
AU  - Rakić, Vesna M.
AU  - Valentini, Luca
AU  - Uskoković, Petar S.
AU  - Marinković, Aleksandar D.
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1663
AB  - Covalent sidewall functionalization of multiwalled carbon nanotubes (MWCNTs) has been performed using two approaches, direct and indirect cycloaddition through diethyl malonate, based on the Bingel reaction. The results revealed that functionalized MWCNTs demonstrated enhanced electrical properties and significantly lower sheet resistance, especially after electric field thermal assisted annealing at 80 degrees C was performed. The presence of 1,3-dicarbonyl compounds caused the surface of MWCNTs to be more hydrophilic, approachable for the electrolyte and improved the capacitance performance of Au/MWCNTs electrodes. The modified MWCNTs have been incorporated into nanocomposites by using solution mixing method with polyaniline and drop-casting resulting mixture on the paper substrate. The reduction in the sheet resistance with increasing the content of MWCNTs in the prepared nanocomposite films has been achieved.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Journal of Physics and Chemistry of Solids
T1  - Electrical and morphological characterization of multiwalled carbon nanotubes functionalized via the Bingel reaction
VL  - 83
SP  - 121
EP  - 134
DO  - 10.1016/j.jpcs.2015.04.004
ER  - 

@article{
author = "Brkovic, Danijela V and Avramov Ivić, Milka and Rakić, Vesna M. and Valentini, Luca and Uskoković, Petar S. and Marinković, Aleksandar D.",
year = "2015",
abstract = "Covalent sidewall functionalization of multiwalled carbon nanotubes (MWCNTs) has been performed using two approaches, direct and indirect cycloaddition through diethyl malonate, based on the Bingel reaction. The results revealed that functionalized MWCNTs demonstrated enhanced electrical properties and significantly lower sheet resistance, especially after electric field thermal assisted annealing at 80 degrees C was performed. The presence of 1,3-dicarbonyl compounds caused the surface of MWCNTs to be more hydrophilic, approachable for the electrolyte and improved the capacitance performance of Au/MWCNTs electrodes. The modified MWCNTs have been incorporated into nanocomposites by using solution mixing method with polyaniline and drop-casting resulting mixture on the paper substrate. The reduction in the sheet resistance with increasing the content of MWCNTs in the prepared nanocomposite films has been achieved.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Journal of Physics and Chemistry of Solids",
title = "Electrical and morphological characterization of multiwalled carbon nanotubes functionalized via the Bingel reaction",
volume = "83",
pages = "121-134",
doi = "10.1016/j.jpcs.2015.04.004"
}

Brkovic, D. V., Avramov Ivić, M., Rakić, V. M., Valentini, L., Uskoković, P. S.,& Marinković, A. D.. (2015). Electrical and morphological characterization of multiwalled carbon nanotubes functionalized via the Bingel reaction. in Journal of Physics and Chemistry of Solids
Oxford : Pergamon-Elsevier Science Ltd., 83, 121-134.
https://doi.org/10.1016/j.jpcs.2015.04.004

Brkovic DV, Avramov Ivić M, Rakić VM, Valentini L, Uskoković PS, Marinković AD. Electrical and morphological characterization of multiwalled carbon nanotubes functionalized via the Bingel reaction. in Journal of Physics and Chemistry of Solids. 2015;83:121-134.
doi:10.1016/j.jpcs.2015.04.004 .

Brkovic, Danijela V, Avramov Ivić, Milka, Rakić, Vesna M., Valentini, Luca, Uskoković, Petar S., Marinković, Aleksandar D., "Electrical and morphological characterization of multiwalled carbon nanotubes functionalized via the Bingel reaction" in Journal of Physics and Chemistry of Solids, 83 (2015):121-134,
https://doi.org/10.1016/j.jpcs.2015.04.004 . .

TY  - JOUR
AU  - Prlainović, Nevena Ž.
AU  - Bezbradica, Dejan I.
AU  - Knežević-Jugović, Zorica
AU  - Stevanović, Sanja
AU  - Avramov Ivić, Milka
AU  - Uskoković, Petar S.
AU  - Mijin, Dušan
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1297
AB  - In this work lipase from Candida rugosa was adsorbed on unmodified surface of multi walled carbon nanotubes (raw-MWCIsIT). The effects of immobilization time, initial enzyme concentration and buffer ionic strength on enzyme loading and activity of immobilized preparations were tested. High loadings are attained. The immobilized enzyme obtained at lowest initial enzyme concentration and high ionic strength retained 85% of initial enzyme activity. It is assumed that immobilization on hydrophobic surface led to conformational changes that resulted in the adsorption of lipase in active conformation. Immobilized preparations were characterized, with FT-IR spectroscopy, AFM, and cyclic voltammetry.
PB  - Korean Society of Industrial Engineering Chemistry
T2  - Journal of Industrial and Engineering Chemistry
T1  - Adsorption of lipase from Candida rugosa on multi walled carbon nanotubes
VL  - 19
IS  - 1
SP  - 279
EP  - 285
DO  - 10.1016/j.jiec.2012.08.012
ER  - 

@article{
author = "Prlainović, Nevena Ž. and Bezbradica, Dejan I. and Knežević-Jugović, Zorica and Stevanović, Sanja and Avramov Ivić, Milka and Uskoković, Petar S. and Mijin, Dušan",
year = "2013",
abstract = "In this work lipase from Candida rugosa was adsorbed on unmodified surface of multi walled carbon nanotubes (raw-MWCIsIT). The effects of immobilization time, initial enzyme concentration and buffer ionic strength on enzyme loading and activity of immobilized preparations were tested. High loadings are attained. The immobilized enzyme obtained at lowest initial enzyme concentration and high ionic strength retained 85% of initial enzyme activity. It is assumed that immobilization on hydrophobic surface led to conformational changes that resulted in the adsorption of lipase in active conformation. Immobilized preparations were characterized, with FT-IR spectroscopy, AFM, and cyclic voltammetry.",
publisher = "Korean Society of Industrial Engineering Chemistry",
journal = "Journal of Industrial and Engineering Chemistry",
title = "Adsorption of lipase from Candida rugosa on multi walled carbon nanotubes",
volume = "19",
number = "1",
pages = "279-285",
doi = "10.1016/j.jiec.2012.08.012"
}

Prlainović, N. Ž., Bezbradica, D. I., Knežević-Jugović, Z., Stevanović, S., Avramov Ivić, M., Uskoković, P. S.,& Mijin, D.. (2013). Adsorption of lipase from Candida rugosa on multi walled carbon nanotubes. in Journal of Industrial and Engineering Chemistry
Korean Society of Industrial Engineering Chemistry., 19(1), 279-285.
https://doi.org/10.1016/j.jiec.2012.08.012

Prlainović NŽ, Bezbradica DI, Knežević-Jugović Z, Stevanović S, Avramov Ivić M, Uskoković PS, Mijin D. Adsorption of lipase from Candida rugosa on multi walled carbon nanotubes. in Journal of Industrial and Engineering Chemistry. 2013;19(1):279-285.
doi:10.1016/j.jiec.2012.08.012 .

Prlainović, Nevena Ž., Bezbradica, Dejan I., Knežević-Jugović, Zorica, Stevanović, Sanja, Avramov Ivić, Milka, Uskoković, Petar S., Mijin, Dušan, "Adsorption of lipase from Candida rugosa on multi walled carbon nanotubes" in Journal of Industrial and Engineering Chemistry, 19, no. 1 (2013):279-285,
https://doi.org/10.1016/j.jiec.2012.08.012 . .

TY  - JOUR
AU  - Vukovic, Goran D.
AU  - Obradović, Maja
AU  - Marinković, Aleksandar D.
AU  - Rogan, Jelena R.
AU  - Uskoković, Petar S.
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/801
AB  - Multi-walled carbon nanotubes (MWCNTs) were used as a support for Pt nanoparticles prepared by the microwave-assisted polyol method. The MWCNTs were pretreated by chemical oxidation (o-MWCNTs) followed by modification by ethylenediamine (eda-MWCNTs). Characterization of both oxidized and eda-modified materials by UV-spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy revealed that the modification by eda leads to (i) agglomeration of the MWCNTs, (ii) a decrease in the capacitance of the material and (iii) reduced rate of electron transfer between the MWCNTs and solution species. However, the Pt loading of Pt/o-MWCNTs was only 2 mass% while the loading of Pt/eda-MWCNTs was 20 mass%. Much higher efficiency of Pt deposition on eda-MWCNTs than on o-MWCNTs was ascribed to the shift in pH(pzc) value of the MWCNT surface from 2.43 to 5.91 upon modification by eda. Transmission electron microscopy revealed that the mean diameter of the Pt particles in Pt/eda-MWCNTs is 2.5 +/- 0.5 nm and that their distribution on the support is homogenous with no evidence of pronounced particle agglomeration. Cyclic voltammetry of a Pt/eda-MWCNT thin film indicated a clean Pt surface with well-resolved peaks characteristic of polycrystalline Pt. Its electrocatalytic activity for oxygen reduction was examined and the results corresponded to the commercial Pt nanocatalyst. This study shows that modification of o-MWCNTs by eda helps to achieve homogenous distribution of small Pt nanoparticles and does not impede its electrocatalytic activity.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support
VL  - 130
IS  - 1-2
SP  - 657
EP  - 664
DO  - 10.1016/j.matchemphys.2011.07.046
ER  - 

@article{
author = "Vukovic, Goran D. and Obradović, Maja and Marinković, Aleksandar D. and Rogan, Jelena R. and Uskoković, Petar S. and Radmilović, Velimir R. and Gojković, Snežana Lj.",
year = "2011",
abstract = "Multi-walled carbon nanotubes (MWCNTs) were used as a support for Pt nanoparticles prepared by the microwave-assisted polyol method. The MWCNTs were pretreated by chemical oxidation (o-MWCNTs) followed by modification by ethylenediamine (eda-MWCNTs). Characterization of both oxidized and eda-modified materials by UV-spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy revealed that the modification by eda leads to (i) agglomeration of the MWCNTs, (ii) a decrease in the capacitance of the material and (iii) reduced rate of electron transfer between the MWCNTs and solution species. However, the Pt loading of Pt/o-MWCNTs was only 2 mass% while the loading of Pt/eda-MWCNTs was 20 mass%. Much higher efficiency of Pt deposition on eda-MWCNTs than on o-MWCNTs was ascribed to the shift in pH(pzc) value of the MWCNT surface from 2.43 to 5.91 upon modification by eda. Transmission electron microscopy revealed that the mean diameter of the Pt particles in Pt/eda-MWCNTs is 2.5 +/- 0.5 nm and that their distribution on the support is homogenous with no evidence of pronounced particle agglomeration. Cyclic voltammetry of a Pt/eda-MWCNT thin film indicated a clean Pt surface with well-resolved peaks characteristic of polycrystalline Pt. Its electrocatalytic activity for oxygen reduction was examined and the results corresponded to the commercial Pt nanocatalyst. This study shows that modification of o-MWCNTs by eda helps to achieve homogenous distribution of small Pt nanoparticles and does not impede its electrocatalytic activity.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support",
volume = "130",
number = "1-2",
pages = "657-664",
doi = "10.1016/j.matchemphys.2011.07.046"
}

Vukovic, G. D., Obradović, M., Marinković, A. D., Rogan, J. R., Uskoković, P. S., Radmilović, V. R.,& Gojković, S. Lj.. (2011). Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 130(1-2), 657-664.
https://doi.org/10.1016/j.matchemphys.2011.07.046

Vukovic GD, Obradović M, Marinković AD, Rogan JR, Uskoković PS, Radmilović VR, Gojković SL. Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support. in Materials Chemistry and Physics. 2011;130(1-2):657-664.
doi:10.1016/j.matchemphys.2011.07.046 .

Vukovic, Goran D., Obradović, Maja, Marinković, Aleksandar D., Rogan, Jelena R., Uskoković, Petar S., Radmilović, Velimir R., Gojković, Snežana Lj., "Ethylenediamine-modified multiwall carbon nanotubes as a Pt catalyst support" in Materials Chemistry and Physics, 130, no. 1-2 (2011):657-664,
https://doi.org/10.1016/j.matchemphys.2011.07.046 . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica B.
AU  - Nikolić, Nebojša D.
AU  - Živković, Irena
AU  - Uskoković, Petar S.
AU  - Aleksić, Radoslav
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/879
AB  - The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. .
AB  - Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .
PB  - Vojnotehnički institut, Beograd
T2  - Scientific Technical Review
T1  - The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process
T1  - Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa
VL  - 61
IS  - 3-4
SP  - 34
EP  - 38
UR  - https://hdl.handle.net/21.15107/rcub_cer_879
ER  - 

@article{
author = "Obradović, Vera and Kojović, Aleksandar and Stojanović, Dušica B. and Nikolić, Nebojša D. and Živković, Irena and Uskoković, Petar S. and Aleksić, Radoslav",
year = "2011",
abstract = "The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. ., Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .",
publisher = "Vojnotehnički institut, Beograd",
journal = "Scientific Technical Review",
title = "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process, Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa",
volume = "61",
number = "3-4",
pages = "34-38",
url = "https://hdl.handle.net/21.15107/rcub_cer_879"
}

Obradović, V., Kojović, A., Stojanović, D. B., Nikolić, N. D., Živković, I., Uskoković, P. S.,& Aleksić, R.. (2011). The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review
Vojnotehnički institut, Beograd., 61(3-4), 34-38.
https://hdl.handle.net/21.15107/rcub_cer_879

Obradović V, Kojović A, Stojanović DB, Nikolić ND, Živković I, Uskoković PS, Aleksić R. The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review. 2011;61(3-4):34-38.
https://hdl.handle.net/21.15107/rcub_cer_879 .

Obradović, Vera, Kojović, Aleksandar, Stojanović, Dušica B., Nikolić, Nebojša D., Živković, Irena, Uskoković, Petar S., Aleksić, Radoslav, "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process" in Scientific Technical Review, 61, no. 3-4 (2011):34-38,
https://hdl.handle.net/21.15107/rcub_cer_879 .

TY  - JOUR
AU  - Obradović, Maja
AU  - Vuković, G.D.
AU  - Stevanović, Sanja
AU  - Panić, Vladimir
AU  - Uskoković, Petar S.
AU  - Kowal, Andrzej
AU  - Gojković, Snežana Lj.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/582
AB  - Two samples of commercial multi-walled carbon nanotubes (Sigma-Aldrich and Sun Nanotech) and a sample of carbon black (Vulcan XC-72R) were investigated in raw state and after the activation in nitric and sulfuric acid by ultrasound agitation. Atomic force microscopy revealed that activated Sigma-Aldrich nanotubes are straight with corrugated walls (bamboo-like structure), while Sun Nanotech nanotubes are tortuous with smooth walls. Fourier transform infrared spectroscopy showed that abundance of oxygen-containing functional groups was formed on both Sigma-Aldrich and Sun Nanotech carbon nanotubes, as well as on carbon black surfaces. Electrochemical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the electrochemically active surface area of all carbon samples is expanded, charge storage ability is enhanced and the electron-transfer kinetics, probed by Fe (CN)6 3 - / Fe (CN)6 4 - redox couple, is promoted upon activation. The characteristics of carbon nanotubes were superior to carbon black. Morphology of the carbon nanotubes was found to be important; nanotubes with corrugated walls showed faster electron-transfer and pseudocapacitive redox kinetics than nanotubes with smooth walls. This was explained by the higher proportion of edge and defect sites, which are known as more electrochemically active than the walls of uniform graphene structure.
PB  - Elsevier
T2  - Journal of Electroanalytical Chemistry
T1  - A comparative study of the electrochemical properties of carbon nanotubes and carbon black
VL  - 634
IS  - 1
SP  - 22
EP  - 30
DO  - 10.1016/j.jelechem.2009.07.001
ER  - 

@article{
author = "Obradović, Maja and Vuković, G.D. and Stevanović, Sanja and Panić, Vladimir and Uskoković, Petar S. and Kowal, Andrzej and Gojković, Snežana Lj.",
year = "2009",
abstract = "Two samples of commercial multi-walled carbon nanotubes (Sigma-Aldrich and Sun Nanotech) and a sample of carbon black (Vulcan XC-72R) were investigated in raw state and after the activation in nitric and sulfuric acid by ultrasound agitation. Atomic force microscopy revealed that activated Sigma-Aldrich nanotubes are straight with corrugated walls (bamboo-like structure), while Sun Nanotech nanotubes are tortuous with smooth walls. Fourier transform infrared spectroscopy showed that abundance of oxygen-containing functional groups was formed on both Sigma-Aldrich and Sun Nanotech carbon nanotubes, as well as on carbon black surfaces. Electrochemical properties were studied by cyclic voltammetry and electrochemical impedance spectroscopy. It was found that the electrochemically active surface area of all carbon samples is expanded, charge storage ability is enhanced and the electron-transfer kinetics, probed by Fe (CN)6 3 - / Fe (CN)6 4 - redox couple, is promoted upon activation. The characteristics of carbon nanotubes were superior to carbon black. Morphology of the carbon nanotubes was found to be important; nanotubes with corrugated walls showed faster electron-transfer and pseudocapacitive redox kinetics than nanotubes with smooth walls. This was explained by the higher proportion of edge and defect sites, which are known as more electrochemically active than the walls of uniform graphene structure.",
publisher = "Elsevier",
journal = "Journal of Electroanalytical Chemistry",
title = "A comparative study of the electrochemical properties of carbon nanotubes and carbon black",
volume = "634",
number = "1",
pages = "22-30",
doi = "10.1016/j.jelechem.2009.07.001"
}

Obradović, M., Vuković, G.D., Stevanović, S., Panić, V., Uskoković, P. S., Kowal, A.,& Gojković, S. Lj.. (2009). A comparative study of the electrochemical properties of carbon nanotubes and carbon black. in Journal of Electroanalytical Chemistry
Elsevier., 634(1), 22-30.
https://doi.org/10.1016/j.jelechem.2009.07.001

Obradović M, Vuković G, Stevanović S, Panić V, Uskoković PS, Kowal A, Gojković SL. A comparative study of the electrochemical properties of carbon nanotubes and carbon black. in Journal of Electroanalytical Chemistry. 2009;634(1):22-30.
doi:10.1016/j.jelechem.2009.07.001 .

Obradović, Maja, Vuković, G.D., Stevanović, Sanja, Panić, Vladimir, Uskoković, Petar S., Kowal, Andrzej, Gojković, Snežana Lj., "A comparative study of the electrochemical properties of carbon nanotubes and carbon black" in Journal of Electroanalytical Chemistry, 634, no. 1 (2009):22-30,
https://doi.org/10.1016/j.jelechem.2009.07.001 . .

TY  - JOUR
AU  - Vuković, G.
AU  - Marinković, Aleksandar D.
AU  - Obradović, Maja
AU  - Radmilović, V.
AU  - Čolić, M.
AU  - Aleksić, Radoslav
AU  - Uskoković, Petar S.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/584
AB  - Surface functionalization of multi-walled carbon nanotubes (MWCNTs), with amino groups via chemical modification of carboxyl groups introduced on the nanotube surface, using O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (N-HATU) and N,N-diisopropylethylamine (DIEA) is reported. The N-HATU coupling agent provides faster reaction rate and the reaction occurs at lower temperature compared to amidation and acylation-amidation chemistry. The amines, 1,6-hexanediamine (HDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and 1,4-phenylenediamine (PDA) were used. The resulting materials were characterized with different techniques such as FTIR, XRD, elemental analysis, TGA, TEM, UV-vis spectroscopy and cyclic voltammetry. MWCNTs functionalized with PDA posses the best dispersibility and electron transfer properties in comparison to the others amines. Functionalized MWCNTs, at the concentrations between 1 and 50 μg ml-1, were not cytotoxic for the fibroblast L929 cell line. However, the concentrations of MWCNTs higher of 10 μg ml-1 reduced cell growth and this effect correlated positively with the degree of their uptake by L929 cells.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes
VL  - 255
IS  - 18
SP  - 8067
EP  - 8075
DO  - 10.1016/j.apsusc.2009.05.016
ER  - 

@article{
author = "Vuković, G. and Marinković, Aleksandar D. and Obradović, Maja and Radmilović, V. and Čolić, M. and Aleksić, Radoslav and Uskoković, Petar S.",
year = "2009",
abstract = "Surface functionalization of multi-walled carbon nanotubes (MWCNTs), with amino groups via chemical modification of carboxyl groups introduced on the nanotube surface, using O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (N-HATU) and N,N-diisopropylethylamine (DIEA) is reported. The N-HATU coupling agent provides faster reaction rate and the reaction occurs at lower temperature compared to amidation and acylation-amidation chemistry. The amines, 1,6-hexanediamine (HDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and 1,4-phenylenediamine (PDA) were used. The resulting materials were characterized with different techniques such as FTIR, XRD, elemental analysis, TGA, TEM, UV-vis spectroscopy and cyclic voltammetry. MWCNTs functionalized with PDA posses the best dispersibility and electron transfer properties in comparison to the others amines. Functionalized MWCNTs, at the concentrations between 1 and 50 μg ml-1, were not cytotoxic for the fibroblast L929 cell line. However, the concentrations of MWCNTs higher of 10 μg ml-1 reduced cell growth and this effect correlated positively with the degree of their uptake by L929 cells.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes",
volume = "255",
number = "18",
pages = "8067-8075",
doi = "10.1016/j.apsusc.2009.05.016"
}

Vuković, G., Marinković, A. D., Obradović, M., Radmilović, V., Čolić, M., Aleksić, R.,& Uskoković, P. S.. (2009). Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes. in Applied Surface Science
Elsevier., 255(18), 8067-8075.
https://doi.org/10.1016/j.apsusc.2009.05.016

Vuković G, Marinković AD, Obradović M, Radmilović V, Čolić M, Aleksić R, Uskoković PS. Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes. in Applied Surface Science. 2009;255(18):8067-8075.
doi:10.1016/j.apsusc.2009.05.016 .

Vuković, G., Marinković, Aleksandar D., Obradović, Maja, Radmilović, V., Čolić, M., Aleksić, Radoslav, Uskoković, Petar S., "Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes" in Applied Surface Science, 255, no. 18 (2009):8067-8075,
https://doi.org/10.1016/j.apsusc.2009.05.016 . .