TY  - JOUR
AU  - Popović, Aleksandar R.
AU  - Anđelković, Boban D.
AU  - Đorđević, Dragana S.
AU  - Sakan, Sanja M.
AU  - Vujisić, Ljubodrag V.
AU  - Veličković, Sava
AU  - Relić, Dubravka
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5377
AB  - In order to further define the potential use of FTIR-ATR spectroscopy, as a non-destructive and reliable technique, for the analysis of the characteristics of post stamps, certified originals of the Principality of Serbia stamps (“Prince Michael issues”) issued in 1866 and 1868 as well as their forgeries were ana­lyzed. Spectra enabling the comparison of the paper, dye and glue of stamps of so-called “Vienna issues”, having denominations of 10 (orange-yellow), 20 (pink) and 40 para (blue) and “Belgrade issues” (1 para-green and 2 para-reddish brown), as well as 24 expert-certified forgeries, were taken. It was shown that the applied technology was, in most of the cases, a fast and suitable technique for establishing clear differences between the spectral characteristics of the paper and dye used for the original stamps, and forgeries that were most probably made decades after the printing of the genuine stamps. The differences between print­ings of the same issues of the genuine stamps were also elaborated. It is pro­posed, for the first time in philatelic history, the possibility that “Vienna issues” stamps may have been printed on two different papers, and, having in mind the technology of printing in the 19th century, potentially, not even at the same time or in the same printing house.
T2  - Journal of the Serbian Chemical Society
T1  - To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries
EP  - 40
IS  - 1
SP  - 27
VL  - 87
DO  - 10.2298/JSC210901090P
ER  - 

@article{
author = "Popović, Aleksandar R. and Anđelković, Boban D. and Đorđević, Dragana S. and Sakan, Sanja M. and Vujisić, Ljubodrag V. and Veličković, Sava and Relić, Dubravka",
year = "2022",
abstract = "In order to further define the potential use of FTIR-ATR spectroscopy, as a non-destructive and reliable technique, for the analysis of the characteristics of post stamps, certified originals of the Principality of Serbia stamps (“Prince Michael issues”) issued in 1866 and 1868 as well as their forgeries were ana­lyzed. Spectra enabling the comparison of the paper, dye and glue of stamps of so-called “Vienna issues”, having denominations of 10 (orange-yellow), 20 (pink) and 40 para (blue) and “Belgrade issues” (1 para-green and 2 para-reddish brown), as well as 24 expert-certified forgeries, were taken. It was shown that the applied technology was, in most of the cases, a fast and suitable technique for establishing clear differences between the spectral characteristics of the paper and dye used for the original stamps, and forgeries that were most probably made decades after the printing of the genuine stamps. The differences between print­ings of the same issues of the genuine stamps were also elaborated. It is pro­posed, for the first time in philatelic history, the possibility that “Vienna issues” stamps may have been printed on two different papers, and, having in mind the technology of printing in the 19th century, potentially, not even at the same time or in the same printing house.",
journal = "Journal of the Serbian Chemical Society",
title = "To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries",
pages = "40-27",
number = "1",
volume = "87",
doi = "10.2298/JSC210901090P"
}

Popović, A. R., Anđelković, B. D., Đorđević, D. S., Sakan, S. M., Vujisić, L. V., Veličković, S.,& Relić, D.. (2022). To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries. in Journal of the Serbian Chemical Society, 87(1), 27-40.
https://doi.org/10.2298/JSC210901090P

Popović AR, Anđelković BD, Đorđević DS, Sakan SM, Vujisić LV, Veličković S, Relić D. To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries. in Journal of the Serbian Chemical Society. 2022;87(1):27-40.
doi:10.2298/JSC210901090P .

Popović, Aleksandar R., Anđelković, Boban D., Đorđević, Dragana S., Sakan, Sanja M., Vujisić, Ljubodrag V., Veličković, Sava, Relić, Dubravka, "To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries" in Journal of the Serbian Chemical Society, 87, no. 1 (2022):27-40,
https://doi.org/10.2298/JSC210901090P . .

TY  - JOUR
AU  - Jevremović, Nenad
AU  - Veličković, Sava
AU  - Kalagasidis Krušić, Melina
AU  - Panić, Vesna
AU  - Volkov-Husović, Tatjana
AU  - Jančić-Heinemann, Radmila
AU  - Popović, Ivanka
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3902
AB  - The aim of this paper is to present image analysis as a useful technique for fast, reliable and non-destructive detection of dimensional and structural changes in polymers. The possibility of applying image analysis was demonstrated in the case of solvent-induced crystallization of poly(ethylene terephthalate) (PET) containers filled with commonly used organic solvents: chlorobenzene, isophorone, xylene, Espesol, Shellsol A 100, Solvesso 150, propylene glycol, glycerin and water and subjected to the storage stability test at 54 degrees C for 14 days (CIPAC 1-MT 46.1.3). In addition, the obtained results were analyzed using one-step analysis of variance (ANOVA) combined with the Duncan's statistical test (p lt 0.05). According to the achieved results, three main impacts of the presented paper could be distinguished: 1) dimensional and transparency changes could be precisely followed by image analysis in both following cases: for small changes in water, as well as for significant ones in chlorobenzene; 2) a correlation between the changes in the degree of crystallinity and transparency could be obtained without the continuous material testing by DSC; 3) image analysis is potentially applicable for assessment of other crystalline polymers.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Image analysis as a useful tool for fast detection of dimensional and structural changes of poly(ethylene terephthalate) containers
EP  - 361
IS  - 6
SP  - 351
VL  - 72
DO  - 10.2298/HEMIND180516027J
ER  - 

@article{
author = "Jevremović, Nenad and Veličković, Sava and Kalagasidis Krušić, Melina and Panić, Vesna and Volkov-Husović, Tatjana and Jančić-Heinemann, Radmila and Popović, Ivanka",
year = "2018",
abstract = "The aim of this paper is to present image analysis as a useful technique for fast, reliable and non-destructive detection of dimensional and structural changes in polymers. The possibility of applying image analysis was demonstrated in the case of solvent-induced crystallization of poly(ethylene terephthalate) (PET) containers filled with commonly used organic solvents: chlorobenzene, isophorone, xylene, Espesol, Shellsol A 100, Solvesso 150, propylene glycol, glycerin and water and subjected to the storage stability test at 54 degrees C for 14 days (CIPAC 1-MT 46.1.3). In addition, the obtained results were analyzed using one-step analysis of variance (ANOVA) combined with the Duncan's statistical test (p lt 0.05). According to the achieved results, three main impacts of the presented paper could be distinguished: 1) dimensional and transparency changes could be precisely followed by image analysis in both following cases: for small changes in water, as well as for significant ones in chlorobenzene; 2) a correlation between the changes in the degree of crystallinity and transparency could be obtained without the continuous material testing by DSC; 3) image analysis is potentially applicable for assessment of other crystalline polymers.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Image analysis as a useful tool for fast detection of dimensional and structural changes of poly(ethylene terephthalate) containers",
pages = "361-351",
number = "6",
volume = "72",
doi = "10.2298/HEMIND180516027J"
}

Jevremović, N., Veličković, S., Kalagasidis Krušić, M., Panić, V., Volkov-Husović, T., Jančić-Heinemann, R.,& Popović, I.. (2018). Image analysis as a useful tool for fast detection of dimensional and structural changes of poly(ethylene terephthalate) containers. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 72(6), 351-361.
https://doi.org/10.2298/HEMIND180516027J

Jevremović N, Veličković S, Kalagasidis Krušić M, Panić V, Volkov-Husović T, Jančić-Heinemann R, Popović I. Image analysis as a useful tool for fast detection of dimensional and structural changes of poly(ethylene terephthalate) containers. in Hemijska industrija. 2018;72(6):351-361.
doi:10.2298/HEMIND180516027J .

Jevremović, Nenad, Veličković, Sava, Kalagasidis Krušić, Melina, Panić, Vesna, Volkov-Husović, Tatjana, Jančić-Heinemann, Radmila, Popović, Ivanka, "Image analysis as a useful tool for fast detection of dimensional and structural changes of poly(ethylene terephthalate) containers" in Hemijska industrija, 72, no. 6 (2018):351-361,
https://doi.org/10.2298/HEMIND180516027J . .

TY  - JOUR
AU  - Šešlija, Sanja
AU  - Nešić, Aleksandra
AU  - Ružić, Jovana
AU  - Kalagasidis Krušić, Melina
AU  - Veličković, Sava
AU  - Avolio, Roberto
AU  - Santagata, Gabriella
AU  - Malinconico, Mario
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3951
AB  - The aim of this study was the development of novel polysaccharide based films intended to be used as edible food packaging material. The films were prepared by solution casting method using highly methoxylated pectin (PEC) and poly(ethylene glycol) (PEG) of various molecular weights (400, 600 and 1000 gmol(-1)) in different ratios (5:1, 3:1 and 1:1). The film formation was supported by hydrogen bonding between PEC and PEG, which was evidenced by means of ATR-FTIR and NMR analysis. TGA revealed that generally PEG behaves like a pro-degrading agent for pectin, except in the case of PEC/PEG film with a ratio of 1:1. Furthermore, DSC thermograms indicated that PEG1000 exists as a separate phase in the pectin matrix while the formulations with PEG400 and PEG600 showed mainly amorphous morphology. The addition of PEG enhanced the plasticization of PEC films, as evidenced by progressive decreasing of the glass transition temperature values (T-g). The tensile test measurements showed that increasing concentration of PEG produced weaker and more flexibile films. Due to the increased molecular mobility, the pectin phase became more permeable to water vapor as the PEG concentration increased. The obtained results showed that the combination of both polymers resulted in interesting bio -inspired edible films with the potential to compete with commercially used synthetic package materials.
PB  - Elsevier Sci Ltd, Oxford
T2  - Food Hydrocolloids
T1  - Edible blend films of pectin and poly(ethylene glycol): Preparation and physico-chemical evaluation
EP  - 501
SP  - 494
VL  - 77
DO  - 10.1016/j.foodhyd.2017.10.027
ER  - 

@article{
author = "Šešlija, Sanja and Nešić, Aleksandra and Ružić, Jovana and Kalagasidis Krušić, Melina and Veličković, Sava and Avolio, Roberto and Santagata, Gabriella and Malinconico, Mario",
year = "2018",
abstract = "The aim of this study was the development of novel polysaccharide based films intended to be used as edible food packaging material. The films were prepared by solution casting method using highly methoxylated pectin (PEC) and poly(ethylene glycol) (PEG) of various molecular weights (400, 600 and 1000 gmol(-1)) in different ratios (5:1, 3:1 and 1:1). The film formation was supported by hydrogen bonding between PEC and PEG, which was evidenced by means of ATR-FTIR and NMR analysis. TGA revealed that generally PEG behaves like a pro-degrading agent for pectin, except in the case of PEC/PEG film with a ratio of 1:1. Furthermore, DSC thermograms indicated that PEG1000 exists as a separate phase in the pectin matrix while the formulations with PEG400 and PEG600 showed mainly amorphous morphology. The addition of PEG enhanced the plasticization of PEC films, as evidenced by progressive decreasing of the glass transition temperature values (T-g). The tensile test measurements showed that increasing concentration of PEG produced weaker and more flexibile films. Due to the increased molecular mobility, the pectin phase became more permeable to water vapor as the PEG concentration increased. The obtained results showed that the combination of both polymers resulted in interesting bio -inspired edible films with the potential to compete with commercially used synthetic package materials.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Food Hydrocolloids",
title = "Edible blend films of pectin and poly(ethylene glycol): Preparation and physico-chemical evaluation",
pages = "501-494",
volume = "77",
doi = "10.1016/j.foodhyd.2017.10.027"
}

Šešlija, S., Nešić, A., Ružić, J., Kalagasidis Krušić, M., Veličković, S., Avolio, R., Santagata, G.,& Malinconico, M.. (2018). Edible blend films of pectin and poly(ethylene glycol): Preparation and physico-chemical evaluation. in Food Hydrocolloids
Elsevier Sci Ltd, Oxford., 77, 494-501.
https://doi.org/10.1016/j.foodhyd.2017.10.027

Šešlija S, Nešić A, Ružić J, Kalagasidis Krušić M, Veličković S, Avolio R, Santagata G, Malinconico M. Edible blend films of pectin and poly(ethylene glycol): Preparation and physico-chemical evaluation. in Food Hydrocolloids. 2018;77:494-501.
doi:10.1016/j.foodhyd.2017.10.027 .

Šešlija, Sanja, Nešić, Aleksandra, Ružić, Jovana, Kalagasidis Krušić, Melina, Veličković, Sava, Avolio, Roberto, Santagata, Gabriella, Malinconico, Mario, "Edible blend films of pectin and poly(ethylene glycol): Preparation and physico-chemical evaluation" in Food Hydrocolloids, 77 (2018):494-501,
https://doi.org/10.1016/j.foodhyd.2017.10.027 . .

TY  - JOUR
AU  - Šešlija, Sanja
AU  - Veljović, Đorđe
AU  - Kalagasidis Krušić, Melina
AU  - Stevanović, Jasmina
AU  - Veličković, Sava
AU  - Popović, Ivanka
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3462
AB  - The aim of this work was to investigate the influence of specific anions on the cross-linking process of highly methoxylated pectin using the following copper salts CuSO4; Cu(C2H3O2)(2); CuCl2; and Cu(NO3)(2) wherein the initial salt concentrations were varied from 0.5 up to 10 g l(-1). It was found that the anions affected the sorption capacity wherein the Cu2+ sorption capacity from the sulphate solution was the highest, while it decreased in the presence of CH3COO-, Cl- and NO3- ions, respectively. This difference was mostly pronounced at the higher initial salt concentrations (co(Cu2+)  gt  2 g l(-1)). The obtained beads were characterized by FTIR, MS, SEM/EDS microanalysis and mechanical compression tests up to 80% of deformation. The sorption data were applied to the Langmuir and Freundlich isotherm models and various calculated parameters confirmed the sulphate anion supportive nature in metal ion binding. The value of the K-f parameter for the cross-linking process of pectin in the presence of acetate, chloride and nitrate was approximately the same (K-f approximate to 0.027 g g(-1)), while it was higher in the presence of sulphate anions by more than 20% (K-f = 0.0352 g g(-1)). The predicted 1/n values (1/n  lt  1, 1/n  gt  1, 1/n = 1 for the sulphate, nitrate and acetate, and chloride anions, respectively) were the quantitative confirmation of the specific interactions involved in the cross-linking mechanism caused by different anions. The established anion influence was in accordance with the typical ion-specific influence on macromolecules in aqueous systems proposed by Hofmeister.
PB  - Royal Soc Chemistry, Cambridge
T2  - New Journal of Chemistry
T1  - Cross-linking of highly methoxylated pectin with copper: the specific anion influence
EP  - 1625
IS  - 2
SP  - 1618
VL  - 40
DO  - 10.1039/c5nj03320a
ER  - 

@article{
author = "Šešlija, Sanja and Veljović, Đorđe and Kalagasidis Krušić, Melina and Stevanović, Jasmina and Veličković, Sava and Popović, Ivanka",
year = "2016",
abstract = "The aim of this work was to investigate the influence of specific anions on the cross-linking process of highly methoxylated pectin using the following copper salts CuSO4; Cu(C2H3O2)(2); CuCl2; and Cu(NO3)(2) wherein the initial salt concentrations were varied from 0.5 up to 10 g l(-1). It was found that the anions affected the sorption capacity wherein the Cu2+ sorption capacity from the sulphate solution was the highest, while it decreased in the presence of CH3COO-, Cl- and NO3- ions, respectively. This difference was mostly pronounced at the higher initial salt concentrations (co(Cu2+)  gt  2 g l(-1)). The obtained beads were characterized by FTIR, MS, SEM/EDS microanalysis and mechanical compression tests up to 80% of deformation. The sorption data were applied to the Langmuir and Freundlich isotherm models and various calculated parameters confirmed the sulphate anion supportive nature in metal ion binding. The value of the K-f parameter for the cross-linking process of pectin in the presence of acetate, chloride and nitrate was approximately the same (K-f approximate to 0.027 g g(-1)), while it was higher in the presence of sulphate anions by more than 20% (K-f = 0.0352 g g(-1)). The predicted 1/n values (1/n  lt  1, 1/n  gt  1, 1/n = 1 for the sulphate, nitrate and acetate, and chloride anions, respectively) were the quantitative confirmation of the specific interactions involved in the cross-linking mechanism caused by different anions. The established anion influence was in accordance with the typical ion-specific influence on macromolecules in aqueous systems proposed by Hofmeister.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "New Journal of Chemistry",
title = "Cross-linking of highly methoxylated pectin with copper: the specific anion influence",
pages = "1625-1618",
number = "2",
volume = "40",
doi = "10.1039/c5nj03320a"
}

Šešlija, S., Veljović, Đ., Kalagasidis Krušić, M., Stevanović, J., Veličković, S.,& Popović, I.. (2016). Cross-linking of highly methoxylated pectin with copper: the specific anion influence. in New Journal of Chemistry
Royal Soc Chemistry, Cambridge., 40(2), 1618-1625.
https://doi.org/10.1039/c5nj03320a

Šešlija S, Veljović Đ, Kalagasidis Krušić M, Stevanović J, Veličković S, Popović I. Cross-linking of highly methoxylated pectin with copper: the specific anion influence. in New Journal of Chemistry. 2016;40(2):1618-1625.
doi:10.1039/c5nj03320a .

Šešlija, Sanja, Veljović, Đorđe, Kalagasidis Krušić, Melina, Stevanović, Jasmina, Veličković, Sava, Popović, Ivanka, "Cross-linking of highly methoxylated pectin with copper: the specific anion influence" in New Journal of Chemistry, 40, no. 2 (2016):1618-1625,
https://doi.org/10.1039/c5nj03320a . .

TY  - JOUR
AU  - Spasojević, Pavle
AU  - Panić, Vesna
AU  - Jović, Mihajlo D.
AU  - Marković, Jelena P.
AU  - van Roost, C.
AU  - Popović, Ivanka
AU  - Veličković, Sava
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3395
AB  - Mimicking the extraordinary performances of natural materials presents an attractive, but challenging approach in the synthesis of advanced functional materials. In the field of separation techniques, the design of a low-cost, regenerative, environmentally friendly sorbent and the utilization of most of its active centers to remove the targeted pollutant are everyday challenges. The combination of casein and poly(sodium methacrylate) (PMANa) in the form of a soft polymer network is proposed as a promising sorbent for the removal of Ni2+ from wastewater. Such a combination and an applied synthetic route form hybrid materials with better sorption properties than both their components alone. SEM and TEM show that caseinate micelles are dissociated and the more exposed protein structure is stabilized by the PMANa network and able to form various stable complexes. The achieved sorption capacity (224 mg g(-1)) is among the highest reported in the literature. The very high removal efficiency in the wide range of the initial Ni2+ concentrations (0.05-200 ppm) and easy and complete regeneration without decrease in sorption capacities make these low-cost materials highly sensitive sorbents attractive for use under real conditions where it is necessary to avoid environmental risks and provide the recovery and reuse of the metal.
PB  - Royal Soc Chemistry, Cambridge
T2  - Journal of Materials Chemistry A
T1  - Biomimic hybrid polymer networks based on casein and poly(methacrylic acid). Case study: Ni2+ removal
EP  - 1693
IS  - 5
SP  - 1680
VL  - 4
DO  - 10.1039/c5ta08424e
ER  - 

@article{
author = "Spasojević, Pavle and Panić, Vesna and Jović, Mihajlo D. and Marković, Jelena P. and van Roost, C. and Popović, Ivanka and Veličković, Sava",
year = "2016",
abstract = "Mimicking the extraordinary performances of natural materials presents an attractive, but challenging approach in the synthesis of advanced functional materials. In the field of separation techniques, the design of a low-cost, regenerative, environmentally friendly sorbent and the utilization of most of its active centers to remove the targeted pollutant are everyday challenges. The combination of casein and poly(sodium methacrylate) (PMANa) in the form of a soft polymer network is proposed as a promising sorbent for the removal of Ni2+ from wastewater. Such a combination and an applied synthetic route form hybrid materials with better sorption properties than both their components alone. SEM and TEM show that caseinate micelles are dissociated and the more exposed protein structure is stabilized by the PMANa network and able to form various stable complexes. The achieved sorption capacity (224 mg g(-1)) is among the highest reported in the literature. The very high removal efficiency in the wide range of the initial Ni2+ concentrations (0.05-200 ppm) and easy and complete regeneration without decrease in sorption capacities make these low-cost materials highly sensitive sorbents attractive for use under real conditions where it is necessary to avoid environmental risks and provide the recovery and reuse of the metal.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Journal of Materials Chemistry A",
title = "Biomimic hybrid polymer networks based on casein and poly(methacrylic acid). Case study: Ni2+ removal",
pages = "1693-1680",
number = "5",
volume = "4",
doi = "10.1039/c5ta08424e"
}

Spasojević, P., Panić, V., Jović, M. D., Marković, J. P., van Roost, C., Popović, I.,& Veličković, S.. (2016). Biomimic hybrid polymer networks based on casein and poly(methacrylic acid). Case study: Ni2+ removal. in Journal of Materials Chemistry A
Royal Soc Chemistry, Cambridge., 4(5), 1680-1693.
https://doi.org/10.1039/c5ta08424e

Spasojević P, Panić V, Jović MD, Marković JP, van Roost C, Popović I, Veličković S. Biomimic hybrid polymer networks based on casein and poly(methacrylic acid). Case study: Ni2+ removal. in Journal of Materials Chemistry A. 2016;4(5):1680-1693.
doi:10.1039/c5ta08424e .

Spasojević, Pavle, Panić, Vesna, Jović, Mihajlo D., Marković, Jelena P., van Roost, C., Popović, Ivanka, Veličković, Sava, "Biomimic hybrid polymer networks based on casein and poly(methacrylic acid). Case study: Ni2+ removal" in Journal of Materials Chemistry A, 4, no. 5 (2016):1680-1693,
https://doi.org/10.1039/c5ta08424e . .

TY  - JOUR
AU  - Nešić, Aleksandra
AU  - Panić, Vesna
AU  - Ostojić, Sanja
AU  - Micić, Darko
AU  - Pajić-Lijaković, Ivana
AU  - Onjia, Antonije
AU  - Veličković, Sava
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3415
AB  - This article described the synthesis and characterization of new copolymer hydrogels containing two hydrophilic units-methacrylic acid (MAA) and 2-Acrylamido-2-methylpropane sulfonic acid (AMPS). The resulting hydrogels were characterized by various techniques: FTIR, Elemental analysis, SEM, Dynamic Molecular simulation, Dynamic-Mechanical analysis and DSC in order to confirm the structure of hydrogels and to predict the best ratio composition with enhanced physical chemical properties. The swelling behavior in water was studied as a function of ratio of monomers and their concentration in medium. An increase in AMPS content led to expansion of network and increase in swelling degree capacity in water. An increase in AMPS content did not significantly influence the glass transition temperature of copolymers, indicated that the physical properties of initial components were preserved. The equal amount of monomers contributed to the highest strength of hydrogels. Meanwhile, the introduction of AMPS to the system was an effective method for improving the performances of the poly(methacrylic acid)- based hydrogels.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid
EP  - 163
SP  - 156
VL  - 174
DO  - 10.1016/j.matchemphys.2016.02.063
ER  - 

@article{
author = "Nešić, Aleksandra and Panić, Vesna and Ostojić, Sanja and Micić, Darko and Pajić-Lijaković, Ivana and Onjia, Antonije and Veličković, Sava",
year = "2016",
abstract = "This article described the synthesis and characterization of new copolymer hydrogels containing two hydrophilic units-methacrylic acid (MAA) and 2-Acrylamido-2-methylpropane sulfonic acid (AMPS). The resulting hydrogels were characterized by various techniques: FTIR, Elemental analysis, SEM, Dynamic Molecular simulation, Dynamic-Mechanical analysis and DSC in order to confirm the structure of hydrogels and to predict the best ratio composition with enhanced physical chemical properties. The swelling behavior in water was studied as a function of ratio of monomers and their concentration in medium. An increase in AMPS content led to expansion of network and increase in swelling degree capacity in water. An increase in AMPS content did not significantly influence the glass transition temperature of copolymers, indicated that the physical properties of initial components were preserved. The equal amount of monomers contributed to the highest strength of hydrogels. Meanwhile, the introduction of AMPS to the system was an effective method for improving the performances of the poly(methacrylic acid)- based hydrogels.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid",
pages = "163-156",
volume = "174",
doi = "10.1016/j.matchemphys.2016.02.063"
}

Nešić, A., Panić, V., Ostojić, S., Micić, D., Pajić-Lijaković, I., Onjia, A.,& Veličković, S.. (2016). Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 174, 156-163.
https://doi.org/10.1016/j.matchemphys.2016.02.063

Nešić A, Panić V, Ostojić S, Micić D, Pajić-Lijaković I, Onjia A, Veličković S. Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid. in Materials Chemistry and Physics. 2016;174:156-163.
doi:10.1016/j.matchemphys.2016.02.063 .

Nešić, Aleksandra, Panić, Vesna, Ostojić, Sanja, Micić, Darko, Pajić-Lijaković, Ivana, Onjia, Antonije, Veličković, Sava, "Physical-chemical behavior of novel copolymers composed of methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid" in Materials Chemistry and Physics, 174 (2016):156-163,
https://doi.org/10.1016/j.matchemphys.2016.02.063 . .

TY  - JOUR
AU  - Nešić, Aleksandra
AU  - Kokunešoski, Maja
AU  - Volkov-Husović, Tatjana
AU  - Veličković, Sava
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3444
AB  - In this work, a new method for the quantification of methyl violet cationic dye sorption onto SBA-15 mesoporous silica was developed. This method related the intensity of coloration of SBA-15 samples (after reached equilibrium sorption) within dye concentration in aqueous solution using Image-Pro Plus software. The sorption process of methyl violet dye onto SBA-15 was analyzed varying different initial parameters (dye concentration, mass of sorbent, pH of dye solution, and contact sorption time). SBA-15 proved as efficient sorbent for removal of methyl violet dye in contact time of 5 min, with maximum percentage of dye removal 99% at pH 8. The results obtained from Image-Pro Plus showed to be in good agreement with the sorption parameters obtained by UV/Vis spectroscopy, which has been the most commonly used instrument for quantification of dye sorption. The image analysis method proved well prediction of dye concentrations with maximum relative error of 1.83 %. The advantages of this method are low cost and reliable quantitative evaluation with minimum of time.
PB  - Springer, Dordrecht
T2  - Environmental Monitoring and Assessment
T1  - New method for quantification of dye sorption using SBA mesoporous silica as a target sorbent
IS  - 3
VL  - 188
DO  - 10.1007/s10661-016-5155-0
ER  - 

@article{
author = "Nešić, Aleksandra and Kokunešoski, Maja and Volkov-Husović, Tatjana and Veličković, Sava",
year = "2016",
abstract = "In this work, a new method for the quantification of methyl violet cationic dye sorption onto SBA-15 mesoporous silica was developed. This method related the intensity of coloration of SBA-15 samples (after reached equilibrium sorption) within dye concentration in aqueous solution using Image-Pro Plus software. The sorption process of methyl violet dye onto SBA-15 was analyzed varying different initial parameters (dye concentration, mass of sorbent, pH of dye solution, and contact sorption time). SBA-15 proved as efficient sorbent for removal of methyl violet dye in contact time of 5 min, with maximum percentage of dye removal 99% at pH 8. The results obtained from Image-Pro Plus showed to be in good agreement with the sorption parameters obtained by UV/Vis spectroscopy, which has been the most commonly used instrument for quantification of dye sorption. The image analysis method proved well prediction of dye concentrations with maximum relative error of 1.83 %. The advantages of this method are low cost and reliable quantitative evaluation with minimum of time.",
publisher = "Springer, Dordrecht",
journal = "Environmental Monitoring and Assessment",
title = "New method for quantification of dye sorption using SBA mesoporous silica as a target sorbent",
number = "3",
volume = "188",
doi = "10.1007/s10661-016-5155-0"
}

Nešić, A., Kokunešoski, M., Volkov-Husović, T.,& Veličković, S.. (2016). New method for quantification of dye sorption using SBA mesoporous silica as a target sorbent. in Environmental Monitoring and Assessment
Springer, Dordrecht., 188(3).
https://doi.org/10.1007/s10661-016-5155-0

Nešić A, Kokunešoski M, Volkov-Husović T, Veličković S. New method for quantification of dye sorption using SBA mesoporous silica as a target sorbent. in Environmental Monitoring and Assessment. 2016;188(3).
doi:10.1007/s10661-016-5155-0 .

Nešić, Aleksandra, Kokunešoski, Maja, Volkov-Husović, Tatjana, Veličković, Sava, "New method for quantification of dye sorption using SBA mesoporous silica as a target sorbent" in Environmental Monitoring and Assessment, 188, no. 3 (2016),
https://doi.org/10.1007/s10661-016-5155-0 . .

TY  - JOUR
AU  - Nešić, Aleksandra
AU  - Kokunešoski, Maja
AU  - Meseldžija, Slađana
AU  - Volkov-Husović, Tatjana
AU  - Veličković, Sava
AU  - Onjia, Antonije
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3297
AB  - In this work, the reliability of image analysis for the numerical evaluation of Basic Red 46 (BR 46) dye adsorption process was studied. The image analysis was carried out on dye adsorbed onto SBA-15 mesoporous silica, by use of Image-Pro Plus software. Pixel-specific calibration curves were derived and used to obtain dye concentration from the three different primary color channels (red, green, and blue) recorded at each pixel. In order to establish credibility of this method for quantification of adsorption processes, these data were compared with dye adsorption parameters obtained by UV-vis analysis. Among the three different primary color channels, the best results were obtained when the blue color channel was applied. In this case, the average relative error was 0.86%. The obtained results showed that a dye adsorbed on SBA-15 can be determined with the use of Image-Pro Plus with the same sensitivity as with the use of spectrophotometric analysis for the determination of changes in dye concentration during the adsorption process.
PB  - Wiley, Hoboken
T2  - Clean-Soil Air Water
T1  - Evaluation of Dye Adsorption Onto SBA-15 Using Image Analysis
EP  - 1328
IS  - 10
SP  - 1323
VL  - 44
DO  - 10.1002/clen.201500565
ER  - 

@article{
author = "Nešić, Aleksandra and Kokunešoski, Maja and Meseldžija, Slađana and Volkov-Husović, Tatjana and Veličković, Sava and Onjia, Antonije",
year = "2016",
abstract = "In this work, the reliability of image analysis for the numerical evaluation of Basic Red 46 (BR 46) dye adsorption process was studied. The image analysis was carried out on dye adsorbed onto SBA-15 mesoporous silica, by use of Image-Pro Plus software. Pixel-specific calibration curves were derived and used to obtain dye concentration from the three different primary color channels (red, green, and blue) recorded at each pixel. In order to establish credibility of this method for quantification of adsorption processes, these data were compared with dye adsorption parameters obtained by UV-vis analysis. Among the three different primary color channels, the best results were obtained when the blue color channel was applied. In this case, the average relative error was 0.86%. The obtained results showed that a dye adsorbed on SBA-15 can be determined with the use of Image-Pro Plus with the same sensitivity as with the use of spectrophotometric analysis for the determination of changes in dye concentration during the adsorption process.",
publisher = "Wiley, Hoboken",
journal = "Clean-Soil Air Water",
title = "Evaluation of Dye Adsorption Onto SBA-15 Using Image Analysis",
pages = "1328-1323",
number = "10",
volume = "44",
doi = "10.1002/clen.201500565"
}

Nešić, A., Kokunešoski, M., Meseldžija, S., Volkov-Husović, T., Veličković, S.,& Onjia, A.. (2016). Evaluation of Dye Adsorption Onto SBA-15 Using Image Analysis. in Clean-Soil Air Water
Wiley, Hoboken., 44(10), 1323-1328.
https://doi.org/10.1002/clen.201500565

Nešić A, Kokunešoski M, Meseldžija S, Volkov-Husović T, Veličković S, Onjia A. Evaluation of Dye Adsorption Onto SBA-15 Using Image Analysis. in Clean-Soil Air Water. 2016;44(10):1323-1328.
doi:10.1002/clen.201500565 .

Nešić, Aleksandra, Kokunešoski, Maja, Meseldžija, Slađana, Volkov-Husović, Tatjana, Veličković, Sava, Onjia, Antonije, "Evaluation of Dye Adsorption Onto SBA-15 Using Image Analysis" in Clean-Soil Air Water, 44, no. 10 (2016):1323-1328,
https://doi.org/10.1002/clen.201500565 . .

TY  - JOUR
AU  - Nešić, Aleksandra
AU  - Onjia, Antonije
AU  - Ostojić, Sanja B.
AU  - Micić, Darko
AU  - Veličković, Sava
AU  - Antonović, Dušan
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3384
AB  - Films of chitosan and poly(itaconic acid) in various different ratios have been prepared by membrane casting. The enhancement in the proton conductivity and uptake of water was observed as the content of poly(itaconic acid) in film increased. The proton conductivity of chitosan/poly(itaconic) films was comparative with commercially used synthetic sensor Nafion 117. Films showed thermal stability up to 185 degrees C. The proposed experiment might open up a new possibility for use of chitosan/poly(itaconic acid) films as a biosensors due to their advantages: low cost, simple preparation and good conductive sensitivity.
PB  - Elsevier Science Bv, Amsterdam
T2  - Materials Letters
T1  - Novel biosensor films based on chitosan
EP  - 49
SP  - 47
VL  - 167
DO  - 10.1016/j.matlet.2015.12.124
ER  - 

@article{
author = "Nešić, Aleksandra and Onjia, Antonije and Ostojić, Sanja B. and Micić, Darko and Veličković, Sava and Antonović, Dušan",
year = "2016",
abstract = "Films of chitosan and poly(itaconic acid) in various different ratios have been prepared by membrane casting. The enhancement in the proton conductivity and uptake of water was observed as the content of poly(itaconic acid) in film increased. The proton conductivity of chitosan/poly(itaconic) films was comparative with commercially used synthetic sensor Nafion 117. Films showed thermal stability up to 185 degrees C. The proposed experiment might open up a new possibility for use of chitosan/poly(itaconic acid) films as a biosensors due to their advantages: low cost, simple preparation and good conductive sensitivity.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Materials Letters",
title = "Novel biosensor films based on chitosan",
pages = "49-47",
volume = "167",
doi = "10.1016/j.matlet.2015.12.124"
}

Nešić, A., Onjia, A., Ostojić, S. B., Micić, D., Veličković, S.,& Antonović, D.. (2016). Novel biosensor films based on chitosan. in Materials Letters
Elsevier Science Bv, Amsterdam., 167, 47-49.
https://doi.org/10.1016/j.matlet.2015.12.124

Nešić A, Onjia A, Ostojić SB, Micić D, Veličković S, Antonović D. Novel biosensor films based on chitosan. in Materials Letters. 2016;167:47-49.
doi:10.1016/j.matlet.2015.12.124 .

Nešić, Aleksandra, Onjia, Antonije, Ostojić, Sanja B., Micić, Darko, Veličković, Sava, Antonović, Dušan, "Novel biosensor films based on chitosan" in Materials Letters, 167 (2016):47-49,
https://doi.org/10.1016/j.matlet.2015.12.124 . .

TY  - JOUR
AU  - Spasojević, Pavle
AU  - Zrilić, Milorad
AU  - Panić, Vesna
AU  - Stamenković, Dragoslav
AU  - Šešlija, Sanja
AU  - Veličković, Sava
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3129
AB  - This study investigates a wide range of clinically relevant mechanical properties of poly(methyl methacrylate) (PMMA) denture base materials modified with di-methyl itaconate (DMI) and di-n-butyl itaconate (DBI) in order to compare them to a commercial PMMA denture base material. The commercial denture base formulation was modified with DMI and DBI by replacing up to 10 wt% of methyl methacrylate (MMA) monomer. The specimens were prepared by standard bath curing process. The influence of the itaconate content on hardness, impact strength, tensile, and thermal and dynamic mechanical properties was investigated. It is found that the addition of di-n-alkyl itaconates gives homogenous blends that show decreased glass transition temperature, as well as decrease in storage modulus, ultimate tensile strength, and impact fracture resistance with increase in the itaconate content. The mean values of surface hardness show no significant change with the addition of itaconates. The magnitude of the measured values indicates that the poly(methyl methacrylate) (PMMA) denture base material modified with itaconates could be developed into a less toxic, more environmentally and patient friendly product than commercial pure PMMA denture base material.
PB  - Hindawi Ltd, London
T2  - International Journal of Polymer Science
T1  - The Mechanical Properties of a Poly(methyl methacrylate) Denture Base Material Modified with Dimethyl Itaconate and Di-n-butyl Itaconate
VL  - 2015
DO  - 10.1155/2015/561012
ER  - 

@article{
author = "Spasojević, Pavle and Zrilić, Milorad and Panić, Vesna and Stamenković, Dragoslav and Šešlija, Sanja and Veličković, Sava",
year = "2015",
abstract = "This study investigates a wide range of clinically relevant mechanical properties of poly(methyl methacrylate) (PMMA) denture base materials modified with di-methyl itaconate (DMI) and di-n-butyl itaconate (DBI) in order to compare them to a commercial PMMA denture base material. The commercial denture base formulation was modified with DMI and DBI by replacing up to 10 wt% of methyl methacrylate (MMA) monomer. The specimens were prepared by standard bath curing process. The influence of the itaconate content on hardness, impact strength, tensile, and thermal and dynamic mechanical properties was investigated. It is found that the addition of di-n-alkyl itaconates gives homogenous blends that show decreased glass transition temperature, as well as decrease in storage modulus, ultimate tensile strength, and impact fracture resistance with increase in the itaconate content. The mean values of surface hardness show no significant change with the addition of itaconates. The magnitude of the measured values indicates that the poly(methyl methacrylate) (PMMA) denture base material modified with itaconates could be developed into a less toxic, more environmentally and patient friendly product than commercial pure PMMA denture base material.",
publisher = "Hindawi Ltd, London",
journal = "International Journal of Polymer Science",
title = "The Mechanical Properties of a Poly(methyl methacrylate) Denture Base Material Modified with Dimethyl Itaconate and Di-n-butyl Itaconate",
volume = "2015",
doi = "10.1155/2015/561012"
}

Spasojević, P., Zrilić, M., Panić, V., Stamenković, D., Šešlija, S.,& Veličković, S.. (2015). The Mechanical Properties of a Poly(methyl methacrylate) Denture Base Material Modified with Dimethyl Itaconate and Di-n-butyl Itaconate. in International Journal of Polymer Science
Hindawi Ltd, London., 2015.
https://doi.org/10.1155/2015/561012

Spasojević P, Zrilić M, Panić V, Stamenković D, Šešlija S, Veličković S. The Mechanical Properties of a Poly(methyl methacrylate) Denture Base Material Modified with Dimethyl Itaconate and Di-n-butyl Itaconate. in International Journal of Polymer Science. 2015;2015.
doi:10.1155/2015/561012 .

Spasojević, Pavle, Zrilić, Milorad, Panić, Vesna, Stamenković, Dragoslav, Šešlija, Sanja, Veličković, Sava, "The Mechanical Properties of a Poly(methyl methacrylate) Denture Base Material Modified with Dimethyl Itaconate and Di-n-butyl Itaconate" in International Journal of Polymer Science, 2015 (2015),
https://doi.org/10.1155/2015/561012 . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Spasojević, Pavle
AU  - Radoman, Tijana S.
AU  - Džunuzović, Enis
AU  - Popović, Ivanka
AU  - Veličković, Sava
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3009
AB  - The poor stability and tendency to agglomerate of unfunctionalized nano-SiO2 in the presence of ionic species presents a challenge for preparing poly(methacrylic acid)/nano-SiO2 nanocomposite (NC) hydrogels with desired strength and swelling capability. We proposed a facile and eco-friendly method for the preparation of PMAA/SiO2 NC hydrogels using unfunctionalized silica nanoparticles (NPs) in the form of a suspension. SEM and TEM analyses showed that the NP distribution in the polymer matrix highly depended on the particle concentration. At lower concentrations (up to 13.9 wt %), the NPs were uniformly dispersed as single nanoparticles. With an increase in NP concentration, homogeneously dispersed nanoscale aggregates were formed, while a further increase in the silica concentration led to the formation of homogeneous structures consisting of mutually interacting nanosilica particles coated with PMAA. Swelling experiments confirmed that the silica NPs behaved as adhesive fillers that interacted with PMAA chains, causing the formation of a thin polymer layer strongly adsorbed at the particle interface. The thicknesses of the adsorbed polymer layer, as well as the swelling kinetic parameters, were strongly influenced by nanoparticle size and concentration. Combining nanosilica and PMAA in the form of a soft hydrogel network provided stabilization of the NPs and ensured better mechanical properties of the obtained NC hydrogels compared to pure polymer matrix. The optimal loadings, necessary to ensure the most improved dynamical-mechanical properties, were found in the case of the formation of homogeneously dispersed, nanosized silica aggregates in a PMAA matrix.
PB  - Amer Chemical Soc, Washington
T2  - Journal of Physical Chemistry C
T1  - Methacrylic Acid Based Polymer Networks with a High Content of Unfunctionalized Nanosilica: Particle Distribution, Swelling, and Rheological Properties
EP  - 622
IS  - 1
SP  - 610
VL  - 119
DO  - 10.1021/jp5020548
ER  - 

@article{
author = "Panić, Vesna and Spasojević, Pavle and Radoman, Tijana S. and Džunuzović, Enis and Popović, Ivanka and Veličković, Sava",
year = "2015",
abstract = "The poor stability and tendency to agglomerate of unfunctionalized nano-SiO2 in the presence of ionic species presents a challenge for preparing poly(methacrylic acid)/nano-SiO2 nanocomposite (NC) hydrogels with desired strength and swelling capability. We proposed a facile and eco-friendly method for the preparation of PMAA/SiO2 NC hydrogels using unfunctionalized silica nanoparticles (NPs) in the form of a suspension. SEM and TEM analyses showed that the NP distribution in the polymer matrix highly depended on the particle concentration. At lower concentrations (up to 13.9 wt %), the NPs were uniformly dispersed as single nanoparticles. With an increase in NP concentration, homogeneously dispersed nanoscale aggregates were formed, while a further increase in the silica concentration led to the formation of homogeneous structures consisting of mutually interacting nanosilica particles coated with PMAA. Swelling experiments confirmed that the silica NPs behaved as adhesive fillers that interacted with PMAA chains, causing the formation of a thin polymer layer strongly adsorbed at the particle interface. The thicknesses of the adsorbed polymer layer, as well as the swelling kinetic parameters, were strongly influenced by nanoparticle size and concentration. Combining nanosilica and PMAA in the form of a soft hydrogel network provided stabilization of the NPs and ensured better mechanical properties of the obtained NC hydrogels compared to pure polymer matrix. The optimal loadings, necessary to ensure the most improved dynamical-mechanical properties, were found in the case of the formation of homogeneously dispersed, nanosized silica aggregates in a PMAA matrix.",
publisher = "Amer Chemical Soc, Washington",
journal = "Journal of Physical Chemistry C",
title = "Methacrylic Acid Based Polymer Networks with a High Content of Unfunctionalized Nanosilica: Particle Distribution, Swelling, and Rheological Properties",
pages = "622-610",
number = "1",
volume = "119",
doi = "10.1021/jp5020548"
}

Panić, V., Spasojević, P., Radoman, T. S., Džunuzović, E., Popović, I.,& Veličković, S.. (2015). Methacrylic Acid Based Polymer Networks with a High Content of Unfunctionalized Nanosilica: Particle Distribution, Swelling, and Rheological Properties. in Journal of Physical Chemistry C
Amer Chemical Soc, Washington., 119(1), 610-622.
https://doi.org/10.1021/jp5020548

Panić V, Spasojević P, Radoman TS, Džunuzović E, Popović I, Veličković S. Methacrylic Acid Based Polymer Networks with a High Content of Unfunctionalized Nanosilica: Particle Distribution, Swelling, and Rheological Properties. in Journal of Physical Chemistry C. 2015;119(1):610-622.
doi:10.1021/jp5020548 .

Panić, Vesna, Spasojević, Pavle, Radoman, Tijana S., Džunuzović, Enis, Popović, Ivanka, Veličković, Sava, "Methacrylic Acid Based Polymer Networks with a High Content of Unfunctionalized Nanosilica: Particle Distribution, Swelling, and Rheological Properties" in Journal of Physical Chemistry C, 119, no. 1 (2015):610-622,
https://doi.org/10.1021/jp5020548 . .

TY  - JOUR
AU  - Spasojević, Pavle
AU  - Panić, Vesna
AU  - Šešlija, Sanja
AU  - Nikolić, Vladimir
AU  - Popović, Ivanka
AU  - Veličković, Sava
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3066
AB  - The aim of this work was to examine the possibility of modification of commercial denture base materials with itaconic acid esters, in order to obtain materials with lower toxicity and higher biocompatibility. Despite their relatively higher price compared to methacrylates, itaconic acid and itaconates are materials of choice for environmentally friendly applications, because they are not produced from petrochemical sources, but from plant products. A commercial system based on poly(methyl methacrylate) was modified using ditetrahydrofurfuryl itaconate (DTHFI), whereby the ratio of DTHFI was varied from 2.5 to 10 % by weight. Copolymerization was confirmed using FTIR spectroscopy, while SEM analysis showed the absence of micro defects and pores in the structure. The effects of the itaconate content on the absorption of fluids, the residual monomer content, thermal, dynamic-mechanical and mechanical properties (hardness, toughness, stress and elongation at break) were investigated. It was found that the addition of DTHFI significantly reduced the amount of residual methyl methacrylate, which made these materials less toxic. It was shown that increasing the DTHFI content resulted in materials with decreased glass transition temperatures, as well as with decreased storage modulus, ultimate tensile strength and impact fracture resistance; however the mechanical properties were in the rang prescribed by ADA standards, and the materials could be used in practice. The deterioration in mechanical properties was therefore worthwhile in order to gain lower toxicity of the leached monomer.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties
EP  - +
IS  - 9
SP  - 1177
VL  - 80
DO  - 10.2298/JSC150123034S
ER  - 

@article{
author = "Spasojević, Pavle and Panić, Vesna and Šešlija, Sanja and Nikolić, Vladimir and Popović, Ivanka and Veličković, Sava",
year = "2015",
abstract = "The aim of this work was to examine the possibility of modification of commercial denture base materials with itaconic acid esters, in order to obtain materials with lower toxicity and higher biocompatibility. Despite their relatively higher price compared to methacrylates, itaconic acid and itaconates are materials of choice for environmentally friendly applications, because they are not produced from petrochemical sources, but from plant products. A commercial system based on poly(methyl methacrylate) was modified using ditetrahydrofurfuryl itaconate (DTHFI), whereby the ratio of DTHFI was varied from 2.5 to 10 % by weight. Copolymerization was confirmed using FTIR spectroscopy, while SEM analysis showed the absence of micro defects and pores in the structure. The effects of the itaconate content on the absorption of fluids, the residual monomer content, thermal, dynamic-mechanical and mechanical properties (hardness, toughness, stress and elongation at break) were investigated. It was found that the addition of DTHFI significantly reduced the amount of residual methyl methacrylate, which made these materials less toxic. It was shown that increasing the DTHFI content resulted in materials with decreased glass transition temperatures, as well as with decreased storage modulus, ultimate tensile strength and impact fracture resistance; however the mechanical properties were in the rang prescribed by ADA standards, and the materials could be used in practice. The deterioration in mechanical properties was therefore worthwhile in order to gain lower toxicity of the leached monomer.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties",
pages = "+-1177",
number = "9",
volume = "80",
doi = "10.2298/JSC150123034S"
}

Spasojević, P., Panić, V., Šešlija, S., Nikolić, V., Popović, I.,& Veličković, S.. (2015). Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 80(9), 1177-+.
https://doi.org/10.2298/JSC150123034S

Spasojević P, Panić V, Šešlija S, Nikolić V, Popović I, Veličković S. Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties. in Journal of the Serbian Chemical Society. 2015;80(9):1177-+.
doi:10.2298/JSC150123034S .

Spasojević, Pavle, Panić, Vesna, Šešlija, Sanja, Nikolić, Vladimir, Popović, Ivanka, Veličković, Sava, "Poly(methyl methacrylate) denture base materials modified with ditetrahydrofurfuryl itaconate: Significant applicative properties" in Journal of the Serbian Chemical Society, 80, no. 9 (2015):1177-+,
https://doi.org/10.2298/JSC150123034S . .

TY  - JOUR
AU  - Nešić, Aleksandra
AU  - Panić, Vesna
AU  - Onjia, Antonije
AU  - Veličković, Sava
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2967
AB  - In this study novel copolymer hydrogels based on methacrylic acid (MAA) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) were synthesized by free-radical aqueous copolymerization and characterized. Derived P(MAA-co-AMPS) hydrogels, joining well the affection of numerous anionic groups toward cations and the accessibility of active sites in the swollen network were recognized as potential sorbents for removal of cationic species. The effect of various initial parameters on sorption of two cationic dyes onto P(MAA-co-AMPS) hydrogels was investigated in both, single and binary, systems. Results showed that the copolymerization of MAA and AMPS significantly increased sorption capability of copolymers compared to both pure-component hydrogels-PMAA and PAMPS hydrogels. The main advantage of novel copolymer hydrogels is enhanced sorption of dyes in binary systems, reaching maximal values of 98.8% (Basic Yellow 28) and 96.4 (Basic Red 46), onto hydrogel P (MAA-co-AMPS) 50/50. The desorption rate of BY28 and BR46 in both, single and in binary, systems increased with the increase in AMPS content in hydrogels. This investigation showed that copolymerization of two acidic monomers, bearing different types of acid groups, could significantly improve the sorption thus decreasing the price and the amount of material needed for successful removal of pollutants.
PB  - Elsevier Science Bv, Amsterdam
T2  - Colloids and Surfaces A-Physicochemical and Engineering Aspects
T1  - The enhanced removal of cationic dyes in binary system using novel copolymers with two kinds of acidic groups
EP  - 34
SP  - 24
VL  - 476
DO  - 10.1016/j.colsurfa.2015.03.013
ER  - 

@article{
author = "Nešić, Aleksandra and Panić, Vesna and Onjia, Antonije and Veličković, Sava",
year = "2015",
abstract = "In this study novel copolymer hydrogels based on methacrylic acid (MAA) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) were synthesized by free-radical aqueous copolymerization and characterized. Derived P(MAA-co-AMPS) hydrogels, joining well the affection of numerous anionic groups toward cations and the accessibility of active sites in the swollen network were recognized as potential sorbents for removal of cationic species. The effect of various initial parameters on sorption of two cationic dyes onto P(MAA-co-AMPS) hydrogels was investigated in both, single and binary, systems. Results showed that the copolymerization of MAA and AMPS significantly increased sorption capability of copolymers compared to both pure-component hydrogels-PMAA and PAMPS hydrogels. The main advantage of novel copolymer hydrogels is enhanced sorption of dyes in binary systems, reaching maximal values of 98.8% (Basic Yellow 28) and 96.4 (Basic Red 46), onto hydrogel P (MAA-co-AMPS) 50/50. The desorption rate of BY28 and BR46 in both, single and in binary, systems increased with the increase in AMPS content in hydrogels. This investigation showed that copolymerization of two acidic monomers, bearing different types of acid groups, could significantly improve the sorption thus decreasing the price and the amount of material needed for successful removal of pollutants.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Colloids and Surfaces A-Physicochemical and Engineering Aspects",
title = "The enhanced removal of cationic dyes in binary system using novel copolymers with two kinds of acidic groups",
pages = "34-24",
volume = "476",
doi = "10.1016/j.colsurfa.2015.03.013"
}

Nešić, A., Panić, V., Onjia, A.,& Veličković, S.. (2015). The enhanced removal of cationic dyes in binary system using novel copolymers with two kinds of acidic groups. in Colloids and Surfaces A-Physicochemical and Engineering Aspects
Elsevier Science Bv, Amsterdam., 476, 24-34.
https://doi.org/10.1016/j.colsurfa.2015.03.013

Nešić A, Panić V, Onjia A, Veličković S. The enhanced removal of cationic dyes in binary system using novel copolymers with two kinds of acidic groups. in Colloids and Surfaces A-Physicochemical and Engineering Aspects. 2015;476:24-34.
doi:10.1016/j.colsurfa.2015.03.013 .

Nešić, Aleksandra, Panić, Vesna, Onjia, Antonije, Veličković, Sava, "The enhanced removal of cationic dyes in binary system using novel copolymers with two kinds of acidic groups" in Colloids and Surfaces A-Physicochemical and Engineering Aspects, 476 (2015):24-34,
https://doi.org/10.1016/j.colsurfa.2015.03.013 . .

TY  - CONF
AU  - Nešić, Aleksandra
AU  - Onjia, Antonije
AU  - Veličković, Sava
AU  - Antonović, Dušan
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3079
AB  - Environmental protection has been a topic of great interest in recent years. Discharging azo dyes in aquatic systems contaminates water and causes serious ecological problems. Azo dyes are bio-accumulative, and, due to allergenic, carcinogenic and mutagenic properties, are a grave threat to people and the environment. Because of economic feasibility, simplicity and a high efficiency, adsorption is the most suitable process for treatment of wastewater. The increasingly interesting bio-degradable adsorbents are those that stem from ecologically and economically sustainable sources. The aim of the study is preparation and characterisation of polymer complexes based on naturally occurring polysaccharide-chitosan and poly( itaconic acid), as an adsorbent for removal of Reactive Orange 16 dye from wastewater. The complexes are characterised by Fourier-Transform Infrared Spectroscopy and Scanning electron microscopy. The effect of initial dye concentration, temperature and pH value of the solution on the adsorption capacities is investigated. Comparison of the obtained results with reported data shows the studied complex being an efficiently replacement for conventional adsorbents removing Reactive Orange 16 from wastewater.
PB  - Springer Int Publishing Ag, Cham
C3  - Sustainable Development, Knowledge Society and Smart Future Manufacturing Technologies
T1  - Preparation and Characterisation of Novel Biodegradable Material Based on Chitosan and Poly(Itaconic Acid) as Adsorbent for Removal of Reactive Orange 16 Dye from Wastewater
EP  - 251
SP  - 243
DO  - 10.1007/978-3-319-14883-0_18
ER  - 

@conference{
author = "Nešić, Aleksandra and Onjia, Antonije and Veličković, Sava and Antonović, Dušan",
year = "2015",
abstract = "Environmental protection has been a topic of great interest in recent years. Discharging azo dyes in aquatic systems contaminates water and causes serious ecological problems. Azo dyes are bio-accumulative, and, due to allergenic, carcinogenic and mutagenic properties, are a grave threat to people and the environment. Because of economic feasibility, simplicity and a high efficiency, adsorption is the most suitable process for treatment of wastewater. The increasingly interesting bio-degradable adsorbents are those that stem from ecologically and economically sustainable sources. The aim of the study is preparation and characterisation of polymer complexes based on naturally occurring polysaccharide-chitosan and poly( itaconic acid), as an adsorbent for removal of Reactive Orange 16 dye from wastewater. The complexes are characterised by Fourier-Transform Infrared Spectroscopy and Scanning electron microscopy. The effect of initial dye concentration, temperature and pH value of the solution on the adsorption capacities is investigated. Comparison of the obtained results with reported data shows the studied complex being an efficiently replacement for conventional adsorbents removing Reactive Orange 16 from wastewater.",
publisher = "Springer Int Publishing Ag, Cham",
journal = "Sustainable Development, Knowledge Society and Smart Future Manufacturing Technologies",
title = "Preparation and Characterisation of Novel Biodegradable Material Based on Chitosan and Poly(Itaconic Acid) as Adsorbent for Removal of Reactive Orange 16 Dye from Wastewater",
pages = "251-243",
doi = "10.1007/978-3-319-14883-0_18"
}

Nešić, A., Onjia, A., Veličković, S.,& Antonović, D.. (2015). Preparation and Characterisation of Novel Biodegradable Material Based on Chitosan and Poly(Itaconic Acid) as Adsorbent for Removal of Reactive Orange 16 Dye from Wastewater. in Sustainable Development, Knowledge Society and Smart Future Manufacturing Technologies
Springer Int Publishing Ag, Cham., 243-251.
https://doi.org/10.1007/978-3-319-14883-0_18

Nešić A, Onjia A, Veličković S, Antonović D. Preparation and Characterisation of Novel Biodegradable Material Based on Chitosan and Poly(Itaconic Acid) as Adsorbent for Removal of Reactive Orange 16 Dye from Wastewater. in Sustainable Development, Knowledge Society and Smart Future Manufacturing Technologies. 2015;:243-251.
doi:10.1007/978-3-319-14883-0_18 .

Nešić, Aleksandra, Onjia, Antonije, Veličković, Sava, Antonović, Dušan, "Preparation and Characterisation of Novel Biodegradable Material Based on Chitosan and Poly(Itaconic Acid) as Adsorbent for Removal of Reactive Orange 16 Dye from Wastewater" in Sustainable Development, Knowledge Society and Smart Future Manufacturing Technologies (2015):243-251,
https://doi.org/10.1007/978-3-319-14883-0_18 . .

TY  - CONF
AU  - Nešić, Aleksandra R.
AU  - Panić, Vesna V.
AU  - Veličković, Sava J.
AU  - Onjia, Antonije E.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7132
AB  - Hidrogelovi predstavljaju trodimenzionalno umrežene polimere koji imaju sposobnost da apsorbuju
veliku zapreminu vode ili fizioloških tečnosti. Zahvaljujući prisustvu hidrofilnih grupa kao što su –OH,
–CONH, –CONH2, –COOH ili –SO3H mogu da sadrže i do više hiljada puta veću masu vode u odnosu na
masu suvog uzorka pri čemu njihova struktura ostaje nepromenjena. Hidrogelovi na bazi metakrilne
kiseline spadaju u grupu pH-osetljivih hidrogelova. Ovi pH-osetljivi hidrogelovi bubre i do 700 puta u
vodi, u odnosu na svoju početnu zapreminu. Hidrogelovi na bazi metakrilne kiseline su našli primenu u
biomedicini, za otpuštanje aktivnih materija i selektivno vezivanje različitih jona i njihovo uklanjanje iz
rastvora, za proizvodnju higijenskih proizvoda, u poljoprivredi itd1
. Hidrogelovi na bazi 2-akrilamido-2-
-metilpropansulfonske kiseline (AMPS) poseduju visok stepen hidrofilnosti u širokom opsegu pH zbog
prisustva sulfonske grupe u svojoj strukturi, dok prisustvo dimetil grupe pruža termičku stabilnost.
Visok stepen apsorcije vode i sposobnost bubrenja omogućili su široku primenu hidrogelova na bazi
AMPS-a
2
. Ovi hidrogelovi su biokompatibilni, imaju uniformnu provodljivost, kohezionu snagu, postižu
zadovoljavajuću adheziju na koži zbog čega se koriste u medicini kao komponente zavoja, za izradu
elektrokardiografskih i defibrilacijskih elektroda. Kopolimeri AMPS-a i drugih hidrofilnih monomera,
kao što su akrilna kiselina, itakonska kiselina ili N-vinil pirolidin, su ispitivani za primenu u preradi
otpadnih voda3,4.Cilj ovog rada je dobijanje novog hidrogela na bazi metakrilne kiseline i AMPS-a, koji
posedovanjem 2 različite funkcionalne grupe u svojoj strukturi može povećati efikasnost prečišćavanja
obojenih otpadnih voda naspram referentnih hidrogelova PMAA i PAMPS.
AB  - In this study novel copolymer hydrogels based on methacrylic acid and 2-acrylamido-2-methylpropane sulfonic
acid were synthesized by free-radical aqueous copolymerization at 70 °C for 5 hours. These hydrogels were
characterized by FTIR spectroscopy, equilibrium swelling degree and sorption of Basic Yellow 28 and Basic
Red 46 dye in single and binary system. The ratio of comonomers in reaction mixture affected the properties of
resulting copolymers, as the equilibrium swelling degree increased with the increase in AMPS content in
hydrogel. The synthesized hydrogels showed better sorption in binary system compared to the sorption of these
dyes in single system, probably due to different ability of hydrogel functional groups to interact with cationic
dyes. The maximal percent removal of Basic Yellow 28 and Basic Red 46 dyes were observed by P(MAA-coAMPS) 50/50 hydrogel and reached values of 96.4% and 98.3%, respectively. Desorption of BY28 and BR46,
in both, single and binary system increased with the increase of AMPS content in hydrogel.
PB  - Beograd : Srpsko hemijsko društvo
C3  - Knjiga radova / 51. savetovanje Srpskog hemijskog društva i 2. konferencija mladih hemičara Srbije, Niš, 5-7. juni 2014
T1  - Sinteza i karakterizacija kopolimernih  hidrogelova na bazi metakrilne kiseline i 2-akrilamido-2-metilpropansulfonske kiseline
T1  - Synthesis and characterization of copolymer hydrogels based on methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid
EP  - 91
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7132
ER  - 

@conference{
author = "Nešić, Aleksandra R. and Panić, Vesna V. and Veličković, Sava J. and Onjia, Antonije E.",
year = "2014",
abstract = "Hidrogelovi predstavljaju trodimenzionalno umrežene polimere koji imaju sposobnost da apsorbuju
veliku zapreminu vode ili fizioloških tečnosti. Zahvaljujući prisustvu hidrofilnih grupa kao što su –OH,
–CONH, –CONH2, –COOH ili –SO3H mogu da sadrže i do više hiljada puta veću masu vode u odnosu na
masu suvog uzorka pri čemu njihova struktura ostaje nepromenjena. Hidrogelovi na bazi metakrilne
kiseline spadaju u grupu pH-osetljivih hidrogelova. Ovi pH-osetljivi hidrogelovi bubre i do 700 puta u
vodi, u odnosu na svoju početnu zapreminu. Hidrogelovi na bazi metakrilne kiseline su našli primenu u
biomedicini, za otpuštanje aktivnih materija i selektivno vezivanje različitih jona i njihovo uklanjanje iz
rastvora, za proizvodnju higijenskih proizvoda, u poljoprivredi itd1
. Hidrogelovi na bazi 2-akrilamido-2-
-metilpropansulfonske kiseline (AMPS) poseduju visok stepen hidrofilnosti u širokom opsegu pH zbog
prisustva sulfonske grupe u svojoj strukturi, dok prisustvo dimetil grupe pruža termičku stabilnost.
Visok stepen apsorcije vode i sposobnost bubrenja omogućili su široku primenu hidrogelova na bazi
AMPS-a
2
. Ovi hidrogelovi su biokompatibilni, imaju uniformnu provodljivost, kohezionu snagu, postižu
zadovoljavajuću adheziju na koži zbog čega se koriste u medicini kao komponente zavoja, za izradu
elektrokardiografskih i defibrilacijskih elektroda. Kopolimeri AMPS-a i drugih hidrofilnih monomera,
kao što su akrilna kiselina, itakonska kiselina ili N-vinil pirolidin, su ispitivani za primenu u preradi
otpadnih voda3,4.Cilj ovog rada je dobijanje novog hidrogela na bazi metakrilne kiseline i AMPS-a, koji
posedovanjem 2 različite funkcionalne grupe u svojoj strukturi može povećati efikasnost prečišćavanja
obojenih otpadnih voda naspram referentnih hidrogelova PMAA i PAMPS., In this study novel copolymer hydrogels based on methacrylic acid and 2-acrylamido-2-methylpropane sulfonic
acid were synthesized by free-radical aqueous copolymerization at 70 °C for 5 hours. These hydrogels were
characterized by FTIR spectroscopy, equilibrium swelling degree and sorption of Basic Yellow 28 and Basic
Red 46 dye in single and binary system. The ratio of comonomers in reaction mixture affected the properties of
resulting copolymers, as the equilibrium swelling degree increased with the increase in AMPS content in
hydrogel. The synthesized hydrogels showed better sorption in binary system compared to the sorption of these
dyes in single system, probably due to different ability of hydrogel functional groups to interact with cationic
dyes. The maximal percent removal of Basic Yellow 28 and Basic Red 46 dyes were observed by P(MAA-coAMPS) 50/50 hydrogel and reached values of 96.4% and 98.3%, respectively. Desorption of BY28 and BR46,
in both, single and binary system increased with the increase of AMPS content in hydrogel.",
publisher = "Beograd : Srpsko hemijsko društvo",
journal = "Knjiga radova / 51. savetovanje Srpskog hemijskog društva i 2. konferencija mladih hemičara Srbije, Niš, 5-7. juni 2014",
title = "Sinteza i karakterizacija kopolimernih  hidrogelova na bazi metakrilne kiseline i 2-akrilamido-2-metilpropansulfonske kiseline, Synthesis and characterization of copolymer hydrogels based on methacrylic acid and 2-acrylamido-2-methylpropane sulfonic acid",
pages = "91-87",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7132"
}

Nešić, A. R., Panić, V. V., Veličković, S. J.,& Onjia, A. E.. (2014). Sinteza i karakterizacija kopolimernih  hidrogelova na bazi metakrilne kiseline i 2-akrilamido-2-metilpropansulfonske kiseline. in Knjiga radova / 51. savetovanje Srpskog hemijskog društva i 2. konferencija mladih hemičara Srbije, Niš, 5-7. juni 2014
Beograd : Srpsko hemijsko društvo., 87-91.
https://hdl.handle.net/21.15107/rcub_technorep_7132

Nešić AR, Panić VV, Veličković SJ, Onjia AE. Sinteza i karakterizacija kopolimernih  hidrogelova na bazi metakrilne kiseline i 2-akrilamido-2-metilpropansulfonske kiseline. in Knjiga radova / 51. savetovanje Srpskog hemijskog društva i 2. konferencija mladih hemičara Srbije, Niš, 5-7. juni 2014. 2014;:87-91.
https://hdl.handle.net/21.15107/rcub_technorep_7132 .

Nešić, Aleksandra R., Panić, Vesna V., Veličković, Sava J., Onjia, Antonije E., "Sinteza i karakterizacija kopolimernih  hidrogelova na bazi metakrilne kiseline i 2-akrilamido-2-metilpropansulfonske kiseline" in Knjiga radova / 51. savetovanje Srpskog hemijskog društva i 2. konferencija mladih hemičara Srbije, Niš, 5-7. juni 2014 (2014):87-91,
https://hdl.handle.net/21.15107/rcub_technorep_7132 .

TY  - JOUR
AU  - Panić, Vesna
AU  - Veličković, Sava
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2762
AB  - Composites based on poly(methacrylic acid) (PMAA) and two types of zeolite, hydrophilic zeolite A and hydrophobic zeolite ZSM-5, were synthesized. The obtained hydrogel composites that combine well the strong interaction between PMAA and cationic species, the accessibility of active sites in the swollen network and fine mechanical stability of zeolites are considered promising candidates for removal of cationic dye, basic yellow 28 (BY28) from aqueous solutions. The adsorption was found to be highly dependent on composition of hydrogel composites, initial dye concentration, solution pH, sorbent mass and temperature, while the effect of zeolite type is less manifested. It was found that the surface adsorption influenced the kinetics of adsorption which was determined by the rate of movement of the boundary layer of BY28 adsorbed on hydrogel surface. Adsorption processes were found to be favorable and preferably physical in nature with maximum adsorption capacity that could reach up to 180 mg/g for PMAA/30A hydrogel composite. Image analysis was applied on differently colored hydrogels and revealed the linear correlation between equilibrium adsorption capacities and the mean values of pixel intensity, as well as the strong effect of initial dye concentration on uniformity of coloration along the hydrogel diameter.
PB  - Elsevier, Amsterdam
T2  - Separation and Purification Technology
T1  - Removal of model cationic dye by adsorption onto poly(methacrylic acid)/zeolite hydrogel composites: Kinetics, equilibrium study and image analysis
EP  - 394
SP  - 384
VL  - 122
DO  - 10.1016/j.seppur.2013.11.025
ER  - 

@article{
author = "Panić, Vesna and Veličković, Sava",
year = "2014",
abstract = "Composites based on poly(methacrylic acid) (PMAA) and two types of zeolite, hydrophilic zeolite A and hydrophobic zeolite ZSM-5, were synthesized. The obtained hydrogel composites that combine well the strong interaction between PMAA and cationic species, the accessibility of active sites in the swollen network and fine mechanical stability of zeolites are considered promising candidates for removal of cationic dye, basic yellow 28 (BY28) from aqueous solutions. The adsorption was found to be highly dependent on composition of hydrogel composites, initial dye concentration, solution pH, sorbent mass and temperature, while the effect of zeolite type is less manifested. It was found that the surface adsorption influenced the kinetics of adsorption which was determined by the rate of movement of the boundary layer of BY28 adsorbed on hydrogel surface. Adsorption processes were found to be favorable and preferably physical in nature with maximum adsorption capacity that could reach up to 180 mg/g for PMAA/30A hydrogel composite. Image analysis was applied on differently colored hydrogels and revealed the linear correlation between equilibrium adsorption capacities and the mean values of pixel intensity, as well as the strong effect of initial dye concentration on uniformity of coloration along the hydrogel diameter.",
publisher = "Elsevier, Amsterdam",
journal = "Separation and Purification Technology",
title = "Removal of model cationic dye by adsorption onto poly(methacrylic acid)/zeolite hydrogel composites: Kinetics, equilibrium study and image analysis",
pages = "394-384",
volume = "122",
doi = "10.1016/j.seppur.2013.11.025"
}

Panić, V.,& Veličković, S.. (2014). Removal of model cationic dye by adsorption onto poly(methacrylic acid)/zeolite hydrogel composites: Kinetics, equilibrium study and image analysis. in Separation and Purification Technology
Elsevier, Amsterdam., 122, 384-394.
https://doi.org/10.1016/j.seppur.2013.11.025

Panić V, Veličković S. Removal of model cationic dye by adsorption onto poly(methacrylic acid)/zeolite hydrogel composites: Kinetics, equilibrium study and image analysis. in Separation and Purification Technology. 2014;122:384-394.
doi:10.1016/j.seppur.2013.11.025 .

Panić, Vesna, Veličković, Sava, "Removal of model cationic dye by adsorption onto poly(methacrylic acid)/zeolite hydrogel composites: Kinetics, equilibrium study and image analysis" in Separation and Purification Technology, 122 (2014):384-394,
https://doi.org/10.1016/j.seppur.2013.11.025 . .

TY  - JOUR
AU  - Radovanović, Filip
AU  - Nastasović, Aleksandra
AU  - Tomković, Tanja
AU  - Vasiljević-Radović, Dana
AU  - Nešić, Aleksandra
AU  - Veličković, Sava
AU  - Onjia, Antonije
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2836
AB  - Asymmetric polyethersulfone membranes with submicron particles comprising crosslinked glycidyl methacrylate copolymer were prepared by a combination of a traditional immersion precipitation process for making membranes with photopolymerization and crosslinking of functional monomers included in the casting solution. As the concentration of polymerizable monomers increased the original macrovoid structure was replaced by a hybrid morphology with microglobules typical of macroporous methacrylate adsorbers embedded within microporous structure with no significant effects on water permeability. The epoxide groups present in glycidyl methacrylate copolymer were transformed into amine functionalities by ring opening under alkaline conditions. Permeation of Orange G solution at low transmembrane pressures was used to demonstrate suitability of these novel membranes for membrane adsorption.
PB  - Elsevier Science Bv, Amsterdam
T2  - Reactive & Functional Polymers
T1  - Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate
EP  - 10
SP  - 1
VL  - 77
DO  - 10.1016/j.reactfunctpolym.2014.01.007
ER  - 

@article{
author = "Radovanović, Filip and Nastasović, Aleksandra and Tomković, Tanja and Vasiljević-Radović, Dana and Nešić, Aleksandra and Veličković, Sava and Onjia, Antonije",
year = "2014",
abstract = "Asymmetric polyethersulfone membranes with submicron particles comprising crosslinked glycidyl methacrylate copolymer were prepared by a combination of a traditional immersion precipitation process for making membranes with photopolymerization and crosslinking of functional monomers included in the casting solution. As the concentration of polymerizable monomers increased the original macrovoid structure was replaced by a hybrid morphology with microglobules typical of macroporous methacrylate adsorbers embedded within microporous structure with no significant effects on water permeability. The epoxide groups present in glycidyl methacrylate copolymer were transformed into amine functionalities by ring opening under alkaline conditions. Permeation of Orange G solution at low transmembrane pressures was used to demonstrate suitability of these novel membranes for membrane adsorption.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Reactive & Functional Polymers",
title = "Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate",
pages = "10-1",
volume = "77",
doi = "10.1016/j.reactfunctpolym.2014.01.007"
}

Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S.,& Onjia, A.. (2014). Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. in Reactive & Functional Polymers
Elsevier Science Bv, Amsterdam., 77, 1-10.
https://doi.org/10.1016/j.reactfunctpolym.2014.01.007

Radovanović F, Nastasović A, Tomković T, Vasiljević-Radović D, Nešić A, Veličković S, Onjia A. Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. in Reactive & Functional Polymers. 2014;77:1-10.
doi:10.1016/j.reactfunctpolym.2014.01.007 .

Radovanović, Filip, Nastasović, Aleksandra, Tomković, Tanja, Vasiljević-Radović, Dana, Nešić, Aleksandra, Veličković, Sava, Onjia, Antonije, "Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate" in Reactive & Functional Polymers, 77 (2014):1-10,
https://doi.org/10.1016/j.reactfunctpolym.2014.01.007 . .

TY  - DATA
AU  - Radovanović, Filip
AU  - Nastasović, Aleksandra
AU  - Tomković, Tanja
AU  - Vasiljević-Radović, Dana
AU  - Nešić, Aleksandra
AU  - Veličković, Sava
AU  - Onjia, Antonije
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2577
AB  - Asymmetric polyethersulfone membranes with submicron particles comprising crosslinked glycidyl methacrylate copolymer were prepared by a combination of a traditional immersion precipitation process for making membranes with photopolymerization and crosslinking of functional monomers included in the casting solution. As the concentration of polymerizable monomers increased the original macrovoid structure was replaced by a hybrid morphology with microglobules typical of macroporous methacrylate adsorbers embedded within microporous structure with no significant effects on water permeability. The epoxide groups present in glycidyl methacrylate copolymer were transformed into amine functionalities by ring opening under alkaline conditions. Permeation of Orange G solution at low transmembrane pressures was used to demonstrate suitability of these novel membranes for membrane adsorption.
PB  - Elsevier, Amsterdam
T2  - Reactive & Functional Polymers
T1  - Supplementary materials for the article: Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S., Onjia, A., 2014. Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. Reactive and Functional Polymers 77, 1–10. https://doi.org/10.1016/j.reactfunctpolym.2014.01.007
UR  - https://hdl.handle.net/21.15107/rcub_dais_4728
ER  - 

@misc{
author = "Radovanović, Filip and Nastasović, Aleksandra and Tomković, Tanja and Vasiljević-Radović, Dana and Nešić, Aleksandra and Veličković, Sava and Onjia, Antonije",
year = "2014",
abstract = "Asymmetric polyethersulfone membranes with submicron particles comprising crosslinked glycidyl methacrylate copolymer were prepared by a combination of a traditional immersion precipitation process for making membranes with photopolymerization and crosslinking of functional monomers included in the casting solution. As the concentration of polymerizable monomers increased the original macrovoid structure was replaced by a hybrid morphology with microglobules typical of macroporous methacrylate adsorbers embedded within microporous structure with no significant effects on water permeability. The epoxide groups present in glycidyl methacrylate copolymer were transformed into amine functionalities by ring opening under alkaline conditions. Permeation of Orange G solution at low transmembrane pressures was used to demonstrate suitability of these novel membranes for membrane adsorption.",
publisher = "Elsevier, Amsterdam",
journal = "Reactive & Functional Polymers",
title = "Supplementary materials for the article: Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S., Onjia, A., 2014. Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. Reactive and Functional Polymers 77, 1–10. https://doi.org/10.1016/j.reactfunctpolym.2014.01.007",
url = "https://hdl.handle.net/21.15107/rcub_dais_4728"
}

Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S.,& Onjia, A.. (2014). Supplementary materials for the article: Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S., Onjia, A., 2014. Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. Reactive and Functional Polymers 77, 1–10. https://doi.org/10.1016/j.reactfunctpolym.2014.01.007. in Reactive & Functional Polymers
Elsevier, Amsterdam..
https://hdl.handle.net/21.15107/rcub_dais_4728

Radovanović F, Nastasović A, Tomković T, Vasiljević-Radović D, Nešić A, Veličković S, Onjia A. Supplementary materials for the article: Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S., Onjia, A., 2014. Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. Reactive and Functional Polymers 77, 1–10. https://doi.org/10.1016/j.reactfunctpolym.2014.01.007. in Reactive & Functional Polymers. 2014;.
https://hdl.handle.net/21.15107/rcub_dais_4728 .

Radovanović, Filip, Nastasović, Aleksandra, Tomković, Tanja, Vasiljević-Radović, Dana, Nešić, Aleksandra, Veličković, Sava, Onjia, Antonije, "Supplementary materials for the article: Radovanović, F., Nastasović, A., Tomković, T., Vasiljević-Radović, D., Nešić, A., Veličković, S., Onjia, A., 2014. Novel membrane adsorbers incorporating functionalized polyglycidyl methacrylate. Reactive and Functional Polymers 77, 1–10. https://doi.org/10.1016/j.reactfunctpolym.2014.01.007" in Reactive & Functional Polymers (2014),
https://hdl.handle.net/21.15107/rcub_dais_4728 .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5777
AB  - Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).
PB  - Springer, Dordrecht
T2  - Journal of Polymer Research
T1  - Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch
IS  - 2
SP  - 363
VL  - 21
DO  - 10.1007/s10965-014-0363-1
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2014",
abstract = "Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).",
publisher = "Springer, Dordrecht",
journal = "Journal of Polymer Research",
title = "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch",
number = "2",
pages = "363",
volume = "21",
doi = "10.1007/s10965-014-0363-1"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2014). Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research
Springer, Dordrecht., 21(2), 363.
https://doi.org/10.1007/s10965-014-0363-1

Nikolić V, Veličković S, Popović AR. Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research. 2014;21(2):363.
doi:10.1007/s10965-014-0363-1 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch" in Journal of Polymer Research, 21, no. 2 (2014):363,
https://doi.org/10.1007/s10965-014-0363-1 . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Šešlija, Sanja I.
AU  - Nešić, Aleksandra
AU  - Veličković, Sava
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2311
AB  - The use of polymeric adsorbents for the removal of azo dyes from solution has been reviewed. Adsorption techniques are widely used to remove certain classes of pollutants from waters, especially those which are not easily biodegradable. The removal of azo dyes as pollutants from wastewaters of textile, paper, printing, leather, pharmaceutical and other industries has been addressed by the researchers. The wider use of already available adsorbents is restricted due to their high costs which lead to investigation and development of new materials that can be cheaper, eficient and easy regenerated. The aim of this article is to present to the readers the widespread investigations in recent years of synthetic and natural polymers as adsorbents and potential replacement of conventional adsorbents. This review presents only the data obtained using raw, hydrogel, grafted and crosslinked forms of synthetic and nature based polymers, and the discussion is limited to these polymer-based materials and their adsorption properties.
AB  - Intenzivan industrijski razvoj praćen je sve većom količinom otpadnih voda, što u smislu zaštite životne sredine i održivog razvoja nalaže potrebu poboljšanja postojećih i uvođenje novih postupaka obrade otpadnih voda. Posebnu naučno-tehnološku pažnju zahtevaju azo boje, koje su veoma toksične i u prirodi veoma teško razgradive. Azo boje su podložne bioakumulaciji, a zbog kancerogenih i mutagenih svojstava neretko su pretnja zdravlju ljudi i očuvanju okoline. Primenu fizičko-hemijskih metoda za uklanjanje azo-boja iz otpadnih voda često ograničavaju visoke cene, potrebe za odlaganjem nastalog štetnog mulja ili nastanak toksičnih sastojaka razgradnje. Adsorpcija je jedna od najzastupljenijih metoda za uklanjanje raznih zagađivača iz otpadnih voda zbog jednostavnosti, ekonomičnosti i efikasnosti ove metode. S obzirom da su konvencionalni adsorbenti, kao što je aktivni ugalj, veoma skupi, u poslednje vreme se sve više ulaže u ispitivanja i razvoj novih materijala za uklanjanje zagadjivača iz otpadnih voda koji će biti lako razgradivi, netoksični, jeftini i efikasni u njihovom uklanjanju. U ovom radu biće prikazan pregled iz literature polimernih materijala za uklanjanje azo boja iz otpadnih voda. Polimerni materijali pokazuju prednosti u odnosu na konvencio-nalne adsrobente zbog jednostavne upotrebe i rukovanja s njima i mogućnosti oblikovanja u pogodne i željene forme. Adsorpcija na polimernim materijalima je najčešće reverzibilan proces, što nije slučaj kod konvencionalnih adsorbenta. Adsorbovana boja na polimernim materijalima, u zavisnosti od tipa boje, se lako može desorbovati u kiseloj ili alkalnoj sredini, kao i u acetonu, tako da se materijal može regenerisati i ponovo koristiti za uklanjanje boja iz otpadnih voda. U ovom radu će biti prikazani sintetički i prirodni polimeri u formi hidrogela, umreženih i kalemljenih sistema za uklanjanje azo boja. Takodje, prikazan je efekat različitih parametara kao što su koncentracija, pH i temperatura rastvora boje, na adsorpciju na polimernim materijalima.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Adsorption of azo dyes on polymer materials
T1  - Adsorpcija azo boja na polimernim materijalima
EP  - 900
IS  - 6
SP  - 881
VL  - 67
DO  - 10.2298/HEMIND121203020P
ER  - 

@article{
author = "Panić, Vesna and Šešlija, Sanja I. and Nešić, Aleksandra and Veličković, Sava",
year = "2013",
abstract = "The use of polymeric adsorbents for the removal of azo dyes from solution has been reviewed. Adsorption techniques are widely used to remove certain classes of pollutants from waters, especially those which are not easily biodegradable. The removal of azo dyes as pollutants from wastewaters of textile, paper, printing, leather, pharmaceutical and other industries has been addressed by the researchers. The wider use of already available adsorbents is restricted due to their high costs which lead to investigation and development of new materials that can be cheaper, eficient and easy regenerated. The aim of this article is to present to the readers the widespread investigations in recent years of synthetic and natural polymers as adsorbents and potential replacement of conventional adsorbents. This review presents only the data obtained using raw, hydrogel, grafted and crosslinked forms of synthetic and nature based polymers, and the discussion is limited to these polymer-based materials and their adsorption properties., Intenzivan industrijski razvoj praćen je sve većom količinom otpadnih voda, što u smislu zaštite životne sredine i održivog razvoja nalaže potrebu poboljšanja postojećih i uvođenje novih postupaka obrade otpadnih voda. Posebnu naučno-tehnološku pažnju zahtevaju azo boje, koje su veoma toksične i u prirodi veoma teško razgradive. Azo boje su podložne bioakumulaciji, a zbog kancerogenih i mutagenih svojstava neretko su pretnja zdravlju ljudi i očuvanju okoline. Primenu fizičko-hemijskih metoda za uklanjanje azo-boja iz otpadnih voda često ograničavaju visoke cene, potrebe za odlaganjem nastalog štetnog mulja ili nastanak toksičnih sastojaka razgradnje. Adsorpcija je jedna od najzastupljenijih metoda za uklanjanje raznih zagađivača iz otpadnih voda zbog jednostavnosti, ekonomičnosti i efikasnosti ove metode. S obzirom da su konvencionalni adsorbenti, kao što je aktivni ugalj, veoma skupi, u poslednje vreme se sve više ulaže u ispitivanja i razvoj novih materijala za uklanjanje zagadjivača iz otpadnih voda koji će biti lako razgradivi, netoksični, jeftini i efikasni u njihovom uklanjanju. U ovom radu biće prikazan pregled iz literature polimernih materijala za uklanjanje azo boja iz otpadnih voda. Polimerni materijali pokazuju prednosti u odnosu na konvencio-nalne adsrobente zbog jednostavne upotrebe i rukovanja s njima i mogućnosti oblikovanja u pogodne i željene forme. Adsorpcija na polimernim materijalima je najčešće reverzibilan proces, što nije slučaj kod konvencionalnih adsorbenta. Adsorbovana boja na polimernim materijalima, u zavisnosti od tipa boje, se lako može desorbovati u kiseloj ili alkalnoj sredini, kao i u acetonu, tako da se materijal može regenerisati i ponovo koristiti za uklanjanje boja iz otpadnih voda. U ovom radu će biti prikazani sintetički i prirodni polimeri u formi hidrogela, umreženih i kalemljenih sistema za uklanjanje azo boja. Takodje, prikazan je efekat različitih parametara kao što su koncentracija, pH i temperatura rastvora boje, na adsorpciju na polimernim materijalima.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Adsorption of azo dyes on polymer materials, Adsorpcija azo boja na polimernim materijalima",
pages = "900-881",
number = "6",
volume = "67",
doi = "10.2298/HEMIND121203020P"
}

Panić, V., Šešlija, S. I., Nešić, A.,& Veličković, S.. (2013). Adsorption of azo dyes on polymer materials. in Hemijska industrija
Association of Chemical Engineers of Serbia., 67(6), 881-900.
https://doi.org/10.2298/HEMIND121203020P

Panić V, Šešlija SI, Nešić A, Veličković S. Adsorption of azo dyes on polymer materials. in Hemijska industrija. 2013;67(6):881-900.
doi:10.2298/HEMIND121203020P .

Panić, Vesna, Šešlija, Sanja I., Nešić, Aleksandra, Veličković, Sava, "Adsorption of azo dyes on polymer materials" in Hemijska industrija, 67, no. 6 (2013):881-900,
https://doi.org/10.2298/HEMIND121203020P . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Madžarević, Zeljka P.
AU  - Volkov-Husović, Tatjana
AU  - Veličković, Sava
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2523
AB  - Poly(methacrylic acid) based hydrogels with neutralization degree of monomer of 0% (PMAA/0) and 80% (PMAA/80) were synthesized and their sorption potentials toward model cationic dye, basic yellow 28 (BY28), from aqueous solution, were investigated. FTIR and SEM analysis were conducted to confirm the structure and morphology of the sorbents. Investigation of the effect of the initial dye concentration, the solution pH, the sorbent mass and the temperature on sorption process, as well as the sorption kinetics and equilibrium studies were performed by batch technique. Sorption capacities of both sorbents showed to be highly sensitive to external conditions change, especially those affecting hydrogel swelling degree. Kinetic studies showed that the pseudo-first order kinetic model well fitted the experimental data and that sorption of BY28 onto PMAA hydrogels could be very well described with phase-boundary controlled models. Thermodynamical data revealed spontaneous endothermic processes. In case of PMAA/0 hydrogel physisorption was dominant, while in case of PMAA/80 hydrogel, both, the physisorption and chemisorption were presented. Langmuir, Freundlich and Dubinin-Radushkevich sorption isotherms were applied on equilibrium sorption data. The saturated sorption amount could reach up to 102 mg g(-1) and 157 mg g(-1) for PMAA/0 and PMAA/80 hydrogel, respectively. Image analysis proved to be useful method for analysis of uniformity of coloration along the hydrogel diameter. Both hydrogels displayed good properties in cationic dye removal, but higher sorption capacities, percentage of removed dye and significant acceleration of sorption of BY28 were accomplished by neutralizing the monomer up to 80%.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - Poly(methacrylic acid) based hydrogels as sorbents for removal of cationic dye basic yellow 28: Kinetics, equilibrium study and image analysis
EP  - 204
SP  - 192
VL  - 217
DO  - 10.1016/j.cej.2012.11.081
ER  - 

@article{
author = "Panić, Vesna and Madžarević, Zeljka P. and Volkov-Husović, Tatjana and Veličković, Sava",
year = "2013",
abstract = "Poly(methacrylic acid) based hydrogels with neutralization degree of monomer of 0% (PMAA/0) and 80% (PMAA/80) were synthesized and their sorption potentials toward model cationic dye, basic yellow 28 (BY28), from aqueous solution, were investigated. FTIR and SEM analysis were conducted to confirm the structure and morphology of the sorbents. Investigation of the effect of the initial dye concentration, the solution pH, the sorbent mass and the temperature on sorption process, as well as the sorption kinetics and equilibrium studies were performed by batch technique. Sorption capacities of both sorbents showed to be highly sensitive to external conditions change, especially those affecting hydrogel swelling degree. Kinetic studies showed that the pseudo-first order kinetic model well fitted the experimental data and that sorption of BY28 onto PMAA hydrogels could be very well described with phase-boundary controlled models. Thermodynamical data revealed spontaneous endothermic processes. In case of PMAA/0 hydrogel physisorption was dominant, while in case of PMAA/80 hydrogel, both, the physisorption and chemisorption were presented. Langmuir, Freundlich and Dubinin-Radushkevich sorption isotherms were applied on equilibrium sorption data. The saturated sorption amount could reach up to 102 mg g(-1) and 157 mg g(-1) for PMAA/0 and PMAA/80 hydrogel, respectively. Image analysis proved to be useful method for analysis of uniformity of coloration along the hydrogel diameter. Both hydrogels displayed good properties in cationic dye removal, but higher sorption capacities, percentage of removed dye and significant acceleration of sorption of BY28 were accomplished by neutralizing the monomer up to 80%.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "Poly(methacrylic acid) based hydrogels as sorbents for removal of cationic dye basic yellow 28: Kinetics, equilibrium study and image analysis",
pages = "204-192",
volume = "217",
doi = "10.1016/j.cej.2012.11.081"
}

Panić, V., Madžarević, Z. P., Volkov-Husović, T.,& Veličković, S.. (2013). Poly(methacrylic acid) based hydrogels as sorbents for removal of cationic dye basic yellow 28: Kinetics, equilibrium study and image analysis. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 217, 192-204.
https://doi.org/10.1016/j.cej.2012.11.081

Panić V, Madžarević ZP, Volkov-Husović T, Veličković S. Poly(methacrylic acid) based hydrogels as sorbents for removal of cationic dye basic yellow 28: Kinetics, equilibrium study and image analysis. in Chemical Engineering Journal. 2013;217:192-204.
doi:10.1016/j.cej.2012.11.081 .

Panić, Vesna, Madžarević, Zeljka P., Volkov-Husović, Tatjana, Veličković, Sava, "Poly(methacrylic acid) based hydrogels as sorbents for removal of cationic dye basic yellow 28: Kinetics, equilibrium study and image analysis" in Chemical Engineering Journal, 217 (2013):192-204,
https://doi.org/10.1016/j.cej.2012.11.081 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Antonović, Dušan G.
AU  - Popović, Aleksandar R.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5678
AB  - In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established.
AB  - U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water
T1  - Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi
EP  - 1441
IS  - 9
SP  - 1425
VL  - 78
DO  - 10.2298/JSC121216051N
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Antonović, Dušan G. and Popović, Aleksandar R.",
year = "2013",
abstract = "In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established., U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water, Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi",
pages = "1441-1425",
number = "9",
volume = "78",
doi = "10.2298/JSC121216051N"
}

Nikolić, V., Veličković, S., Antonović, D. G.,& Popović, A. R.. (2013). Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 78(9), 1425-1441.
https://doi.org/10.2298/JSC121216051N

Nikolić V, Veličković S, Antonović DG, Popović AR. Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society. 2013;78(9):1425-1441.
doi:10.2298/JSC121216051N .

Nikolić, Vladimir, Veličković, Sava, Antonović, Dušan G., Popović, Aleksandar R., "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water" in Journal of the Serbian Chemical Society, 78, no. 9 (2013):1425-1441,
https://doi.org/10.2298/JSC121216051N . .

TY  - CONF
AU  - Radovanović, Filip
AU  - Tomković, Tanja
AU  - Nastasović, Aleksandra
AU  - Veličković, Sava
AU  - Nešić, Aleksandra
AU  - Onjia, Antonije
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2286
AB  - Polyethersulfone (PES) is frequently used for high-performance ultrafiltration membranes. Functionalization of PES membranes is required to introduce new groups for specific applications, such as affinity membranes for bioseparations [1]. Functionalization methods include bulk modification of PES material, blending of PES with another material, or surface modification of PES membranes [2]. In this work a novel method for introducing functional groups in asymmetric PES membranes is presented [3]. A cast film comprising PES, glycidyl methacrylate (GMA) and a common solvent was exposed to UV irradiation to form a gel of crosslinked polyGMA. The gel was then immersed in a water bath to create an asymmetric membrane with crosslinked polyGMA particles, as shown in Fig. 1. A simple treatment of these membranes with diethylene triamine was used to open the epoxide rings in polyGMA particles and introduce amine functional groups. The effects of monomer concentrations on the properties and separation performance of these novel membrane adsorbers will be presented.
PB  - Belgrade : Serbian Chemical Society
C3  - 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC
T1  - Asymmetric polyethersulfone membranes with crosslinked poly(glycidyl methacrylate) particles
EP  - 128
SP  - 128
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7534
ER  - 

@conference{
author = "Radovanović, Filip and Tomković, Tanja and Nastasović, Aleksandra and Veličković, Sava and Nešić, Aleksandra and Onjia, Antonije",
year = "2013",
abstract = "Polyethersulfone (PES) is frequently used for high-performance ultrafiltration membranes. Functionalization of PES membranes is required to introduce new groups for specific applications, such as affinity membranes for bioseparations [1]. Functionalization methods include bulk modification of PES material, blending of PES with another material, or surface modification of PES membranes [2]. In this work a novel method for introducing functional groups in asymmetric PES membranes is presented [3]. A cast film comprising PES, glycidyl methacrylate (GMA) and a common solvent was exposed to UV irradiation to form a gel of crosslinked polyGMA. The gel was then immersed in a water bath to create an asymmetric membrane with crosslinked polyGMA particles, as shown in Fig. 1. A simple treatment of these membranes with diethylene triamine was used to open the epoxide rings in polyGMA particles and introduce amine functional groups. The effects of monomer concentrations on the properties and separation performance of these novel membrane adsorbers will be presented.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC",
title = "Asymmetric polyethersulfone membranes with crosslinked poly(glycidyl methacrylate) particles",
pages = "128-128",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7534"
}

Radovanović, F., Tomković, T., Nastasović, A., Veličković, S., Nešić, A.,& Onjia, A.. (2013). Asymmetric polyethersulfone membranes with crosslinked poly(glycidyl methacrylate) particles. in 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC
Belgrade : Serbian Chemical Society., 128-128.
https://hdl.handle.net/21.15107/rcub_vinar_7534

Radovanović F, Tomković T, Nastasović A, Veličković S, Nešić A, Onjia A. Asymmetric polyethersulfone membranes with crosslinked poly(glycidyl methacrylate) particles. in 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC. 2013;:128-128.
https://hdl.handle.net/21.15107/rcub_vinar_7534 .

Radovanović, Filip, Tomković, Tanja, Nastasović, Aleksandra, Veličković, Sava, Nešić, Aleksandra, Onjia, Antonije, "Asymmetric polyethersulfone membranes with crosslinked poly(glycidyl methacrylate) particles" in 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC (2013):128-128,
https://hdl.handle.net/21.15107/rcub_vinar_7534 .

TY  - CONF
AU  - Radovanović, Filip
AU  - Tomković, Tanja
AU  - Nastasović, Aleksandra
AU  - Veličković, Sava
AU  - Nešić, Aleksandra
AU  - Onjia, Antonije
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2285
AB  - Ultrafiltration (UF) membranes are currently used in industry for the concentration of proteins and other macromolecules. Performance of UF membranes is generally limited by a trade-off between permeability and selectivity [1]. However, electrically-charged ultrafiltration membranes can provide a dramatic improvement in ultrafiltration performance [2]. Novel UF membranes were made by combining traditional immersion precipitation process for making membranes with photopolymerization of the casting solution comprising polyethersulfone, glycidyl methacrylate and other reactive monomers. Negative charges were introduced either by initially using 2-acrylamido-2-methylpropane sulfonic acid as a reactive monomer, or were later created by epoxide ring opening of crosslinked glycidyl methacrylate. As shown in Fig. 1, selectivity of these membranes significantly improved as the concentration of negatively-charged groups in the membrane increased. The effects of membrane composition on the properties and separation performance of these novel UF membranes will be presented.
PB  - Belgrade : Serbian Chemical Society
C3  - 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC
T1  - Novel negatively-charged ultrafiltration membranes made by a combination of immersion precipitation and photopolymerization
EP  - 131
SP  - 131
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7535
ER  - 

@conference{
author = "Radovanović, Filip and Tomković, Tanja and Nastasović, Aleksandra and Veličković, Sava and Nešić, Aleksandra and Onjia, Antonije",
year = "2013",
abstract = "Ultrafiltration (UF) membranes are currently used in industry for the concentration of proteins and other macromolecules. Performance of UF membranes is generally limited by a trade-off between permeability and selectivity [1]. However, electrically-charged ultrafiltration membranes can provide a dramatic improvement in ultrafiltration performance [2]. Novel UF membranes were made by combining traditional immersion precipitation process for making membranes with photopolymerization of the casting solution comprising polyethersulfone, glycidyl methacrylate and other reactive monomers. Negative charges were introduced either by initially using 2-acrylamido-2-methylpropane sulfonic acid as a reactive monomer, or were later created by epoxide ring opening of crosslinked glycidyl methacrylate. As shown in Fig. 1, selectivity of these membranes significantly improved as the concentration of negatively-charged groups in the membrane increased. The effects of membrane composition on the properties and separation performance of these novel UF membranes will be presented.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC",
title = "Novel negatively-charged ultrafiltration membranes made by a combination of immersion precipitation and photopolymerization",
pages = "131-131",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7535"
}

Radovanović, F., Tomković, T., Nastasović, A., Veličković, S., Nešić, A.,& Onjia, A.. (2013). Novel negatively-charged ultrafiltration membranes made by a combination of immersion precipitation and photopolymerization. in 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC
Belgrade : Serbian Chemical Society., 131-131.
https://hdl.handle.net/21.15107/rcub_vinar_7535

Radovanović F, Tomković T, Nastasović A, Veličković S, Nešić A, Onjia A. Novel negatively-charged ultrafiltration membranes made by a combination of immersion precipitation and photopolymerization. in 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC. 2013;:131-131.
https://hdl.handle.net/21.15107/rcub_vinar_7535 .

Radovanović, Filip, Tomković, Tanja, Nastasović, Aleksandra, Veličković, Sava, Nešić, Aleksandra, Onjia, Antonije, "Novel negatively-charged ultrafiltration membranes made by a combination of immersion precipitation and photopolymerization" in 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSEC (2013):131-131,
https://hdl.handle.net/21.15107/rcub_vinar_7535 .

TY  - JOUR
AU  - Spasojević, Pavle
AU  - Stamenković, Dragoslav
AU  - Pjanović, Rada
AU  - Bošković-Vragolović, Nevenka
AU  - Dolić, Jelena
AU  - Grujić, Svetlana
AU  - Veličković, Sava
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2144
AB  - This study evaluated the water absorption, solubility, kinetics of water diffusion and residual monomer content of commercial poly(methyl methacrylate) (PMMA) denture base material modified with dimethyl itaconate (DMI) and di-n-butyl itaconate (DBI). Water absorption and solubility were measured gravimetrically while the residual monomer content was analysed using high-performance liquid chromatography with ultraviolet detection. It was found that the addition of di-n-alkyl itaconates significantly decreases the residual methyl methacrylate (MMA) content in the polymerized material. Maximum uptake (M8) and loss (M'8), and diffusion coefficients for absorption (Da) and desorption (Dd) of water through all materials were established. M8 shows a linear decrease with increasing amount of itaconate in the system while Da shows a linear increase with increasing amount of itaconate, both of these effects being more pronounced when DBI is present compared to DMI. M8 is a linear function of the value of Hoy's solubility parameter. The reduction in residual MMA promoted by addition of a small amount of di-n-alkyl itaconates can improve the applicative properties and biocompatibility of the PMMA denture base material. Also, it is shown that modification of the denture base material with di-n-alkyl itaconates can enable precise control of water absorption in the system.
PB  - Wiley-Blackwell, Hoboken
T2  - Polymer International
T1  - Diffusion and solubility of commercial poly(methyl methacrylate) denture base material modified with dimethyl itaconate and di-n-butyl itaconate during water absorption/desorption cycles
EP  - 1278
IS  - 8
SP  - 1272
VL  - 61
DO  - 10.1002/pi.4202
ER  - 

@article{
author = "Spasojević, Pavle and Stamenković, Dragoslav and Pjanović, Rada and Bošković-Vragolović, Nevenka and Dolić, Jelena and Grujić, Svetlana and Veličković, Sava",
year = "2012",
abstract = "This study evaluated the water absorption, solubility, kinetics of water diffusion and residual monomer content of commercial poly(methyl methacrylate) (PMMA) denture base material modified with dimethyl itaconate (DMI) and di-n-butyl itaconate (DBI). Water absorption and solubility were measured gravimetrically while the residual monomer content was analysed using high-performance liquid chromatography with ultraviolet detection. It was found that the addition of di-n-alkyl itaconates significantly decreases the residual methyl methacrylate (MMA) content in the polymerized material. Maximum uptake (M8) and loss (M'8), and diffusion coefficients for absorption (Da) and desorption (Dd) of water through all materials were established. M8 shows a linear decrease with increasing amount of itaconate in the system while Da shows a linear increase with increasing amount of itaconate, both of these effects being more pronounced when DBI is present compared to DMI. M8 is a linear function of the value of Hoy's solubility parameter. The reduction in residual MMA promoted by addition of a small amount of di-n-alkyl itaconates can improve the applicative properties and biocompatibility of the PMMA denture base material. Also, it is shown that modification of the denture base material with di-n-alkyl itaconates can enable precise control of water absorption in the system.",
publisher = "Wiley-Blackwell, Hoboken",
journal = "Polymer International",
title = "Diffusion and solubility of commercial poly(methyl methacrylate) denture base material modified with dimethyl itaconate and di-n-butyl itaconate during water absorption/desorption cycles",
pages = "1278-1272",
number = "8",
volume = "61",
doi = "10.1002/pi.4202"
}

Spasojević, P., Stamenković, D., Pjanović, R., Bošković-Vragolović, N., Dolić, J., Grujić, S.,& Veličković, S.. (2012). Diffusion and solubility of commercial poly(methyl methacrylate) denture base material modified with dimethyl itaconate and di-n-butyl itaconate during water absorption/desorption cycles. in Polymer International
Wiley-Blackwell, Hoboken., 61(8), 1272-1278.
https://doi.org/10.1002/pi.4202

Spasojević P, Stamenković D, Pjanović R, Bošković-Vragolović N, Dolić J, Grujić S, Veličković S. Diffusion and solubility of commercial poly(methyl methacrylate) denture base material modified with dimethyl itaconate and di-n-butyl itaconate during water absorption/desorption cycles. in Polymer International. 2012;61(8):1272-1278.
doi:10.1002/pi.4202 .

Spasojević, Pavle, Stamenković, Dragoslav, Pjanović, Rada, Bošković-Vragolović, Nevenka, Dolić, Jelena, Grujić, Svetlana, Veličković, Sava, "Diffusion and solubility of commercial poly(methyl methacrylate) denture base material modified with dimethyl itaconate and di-n-butyl itaconate during water absorption/desorption cycles" in Polymer International, 61, no. 8 (2012):1272-1278,
https://doi.org/10.1002/pi.4202 . .