TY  - JOUR
AU  - Čolić, Miodrag
AU  - Dzopalić, Tanja
AU  - Tomić, Sergej
AU  - Rajković, Jelena
AU  - Rudolf, Rebeka
AU  - Vuković, Goran D.
AU  - Marinković, Aleksandar
AU  - Uskoković, Petar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2782
AB  - The protocols for the preparation of dendritic cells (DCs) as cancer vaccines based on stimulation of Toll-like receptors (TLRs) are very promising. In this study we covalently attached 7-thia-8-oxoguanosine (7-TOG), a selective endosomal TLR7, to previously oxidized multi-walled carbon nanotubes (o-MWCNTs) (mass ratio 1:5.6, respectively), and tested their ability to activate human monocyte-derived (Mo)DCs. Light, confocal and transmission electron microscopy confirmed efficient phagocytosis of 7-TOG-MWCNTs by MoDCs and their efficient delivery to TLR7(+) endosomes. The biocompatibility studies showed that 7-TOG-MWCNTs, at concentrations lower than 100 mu g/ml, were not cytotoxic for MoDCs. 7-TOG-MV/CNTs (50 mu g/ml) up-regulated CD86 expression, allostimulatory activity, T helper (Th)1- and Th17-polarizing capability of MoDCs. The same concentration of soluble 7-TOG, alone or in combination with control o-MWCNTs, did not have such effects. It can be hypothesized that the efficacy of 7-TOG-MWCNTs in stimulating MoDCs was a consequence of increased intracellular concentration of 7-TOG after internalization of the nano-complexes, because similar Th-polarizing capability could be induced with 10-times higher concentrations of soluble 7-TOG. In conclusion, our results suggest that functionalized MWCNTs may be a promising system for the delivery of drugs to intracellular targets, in order to improve the immunogenic potential of DCs for therapeutic purposes.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Carbon
T1  - Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells
EP  - 287
SP  - 273
VL  - 67
DO  - 10.1016/j.carbon.2013.09.090
ER  - 

@article{
author = "Čolić, Miodrag and Dzopalić, Tanja and Tomić, Sergej and Rajković, Jelena and Rudolf, Rebeka and Vuković, Goran D. and Marinković, Aleksandar and Uskoković, Petar",
year = "2014",
abstract = "The protocols for the preparation of dendritic cells (DCs) as cancer vaccines based on stimulation of Toll-like receptors (TLRs) are very promising. In this study we covalently attached 7-thia-8-oxoguanosine (7-TOG), a selective endosomal TLR7, to previously oxidized multi-walled carbon nanotubes (o-MWCNTs) (mass ratio 1:5.6, respectively), and tested their ability to activate human monocyte-derived (Mo)DCs. Light, confocal and transmission electron microscopy confirmed efficient phagocytosis of 7-TOG-MWCNTs by MoDCs and their efficient delivery to TLR7(+) endosomes. The biocompatibility studies showed that 7-TOG-MWCNTs, at concentrations lower than 100 mu g/ml, were not cytotoxic for MoDCs. 7-TOG-MV/CNTs (50 mu g/ml) up-regulated CD86 expression, allostimulatory activity, T helper (Th)1- and Th17-polarizing capability of MoDCs. The same concentration of soluble 7-TOG, alone or in combination with control o-MWCNTs, did not have such effects. It can be hypothesized that the efficacy of 7-TOG-MWCNTs in stimulating MoDCs was a consequence of increased intracellular concentration of 7-TOG after internalization of the nano-complexes, because similar Th-polarizing capability could be induced with 10-times higher concentrations of soluble 7-TOG. In conclusion, our results suggest that functionalized MWCNTs may be a promising system for the delivery of drugs to intracellular targets, in order to improve the immunogenic potential of DCs for therapeutic purposes.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Carbon",
title = "Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells",
pages = "287-273",
volume = "67",
doi = "10.1016/j.carbon.2013.09.090"
}

Čolić, M., Dzopalić, T., Tomić, S., Rajković, J., Rudolf, R., Vuković, G. D., Marinković, A.,& Uskoković, P.. (2014). Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells. in Carbon
Pergamon-Elsevier Science Ltd, Oxford., 67, 273-287.
https://doi.org/10.1016/j.carbon.2013.09.090

Čolić M, Dzopalić T, Tomić S, Rajković J, Rudolf R, Vuković GD, Marinković A, Uskoković P. Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells. in Carbon. 2014;67:273-287.
doi:10.1016/j.carbon.2013.09.090 .

Čolić, Miodrag, Dzopalić, Tanja, Tomić, Sergej, Rajković, Jelena, Rudolf, Rebeka, Vuković, Goran D., Marinković, Aleksandar, Uskoković, Petar, "Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells" in Carbon, 67 (2014):273-287,
https://doi.org/10.1016/j.carbon.2013.09.090 . .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Vuković, Goran D.
AU  - Steins, Ints
AU  - Palcevskis, Eriks
AU  - Uskoković, Petar
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2299
AB  - Composites based on HAP and oxidized multi-walled carbon nanotubes (o-MWCNT) and monophase HAP materials were processed by spark plasma sintering. Starting from stoichiometric nano-sized HAP powder, monophase bioceramics were obtained with a density close to the theoretical one and with an average grain size of several hundred nanometers to micron dimensions. It was shown that decreasing the sintering temperature resulted in a decrease of the grain size, which affected an increase in the fracture toughness and hardness. The fracture toughness of an HAP/ o-MWCNT bioceramic processed at 900°C for only 5 min was 30 % higher than that of monophase HAP materials obtained under the same conditions. The addition of MWCNT during SPS processing of HAP materials caused a decrease in the grain size to the nano-dimension, which was one of the reasons for the improved mechanical properties.
AB  - Kompoziti na bazi hidroksiapatita i oksidovanih višeslojnih karbonskih nanotuba i monofazni hidroksiapatitni materijali dobijeni su spark plazma sinterovanjem. Polazeći od stehiometrijskog nanočestičnog praha hidroksiapatita, dobijeni su monofazni hidroksiapatitni biokeramički materijali sa gustinama bliskim teorijskim vrednostima i prosečnom veličinom zrna od nekoliko stotina nanometara do mikronskih dimenzija. Pokazano je da se sa smanjenjem temperature sinterovanja smanjuje prosečna veličina zrna, što utiče na povećanje žilavosti i tvrdoće materijala. Žilavost kompozitnog biokeramičkog materijala dobijenog na 900°C za svega 5 minuta bila je 30 % veća od žilavosti monofazne hidroksiapatitne biokeramike dobijene pri identičnim parametrima procesiranja. Dodatak oksidovanih karbonskih nanotuba tokom procesiranja spark plazma sinterovanjem, prouzrokovao je smanjenje veličine zrna na nono dimenzije, što je jedan od razloga za poboljšanje mehaničkih svojstava dobijenih materijala.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes
EP  - 243
IS  - 2
SP  - 233
VL  - 45
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2299
ER  - 

@article{
author = "Veljović, Đorđe and Vuković, Goran D. and Steins, Ints and Palcevskis, Eriks and Uskoković, Petar and Petrović, Rada and Janaćković, Đorđe",
year = "2013",
abstract = "Composites based on HAP and oxidized multi-walled carbon nanotubes (o-MWCNT) and monophase HAP materials were processed by spark plasma sintering. Starting from stoichiometric nano-sized HAP powder, monophase bioceramics were obtained with a density close to the theoretical one and with an average grain size of several hundred nanometers to micron dimensions. It was shown that decreasing the sintering temperature resulted in a decrease of the grain size, which affected an increase in the fracture toughness and hardness. The fracture toughness of an HAP/ o-MWCNT bioceramic processed at 900°C for only 5 min was 30 % higher than that of monophase HAP materials obtained under the same conditions. The addition of MWCNT during SPS processing of HAP materials caused a decrease in the grain size to the nano-dimension, which was one of the reasons for the improved mechanical properties., Kompoziti na bazi hidroksiapatita i oksidovanih višeslojnih karbonskih nanotuba i monofazni hidroksiapatitni materijali dobijeni su spark plazma sinterovanjem. Polazeći od stehiometrijskog nanočestičnog praha hidroksiapatita, dobijeni su monofazni hidroksiapatitni biokeramički materijali sa gustinama bliskim teorijskim vrednostima i prosečnom veličinom zrna od nekoliko stotina nanometara do mikronskih dimenzija. Pokazano je da se sa smanjenjem temperature sinterovanja smanjuje prosečna veličina zrna, što utiče na povećanje žilavosti i tvrdoće materijala. Žilavost kompozitnog biokeramičkog materijala dobijenog na 900°C za svega 5 minuta bila je 30 % veća od žilavosti monofazne hidroksiapatitne biokeramike dobijene pri identičnim parametrima procesiranja. Dodatak oksidovanih karbonskih nanotuba tokom procesiranja spark plazma sinterovanjem, prouzrokovao je smanjenje veličine zrna na nono dimenzije, što je jedan od razloga za poboljšanje mehaničkih svojstava dobijenih materijala.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes",
pages = "243-233",
number = "2",
volume = "45",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2299"
}

Veljović, Đ., Vuković, G. D., Steins, I., Palcevskis, E., Uskoković, P., Petrović, R.,& Janaćković, Đ.. (2013). Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 45(2), 233-243.
https://hdl.handle.net/21.15107/rcub_technorep_2299

Veljović Đ, Vuković GD, Steins I, Palcevskis E, Uskoković P, Petrović R, Janaćković Đ. Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes. in Science of Sintering. 2013;45(2):233-243.
https://hdl.handle.net/21.15107/rcub_technorep_2299 .

Veljović, Đorđe, Vuković, Goran D., Steins, Ints, Palcevskis, Eriks, Uskoković, Petar, Petrović, Rada, Janaćković, Đorđe, "Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes" in Science of Sintering, 45, no. 2 (2013):233-243,
https://hdl.handle.net/21.15107/rcub_technorep_2299 .

TY  - JOUR
AU  - Đokić, Jelena D.
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Marinković, Aleksandar
AU  - Vuković, Goran D.
AU  - Aleksić, Radoslav
AU  - Uskoković, Petar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2077
AB  - Chitosan-based films have found increasing implementation in a variety of fields, among which are as drug delivery carriers, in the packaging industry and as water purification filters. Therefore, in order to achieve mechanical integrity of such films while preserving processability and biocompatibility, chitosan-based films are fabricated in the forms of blends with poly(ethylene oxide) (PEO). A nano-indentation study was undertaken in order to investigate the nanomechanical properties and surface morphology of chitosan films in blends with various content of PEO. The results of differential scanning calorimetry, water uptake and nano-indentation revealed that films with an 80/20 blend ratio of chitosan/PEO showed the optimal values of reduced modulus and hardness. It appears that the incorporation of the synthetic PEO in chitosan films could lower the manufacturing costs while preserving the mechanical integrity of the films.
AB  - Filmovi na bazi hitozana nalaze sve širu primenu u raznim oblastima između ostalog kao nosači lekova, u industriji ambalaže i kao filteri za prečišćavanje voda. Da bi se postigao mehanički integritet ovakvih filmova i zadržala procesabilnost i biokompatibilnost, filmovi na bazi hitozana pripremljeni su u formi blendi sa polietilen oksidom (PEO). Studija nanoindentacije urađena je u cilju proučavanja nanomehaničkih svojstava i površinske morfologije hitozanskih filmova u blendama sa različitim sadržajem PEO. Rezultati DSC-a, apsorpcije vode i nanoindentacije pokazali su da filmovi blendi sa odnosom 80/20 hitozana i PEO poseduju optimalne vrednosti redukovanog modula elastičnosti i tvrdoće. Pokazano je da dodavanje sintetičkog PEO u hitozanske filmove može smanjiti cenu proizvodnje i istovremeno zadržati mehanički integritet filmova.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films
T1  - Procesiranje i nanomehanička svojstva filma blendi hitozan/polietilen-oksid
EP  - 1733
IS  - 12
SP  - 1723
VL  - 77
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2077
ER  - 

@article{
author = "Đokić, Jelena D. and Kojović, Aleksandar and Stojanović, Dušica and Marinković, Aleksandar and Vuković, Goran D. and Aleksić, Radoslav and Uskoković, Petar",
year = "2012",
abstract = "Chitosan-based films have found increasing implementation in a variety of fields, among which are as drug delivery carriers, in the packaging industry and as water purification filters. Therefore, in order to achieve mechanical integrity of such films while preserving processability and biocompatibility, chitosan-based films are fabricated in the forms of blends with poly(ethylene oxide) (PEO). A nano-indentation study was undertaken in order to investigate the nanomechanical properties and surface morphology of chitosan films in blends with various content of PEO. The results of differential scanning calorimetry, water uptake and nano-indentation revealed that films with an 80/20 blend ratio of chitosan/PEO showed the optimal values of reduced modulus and hardness. It appears that the incorporation of the synthetic PEO in chitosan films could lower the manufacturing costs while preserving the mechanical integrity of the films., Filmovi na bazi hitozana nalaze sve širu primenu u raznim oblastima između ostalog kao nosači lekova, u industriji ambalaže i kao filteri za prečišćavanje voda. Da bi se postigao mehanički integritet ovakvih filmova i zadržala procesabilnost i biokompatibilnost, filmovi na bazi hitozana pripremljeni su u formi blendi sa polietilen oksidom (PEO). Studija nanoindentacije urađena je u cilju proučavanja nanomehaničkih svojstava i površinske morfologije hitozanskih filmova u blendama sa različitim sadržajem PEO. Rezultati DSC-a, apsorpcije vode i nanoindentacije pokazali su da filmovi blendi sa odnosom 80/20 hitozana i PEO poseduju optimalne vrednosti redukovanog modula elastičnosti i tvrdoće. Pokazano je da dodavanje sintetičkog PEO u hitozanske filmove može smanjiti cenu proizvodnje i istovremeno zadržati mehanički integritet filmova.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films, Procesiranje i nanomehanička svojstva filma blendi hitozan/polietilen-oksid",
pages = "1733-1723",
number = "12",
volume = "77",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2077"
}

Đokić, J. D., Kojović, A., Stojanović, D., Marinković, A., Vuković, G. D., Aleksić, R.,& Uskoković, P.. (2012). Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 77(12), 1723-1733.
https://hdl.handle.net/21.15107/rcub_technorep_2077

Đokić JD, Kojović A, Stojanović D, Marinković A, Vuković GD, Aleksić R, Uskoković P. Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films. in Journal of the Serbian Chemical Society. 2012;77(12):1723-1733.
https://hdl.handle.net/21.15107/rcub_technorep_2077 .

Đokić, Jelena D., Kojović, Aleksandar, Stojanović, Dušica, Marinković, Aleksandar, Vuković, Goran D., Aleksić, Radoslav, Uskoković, Petar, "Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films" in Journal of the Serbian Chemical Society, 77, no. 12 (2012):1723-1733,
https://hdl.handle.net/21.15107/rcub_technorep_2077 .

TY  - JOUR
AU  - Veličković, Zlate
AU  - Vuković, Goran D.
AU  - Marinković, Aleksandar
AU  - Moldovan, Maria-Simona
AU  - Perić-Grujić, Aleksandra
AU  - Uskoković, Petar
AU  - Ristić, Mirjana
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2202
AB  - New criteria in assessing the quality of drinking water reduced the maximum permissible concentration of arsenic from 50 mu g L-1 to 10 mu g L-1 and set a requirement for the development of new technologies for arsenic removal. In this paper, ethylenediamine functionalized multiwall carbon nanotubes (e-MWCNT) were loaded with iron(III) oxide in the goethite form, by precipitation of adsorbed Fe3+ and oxidized Fe2+ using base, in that way e-MWCNT/Fe3+ and e-MWCNT/Fe2+ adsorbents, respectively, were obtained. The influence of pH on the As(V) and As(III) removal from drinking water was studied in a batch system, of pH range 3-10 and initial arsenic concentration 0.05-4 mg L-1. Time dependent As(V) adsorption and adsorption data can be described by pseudo-second-order kinetic model and by Freundlich isotherm, applying linear and non-linear fitting methods. The maximum adsorption capacities obtained from Langmuir model for As(V) on e-MWCNT/Fe2+ and e-MWCNT/Fe3+ were 23.47 and 13.74 mg g(-1) at 25 degrees C. respectively. Thermodynamic parameters showed that the adsorption of As(V) was spontaneous and endothermic for both e-MWCNT/Fe2+ and e-MWCNT/Fe3+. Influences of the pH, iron(III) oxide loading and interfering ions were modeled by MINTEQ program, and good agreement between experimental and modeling data was obtained.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes
EP  - 181
SP  - 174
VL  - 181
DO  - 10.1016/j.cej.2011.11.052
ER  - 

@article{
author = "Veličković, Zlate and Vuković, Goran D. and Marinković, Aleksandar and Moldovan, Maria-Simona and Perić-Grujić, Aleksandra and Uskoković, Petar and Ristić, Mirjana",
year = "2012",
abstract = "New criteria in assessing the quality of drinking water reduced the maximum permissible concentration of arsenic from 50 mu g L-1 to 10 mu g L-1 and set a requirement for the development of new technologies for arsenic removal. In this paper, ethylenediamine functionalized multiwall carbon nanotubes (e-MWCNT) were loaded with iron(III) oxide in the goethite form, by precipitation of adsorbed Fe3+ and oxidized Fe2+ using base, in that way e-MWCNT/Fe3+ and e-MWCNT/Fe2+ adsorbents, respectively, were obtained. The influence of pH on the As(V) and As(III) removal from drinking water was studied in a batch system, of pH range 3-10 and initial arsenic concentration 0.05-4 mg L-1. Time dependent As(V) adsorption and adsorption data can be described by pseudo-second-order kinetic model and by Freundlich isotherm, applying linear and non-linear fitting methods. The maximum adsorption capacities obtained from Langmuir model for As(V) on e-MWCNT/Fe2+ and e-MWCNT/Fe3+ were 23.47 and 13.74 mg g(-1) at 25 degrees C. respectively. Thermodynamic parameters showed that the adsorption of As(V) was spontaneous and endothermic for both e-MWCNT/Fe2+ and e-MWCNT/Fe3+. Influences of the pH, iron(III) oxide loading and interfering ions were modeled by MINTEQ program, and good agreement between experimental and modeling data was obtained.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes",
pages = "181-174",
volume = "181",
doi = "10.1016/j.cej.2011.11.052"
}

Veličković, Z., Vuković, G. D., Marinković, A., Moldovan, M., Perić-Grujić, A., Uskoković, P.,& Ristić, M.. (2012). Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 181, 174-181.
https://doi.org/10.1016/j.cej.2011.11.052

Veličković Z, Vuković GD, Marinković A, Moldovan M, Perić-Grujić A, Uskoković P, Ristić M. Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes. in Chemical Engineering Journal. 2012;181:174-181.
doi:10.1016/j.cej.2011.11.052 .

Veličković, Zlate, Vuković, Goran D., Marinković, Aleksandar, Moldovan, Maria-Simona, Perić-Grujić, Aleksandra, Uskoković, Petar, Ristić, Mirjana, "Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes" in Chemical Engineering Journal, 181 (2012):174-181,
https://doi.org/10.1016/j.cej.2011.11.052 . .

TY  - JOUR
AU  - Vuković, Goran D.
AU  - Marinković, Aleksandar
AU  - Škapin, Srečo Davor
AU  - Ristić, Mirjana
AU  - Aleksić, Radoslav
AU  - Perić-Grujić, Aleksandra
AU  - Uskoković, Petar
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1856
AB  - Pristine, oxidized, ethylenediamine, diethylenetriamine and triethylenetetramine modified multi-walled carbon nanotubes (raw-MWCNT, o-MWCNT, e-MWCNT, d-MWCNT and t-MWCNT, respectively) were employed as adsorbents in order to study individual and competitive adsorption characteristics of Pb2+ and Cd2+ ions. In batch tests, the influence of functionalization, pH, contact time, initial metal ion concentration and temperature, on the ion adsorption on MWCNTs was studied. Adsorption of Pb2+ and Cd2+ on MWCNTs strongly depends on pH. Time dependent Pb2+ adsorption and adsorption data can be described by pseudo-second-order kinetic model and by Langmuir isotherm, respectively. The maximum adsorption capacities of Pb2+ and Cd2+ on d-MWCNT were 58.26 and 31.45 mg g(-1) at 45 degrees C. respectively. The competitive adsorption studies showed that the metal order affinity with respect to d-MWCNT and e-MWCNT is Pb2+  gt  Cd2+. Thermodynamic parameters showed that the adsorption of Pb2+ on appropriate nanotubes was spontaneous and endothermic. According to desorption studies, regenerated MWCNT can be reused over five times with minimal loss of adsorption capacity. Comparison of obtained results with capacities and affinities of other adsorbents indicates suitability of amino-functionalized MWCNT application for removal of Pb2+ and Cd2+ from aqueous solution.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - Removal of lead from water by amino modified multi-walled carbon nanotubes
EP  - 865
IS  - 3
SP  - 855
VL  - 173
DO  - 10.1016/j.cej.2011.08.036
ER  - 

@article{
author = "Vuković, Goran D. and Marinković, Aleksandar and Škapin, Srečo Davor and Ristić, Mirjana and Aleksić, Radoslav and Perić-Grujić, Aleksandra and Uskoković, Petar",
year = "2011",
abstract = "Pristine, oxidized, ethylenediamine, diethylenetriamine and triethylenetetramine modified multi-walled carbon nanotubes (raw-MWCNT, o-MWCNT, e-MWCNT, d-MWCNT and t-MWCNT, respectively) were employed as adsorbents in order to study individual and competitive adsorption characteristics of Pb2+ and Cd2+ ions. In batch tests, the influence of functionalization, pH, contact time, initial metal ion concentration and temperature, on the ion adsorption on MWCNTs was studied. Adsorption of Pb2+ and Cd2+ on MWCNTs strongly depends on pH. Time dependent Pb2+ adsorption and adsorption data can be described by pseudo-second-order kinetic model and by Langmuir isotherm, respectively. The maximum adsorption capacities of Pb2+ and Cd2+ on d-MWCNT were 58.26 and 31.45 mg g(-1) at 45 degrees C. respectively. The competitive adsorption studies showed that the metal order affinity with respect to d-MWCNT and e-MWCNT is Pb2+  gt  Cd2+. Thermodynamic parameters showed that the adsorption of Pb2+ on appropriate nanotubes was spontaneous and endothermic. According to desorption studies, regenerated MWCNT can be reused over five times with minimal loss of adsorption capacity. Comparison of obtained results with capacities and affinities of other adsorbents indicates suitability of amino-functionalized MWCNT application for removal of Pb2+ and Cd2+ from aqueous solution.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "Removal of lead from water by amino modified multi-walled carbon nanotubes",
pages = "865-855",
number = "3",
volume = "173",
doi = "10.1016/j.cej.2011.08.036"
}

Vuković, G. D., Marinković, A., Škapin, S. D., Ristić, M., Aleksić, R., Perić-Grujić, A.,& Uskoković, P.. (2011). Removal of lead from water by amino modified multi-walled carbon nanotubes. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 173(3), 855-865.
https://doi.org/10.1016/j.cej.2011.08.036

Vuković GD, Marinković A, Škapin SD, Ristić M, Aleksić R, Perić-Grujić A, Uskoković P. Removal of lead from water by amino modified multi-walled carbon nanotubes. in Chemical Engineering Journal. 2011;173(3):855-865.
doi:10.1016/j.cej.2011.08.036 .

Vuković, Goran D., Marinković, Aleksandar, Škapin, Srečo Davor, Ristić, Mirjana, Aleksić, Radoslav, Perić-Grujić, Aleksandra, Uskoković, Petar, "Removal of lead from water by amino modified multi-walled carbon nanotubes" in Chemical Engineering Journal, 173, no. 3 (2011):855-865,
https://doi.org/10.1016/j.cej.2011.08.036 . .

TY  - JOUR
AU  - Vuković, Goran D.
AU  - Obradović, Maja
AU  - Marinković, Aleksandar
AU  - Rogan, Jelena
AU  - Uskoković, Petar
AU  - Radmilović, Velimir R.
AU  - Gojković, Snežana Lj.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1868
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
EP  - 664
IS  - 1-2
SP  - 657
VL  - 130
DO  - 10.1016/j.matchemphys.2011.07.046
ER  - 

@article{
author = "Vuković, Goran D. and Obradović, Maja and Marinković, Aleksandar and Rogan, Jelena and Uskoković, Petar 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",
pages = "664-657",
number = "1-2",
volume = "130",
doi = "10.1016/j.matchemphys.2011.07.046"
}

Vuković, G. D., Obradović, M., Marinković, A., Rogan, J., Uskoković, P., 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

Vuković GD, Obradović M, Marinković A, Rogan J, Uskoković P, 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 .

Vuković, Goran D., Obradović, Maja, Marinković, Aleksandar, Rogan, Jelena, Uskoković, Petar, 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  - Milosavljević, Milutin M.
AU  - Vuković, Goran D.
AU  - Marinković, Aleksandar
AU  - Aleksić, Radoslav
AU  - Uskoković, Petar
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1901
AB  - Twelve N-(3- and 4-substituted phenyl)-O-isobutyl thionocarbamates, eight of which are novel, were synthesized from O-isobutyl xanthate and 3- and 4-substituted anilines in the presence of a nano-platinum aminophenyl modified multi-walled carbon nanotube catalyst. The nano-Pt catalyst was prepared on a carbon nanotube support modified by diazotization, nitro group reduction, and subsequent microwave-assisted nano-Pt precipitation. The catalyst was characterized by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis, thermogravimetric analysis, and transmission electron microscopy. The nano-platinum/modified carbon nanotube catalyst was compared with a commercial Pt/active carbon catalyst in terms of product purity and yield. The results obtained by the use of the catalysts were additionally compared with those obtained by reaction of sodium isobutyl xanthogenacetate and 3- and 4-substituted anilines. Full structure characterization of the synthesized N-(substituted phenyl)-O-isobutyl thionocarbamates was achieved using FT-IR, H-1 and C-13 NMR, and mass spectrometric methods, and their purity was proved by elemental analysis and gas chromatography. The new catalytic method offers advantages over the commercial method, such as higher yields and no product purification is required, thus conforming to the principles of ecologically friendly syntheses.
PB  - Springer Wien, Wien
T2  - Monatshefte Fur Chemie
T1  - Synthesis of N-(3-and 4-substituted phenyl)-O-isobutyl thionocarbamates from O-isobutyl xanthate and amines using a nano-platinum multi-walled carbon nanotube catalyst
EP  - 1053
IS  - 10
SP  - 1045
VL  - 142
DO  - 10.1007/s00706-011-0568-5
ER  - 

@article{
author = "Milosavljević, Milutin M. and Vuković, Goran D. and Marinković, Aleksandar and Aleksić, Radoslav and Uskoković, Petar",
year = "2011",
abstract = "Twelve N-(3- and 4-substituted phenyl)-O-isobutyl thionocarbamates, eight of which are novel, were synthesized from O-isobutyl xanthate and 3- and 4-substituted anilines in the presence of a nano-platinum aminophenyl modified multi-walled carbon nanotube catalyst. The nano-Pt catalyst was prepared on a carbon nanotube support modified by diazotization, nitro group reduction, and subsequent microwave-assisted nano-Pt precipitation. The catalyst was characterized by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis, thermogravimetric analysis, and transmission electron microscopy. The nano-platinum/modified carbon nanotube catalyst was compared with a commercial Pt/active carbon catalyst in terms of product purity and yield. The results obtained by the use of the catalysts were additionally compared with those obtained by reaction of sodium isobutyl xanthogenacetate and 3- and 4-substituted anilines. Full structure characterization of the synthesized N-(substituted phenyl)-O-isobutyl thionocarbamates was achieved using FT-IR, H-1 and C-13 NMR, and mass spectrometric methods, and their purity was proved by elemental analysis and gas chromatography. The new catalytic method offers advantages over the commercial method, such as higher yields and no product purification is required, thus conforming to the principles of ecologically friendly syntheses.",
publisher = "Springer Wien, Wien",
journal = "Monatshefte Fur Chemie",
title = "Synthesis of N-(3-and 4-substituted phenyl)-O-isobutyl thionocarbamates from O-isobutyl xanthate and amines using a nano-platinum multi-walled carbon nanotube catalyst",
pages = "1053-1045",
number = "10",
volume = "142",
doi = "10.1007/s00706-011-0568-5"
}

Milosavljević, M. M., Vuković, G. D., Marinković, A., Aleksić, R.,& Uskoković, P.. (2011). Synthesis of N-(3-and 4-substituted phenyl)-O-isobutyl thionocarbamates from O-isobutyl xanthate and amines using a nano-platinum multi-walled carbon nanotube catalyst. in Monatshefte Fur Chemie
Springer Wien, Wien., 142(10), 1045-1053.
https://doi.org/10.1007/s00706-011-0568-5

Milosavljević MM, Vuković GD, Marinković A, Aleksić R, Uskoković P. Synthesis of N-(3-and 4-substituted phenyl)-O-isobutyl thionocarbamates from O-isobutyl xanthate and amines using a nano-platinum multi-walled carbon nanotube catalyst. in Monatshefte Fur Chemie. 2011;142(10):1045-1053.
doi:10.1007/s00706-011-0568-5 .

Milosavljević, Milutin M., Vuković, Goran D., Marinković, Aleksandar, Aleksić, Radoslav, Uskoković, Petar, "Synthesis of N-(3-and 4-substituted phenyl)-O-isobutyl thionocarbamates from O-isobutyl xanthate and amines using a nano-platinum multi-walled carbon nanotube catalyst" in Monatshefte Fur Chemie, 142, no. 10 (2011):1045-1053,
https://doi.org/10.1007/s00706-011-0568-5 . .

TY  - JOUR
AU  - Vuković, Goran D.
AU  - Marinković, Aleksandar
AU  - Čolić, Miodrag
AU  - Ristić, Mirjana
AU  - Aleksić, Radoslav
AU  - Perić-Grujić, Aleksandra
AU  - Uskoković, Petar
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1714
AB  - Surface functionalization of multi-walled carbon nanotubes (MWCNTs) by ethylenediamine, via chemical modification of carboxyl groups, using O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, was performed. The resulting materials were characterized by different techniques, such as FTIR, TGA and elemental analysis. Biocompatibility studies showed that the functionalized MWCNTs, at concentrations between 1 and 50 mu g mL(-1), were not cytotoxic for the fibroblast L929 cell line. In batch tests, the influences of solution pH, contact time, initial metal ion concentration and temperature on the sorption of Cd2+ ions onto raw-MWCNTs (raw-MWCNT), oxidized MWCNTs (o-MWCNT) and ethylenediamine-functionalized MWCNTs (e-MWCNT) were studied. The adsorption of Cd2+ ions by o-MWCNT and e-MWCNT was strongly pH dependent. The time dependent Cd2+ sorption onto raw-MWCNT, o-MWCNT and e-MWCNT can be described by a pseudo-second-order kinetic model. The Langmuir isotherm model agrees well with the equilibrium experimental data. The maximum capacity was obtained for e-MWCNT, 25.7 mgg(-1), at 45 degrees C. The thermodynamic parameters were also deduced for the adsorption of Cd2+ ions on raw-MWCNT, o-MWCNT and e-MWCNT and the results showed that the adsorption was spontaneous and endothermic.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - Removal of cadmium from aqueous solutions by oxidized and ethylenediamine-functionalized multi-walled carbon nanotubes
EP  - 248
IS  - 1
SP  - 238
VL  - 157
DO  - 10.1016/j.cej.2009.11.026
ER  - 

@article{
author = "Vuković, Goran D. and Marinković, Aleksandar and Čolić, Miodrag and Ristić, Mirjana and Aleksić, Radoslav and Perić-Grujić, Aleksandra and Uskoković, Petar",
year = "2010",
abstract = "Surface functionalization of multi-walled carbon nanotubes (MWCNTs) by ethylenediamine, via chemical modification of carboxyl groups, using O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate, was performed. The resulting materials were characterized by different techniques, such as FTIR, TGA and elemental analysis. Biocompatibility studies showed that the functionalized MWCNTs, at concentrations between 1 and 50 mu g mL(-1), were not cytotoxic for the fibroblast L929 cell line. In batch tests, the influences of solution pH, contact time, initial metal ion concentration and temperature on the sorption of Cd2+ ions onto raw-MWCNTs (raw-MWCNT), oxidized MWCNTs (o-MWCNT) and ethylenediamine-functionalized MWCNTs (e-MWCNT) were studied. The adsorption of Cd2+ ions by o-MWCNT and e-MWCNT was strongly pH dependent. The time dependent Cd2+ sorption onto raw-MWCNT, o-MWCNT and e-MWCNT can be described by a pseudo-second-order kinetic model. The Langmuir isotherm model agrees well with the equilibrium experimental data. The maximum capacity was obtained for e-MWCNT, 25.7 mgg(-1), at 45 degrees C. The thermodynamic parameters were also deduced for the adsorption of Cd2+ ions on raw-MWCNT, o-MWCNT and e-MWCNT and the results showed that the adsorption was spontaneous and endothermic.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "Removal of cadmium from aqueous solutions by oxidized and ethylenediamine-functionalized multi-walled carbon nanotubes",
pages = "248-238",
number = "1",
volume = "157",
doi = "10.1016/j.cej.2009.11.026"
}

Vuković, G. D., Marinković, A., Čolić, M., Ristić, M., Aleksić, R., Perić-Grujić, A.,& Uskoković, P.. (2010). Removal of cadmium from aqueous solutions by oxidized and ethylenediamine-functionalized multi-walled carbon nanotubes. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 157(1), 238-248.
https://doi.org/10.1016/j.cej.2009.11.026

Vuković GD, Marinković A, Čolić M, Ristić M, Aleksić R, Perić-Grujić A, Uskoković P. Removal of cadmium from aqueous solutions by oxidized and ethylenediamine-functionalized multi-walled carbon nanotubes. in Chemical Engineering Journal. 2010;157(1):238-248.
doi:10.1016/j.cej.2009.11.026 .

Vuković, Goran D., Marinković, Aleksandar, Čolić, Miodrag, Ristić, Mirjana, Aleksić, Radoslav, Perić-Grujić, Aleksandra, Uskoković, Petar, "Removal of cadmium from aqueous solutions by oxidized and ethylenediamine-functionalized multi-walled carbon nanotubes" in Chemical Engineering Journal, 157, no. 1 (2010):238-248,
https://doi.org/10.1016/j.cej.2009.11.026 . .

TY  - JOUR
AU  - Vuković, Goran D.
AU  - Tomić, Sergej
AU  - Marinković, Aleksandar
AU  - Radmilović, Velimir R.
AU  - Uskoković, Petar
AU  - Čolić, Miodrag
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1648
AB  - Dapsone is an anti-microbial and anti-inflammatory drug. Water-dispersible dapsone-modified multi-wall carbon nanotubes (dap-MWCNTs) were prepared by chemical modification of the carboxyl groups introduced on the surface of the nanotubes using O-(7-aza-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate (N-HATU) and N,N-diisopropylethylamine (DIEA). The modification was confirmed by Fourier-transform infrared spectroscopy, transmission election microscopy and thermogravimetric analysis. The biological effect of dap-MWCNTs was tested using rat peritoneal macrophages (PMempty set). By confocal laser microscopy and flow cytometry, it was shown that the dap-MWCNTs were rapidly ingested by PMempty set as were the control, oxidized o-MWCNTs. Neither dap-MWCNTs at lower concentrations (up to 50 mu g/ml), nor o-MWCNTs, at equivalent concentrations, respectively affected the viability of PMempty set, while higher concentrations triggered apoptosis. Apoptosis of PMempty set induced by the control, o-MWCNTs, was higher than that induced by dap-MWCNTs and it correlated with the induction of oxidative stress. In contrast, dap-MWCNTs did not trigger oxidative stress but caused apoptosis of PMempty set predominantly after prolonged cultivation (3 days). Although equivalent concentrations of soluble dapsone induced oxidative stress, they were anti-apoptotic. Cumulatively, the obtained results show the complexity of dap-MWCNT/PMempty set interactions and suggest that this complex could be investigated for the treatment of dapsone-sensitive intracellular microorganisms or inflammatory diseases responding to dapsone therapy.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Carbon
T1  - The response of peritoneal macrophages to dapsone covalently attached on the surface of carbon nanotubes
EP  - 3078
IS  - 11
SP  - 3066
VL  - 48
DO  - 10.1016/j.carbon.2010.04.043
ER  - 

@article{
author = "Vuković, Goran D. and Tomić, Sergej and Marinković, Aleksandar and Radmilović, Velimir R. and Uskoković, Petar and Čolić, Miodrag",
year = "2010",
abstract = "Dapsone is an anti-microbial and anti-inflammatory drug. Water-dispersible dapsone-modified multi-wall carbon nanotubes (dap-MWCNTs) were prepared by chemical modification of the carboxyl groups introduced on the surface of the nanotubes using O-(7-aza-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate (N-HATU) and N,N-diisopropylethylamine (DIEA). The modification was confirmed by Fourier-transform infrared spectroscopy, transmission election microscopy and thermogravimetric analysis. The biological effect of dap-MWCNTs was tested using rat peritoneal macrophages (PMempty set). By confocal laser microscopy and flow cytometry, it was shown that the dap-MWCNTs were rapidly ingested by PMempty set as were the control, oxidized o-MWCNTs. Neither dap-MWCNTs at lower concentrations (up to 50 mu g/ml), nor o-MWCNTs, at equivalent concentrations, respectively affected the viability of PMempty set, while higher concentrations triggered apoptosis. Apoptosis of PMempty set induced by the control, o-MWCNTs, was higher than that induced by dap-MWCNTs and it correlated with the induction of oxidative stress. In contrast, dap-MWCNTs did not trigger oxidative stress but caused apoptosis of PMempty set predominantly after prolonged cultivation (3 days). Although equivalent concentrations of soluble dapsone induced oxidative stress, they were anti-apoptotic. Cumulatively, the obtained results show the complexity of dap-MWCNT/PMempty set interactions and suggest that this complex could be investigated for the treatment of dapsone-sensitive intracellular microorganisms or inflammatory diseases responding to dapsone therapy.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Carbon",
title = "The response of peritoneal macrophages to dapsone covalently attached on the surface of carbon nanotubes",
pages = "3078-3066",
number = "11",
volume = "48",
doi = "10.1016/j.carbon.2010.04.043"
}

Vuković, G. D., Tomić, S., Marinković, A., Radmilović, V. R., Uskoković, P.,& Čolić, M.. (2010). The response of peritoneal macrophages to dapsone covalently attached on the surface of carbon nanotubes. in Carbon
Pergamon-Elsevier Science Ltd, Oxford., 48(11), 3066-3078.
https://doi.org/10.1016/j.carbon.2010.04.043

Vuković GD, Tomić S, Marinković A, Radmilović VR, Uskoković P, Čolić M. The response of peritoneal macrophages to dapsone covalently attached on the surface of carbon nanotubes. in Carbon. 2010;48(11):3066-3078.
doi:10.1016/j.carbon.2010.04.043 .

Vuković, Goran D., Tomić, Sergej, Marinković, Aleksandar, Radmilović, Velimir R., Uskoković, Petar, Čolić, Miodrag, "The response of peritoneal macrophages to dapsone covalently attached on the surface of carbon nanotubes" in Carbon, 48, no. 11 (2010):3066-3078,
https://doi.org/10.1016/j.carbon.2010.04.043 . .

TY  - JOUR
AU  - Obradović, Maja
AU  - Vuković, Goran D.
AU  - Stevanović, Sanja
AU  - Panić, Vladimir
AU  - Uskoković, Petar
AU  - Kowal, Andrzej
AU  - Gojković, Snežana Lj.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1420
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 Science Sa, Lausanne
T2  - Journal of Electroanalytical Chemistry
T1  - A comparative study of the electrochemical properties of carbon nanotubes and carbon black
EP  - 30
IS  - 1
SP  - 22
VL  - 634
DO  - 10.1016/j.jelechem.2009.07.001
ER  - 

@article{
author = "Obradović, Maja and Vuković, Goran D. and Stevanović, Sanja and Panić, Vladimir and Uskoković, Petar 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 Science Sa, Lausanne",
journal = "Journal of Electroanalytical Chemistry",
title = "A comparative study of the electrochemical properties of carbon nanotubes and carbon black",
pages = "30-22",
number = "1",
volume = "634",
doi = "10.1016/j.jelechem.2009.07.001"
}

Obradović, M., Vuković, G. D., Stevanović, S., Panić, V., Uskoković, P., 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 Science Sa, Lausanne., 634(1), 22-30.
https://doi.org/10.1016/j.jelechem.2009.07.001

Obradović M, Vuković GD, Stevanović S, Panić V, Uskoković P, 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, Goran D., Stevanović, Sanja, Panić, Vladimir, Uskoković, Petar, 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, Goran D.
AU  - Marinković, Aleksandar
AU  - Obradović, Maja
AU  - Radmilović, V.
AU  - Čolić, Miodrag
AU  - Aleksić, Radoslav
AU  - Uskoković, Petar
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1512
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 mu g ml(-1), were not cytotoxic for the fibroblast L929 cell line. However, the concentrations of MWCNTs higher of 10 mu g ml(-1) reduced cell growth and this effect correlated positively with the degree of their uptake by L929 cells.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Surface Science
T1  - Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes
EP  - 8075
IS  - 18
SP  - 8067
VL  - 255
DO  - 10.1016/j.apsusc.2009.05.016
ER  - 

@article{
author = "Vuković, Goran D. and Marinković, Aleksandar and Obradović, Maja and Radmilović, V. and Čolić, Miodrag and Aleksić, Radoslav and Uskoković, Petar",
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 mu g ml(-1), were not cytotoxic for the fibroblast L929 cell line. However, the concentrations of MWCNTs higher of 10 mu g ml(-1) reduced cell growth and this effect correlated positively with the degree of their uptake by L929 cells.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Surface Science",
title = "Synthesis, characterization and cytotoxicity of surface amino-functionalized water-dispersible multi-walled carbon nanotubes",
pages = "8075-8067",
number = "18",
volume = "255",
doi = "10.1016/j.apsusc.2009.05.016"
}

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

Vuković GD, Marinković A, Obradović M, Radmilović V, Čolić M, Aleksić R, Uskoković P. 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, Goran D., Marinković, Aleksandar, Obradović, Maja, Radmilović, V., Čolić, Miodrag, Aleksić, Radoslav, Uskoković, Petar, "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 . .

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 . .