TY  - CONF
AU  - Nikolić, Nikolina
AU  - Spasojević, Jelena
AU  - Stamenović, Una
AU  - Vukoje, Ivana
AU  - Tadić, Julijana
AU  - Vodnik, Vesna
AU  - Kačarević-Popović, Zorica
AU  - Radosavljević, Aleksandra
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12226
PB  - Niš : RAD Centre
C3  - RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts
T1  - Gamma irradiation-induced synthesis and characterization of bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposites
SP  - 85
EP  - 85
DO  - 10.21175/rad.abstr.book.2023.19.6
ER  - 

@conference{
author = "Nikolić, Nikolina and Spasojević, Jelena and Stamenović, Una and Vukoje, Ivana and Tadić, Julijana and Vodnik, Vesna and Kačarević-Popović, Zorica and Radosavljević, Aleksandra",
year = "2023",
publisher = "Niš : RAD Centre",
journal = "RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts",
title = "Gamma irradiation-induced synthesis and characterization of bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposites",
pages = "85-85",
doi = "10.21175/rad.abstr.book.2023.19.6"
}

Nikolić, N., Spasojević, J., Stamenović, U., Vukoje, I., Tadić, J., Vodnik, V., Kačarević-Popović, Z.,& Radosavljević, A.. (2023). Gamma irradiation-induced synthesis and characterization of bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposites. in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts
Niš : RAD Centre., 85-85.
https://doi.org/10.21175/rad.abstr.book.2023.19.6

Nikolić N, Spasojević J, Stamenović U, Vukoje I, Tadić J, Vodnik V, Kačarević-Popović Z, Radosavljević A. Gamma irradiation-induced synthesis and characterization of bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposites. in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts. 2023;:85-85.
doi:10.21175/rad.abstr.book.2023.19.6 .

Nikolić, Nikolina, Spasojević, Jelena, Stamenović, Una, Vukoje, Ivana, Tadić, Julijana, Vodnik, Vesna, Kačarević-Popović, Zorica, Radosavljević, Aleksandra, "Gamma irradiation-induced synthesis and characterization of bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposites" in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts (2023):85-85,
https://doi.org/10.21175/rad.abstr.book.2023.19.6 . .

TY  - CONF
AU  - Nikolić, Nikolina
AU  - Spasojević, Jelena
AU  - Stamenović, Una
AU  - Vodnik, Vesna
AU  - Vukoje, Ivana
AU  - Kačarević-Popović, Zorica
AU  - Radosavljević, Aleksandra
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12325
AB  - In recent years, the need for innovative materials has produced remarkable progress in the field of smart materials, with a particular focus on nanocomposite systems containing crosslinked polymer matrices (hydrogels) and metal nanoparticles. Hydrogels have become a crucial class of biomaterials due to their stable 3D porous structures, high fluid absorption capacity, similarity to biological tissues, and biocompatibility. Of particular interest are hydrogels with the ability to respond to various external stimuli (temperature, pH, light etc.), resulting in alterations of their physical and chemical characteristics. Our research focuses on the nanocomposites based on thermosensitive poly(N-isopropylacrylamide) (PNiPAAm) hydrogels and gold nanoparticles (AuNPs), with a unique emphasis on exploring the specific properties of single-layer and bi-layered systems. The insights gained from this comparative study open new possibilities for applications in drug delivery, sensors, and soft robotics. Single-layer systems consisting of active PNiPAAm hydrogel and AuNPs, were created through a combination of radiolytic and chemical procedures. Bi-layered systems feature an active Au-PNiPAAm layer, with the addition of a passive poly(vinyl alcohol) (PVA) hydrogel layer, crosslinked by the combination of freeze-thaw and radiolytic techniques. In both cases, the incorporation of spherical AuNPs within an active layer was confirmed by the presence of a characteristic surface plasmon resonance (SPR), while scanning electron microscopy (SEM) indicated the system's highly porous structure. The physicochemical properties of both single- and bi-layered systems involved the examination of their swelling and deswelling properties, as well as the volume phase transition temperature (VPTT). The incorporation of AuNPs in the PNiPAAm layer led to an increase in both swelling capacity and VPTT. Compression measurements showed that the presence of a passive layer and AuNPs significantly improved mechanical properties of nanocomposites.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Improvement of Au-poly(N-isopropylacrylamide) hydrogel nanocomposites: Singlelayer vs. bi-layered systems
SP  - 54
EP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12325
ER  - 

@conference{
author = "Nikolić, Nikolina and Spasojević, Jelena and Stamenović, Una and Vodnik, Vesna and Vukoje, Ivana and Kačarević-Popović, Zorica and Radosavljević, Aleksandra",
year = "2023",
abstract = "In recent years, the need for innovative materials has produced remarkable progress in the field of smart materials, with a particular focus on nanocomposite systems containing crosslinked polymer matrices (hydrogels) and metal nanoparticles. Hydrogels have become a crucial class of biomaterials due to their stable 3D porous structures, high fluid absorption capacity, similarity to biological tissues, and biocompatibility. Of particular interest are hydrogels with the ability to respond to various external stimuli (temperature, pH, light etc.), resulting in alterations of their physical and chemical characteristics. Our research focuses on the nanocomposites based on thermosensitive poly(N-isopropylacrylamide) (PNiPAAm) hydrogels and gold nanoparticles (AuNPs), with a unique emphasis on exploring the specific properties of single-layer and bi-layered systems. The insights gained from this comparative study open new possibilities for applications in drug delivery, sensors, and soft robotics. Single-layer systems consisting of active PNiPAAm hydrogel and AuNPs, were created through a combination of radiolytic and chemical procedures. Bi-layered systems feature an active Au-PNiPAAm layer, with the addition of a passive poly(vinyl alcohol) (PVA) hydrogel layer, crosslinked by the combination of freeze-thaw and radiolytic techniques. In both cases, the incorporation of spherical AuNPs within an active layer was confirmed by the presence of a characteristic surface plasmon resonance (SPR), while scanning electron microscopy (SEM) indicated the system's highly porous structure. The physicochemical properties of both single- and bi-layered systems involved the examination of their swelling and deswelling properties, as well as the volume phase transition temperature (VPTT). The incorporation of AuNPs in the PNiPAAm layer led to an increase in both swelling capacity and VPTT. Compression measurements showed that the presence of a passive layer and AuNPs significantly improved mechanical properties of nanocomposites.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Improvement of Au-poly(N-isopropylacrylamide) hydrogel nanocomposites: Singlelayer vs. bi-layered systems",
pages = "54-54",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12325"
}

Nikolić, N., Spasojević, J., Stamenović, U., Vodnik, V., Vukoje, I., Kačarević-Popović, Z.,& Radosavljević, A.. (2023). Improvement of Au-poly(N-isopropylacrylamide) hydrogel nanocomposites: Singlelayer vs. bi-layered systems. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 54-54.
https://hdl.handle.net/21.15107/rcub_vinar_12325

Nikolić N, Spasojević J, Stamenović U, Vodnik V, Vukoje I, Kačarević-Popović Z, Radosavljević A. Improvement of Au-poly(N-isopropylacrylamide) hydrogel nanocomposites: Singlelayer vs. bi-layered systems. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:54-54.
https://hdl.handle.net/21.15107/rcub_vinar_12325 .

Nikolić, Nikolina, Spasojević, Jelena, Stamenović, Una, Vodnik, Vesna, Vukoje, Ivana, Kačarević-Popović, Zorica, Radosavljević, Aleksandra, "Improvement of Au-poly(N-isopropylacrylamide) hydrogel nanocomposites: Singlelayer vs. bi-layered systems" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):54-54,
https://hdl.handle.net/21.15107/rcub_vinar_12325 .

TY  - JOUR
AU  - Nikolić, Nikolina
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Milošević, Milica V.
AU  - Barudžija, Tanja
AU  - Rakočević, Lazar
AU  - Kačarević-Popović, Zorica M.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10449
AB  - A series of silver nanoparticles (AgNPs)-poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) (PVA/PVP) hydrogel nanocomposites were synthesized by gamma irradiation to examine the matrix's impact on properties of Ag nanocrystals important for strain engineering in functional materials. SEM analysis and the swelling studies revealed nanocomposite morphology and fluid transport properties. UV–Vis absorption characterization of AgNPs has enabled an understanding of the cluster size effects. The gel content indicated inter-crosslinking of the two components of the polymer matrix, especially for equivalent (1:1) PVA/PVP ratio, affecting the investigated AgNPs structural parameters. The lattice parameters and the interface stress, analyzed using XRD, have the lowest negative magnitude from the bulk lattice constant for the PVA/PVP (2:1) and (1:1) ratio. The lowest values of the lattice strain and dislocation density, as mutually dependent parameters, are obtained in AgNPs embedded in a PVA/PVP (2:1) and (1:1) matrix. The XPS and FTIR data show a positive shift of the O1s and a redshift of the CO – Ag vibration band indicating charge transfer to the vacant orbital of Ag nanocrystals. The N atoms of the pyrrolidine ring are not directly involved in the electronic interactions, but over the p-π conjugation with carbonyl O. In addition, the tested Ag-(PVA/PVP) hydrogel nanocomposites showed significant potential as a broad-spectrum antibacterial material.
T2  - Radiation Physics and Chemistry
T1  - Influence of poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) polymer matrix composition on the bonding environment and characteristics of Ag nanoparticles produced by gamma irradiation
VL  - 202
SP  - 110564
DO  - 10.1016/j.radphyschem.2022.110564
ER  - 

@article{
author = "Nikolić, Nikolina and Spasojević, Jelena P. and Radosavljević, Aleksandra and Milošević, Milica V. and Barudžija, Tanja and Rakočević, Lazar and Kačarević-Popović, Zorica M.",
year = "2023",
abstract = "A series of silver nanoparticles (AgNPs)-poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) (PVA/PVP) hydrogel nanocomposites were synthesized by gamma irradiation to examine the matrix's impact on properties of Ag nanocrystals important for strain engineering in functional materials. SEM analysis and the swelling studies revealed nanocomposite morphology and fluid transport properties. UV–Vis absorption characterization of AgNPs has enabled an understanding of the cluster size effects. The gel content indicated inter-crosslinking of the two components of the polymer matrix, especially for equivalent (1:1) PVA/PVP ratio, affecting the investigated AgNPs structural parameters. The lattice parameters and the interface stress, analyzed using XRD, have the lowest negative magnitude from the bulk lattice constant for the PVA/PVP (2:1) and (1:1) ratio. The lowest values of the lattice strain and dislocation density, as mutually dependent parameters, are obtained in AgNPs embedded in a PVA/PVP (2:1) and (1:1) matrix. The XPS and FTIR data show a positive shift of the O1s and a redshift of the CO – Ag vibration band indicating charge transfer to the vacant orbital of Ag nanocrystals. The N atoms of the pyrrolidine ring are not directly involved in the electronic interactions, but over the p-π conjugation with carbonyl O. In addition, the tested Ag-(PVA/PVP) hydrogel nanocomposites showed significant potential as a broad-spectrum antibacterial material.",
journal = "Radiation Physics and Chemistry",
title = "Influence of poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) polymer matrix composition on the bonding environment and characteristics of Ag nanoparticles produced by gamma irradiation",
volume = "202",
pages = "110564",
doi = "10.1016/j.radphyschem.2022.110564"
}

Nikolić, N., Spasojević, J. P., Radosavljević, A., Milošević, M. V., Barudžija, T., Rakočević, L.,& Kačarević-Popović, Z. M.. (2023). Influence of poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) polymer matrix composition on the bonding environment and characteristics of Ag nanoparticles produced by gamma irradiation. in Radiation Physics and Chemistry, 202, 110564.
https://doi.org/10.1016/j.radphyschem.2022.110564

Nikolić N, Spasojević JP, Radosavljević A, Milošević MV, Barudžija T, Rakočević L, Kačarević-Popović ZM. Influence of poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) polymer matrix composition on the bonding environment and characteristics of Ag nanoparticles produced by gamma irradiation. in Radiation Physics and Chemistry. 2023;202:110564.
doi:10.1016/j.radphyschem.2022.110564 .

Nikolić, Nikolina, Spasojević, Jelena P., Radosavljević, Aleksandra, Milošević, Milica V., Barudžija, Tanja, Rakočević, Lazar, Kačarević-Popović, Zorica M., "Influence of poly(vinyl alcohol)/poly(N-vinyl-2-pyrrolidone) polymer matrix composition on the bonding environment and characteristics of Ag nanoparticles produced by gamma irradiation" in Radiation Physics and Chemistry, 202 (2023):110564,
https://doi.org/10.1016/j.radphyschem.2022.110564 . .

TY  - JOUR
AU  - Krstić, Jelena
AU  - Radosavljević, Aleksandra
AU  - Spasojević, Jelena P.
AU  - Nikolić, Nikolina
AU  - Jovanović, Uroš D.
AU  - Abazović, Nadica
AU  - Kačarević-Popović, Zorica M.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10183
AB  - Hydrogels consisting of radiation-degraded chitosan, poly(vinyl alcohol), and Ag nano-filler, were prepared by γ-irradiation in two-stage and single-stage procedures to examine the role of the synthesis procedure in improving the antibacterial activity. The light scattering method showed that radiation-degradation of chitosan occurred both by breaking the glucoside bonds and by Maillard's reaction. Elemental analysis indicated a reduction in the degree of deacetylation after degradation. The product of Amadori rearrangement and pigmented product melanoidins were determined by 1H NMR, FTIR, UV–Vis, and fluorescence spectroscopy. Enhancement of in vitro antibacterial activity of nanocomposites against Staphylococcus aureus and Escherichia coli was achieved by a single-stage procedure which results in greater mobility of radiation-modified chitosan in the network. This allows the exploitation of its potential, which is reflected in the possibility of the complexing of ultrasmall molecular Ag clusters. These complexes have a considerably stronger antibacterial effect. Ag in molecular form was confirmed by XPS analysis.
T2  - Radiation Physics and Chemistry
T1  - Improvement of antibacterial activity of Ag-poly(vinyl-alcohol)/chitosan hydrogel by optimizing the procedure of radiolytic synthesis
VL  - 194
SP  - 110045
DO  - 10.1016/j.radphyschem.2022.110045
ER  - 

@article{
author = "Krstić, Jelena and Radosavljević, Aleksandra and Spasojević, Jelena P. and Nikolić, Nikolina and Jovanović, Uroš D. and Abazović, Nadica and Kačarević-Popović, Zorica M.",
year = "2022",
abstract = "Hydrogels consisting of radiation-degraded chitosan, poly(vinyl alcohol), and Ag nano-filler, were prepared by γ-irradiation in two-stage and single-stage procedures to examine the role of the synthesis procedure in improving the antibacterial activity. The light scattering method showed that radiation-degradation of chitosan occurred both by breaking the glucoside bonds and by Maillard's reaction. Elemental analysis indicated a reduction in the degree of deacetylation after degradation. The product of Amadori rearrangement and pigmented product melanoidins were determined by 1H NMR, FTIR, UV–Vis, and fluorescence spectroscopy. Enhancement of in vitro antibacterial activity of nanocomposites against Staphylococcus aureus and Escherichia coli was achieved by a single-stage procedure which results in greater mobility of radiation-modified chitosan in the network. This allows the exploitation of its potential, which is reflected in the possibility of the complexing of ultrasmall molecular Ag clusters. These complexes have a considerably stronger antibacterial effect. Ag in molecular form was confirmed by XPS analysis.",
journal = "Radiation Physics and Chemistry",
title = "Improvement of antibacterial activity of Ag-poly(vinyl-alcohol)/chitosan hydrogel by optimizing the procedure of radiolytic synthesis",
volume = "194",
pages = "110045",
doi = "10.1016/j.radphyschem.2022.110045"
}

Krstić, J., Radosavljević, A., Spasojević, J. P., Nikolić, N., Jovanović, U. D., Abazović, N.,& Kačarević-Popović, Z. M.. (2022). Improvement of antibacterial activity of Ag-poly(vinyl-alcohol)/chitosan hydrogel by optimizing the procedure of radiolytic synthesis. in Radiation Physics and Chemistry, 194, 110045.
https://doi.org/10.1016/j.radphyschem.2022.110045

Krstić J, Radosavljević A, Spasojević JP, Nikolić N, Jovanović UD, Abazović N, Kačarević-Popović ZM. Improvement of antibacterial activity of Ag-poly(vinyl-alcohol)/chitosan hydrogel by optimizing the procedure of radiolytic synthesis. in Radiation Physics and Chemistry. 2022;194:110045.
doi:10.1016/j.radphyschem.2022.110045 .

Krstić, Jelena, Radosavljević, Aleksandra, Spasojević, Jelena P., Nikolić, Nikolina, Jovanović, Uroš D., Abazović, Nadica, Kačarević-Popović, Zorica M., "Improvement of antibacterial activity of Ag-poly(vinyl-alcohol)/chitosan hydrogel by optimizing the procedure of radiolytic synthesis" in Radiation Physics and Chemistry, 194 (2022):110045,
https://doi.org/10.1016/j.radphyschem.2022.110045 . .

TY  - CONF
AU  - Nikolić, Nikolina
AU  - Radosavljević, Aleksandra
AU  - Spasojević, Jelena
AU  - Stamenović, Una
AU  - Vodnik, Vesna
AU  - Kačarević-Popović, Zorica
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12493
AB  - Recently, the one of the fastest growing areas in materials sciences is the development of polymer-based smart materials, which can autonomously change their physical and/or chemical properties under external stimuli. Photoactuators as a class of smart materials that can produce a reversible mechanical deformation under light stimuli have attracted tremendous interest due to their potential applications in soft robotics, smart grippers, artificial muscles, and smart devices. Thermosensitive hydrogels with gold nanoparticles (AuNPs) are probably the most commonly used active layers. Under the visible light irradiation, the local photo-thermal shrinking is induced, which enables the external wireless remote control of hydrogels and photo-thermalmechanical motions such as bending, curling, and spiraling [1-3]. In this work, hydrogel nanocomposites based on thermosensitive poly(N-isopropylacrylamide) (PNiPAAm) and AuNPs were produced by radiolytic method. The presence of AuNPs,nanospheres and nanorods, incorporated into PNiPAAm hydrogel was confirmed by UV-Vis spectroscopy, XRD, TEM and SEM. The influence of different shapes of AuNPs on physicochemical properties of AuPNiPAAm hydrogel nanocomposites was investigated. Swelling and deswelling kinetics in water at 25C and 48C,respectively, indicate that all samples showed non-Fickian diffusion (both diffusion and polymer chains relaxation processes control the fluid transport). On the other hand, volume phase transition temperature (VPTT), can be adjusted by the incorporation of different shapes of AuNPs. It has been observed that VPTT decreases from 32.5 C for Au nanorods to 30.5Cfor Au nanospheres. Moreover, Au-PNiPAAm hydrogel nanocomposites possess an excellent -switchable electrical conductivity, especially in the case of Au nanorods.
C3  - The Miller Online Workshop on Radiation Chemistry : Programme and book of abstracts
T1  - Au-PNiPAAm hydrogel nanocomposites as photoactuators for direct optical to mechanical energy conversion
SP  - 86
EP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12493
ER  - 

@conference{
author = "Nikolić, Nikolina and Radosavljević, Aleksandra and Spasojević, Jelena and Stamenović, Una and Vodnik, Vesna and Kačarević-Popović, Zorica",
year = "2022",
abstract = "Recently, the one of the fastest growing areas in materials sciences is the development of polymer-based smart materials, which can autonomously change their physical and/or chemical properties under external stimuli. Photoactuators as a class of smart materials that can produce a reversible mechanical deformation under light stimuli have attracted tremendous interest due to their potential applications in soft robotics, smart grippers, artificial muscles, and smart devices. Thermosensitive hydrogels with gold nanoparticles (AuNPs) are probably the most commonly used active layers. Under the visible light irradiation, the local photo-thermal shrinking is induced, which enables the external wireless remote control of hydrogels and photo-thermalmechanical motions such as bending, curling, and spiraling [1-3]. In this work, hydrogel nanocomposites based on thermosensitive poly(N-isopropylacrylamide) (PNiPAAm) and AuNPs were produced by radiolytic method. The presence of AuNPs,nanospheres and nanorods, incorporated into PNiPAAm hydrogel was confirmed by UV-Vis spectroscopy, XRD, TEM and SEM. The influence of different shapes of AuNPs on physicochemical properties of AuPNiPAAm hydrogel nanocomposites was investigated. Swelling and deswelling kinetics in water at 25C and 48C,respectively, indicate that all samples showed non-Fickian diffusion (both diffusion and polymer chains relaxation processes control the fluid transport). On the other hand, volume phase transition temperature (VPTT), can be adjusted by the incorporation of different shapes of AuNPs. It has been observed that VPTT decreases from 32.5 C for Au nanorods to 30.5Cfor Au nanospheres. Moreover, Au-PNiPAAm hydrogel nanocomposites possess an excellent -switchable electrical conductivity, especially in the case of Au nanorods.",
journal = "The Miller Online Workshop on Radiation Chemistry : Programme and book of abstracts",
title = "Au-PNiPAAm hydrogel nanocomposites as photoactuators for direct optical to mechanical energy conversion",
pages = "86-86",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12493"
}

Nikolić, N., Radosavljević, A., Spasojević, J., Stamenović, U., Vodnik, V.,& Kačarević-Popović, Z.. (2022). Au-PNiPAAm hydrogel nanocomposites as photoactuators for direct optical to mechanical energy conversion. in The Miller Online Workshop on Radiation Chemistry : Programme and book of abstracts, 86-86.
https://hdl.handle.net/21.15107/rcub_vinar_12493

Nikolić N, Radosavljević A, Spasojević J, Stamenović U, Vodnik V, Kačarević-Popović Z. Au-PNiPAAm hydrogel nanocomposites as photoactuators for direct optical to mechanical energy conversion. in The Miller Online Workshop on Radiation Chemistry : Programme and book of abstracts. 2022;:86-86.
https://hdl.handle.net/21.15107/rcub_vinar_12493 .

Nikolić, Nikolina, Radosavljević, Aleksandra, Spasojević, Jelena, Stamenović, Una, Vodnik, Vesna, Kačarević-Popović, Zorica, "Au-PNiPAAm hydrogel nanocomposites as photoactuators for direct optical to mechanical energy conversion" in The Miller Online Workshop on Radiation Chemistry : Programme and book of abstracts (2022):86-86,
https://hdl.handle.net/21.15107/rcub_vinar_12493 .

TY  - CONF
AU  - Nikolić, Nikolina
AU  - Radosavljević, Aleksandra
AU  - Spasojević, Jelena
AU  - Stamenović, Una
AU  - Vodnik, Vesna
AU  - Tadić, Julijana
AU  - Kačarević-Popović, Zorica
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12494
AB  - In this study, bi-layered hydrogel nanocomposites, based on gold nanoparticles (AuNPs) embedded in poly(N-isopropylacrylamide) (PNiPAAm) and poly(vinyl alcohol) (PVA) hydrogel were developed. PNiPAAm with AuNPs represents an active, while PVA represents a passive layer. Crosslinking of polymer matrix with stable 3D structure was obtained by the combination of freezethaw and radiolytic methods, while nanoparticles were synthesized using the seed-mediated approach. The UV-Vis absorption spectra and TEM measurements confirm the presence of spherical AuNPs, with a diameter of 30 nm. The influence of AuNPs on the swelling/deswelling behavior and on volume phase transition temperature (VPTT) in distilled water was investigated. The obtained results showed that values of network and diffusion parameters increase with the incorporation of AuNPs and that the swelling transport mechanism is a non-Fickian transport.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry 2022 : Proceedings
T1  - Physico-chemical characterization of Bi-layered Au-PNiPAAm/PVA hydrogel nanocomposites
VL  - 2
SP  - 371
EP  - 374
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12494
ER  - 

@conference{
author = "Nikolić, Nikolina and Radosavljević, Aleksandra and Spasojević, Jelena and Stamenović, Una and Vodnik, Vesna and Tadić, Julijana and Kačarević-Popović, Zorica",
year = "2022",
abstract = "In this study, bi-layered hydrogel nanocomposites, based on gold nanoparticles (AuNPs) embedded in poly(N-isopropylacrylamide) (PNiPAAm) and poly(vinyl alcohol) (PVA) hydrogel were developed. PNiPAAm with AuNPs represents an active, while PVA represents a passive layer. Crosslinking of polymer matrix with stable 3D structure was obtained by the combination of freezethaw and radiolytic methods, while nanoparticles were synthesized using the seed-mediated approach. The UV-Vis absorption spectra and TEM measurements confirm the presence of spherical AuNPs, with a diameter of 30 nm. The influence of AuNPs on the swelling/deswelling behavior and on volume phase transition temperature (VPTT) in distilled water was investigated. The obtained results showed that values of network and diffusion parameters increase with the incorporation of AuNPs and that the swelling transport mechanism is a non-Fickian transport.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "16th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry 2022 : Proceedings",
title = "Physico-chemical characterization of Bi-layered Au-PNiPAAm/PVA hydrogel nanocomposites",
volume = "2",
pages = "371-374",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12494"
}

Nikolić, N., Radosavljević, A., Spasojević, J., Stamenović, U., Vodnik, V., Tadić, J.,& Kačarević-Popović, Z.. (2022). Physico-chemical characterization of Bi-layered Au-PNiPAAm/PVA hydrogel nanocomposites. in 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry 2022 : Proceedings
Belgrade : Society of Physical Chemists of Serbia., 2, 371-374.
https://hdl.handle.net/21.15107/rcub_vinar_12494

Nikolić N, Radosavljević A, Spasojević J, Stamenović U, Vodnik V, Tadić J, Kačarević-Popović Z. Physico-chemical characterization of Bi-layered Au-PNiPAAm/PVA hydrogel nanocomposites. in 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry 2022 : Proceedings. 2022;2:371-374.
https://hdl.handle.net/21.15107/rcub_vinar_12494 .

Nikolić, Nikolina, Radosavljević, Aleksandra, Spasojević, Jelena, Stamenović, Una, Vodnik, Vesna, Tadić, Julijana, Kačarević-Popović, Zorica, "Physico-chemical characterization of Bi-layered Au-PNiPAAm/PVA hydrogel nanocomposites" in 16th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Physical Chemistry 2022 : Proceedings, 2 (2022):371-374,
https://hdl.handle.net/21.15107/rcub_vinar_12494 .

TY  - CONF
AU  - Nikolić, Nikolina
AU  - Radosavljević, Aleksandra
AU  - Spasojević, Jelena
AU  - Stamenović, Una
AU  - Tadić, Julijana
AU  - Vodnik, Vesna
AU  - Kačarević-Popović, Zorica
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12495
AB  - Recently, one of the fastest growing areas in materials sciences is the development of polymer-based smart materials, which can autonomously change their physical and/or chemical properties under external stimuli. Among them, photoactuators as smart materials that can produce a reversible mechanical deformation under light stimuli have attracted tremendous interest due to their potential applications in soft robotics, artificial muscles, and smart devices. Currently, the fabrication of photoactuators is mainly based on photothermal actuation mechanisms which include expansion/contraction, molecule sorption/desorption, and phase transition. Thermosensitive hydrogels with gold nanoparticles are probably the most commonly used active layers. The functional gold nanoparticles exhibit unique photo-thermal properties as a result of a surface plasmon resonance (SPR) electron-phonon process and intrinsic inter-band transitions. Upon immobilization in thermoresponsive hydrogel, they induce local photo-thermal shrinking under visible light irradiation and thus enable external wireless remote control of hydrogel device and programmable photo-thermomechanical motions such as bending, curling, and spiralling. In this work, bi-layered photoactuators based on thermosensitive poly(N-isopropylacrylamide) (PNiPAAm) hydrogel with incorporated gold nanoparticles as an active layer, and poly(vinyl alcohol) hydrogel as a passive layer were produced. Crosslinking of polymer matrix was done by combination of freeze-thaw and radiolytic methods, while nanoparticles were synthesized using the seed-mediated approach. Two different shapes of nanoparticles were incorporated into PNiPAAm hydrogel, gold nanospheres (AuNPs) with radius around 10 nm and gold nanorods (AuNRs) with aspect ratio of 5 (radius of 10 nm, length of 50 nm). The formation of nanoparticles within the active layer was confirmed by appearance of characteristic SPR bands with maxima around 540 nm for AuNPs, and transversal oscillation at 530 nm and longitudinal oscillation around 760 nm for AuNRs. The XRD data for both AuNPs and AuNRs are consistent with the face-centered cubic (fcc) crystal structure of bulk metallic gold, while the FTIR spectra indicated the existence of physical interaction between nanoparticles and polymer matrix. The influence of different shapes of nanoparticles on physicochemical properties of bi-layered photoactuators was investigated in order to determine swelling and deswelling properties, as well as volume phase transition temperature (VPTT). Incorporation of AuNRs into active layer of photoactuators leads to an increase of both swelling capacity and VPTT. The results obtained from compression measurements shows that mechanical properties of investigated systems depend on shape and concentration of incorporated gold nanorods. Moreover, the photo-thermo-mechanical effect induced by the visible light irradiation was visualized by bending deformation as a consequence of the energy conversion in the active layer
C3  - ICARST-2022 : Second International Conference on Applications of Radiation Science and Technology" : Book of abstracts
T1  - Bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposite photoactuators for direct optical to mechanical energy conversion
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12495
ER  - 

@conference{
author = "Nikolić, Nikolina and Radosavljević, Aleksandra and Spasojević, Jelena and Stamenović, Una and Tadić, Julijana and Vodnik, Vesna and Kačarević-Popović, Zorica",
year = "2022",
abstract = "Recently, one of the fastest growing areas in materials sciences is the development of polymer-based smart materials, which can autonomously change their physical and/or chemical properties under external stimuli. Among them, photoactuators as smart materials that can produce a reversible mechanical deformation under light stimuli have attracted tremendous interest due to their potential applications in soft robotics, artificial muscles, and smart devices. Currently, the fabrication of photoactuators is mainly based on photothermal actuation mechanisms which include expansion/contraction, molecule sorption/desorption, and phase transition. Thermosensitive hydrogels with gold nanoparticles are probably the most commonly used active layers. The functional gold nanoparticles exhibit unique photo-thermal properties as a result of a surface plasmon resonance (SPR) electron-phonon process and intrinsic inter-band transitions. Upon immobilization in thermoresponsive hydrogel, they induce local photo-thermal shrinking under visible light irradiation and thus enable external wireless remote control of hydrogel device and programmable photo-thermomechanical motions such as bending, curling, and spiralling. In this work, bi-layered photoactuators based on thermosensitive poly(N-isopropylacrylamide) (PNiPAAm) hydrogel with incorporated gold nanoparticles as an active layer, and poly(vinyl alcohol) hydrogel as a passive layer were produced. Crosslinking of polymer matrix was done by combination of freeze-thaw and radiolytic methods, while nanoparticles were synthesized using the seed-mediated approach. Two different shapes of nanoparticles were incorporated into PNiPAAm hydrogel, gold nanospheres (AuNPs) with radius around 10 nm and gold nanorods (AuNRs) with aspect ratio of 5 (radius of 10 nm, length of 50 nm). The formation of nanoparticles within the active layer was confirmed by appearance of characteristic SPR bands with maxima around 540 nm for AuNPs, and transversal oscillation at 530 nm and longitudinal oscillation around 760 nm for AuNRs. The XRD data for both AuNPs and AuNRs are consistent with the face-centered cubic (fcc) crystal structure of bulk metallic gold, while the FTIR spectra indicated the existence of physical interaction between nanoparticles and polymer matrix. The influence of different shapes of nanoparticles on physicochemical properties of bi-layered photoactuators was investigated in order to determine swelling and deswelling properties, as well as volume phase transition temperature (VPTT). Incorporation of AuNRs into active layer of photoactuators leads to an increase of both swelling capacity and VPTT. The results obtained from compression measurements shows that mechanical properties of investigated systems depend on shape and concentration of incorporated gold nanorods. Moreover, the photo-thermo-mechanical effect induced by the visible light irradiation was visualized by bending deformation as a consequence of the energy conversion in the active layer",
journal = "ICARST-2022 : Second International Conference on Applications of Radiation Science and Technology" : Book of abstracts",
title = "Bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposite photoactuators for direct optical to mechanical energy conversion",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12495"
}

Nikolić, N., Radosavljević, A., Spasojević, J., Stamenović, U., Tadić, J., Vodnik, V.,& Kačarević-Popović, Z.. (2022). Bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposite photoactuators for direct optical to mechanical energy conversion. in ICARST-2022 : Second International Conference on Applications of Radiation Science and Technology" : Book of abstracts.
https://hdl.handle.net/21.15107/rcub_vinar_12495

Nikolić N, Radosavljević A, Spasojević J, Stamenović U, Tadić J, Vodnik V, Kačarević-Popović Z. Bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposite photoactuators for direct optical to mechanical energy conversion. in ICARST-2022 : Second International Conference on Applications of Radiation Science and Technology" : Book of abstracts. 2022;.
https://hdl.handle.net/21.15107/rcub_vinar_12495 .

Nikolić, Nikolina, Radosavljević, Aleksandra, Spasojević, Jelena, Stamenović, Una, Tadić, Julijana, Vodnik, Vesna, Kačarević-Popović, Zorica, "Bi-layered Au-(PNiPAAm/PVA) hydrogel nanocomposite photoactuators for direct optical to mechanical energy conversion" in ICARST-2022 : Second International Conference on Applications of Radiation Science and Technology" : Book of abstracts (2022),
https://hdl.handle.net/21.15107/rcub_vinar_12495 .

TY  - CONF
AU  - Nikolić, Nikolina
AU  - Spasojević, Jelena
AU  - Radosavljević, Aleksandra
AU  - Vodnik, Vesna
AU  - Kačarević-Popović, Zorica
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12485
AB  - The incorporation of suitable nanomaterials into the stimuli responsive hydrogel matrix enables the hydrogel nanocomposites to become a key soft component of new generation of soft electronic and soft robotic devices1,2. An energy transformation agent, functional gold nanoparticles and nanorods exhibit unique photo-thermal properties as a result of a surface plasmon resonance electron-phonon process and intrinsic inter-band transitions. Upon immobilization in thermo-responsive hydrogel, they induce local photo-thermal shrinking under visible light irradiation and thus enable external wireless remote control of hydrogel device and programmable photo-thermo-mechanical motion. In addition, in this way control of interface conductivity can be realized by switching hydrogel nanocomposites between electrically communicating and non-communicating states. In this work, a soft photo/thermal reversible hydrogel nanocomposite device consisting of gold nanoparticles or nanorods embedded in poly(N-isopropylacrylamide) (PNIPAM) and poly(Nisopropylacrylamide) (PNIPAM)/poly(vinyl alcohol) (PVA) bilayer structure (in order to maximize shape changes), were developed using nanotechnology based on radiation chemistry. The key parameters deciding the actuation characteristics as well as conductivity and percolation threshold, particle diameter and shape as well as interparticle distance, can be easily tailored during synthesis using radiation processing technology. Obtained hydrogel nanocomposite device with wireless remote actuation and electrical control has great potential for lightharvesting and mechanical motion which is required for the construction of soft smart actuator systems for applications in soft robotics, for dense information storage and efficient energy conversion.
C3  - AAAFM-UCLA : International Conference on Advances in Functional Materials : Abstracts book
T1  - Hydrogel nanocomposite photoactuator for direct optical to mechanical energy conversion obtained by ionizing irradiation
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12485
ER  - 

@conference{
author = "Nikolić, Nikolina and Spasojević, Jelena and Radosavljević, Aleksandra and Vodnik, Vesna and Kačarević-Popović, Zorica",
year = "2021",
abstract = "The incorporation of suitable nanomaterials into the stimuli responsive hydrogel matrix enables the hydrogel nanocomposites to become a key soft component of new generation of soft electronic and soft robotic devices1,2. An energy transformation agent, functional gold nanoparticles and nanorods exhibit unique photo-thermal properties as a result of a surface plasmon resonance electron-phonon process and intrinsic inter-band transitions. Upon immobilization in thermo-responsive hydrogel, they induce local photo-thermal shrinking under visible light irradiation and thus enable external wireless remote control of hydrogel device and programmable photo-thermo-mechanical motion. In addition, in this way control of interface conductivity can be realized by switching hydrogel nanocomposites between electrically communicating and non-communicating states. In this work, a soft photo/thermal reversible hydrogel nanocomposite device consisting of gold nanoparticles or nanorods embedded in poly(N-isopropylacrylamide) (PNIPAM) and poly(Nisopropylacrylamide) (PNIPAM)/poly(vinyl alcohol) (PVA) bilayer structure (in order to maximize shape changes), were developed using nanotechnology based on radiation chemistry. The key parameters deciding the actuation characteristics as well as conductivity and percolation threshold, particle diameter and shape as well as interparticle distance, can be easily tailored during synthesis using radiation processing technology. Obtained hydrogel nanocomposite device with wireless remote actuation and electrical control has great potential for lightharvesting and mechanical motion which is required for the construction of soft smart actuator systems for applications in soft robotics, for dense information storage and efficient energy conversion.",
journal = "AAAFM-UCLA : International Conference on Advances in Functional Materials : Abstracts book",
title = "Hydrogel nanocomposite photoactuator for direct optical to mechanical energy conversion obtained by ionizing irradiation",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12485"
}

Nikolić, N., Spasojević, J., Radosavljević, A., Vodnik, V.,& Kačarević-Popović, Z.. (2021). Hydrogel nanocomposite photoactuator for direct optical to mechanical energy conversion obtained by ionizing irradiation. in AAAFM-UCLA : International Conference on Advances in Functional Materials : Abstracts book.
https://hdl.handle.net/21.15107/rcub_vinar_12485

Nikolić N, Spasojević J, Radosavljević A, Vodnik V, Kačarević-Popović Z. Hydrogel nanocomposite photoactuator for direct optical to mechanical energy conversion obtained by ionizing irradiation. in AAAFM-UCLA : International Conference on Advances in Functional Materials : Abstracts book. 2021;.
https://hdl.handle.net/21.15107/rcub_vinar_12485 .

Nikolić, Nikolina, Spasojević, Jelena, Radosavljević, Aleksandra, Vodnik, Vesna, Kačarević-Popović, Zorica, "Hydrogel nanocomposite photoactuator for direct optical to mechanical energy conversion obtained by ionizing irradiation" in AAAFM-UCLA : International Conference on Advances in Functional Materials : Abstracts book (2021),
https://hdl.handle.net/21.15107/rcub_vinar_12485 .

TY  - CONF
AU  - Nikolić, Nikolina
AU  - Spasojević, Jelena
AU  - Radosavljević, Aleksandra
AU  - Stamenović, Una
AU  - Vodnik, Vesna
AU  - Kačarević-Popović, Zorica
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12488
AB  - In recent years, photoactuators as a class of smart materials that can produce a reversible mechanical deformation under light stimuli have attracted tremendous interest due to their potential applications in soft robotics, artificial muscles, and smart devices. Currently, the fabrication of photoactuators is mainly based on photothermal actuation mechanisms which include expansion/contraction, molecule sorption/desorption, and phase transition. Thermosensitive hydrogels with gold nanoparticles (AuNPs) are probably the most commonly used active layers that absorb light energy and convert it to thermal energy, causing reversible mechanical deformation such as bending, curling, and spiraling. This work describes hydrogel nanocomposite photoactuators based on AuNPs and thermosensitive poly(N-isopropylacrylamide) (Au-PNiPAAm), obtained by gamma irradiation. The different shapes of AuNPs were incorporated into PNiPAAm hydrogel, nanospheres with radius  5-10 nm and nanorods with aspect ratio  5 (radius  10 nm, length  50 nm). Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators were investigated in water at 25C and 48C, respectively. All samples showed non-Fickian diffusion (both diffusion and polymer chains relaxation processes control the fluid transport) indicating that incorporation of different shapes of AuNPs into matrices has no influence on the diffusion model. On the other hand, the volume phase transition temperature (VPTT) of photoactuators can be adjusted by the incorporation of different shapes of AuNPs. It has been observed that VPTT decreases from  32.5C for Au nanorods to  30.5C for Au nanospheres, causing a more pronounced photothermal effect in the case of nanospheres.
PB  - Belgrade : Materials Research Society of Serbia – MRS-Serbia
C3  - YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts
T1  - Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators obtained by gamma irradiation
SP  - 137
EP  - 137
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12488
ER  - 

@conference{
author = "Nikolić, Nikolina and Spasojević, Jelena and Radosavljević, Aleksandra and Stamenović, Una and Vodnik, Vesna and Kačarević-Popović, Zorica",
year = "2021",
abstract = "In recent years, photoactuators as a class of smart materials that can produce a reversible mechanical deformation under light stimuli have attracted tremendous interest due to their potential applications in soft robotics, artificial muscles, and smart devices. Currently, the fabrication of photoactuators is mainly based on photothermal actuation mechanisms which include expansion/contraction, molecule sorption/desorption, and phase transition. Thermosensitive hydrogels with gold nanoparticles (AuNPs) are probably the most commonly used active layers that absorb light energy and convert it to thermal energy, causing reversible mechanical deformation such as bending, curling, and spiraling. This work describes hydrogel nanocomposite photoactuators based on AuNPs and thermosensitive poly(N-isopropylacrylamide) (Au-PNiPAAm), obtained by gamma irradiation. The different shapes of AuNPs were incorporated into PNiPAAm hydrogel, nanospheres with radius  5-10 nm and nanorods with aspect ratio  5 (radius  10 nm, length  50 nm). Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators were investigated in water at 25C and 48C, respectively. All samples showed non-Fickian diffusion (both diffusion and polymer chains relaxation processes control the fluid transport) indicating that incorporation of different shapes of AuNPs into matrices has no influence on the diffusion model. On the other hand, the volume phase transition temperature (VPTT) of photoactuators can be adjusted by the incorporation of different shapes of AuNPs. It has been observed that VPTT decreases from  32.5C for Au nanorods to  30.5C for Au nanospheres, causing a more pronounced photothermal effect in the case of nanospheres.",
publisher = "Belgrade : Materials Research Society of Serbia – MRS-Serbia",
journal = "YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts",
title = "Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators obtained by gamma irradiation",
pages = "137-137",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12488"
}

Nikolić, N., Spasojević, J., Radosavljević, A., Stamenović, U., Vodnik, V.,& Kačarević-Popović, Z.. (2021). Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators obtained by gamma irradiation. in YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts
Belgrade : Materials Research Society of Serbia – MRS-Serbia., 137-137.
https://hdl.handle.net/21.15107/rcub_vinar_12488

Nikolić N, Spasojević J, Radosavljević A, Stamenović U, Vodnik V, Kačarević-Popović Z. Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators obtained by gamma irradiation. in YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts. 2021;:137-137.
https://hdl.handle.net/21.15107/rcub_vinar_12488 .

Nikolić, Nikolina, Spasojević, Jelena, Radosavljević, Aleksandra, Stamenović, Una, Vodnik, Vesna, Kačarević-Popović, Zorica, "Swelling and deswelling kinetics of Au-PNiPAAm hydrogel nanocomposite photoactuators obtained by gamma irradiation" in YUCOMAT 2021 : Twenty-second Annual Conference YUCOMAT 2021 : Programme and the Book of abstracts (2021):137-137,
https://hdl.handle.net/21.15107/rcub_vinar_12488 .

TY  - JOUR
AU  - Anđelkov, Nenad
AU  - Riyadh, H
AU  - Ivarsson, M
AU  - Kačarević-Popović, Zorica M.
AU  - Krstić, Jelena
AU  - Wretenberg, P
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9126
AB  - Purpose:Even though various types of scaffolds have been used lately as a complement to microfracture, the exact mechanism of reported cartilage repair improvement when using scaffolds is still unclear. In this study, an effort has been made to identify the specific effects that scaffolds may have on the cells of reparation when using this technique.Methods:A 3‑D model in vitro, representing microfracture and containing both chondrocytes and bone marrow‑derived cells in different experimental conditions was made, and the cells were cultured for eight weeks. Subse‑quently, the constructs containing our 3‑D model were removed from the cell culture medium, fixed in paraffin and analyzed with immunohistochemistry.Results:Bone marrow – derived cells migrated to the upper compartment of the construct through a perforated nylon membrane containing both enzymatically digested‑ and non‑digested particulated cartilage. The histological sections were stained with hematoxylin, eosin, S‑100, SOX‑9, Gomori, and procollagen type I and II. When minced cartilage wasn’t pretreated with collagenase, exclusively bone‑derived cells have created new extracellular matrix as showed by the histological analysis.Conclusions:In this model of microfracture, bone‑derived cells but not chondrocytes have shown to have an active role in new cartilage formation without predigestion with collagenase. Moreover, it seems that the addition of a chitosan‑based scaffold may lead to the improvement of a new cartilage matrix synthesis and integration. This effect hasn’t been seen without the use of scaffold or when a fibrin‑ or a collagen‑based scaffold have been used.
T2  - Journal of Experimental Orthopaedics
T1  - The enhancement of cartilage regeneration by use of a chitosan-based scaffold in a 3D model of microfracture in vitro: a pilot evaluation
VL  - 8
IS  - 1
SP  - 12
DO  - 10.1186/s40634-021-00328-z
ER  - 

@article{
author = "Anđelkov, Nenad and Riyadh, H and Ivarsson, M and Kačarević-Popović, Zorica M. and Krstić, Jelena and Wretenberg, P",
year = "2021",
abstract = "Purpose:Even though various types of scaffolds have been used lately as a complement to microfracture, the exact mechanism of reported cartilage repair improvement when using scaffolds is still unclear. In this study, an effort has been made to identify the specific effects that scaffolds may have on the cells of reparation when using this technique.Methods:A 3‑D model in vitro, representing microfracture and containing both chondrocytes and bone marrow‑derived cells in different experimental conditions was made, and the cells were cultured for eight weeks. Subse‑quently, the constructs containing our 3‑D model were removed from the cell culture medium, fixed in paraffin and analyzed with immunohistochemistry.Results:Bone marrow – derived cells migrated to the upper compartment of the construct through a perforated nylon membrane containing both enzymatically digested‑ and non‑digested particulated cartilage. The histological sections were stained with hematoxylin, eosin, S‑100, SOX‑9, Gomori, and procollagen type I and II. When minced cartilage wasn’t pretreated with collagenase, exclusively bone‑derived cells have created new extracellular matrix as showed by the histological analysis.Conclusions:In this model of microfracture, bone‑derived cells but not chondrocytes have shown to have an active role in new cartilage formation without predigestion with collagenase. Moreover, it seems that the addition of a chitosan‑based scaffold may lead to the improvement of a new cartilage matrix synthesis and integration. This effect hasn’t been seen without the use of scaffold or when a fibrin‑ or a collagen‑based scaffold have been used.",
journal = "Journal of Experimental Orthopaedics",
title = "The enhancement of cartilage regeneration by use of a chitosan-based scaffold in a 3D model of microfracture in vitro: a pilot evaluation",
volume = "8",
number = "1",
pages = "12",
doi = "10.1186/s40634-021-00328-z"
}

Anđelkov, N., Riyadh, H., Ivarsson, M., Kačarević-Popović, Z. M., Krstić, J.,& Wretenberg, P.. (2021). The enhancement of cartilage regeneration by use of a chitosan-based scaffold in a 3D model of microfracture in vitro: a pilot evaluation. in Journal of Experimental Orthopaedics, 8(1), 12.
https://doi.org/10.1186/s40634-021-00328-z

Anđelkov N, Riyadh H, Ivarsson M, Kačarević-Popović ZM, Krstić J, Wretenberg P. The enhancement of cartilage regeneration by use of a chitosan-based scaffold in a 3D model of microfracture in vitro: a pilot evaluation. in Journal of Experimental Orthopaedics. 2021;8(1):12.
doi:10.1186/s40634-021-00328-z .

Anđelkov, Nenad, Riyadh, H, Ivarsson, M, Kačarević-Popović, Zorica M., Krstić, Jelena, Wretenberg, P, "The enhancement of cartilage regeneration by use of a chitosan-based scaffold in a 3D model of microfracture in vitro: a pilot evaluation" in Journal of Experimental Orthopaedics, 8, no. 1 (2021):12,
https://doi.org/10.1186/s40634-021-00328-z . .

TY  - JOUR
AU  - Lojpur, Vesna
AU  - Krstić, Jelena
AU  - Kačarević-Popović, Zorica M.
AU  - Mitrić, Miodrag
AU  - Rakočević, Zlatko Lj.
AU  - Validžić, Ivana Lj.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1915
AB  - We present here a novel solar cell made of ITO/composite p-doped Sb2S3 + P3HT + PANI + TiO2/amorphous Sb2S3+P3HT+PANI+TiO2/n-doped Sb2S3 + P3HT + PANI + TiO2/solid carrier/aluminum as counter electrode. With spraying technique, the layers were deposited and the thickness of films was 1m. A new solid carrier of electrolyte was a blend consisted of chitosan (low MW), polyethylene glycol and electrolyte. X-ray diffraction was recorded to confirm the amorphous nature of the blend. Information about the surface appearance and roughness of a solid carrier dry and soaked in the electrolyte was given by atomic force microscopy. The solar cell was examined at very low and low light intensity (5% and 35% of sun, respectively), and at standard test conditions (100% of sun) using different light sources. The whole cell surface was 7.5cm(2) while the illuminated part was 3cm(2). Obtained results expressed for the illuminated surface showed the highest efficiency of 23.1% at 5% of sun while the efficiency of the cell was 2.9% at 35% of sun and only 0.75% at intensity of 100% of sun.
T2  - International Journal of Energy Research
T1  - Efficient and novel Sb2S3 based solar cells with chitosan/poly(ethylene glycol)/electrolyte blend
VL  - 42
IS  - 2
SP  - 843
EP  - 852
DO  - 10.1002/er.3899
ER  - 

@article{
author = "Lojpur, Vesna and Krstić, Jelena and Kačarević-Popović, Zorica M. and Mitrić, Miodrag and Rakočević, Zlatko Lj. and Validžić, Ivana Lj.",
year = "2018",
abstract = "We present here a novel solar cell made of ITO/composite p-doped Sb2S3 + P3HT + PANI + TiO2/amorphous Sb2S3+P3HT+PANI+TiO2/n-doped Sb2S3 + P3HT + PANI + TiO2/solid carrier/aluminum as counter electrode. With spraying technique, the layers were deposited and the thickness of films was 1m. A new solid carrier of electrolyte was a blend consisted of chitosan (low MW), polyethylene glycol and electrolyte. X-ray diffraction was recorded to confirm the amorphous nature of the blend. Information about the surface appearance and roughness of a solid carrier dry and soaked in the electrolyte was given by atomic force microscopy. The solar cell was examined at very low and low light intensity (5% and 35% of sun, respectively), and at standard test conditions (100% of sun) using different light sources. The whole cell surface was 7.5cm(2) while the illuminated part was 3cm(2). Obtained results expressed for the illuminated surface showed the highest efficiency of 23.1% at 5% of sun while the efficiency of the cell was 2.9% at 35% of sun and only 0.75% at intensity of 100% of sun.",
journal = "International Journal of Energy Research",
title = "Efficient and novel Sb2S3 based solar cells with chitosan/poly(ethylene glycol)/electrolyte blend",
volume = "42",
number = "2",
pages = "843-852",
doi = "10.1002/er.3899"
}

Lojpur, V., Krstić, J., Kačarević-Popović, Z. M., Mitrić, M., Rakočević, Z. Lj.,& Validžić, I. Lj.. (2018). Efficient and novel Sb2S3 based solar cells with chitosan/poly(ethylene glycol)/electrolyte blend. in International Journal of Energy Research, 42(2), 843-852.
https://doi.org/10.1002/er.3899

Lojpur V, Krstić J, Kačarević-Popović ZM, Mitrić M, Rakočević ZL, Validžić IL. Efficient and novel Sb2S3 based solar cells with chitosan/poly(ethylene glycol)/electrolyte blend. in International Journal of Energy Research. 2018;42(2):843-852.
doi:10.1002/er.3899 .

Lojpur, Vesna, Krstić, Jelena, Kačarević-Popović, Zorica M., Mitrić, Miodrag, Rakočević, Zlatko Lj., Validžić, Ivana Lj., "Efficient and novel Sb2S3 based solar cells with chitosan/poly(ethylene glycol)/electrolyte blend" in International Journal of Energy Research, 42, no. 2 (2018):843-852,
https://doi.org/10.1002/er.3899 . .

TY  - JOUR
AU  - Lojpur, Vesna
AU  - Krstić, Jelena
AU  - Kačarević-Popović, Zorica M.
AU  - Filipović, Nenad
AU  - Validžić, Ivana Lj.
PY  - 2018
UR  - http://link.springer.com/10.1007/s10311-017-0702-7
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7737
AB  - Producing green and efficient energy sources is a major challenge. As a consequence, the use of photovoltaic devices for conversion of light into electricity is growing worldwide. A lot of effort had been invested to create high-efficient solar cells, but their durability, stability, flexibility and efficiency at low light intensities are still unexplored. Here, we built a flexible solar cell made of p-doped, amorphized a-undoped and n-doped Sb2S3 solid carrier loaded with electrolyte. Indium tin oxide glass was the working electrode, and aluminium was the counter electrode. Every (p-a-n) flexible Sb2S3/solid carrier layers were obtained using a cheap casting/solvent evaporation technique, from a blend consisted of chitosan, polyethylene glycol and electrolyte containing 0.5 M potassium iodide and 0.05 M iodine, and corresponding synthesized amorphized a-undoped and p and n-doped Sb2S3 semiconductor. Results show that flexible Sb2S3 solar cell possesses good stability and efficiency of about 10% at 5% sun. Overall, our findings demonstrate for the first time that flexible solar cell can be made and used for low light intensity applications.
T2  - Environmental Chemistry Letters
T1  - Flexible and high-efficiency Sb2S3/solid carrier solar cell at low light intensity
VL  - 16
IS  - 2
SP  - 659
EP  - 664
DO  - 10.1007/s10311-017-0702-7
ER  - 

@article{
author = "Lojpur, Vesna and Krstić, Jelena and Kačarević-Popović, Zorica M. and Filipović, Nenad and Validžić, Ivana Lj.",
year = "2018",
abstract = "Producing green and efficient energy sources is a major challenge. As a consequence, the use of photovoltaic devices for conversion of light into electricity is growing worldwide. A lot of effort had been invested to create high-efficient solar cells, but their durability, stability, flexibility and efficiency at low light intensities are still unexplored. Here, we built a flexible solar cell made of p-doped, amorphized a-undoped and n-doped Sb2S3 solid carrier loaded with electrolyte. Indium tin oxide glass was the working electrode, and aluminium was the counter electrode. Every (p-a-n) flexible Sb2S3/solid carrier layers were obtained using a cheap casting/solvent evaporation technique, from a blend consisted of chitosan, polyethylene glycol and electrolyte containing 0.5 M potassium iodide and 0.05 M iodine, and corresponding synthesized amorphized a-undoped and p and n-doped Sb2S3 semiconductor. Results show that flexible Sb2S3 solar cell possesses good stability and efficiency of about 10% at 5% sun. Overall, our findings demonstrate for the first time that flexible solar cell can be made and used for low light intensity applications.",
journal = "Environmental Chemistry Letters",
title = "Flexible and high-efficiency Sb2S3/solid carrier solar cell at low light intensity",
volume = "16",
number = "2",
pages = "659-664",
doi = "10.1007/s10311-017-0702-7"
}

Lojpur, V., Krstić, J., Kačarević-Popović, Z. M., Filipović, N.,& Validžić, I. Lj.. (2018). Flexible and high-efficiency Sb2S3/solid carrier solar cell at low light intensity. in Environmental Chemistry Letters, 16(2), 659-664.
https://doi.org/10.1007/s10311-017-0702-7

Lojpur V, Krstić J, Kačarević-Popović ZM, Filipović N, Validžić IL. Flexible and high-efficiency Sb2S3/solid carrier solar cell at low light intensity. in Environmental Chemistry Letters. 2018;16(2):659-664.
doi:10.1007/s10311-017-0702-7 .

Lojpur, Vesna, Krstić, Jelena, Kačarević-Popović, Zorica M., Filipović, Nenad, Validžić, Ivana Lj., "Flexible and high-efficiency Sb2S3/solid carrier solar cell at low light intensity" in Environmental Chemistry Letters, 16, no. 2 (2018):659-664,
https://doi.org/10.1007/s10311-017-0702-7 . .

TY  - JOUR
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Radosavljević, Aleksandra
AU  - Spasojević, Jelena P.
AU  - Carević, Milica
AU  - Mitrić, Miodrag
AU  - Kačarević-Popović, Zorica M.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1321
AB  - In this study, the nanocomposites based on semiconductor lead sulfide (PbS) nanoparticles and poly (vinyl alcohol) (PVA) were investigated. The gamma irradiation induced in situ incorporation of PbS nanoparticles in crosslinked polymer network i.e. PVA hydrogel was performed. PVA hydrogel was previously obtained also under the influence of gamma irradiation. UV Vis absorption and X-ray diffraction measurements were employed to investigate optical and structural properties of PbS nano particles, respectively, and obtained results indicates the presence of nanoparticles with approximately 6 nm in diameter and face centered cubic rock-salt crystal structure. The porous morphology was confirmed by scanning electron microscopy. Swelling data revealed that investigated hydrogels (PVA and PbS-PVA nanocomposite) shows non-Fickian diffusion, indicating that both diffusion and polymer relaxation processes controlled the fluid transport. The values of diffusion coefficients have an order of magnitude 10(-9) cm(2)/s (typical values for water diffusion in polymers) and the best fit with the experimental results showed the Etters approximation. Comparing the thermal properties of PbS-PVA xerogel nanocomposite with PVA xerogel it was observed that incorporation of PbS nanoparticles in crosslinked PVA matrix just slightly enhanced the thermal stability of nanocomposite. (C) 2016 Elsevier Ltd. All rights reserved.
T2  - Radiation Physics and Chemistry
T1  - Gamma irradiation induced in situ synthesis of lead sulfide nanoparticles in poly(vinyl alcohol) hydrogel
VL  - 130
SP  - 282
EP  - 290
DO  - 10.1016/j.radphyschem.2016.09.003
ER  - 

@article{
author = "Kuljanin-Jakovljević, Jadranka Ž. and Radosavljević, Aleksandra and Spasojević, Jelena P. and Carević, Milica and Mitrić, Miodrag and Kačarević-Popović, Zorica M.",
year = "2017",
abstract = "In this study, the nanocomposites based on semiconductor lead sulfide (PbS) nanoparticles and poly (vinyl alcohol) (PVA) were investigated. The gamma irradiation induced in situ incorporation of PbS nanoparticles in crosslinked polymer network i.e. PVA hydrogel was performed. PVA hydrogel was previously obtained also under the influence of gamma irradiation. UV Vis absorption and X-ray diffraction measurements were employed to investigate optical and structural properties of PbS nano particles, respectively, and obtained results indicates the presence of nanoparticles with approximately 6 nm in diameter and face centered cubic rock-salt crystal structure. The porous morphology was confirmed by scanning electron microscopy. Swelling data revealed that investigated hydrogels (PVA and PbS-PVA nanocomposite) shows non-Fickian diffusion, indicating that both diffusion and polymer relaxation processes controlled the fluid transport. The values of diffusion coefficients have an order of magnitude 10(-9) cm(2)/s (typical values for water diffusion in polymers) and the best fit with the experimental results showed the Etters approximation. Comparing the thermal properties of PbS-PVA xerogel nanocomposite with PVA xerogel it was observed that incorporation of PbS nanoparticles in crosslinked PVA matrix just slightly enhanced the thermal stability of nanocomposite. (C) 2016 Elsevier Ltd. All rights reserved.",
journal = "Radiation Physics and Chemistry",
title = "Gamma irradiation induced in situ synthesis of lead sulfide nanoparticles in poly(vinyl alcohol) hydrogel",
volume = "130",
pages = "282-290",
doi = "10.1016/j.radphyschem.2016.09.003"
}

Kuljanin-Jakovljević, J. Ž., Radosavljević, A., Spasojević, J. P., Carević, M., Mitrić, M.,& Kačarević-Popović, Z. M.. (2017). Gamma irradiation induced in situ synthesis of lead sulfide nanoparticles in poly(vinyl alcohol) hydrogel. in Radiation Physics and Chemistry, 130, 282-290.
https://doi.org/10.1016/j.radphyschem.2016.09.003

Kuljanin-Jakovljević JŽ, Radosavljević A, Spasojević JP, Carević M, Mitrić M, Kačarević-Popović ZM. Gamma irradiation induced in situ synthesis of lead sulfide nanoparticles in poly(vinyl alcohol) hydrogel. in Radiation Physics and Chemistry. 2017;130:282-290.
doi:10.1016/j.radphyschem.2016.09.003 .

Kuljanin-Jakovljević, Jadranka Ž., Radosavljević, Aleksandra, Spasojević, Jelena P., Carević, Milica, Mitrić, Miodrag, Kačarević-Popović, Zorica M., "Gamma irradiation induced in situ synthesis of lead sulfide nanoparticles in poly(vinyl alcohol) hydrogel" in Radiation Physics and Chemistry, 130 (2017):282-290,
https://doi.org/10.1016/j.radphyschem.2016.09.003 . .

TY  - JOUR
AU  - Lojpur, Vesna
AU  - Mitrić, Miodrag
AU  - Kačarević-Popović, Zorica M.
AU  - Radosavljević, Aleksandra
AU  - Rakočević, Zlatko Lj.
AU  - Validžić, Ivana Lj.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1810
AB  - We report here on an inexpensive, solid and stable solar cell designed and made entirely of synthesized materials, Sb2S3/ hypericin (dye) thin film on ITO-coaled glass (working electrode), aluminum (counter electrode), and PVA matrix (solid carrier) loaded, with electrolyte (0.5M KI+ 0.05M I-2). The fact, that the cell is inexpensive, hut also stable and. solid, with efficiency of around 1.3%/cm(2) at a very low light intensity of only 5% sun, makes it particularly suitable for indoor applications. At higher light, intensities of 25 and 55% sun, however, the cell exhibits lower efficiency, around 0.3 and 0.07%/cm(2), respectively. Development of low-cost cell technology combined with understanding of low light utilization and, setting of standard conditions should be some of the future directions the research in this area should, follow. Therefore, in this work, we tried to give sufficient reasons for establishing standard conditions related to low light, intensity. (C) 2017 American Institute of Chemical Engineers.
T2  - Environmental Progress and Sustainable Energy
T1  - The Role of Low Light Intensity: A Cheap, Stable, and Solidly Efficient Amorphous Sb2S3 Powder/Hypericin Composite/PVA Matrix Loaded with Electrolyte Solar Cell
VL  - 36
IS  - 5
SP  - 1507
EP  - 1516
DO  - 10.1002/ep.12597
ER  - 

@article{
author = "Lojpur, Vesna and Mitrić, Miodrag and Kačarević-Popović, Zorica M. and Radosavljević, Aleksandra and Rakočević, Zlatko Lj. and Validžić, Ivana Lj.",
year = "2017",
abstract = "We report here on an inexpensive, solid and stable solar cell designed and made entirely of synthesized materials, Sb2S3/ hypericin (dye) thin film on ITO-coaled glass (working electrode), aluminum (counter electrode), and PVA matrix (solid carrier) loaded, with electrolyte (0.5M KI+ 0.05M I-2). The fact, that the cell is inexpensive, hut also stable and. solid, with efficiency of around 1.3%/cm(2) at a very low light intensity of only 5% sun, makes it particularly suitable for indoor applications. At higher light, intensities of 25 and 55% sun, however, the cell exhibits lower efficiency, around 0.3 and 0.07%/cm(2), respectively. Development of low-cost cell technology combined with understanding of low light utilization and, setting of standard conditions should be some of the future directions the research in this area should, follow. Therefore, in this work, we tried to give sufficient reasons for establishing standard conditions related to low light, intensity. (C) 2017 American Institute of Chemical Engineers.",
journal = "Environmental Progress and Sustainable Energy",
title = "The Role of Low Light Intensity: A Cheap, Stable, and Solidly Efficient Amorphous Sb2S3 Powder/Hypericin Composite/PVA Matrix Loaded with Electrolyte Solar Cell",
volume = "36",
number = "5",
pages = "1507-1516",
doi = "10.1002/ep.12597"
}

Lojpur, V., Mitrić, M., Kačarević-Popović, Z. M., Radosavljević, A., Rakočević, Z. Lj.,& Validžić, I. Lj.. (2017). The Role of Low Light Intensity: A Cheap, Stable, and Solidly Efficient Amorphous Sb2S3 Powder/Hypericin Composite/PVA Matrix Loaded with Electrolyte Solar Cell. in Environmental Progress and Sustainable Energy, 36(5), 1507-1516.
https://doi.org/10.1002/ep.12597

Lojpur V, Mitrić M, Kačarević-Popović ZM, Radosavljević A, Rakočević ZL, Validžić IL. The Role of Low Light Intensity: A Cheap, Stable, and Solidly Efficient Amorphous Sb2S3 Powder/Hypericin Composite/PVA Matrix Loaded with Electrolyte Solar Cell. in Environmental Progress and Sustainable Energy. 2017;36(5):1507-1516.
doi:10.1002/ep.12597 .

Lojpur, Vesna, Mitrić, Miodrag, Kačarević-Popović, Zorica M., Radosavljević, Aleksandra, Rakočević, Zlatko Lj., Validžić, Ivana Lj., "The Role of Low Light Intensity: A Cheap, Stable, and Solidly Efficient Amorphous Sb2S3 Powder/Hypericin Composite/PVA Matrix Loaded with Electrolyte Solar Cell" in Environmental Progress and Sustainable Energy, 36, no. 5 (2017):1507-1516,
https://doi.org/10.1002/ep.12597 . .

TY  - JOUR
AU  - Milikic, Jadranka
AU  - Stoševski, Ivan
AU  - Krstić, Jelena
AU  - Kačarević-Popović, Zorica M.
AU  - Miljanić, Šćepan S.
AU  - Šljukić, Biljana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1803
AB  - Monitoring bromides (Br-) is of crucial importance since bromates, potential human carcinogens, are formed during ozonation of water containing bromides in concentrations GT 100 mu gL(-1). Within this study, silver (Ag) and four carbon-supported Ag catalysts were synthesized by the gamma-radiation method and their morphology and structure examined using transmission electron microscopy, X-ray diffraction, and UV-Vis analysis. The nanocatalysts were tested for Br- sensing in aqueous media using cyclic voltammetry. All five Ag materials exhibited electroactivity for sensing of Br- ions, with pure Ag catalyst giving the best response to Br- ions presence in terms of the lowest limit of detection. Sensing of bromides was also explored in tap water after addition of bromides suggesting that herein prepared catalysts could be used for bromides detection in real samples. Furthermore, sensing of other halogen ions, namely, chlorides and iodides, was examined, and response due to chloride presence was recorded.
T2  - Journal of Analytical Methods in Chemistry
T1  - Electroanalytical Sensing of Bromides Using Radiolytically Synthesized Silver Nanoparticle Electrocatalysts
DO  - 10.1155/2017/2028417
ER  - 

@article{
author = "Milikic, Jadranka and Stoševski, Ivan and Krstić, Jelena and Kačarević-Popović, Zorica M. and Miljanić, Šćepan S. and Šljukić, Biljana",
year = "2017",
abstract = "Monitoring bromides (Br-) is of crucial importance since bromates, potential human carcinogens, are formed during ozonation of water containing bromides in concentrations GT 100 mu gL(-1). Within this study, silver (Ag) and four carbon-supported Ag catalysts were synthesized by the gamma-radiation method and their morphology and structure examined using transmission electron microscopy, X-ray diffraction, and UV-Vis analysis. The nanocatalysts were tested for Br- sensing in aqueous media using cyclic voltammetry. All five Ag materials exhibited electroactivity for sensing of Br- ions, with pure Ag catalyst giving the best response to Br- ions presence in terms of the lowest limit of detection. Sensing of bromides was also explored in tap water after addition of bromides suggesting that herein prepared catalysts could be used for bromides detection in real samples. Furthermore, sensing of other halogen ions, namely, chlorides and iodides, was examined, and response due to chloride presence was recorded.",
journal = "Journal of Analytical Methods in Chemistry",
title = "Electroanalytical Sensing of Bromides Using Radiolytically Synthesized Silver Nanoparticle Electrocatalysts",
doi = "10.1155/2017/2028417"
}

Milikic, J., Stoševski, I., Krstić, J., Kačarević-Popović, Z. M., Miljanić, Š. S.,& Šljukić, B.. (2017). Electroanalytical Sensing of Bromides Using Radiolytically Synthesized Silver Nanoparticle Electrocatalysts. in Journal of Analytical Methods in Chemistry.
https://doi.org/10.1155/2017/2028417

Milikic J, Stoševski I, Krstić J, Kačarević-Popović ZM, Miljanić ŠS, Šljukić B. Electroanalytical Sensing of Bromides Using Radiolytically Synthesized Silver Nanoparticle Electrocatalysts. in Journal of Analytical Methods in Chemistry. 2017;.
doi:10.1155/2017/2028417 .

Milikic, Jadranka, Stoševski, Ivan, Krstić, Jelena, Kačarević-Popović, Zorica M., Miljanić, Šćepan S., Šljukić, Biljana, "Electroanalytical Sensing of Bromides Using Radiolytically Synthesized Silver Nanoparticle Electrocatalysts" in Journal of Analytical Methods in Chemistry (2017),
https://doi.org/10.1155/2017/2028417 . .

TY  - JOUR
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Krstić, Jelena
AU  - Mitrić, Miodrag
AU  - Popović, Maja
AU  - Rakočević, Zlatko Lj.
AU  - Kalagasidis Krušić, Melina
AU  - Kačarević-Popović, Zorica M.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1562
AB  - To produce well-defined metal clusters stabilized in protective matrix, poly(N-isopropylacrylamide) (PNi-PAAm) hydrogel with different initial concentration of polymer was used as nanoreactor. The in situ synthesis of well dispersed silver nanoparticles (AgNPs) was performed by gamma irradiation. The obtained AgNPs are spherical in shape with the diameter less than 20 nm. Crystalline properties of nanoparticles such as size, texture coefficient, strain, stress, lattice parameter, d-spacing, and dislocation density have been calculated using XRD data. Results confirm that the changes of lattice parameter of crystalline AgNPs sensitively reflect their state of strain and stress depending on the formation conditions (i.e., on the concentration of PNiPAAm) and on the diameter of AgNPs. The negative lattice strain and compression stress were observed for the smaller AgNPs (lattice contraction), while for the larger AgNPs are positively strained and under tensile stress (lattice expansion). XPS spectra revealed the donor-acceptor type of interaction between carbonyl oxygen from PNiPAAm and AgNPs (positive shift of high BE component of O 1s and negative shift of Ag 3d BE). The greater dislocation density of smaller AgNPs incorporated in more concentrated PNiPAAm, resulted in more binding sites and stronger interaction with polymer. (C) 2015 Society of Plastics Engineers
T2  - Polymer Composites
T1  - Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel
VL  - 38
IS  - 5
SP  - 1014
EP  - 1026
DO  - 10.1002/pc.23665
ER  - 

@article{
author = "Spasojević, Jelena P. and Radosavljević, Aleksandra and Krstić, Jelena and Mitrić, Miodrag and Popović, Maja and Rakočević, Zlatko Lj. and Kalagasidis Krušić, Melina and Kačarević-Popović, Zorica M.",
year = "2017",
abstract = "To produce well-defined metal clusters stabilized in protective matrix, poly(N-isopropylacrylamide) (PNi-PAAm) hydrogel with different initial concentration of polymer was used as nanoreactor. The in situ synthesis of well dispersed silver nanoparticles (AgNPs) was performed by gamma irradiation. The obtained AgNPs are spherical in shape with the diameter less than 20 nm. Crystalline properties of nanoparticles such as size, texture coefficient, strain, stress, lattice parameter, d-spacing, and dislocation density have been calculated using XRD data. Results confirm that the changes of lattice parameter of crystalline AgNPs sensitively reflect their state of strain and stress depending on the formation conditions (i.e., on the concentration of PNiPAAm) and on the diameter of AgNPs. The negative lattice strain and compression stress were observed for the smaller AgNPs (lattice contraction), while for the larger AgNPs are positively strained and under tensile stress (lattice expansion). XPS spectra revealed the donor-acceptor type of interaction between carbonyl oxygen from PNiPAAm and AgNPs (positive shift of high BE component of O 1s and negative shift of Ag 3d BE). The greater dislocation density of smaller AgNPs incorporated in more concentrated PNiPAAm, resulted in more binding sites and stronger interaction with polymer. (C) 2015 Society of Plastics Engineers",
journal = "Polymer Composites",
title = "Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel",
volume = "38",
number = "5",
pages = "1014-1026",
doi = "10.1002/pc.23665"
}

Spasojević, J. P., Radosavljević, A., Krstić, J., Mitrić, M., Popović, M., Rakočević, Z. Lj., Kalagasidis Krušić, M.,& Kačarević-Popović, Z. M.. (2017). Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel. in Polymer Composites, 38(5), 1014-1026.
https://doi.org/10.1002/pc.23665

Spasojević JP, Radosavljević A, Krstić J, Mitrić M, Popović M, Rakočević ZL, Kalagasidis Krušić M, Kačarević-Popović ZM. Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel. in Polymer Composites. 2017;38(5):1014-1026.
doi:10.1002/pc.23665 .

Spasojević, Jelena P., Radosavljević, Aleksandra, Krstić, Jelena, Mitrić, Miodrag, Popović, Maja, Rakočević, Zlatko Lj., Kalagasidis Krušić, Melina, Kačarević-Popović, Zorica M., "Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel" in Polymer Composites, 38, no. 5 (2017):1014-1026,
https://doi.org/10.1002/pc.23665 . .

TY  - JOUR
AU  - Stoševski, Ivan
AU  - Krstić, Jelena
AU  - Milikic, Jadranka
AU  - Šljukić, Biljana
AU  - Kačarević-Popović, Zorica M.
AU  - Mentus, Slavko V.
AU  - Miljanić, Šćepan S.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1054
AB  - Carbon-supported silver nanoparticles (Ag:NPs/C) were synthesized by gamma irradiation-induced reduction method using the poly(vinyl alcohol) or poly(vinyl alcohol)/chitosan polymer as stabilizer. Prepared samples were characterized using transmission electron microscopy and X-ray diffractometry. Subsequently, Ag:NPs/C were studied using rotating disc and rotating ring disc method as electrocatalysts for ORR (oxygen reduction reaction) and BOR (borohydride oxidation reaction) for potential application in alkaline fuel cells. The synthesis method used herein offers simple and fast approach for catalytic ink preparation, since the ink is prepared in one-step radiation process, simultaneously with Ag+ ions reduction. Very high and stable catalytic efficiency toward ORR via 4e(-) path was evidenced during 4000 square pulse polarization cycles. BOR, accompanied with the simultaneous borohydride ion hydrolysis, was found to proceed at the oxidized Ag surface. (C) 2016 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Energy
T1  - Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells
VL  - 101
SP  - 79
EP  - 90
DO  - 10.1016/j.energy.2016.02.003
ER  - 

@article{
author = "Stoševski, Ivan and Krstić, Jelena and Milikic, Jadranka and Šljukić, Biljana and Kačarević-Popović, Zorica M. and Mentus, Slavko V. and Miljanić, Šćepan S.",
year = "2016",
abstract = "Carbon-supported silver nanoparticles (Ag:NPs/C) were synthesized by gamma irradiation-induced reduction method using the poly(vinyl alcohol) or poly(vinyl alcohol)/chitosan polymer as stabilizer. Prepared samples were characterized using transmission electron microscopy and X-ray diffractometry. Subsequently, Ag:NPs/C were studied using rotating disc and rotating ring disc method as electrocatalysts for ORR (oxygen reduction reaction) and BOR (borohydride oxidation reaction) for potential application in alkaline fuel cells. The synthesis method used herein offers simple and fast approach for catalytic ink preparation, since the ink is prepared in one-step radiation process, simultaneously with Ag+ ions reduction. Very high and stable catalytic efficiency toward ORR via 4e(-) path was evidenced during 4000 square pulse polarization cycles. BOR, accompanied with the simultaneous borohydride ion hydrolysis, was found to proceed at the oxidized Ag surface. (C) 2016 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Energy",
title = "Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells",
volume = "101",
pages = "79-90",
doi = "10.1016/j.energy.2016.02.003"
}

Stoševski, I., Krstić, J., Milikic, J., Šljukić, B., Kačarević-Popović, Z. M., Mentus, S. V.,& Miljanić, Š. S.. (2016). Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells. in Energy
Elsevier., 101, 79-90.
https://doi.org/10.1016/j.energy.2016.02.003

Stoševski I, Krstić J, Milikic J, Šljukić B, Kačarević-Popović ZM, Mentus SV, Miljanić ŠS. Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells. in Energy. 2016;101:79-90.
doi:10.1016/j.energy.2016.02.003 .

Stoševski, Ivan, Krstić, Jelena, Milikic, Jadranka, Šljukić, Biljana, Kačarević-Popović, Zorica M., Mentus, Slavko V., Miljanić, Šćepan S., "Radiolitically synthesized nano Ag/C catalysts for oxygen reduction and borohydride oxidation reactions in alkaline media, for potential applications in fuel cells" in Energy, 101 (2016):79-90,
https://doi.org/10.1016/j.energy.2016.02.003 . .

TY  - CONF
AU  - Radosavljević, Aleksandra
AU  - Krstić, Jelena
AU  - Spasojević, Jelena P.
AU  - Kačarević-Popović, Zorica M.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9222
AB  - This  work  describes  the  Au-PVA  hydrogel  nanocomposites  synthesized  by radiolytic in   situincorporation   of   gold   nanoparticles   (Au   NPs)   into poly(vinyl  alcohol)  (PVA)  hydrogel.  Synthesis  of  nanocomposites  was conducted  as  two-step  gamma  irradiation  induced  process.  In  the  first  step, the  crosslinking  of  polymer  chains  occurs  and  PVA  hydrogel  with  a  large number  of  pores  was  obtained.  In  the  second  step,  these  pores  serve  as nanoreactors  for  the  formation  of  Au  NPs.  The  presence  of  Au  NPs  was confirmed   by   absorption   spectra,   while   morphological   and   structural analysis reveals the spherical shape of Au NPs, with the diameter around 15 nm  and fcccrystal  structure.  The  structural  parameters  of  xerogels  indicate that  incorporation  of  Au  NPs  induce  the  expansion  of  polymer  network. Long-time  stability  of  Au-PVA  hydrogel  nanocomposites  is  caused  by interactions between the surface of Au NPs and OH groups of PVA chains.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - Radiolytic incorporation of gold nanoparticles into PVA hydrogel
SP  - H-22-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9222
ER  - 

@conference{
author = "Radosavljević, Aleksandra and Krstić, Jelena and Spasojević, Jelena P. and Kačarević-Popović, Zorica M.",
year = "2016",
abstract = "This  work  describes  the  Au-PVA  hydrogel  nanocomposites  synthesized  by radiolytic in   situincorporation   of   gold   nanoparticles   (Au   NPs)   into poly(vinyl  alcohol)  (PVA)  hydrogel.  Synthesis  of  nanocomposites  was conducted  as  two-step  gamma  irradiation  induced  process.  In  the  first  step, the  crosslinking  of  polymer  chains  occurs  and  PVA  hydrogel  with  a  large number  of  pores  was  obtained.  In  the  second  step,  these  pores  serve  as nanoreactors  for  the  formation  of  Au  NPs.  The  presence  of  Au  NPs  was confirmed   by   absorption   spectra,   while   morphological   and   structural analysis reveals the spherical shape of Au NPs, with the diameter around 15 nm  and fcccrystal  structure.  The  structural  parameters  of  xerogels  indicate that  incorporation  of  Au  NPs  induce  the  expansion  of  polymer  network. Long-time  stability  of  Au-PVA  hydrogel  nanocomposites  is  caused  by interactions between the surface of Au NPs and OH groups of PVA chains.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "Radiolytic incorporation of gold nanoparticles into PVA hydrogel",
pages = "H-22-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9222"
}

Radosavljević, A., Krstić, J., Spasojević, J. P.,& Kačarević-Popović, Z. M.. (2016). Radiolytic incorporation of gold nanoparticles into PVA hydrogel. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., H-22-P.
https://hdl.handle.net/21.15107/rcub_vinar_9222

Radosavljević A, Krstić J, Spasojević JP, Kačarević-Popović ZM. Radiolytic incorporation of gold nanoparticles into PVA hydrogel. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:H-22-P.
https://hdl.handle.net/21.15107/rcub_vinar_9222 .

Radosavljević, Aleksandra, Krstić, Jelena, Spasojević, Jelena P., Kačarević-Popović, Zorica M., "Radiolytic incorporation of gold nanoparticles into PVA hydrogel" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):H-22-P,
https://hdl.handle.net/21.15107/rcub_vinar_9222 .

TY  - CONF
AU  - Milikić, J.
AU  - Stoševski, I.
AU  - Krstić, Jelena
AU  - Kačarević-Popović, Zorica M.
AU  - Miljanić, Šćepan S.
AU  - Šljukić, B.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9181
AB  - Silver nanoparticles supported on carbon (AgNP/C) were prepared by theγ–radiation  reduction  method and  characterised  using  transmission  electron microscopy  and  X–ray  diffraction.  Subsequently,  glassy  carbon  electrode was  modified  with  the  prepared  AgNP/Cand  further  characterized  using electrochemical  methods  for  possible  application  for  sensing  of  bromide. AgNP/Cproved to be highlyactive for bromide electrochemical detection.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
T1  - Electroanalytical sensing of bromides using silver nanoparticle electocatalyst
SP  - 403
EP  - 406
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9181
ER  - 

@conference{
author = "Milikić, J. and Stoševski, I. and Krstić, Jelena and Kačarević-Popović, Zorica M. and Miljanić, Šćepan S. and Šljukić, B.",
year = "2016",
abstract = "Silver nanoparticles supported on carbon (AgNP/C) were prepared by theγ–radiation  reduction  method and  characterised  using  transmission  electron microscopy  and  X–ray  diffraction.  Subsequently,  glassy  carbon  electrode was  modified  with  the  prepared  AgNP/Cand  further  characterized  using electrochemical  methods  for  possible  application  for  sensing  of  bromide. AgNP/Cproved to be highlyactive for bromide electrochemical detection.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry",
title = "Electroanalytical sensing of bromides using silver nanoparticle electocatalyst",
pages = "403-406",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9181"
}

Milikić, J., Stoševski, I., Krstić, J., Kačarević-Popović, Z. M., Miljanić, Š. S.,& Šljukić, B.. (2016). Electroanalytical sensing of bromides using silver nanoparticle electocatalyst. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry
Society of Physical Chemists of Serbia., 403-406.
https://hdl.handle.net/21.15107/rcub_vinar_9181

Milikić J, Stoševski I, Krstić J, Kačarević-Popović ZM, Miljanić ŠS, Šljukić B. Electroanalytical sensing of bromides using silver nanoparticle electocatalyst. in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry. 2016;:403-406.
https://hdl.handle.net/21.15107/rcub_vinar_9181 .

Milikić, J., Stoševski, I., Krstić, Jelena, Kačarević-Popović, Zorica M., Miljanić, Šćepan S., Šljukić, B., "Electroanalytical sensing of bromides using silver nanoparticle electocatalyst" in Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry (2016):403-406,
https://hdl.handle.net/21.15107/rcub_vinar_9181 .

TY  - JOUR
AU  - Stoševski, Ivan
AU  - Krstić, Jelena
AU  - Vokić, Nikola
AU  - Radosavljević, Miljan
AU  - Kačarević-Popović, Zorica M.
AU  - Miljanić, Šćepan S.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/799
AB  - PVA (Poly(vinyl alcohol)) matrixes were developed for potential application in electrochemical energy conversion devices, like batteries, alkaline fuel cells and electrolyzers. They were prepared by gamma-irradiation of aqueous PVA solutions, followed by different post irradiation treatments. By immersion in an electrolyte they become membranes with high ionic conductivities. The treatments were shown as the key factor determining the conductivity, through affecting their structure. An improved structure has large fractional free volume, and allows high electrolyte uptake and thus high conductivity (0.30 S cm(-1) -0.34 S cm(-1)). The structure, as well as the conductivity, has not been changed even after a period of 14 months, although the membranes have been exposed to strong alkaline medium. Besides high and long-term conductivity of the KOH doped membranes, other important properties for application in the devices were investigated, like thermal stability and gas crossover through the membranes. The 10% PVA(25kGy) membrane doped with saturated LiNO3 solution was tested in a rechargeable aqueous Li-ion battery. Due to its high conductivity it allowed an electrode material to have the same coulombic efficiency as it would have in liquid LiNO3, showing good compatibility with the material. All these properties make the memebranes attractive candidates for possible application in the electrochemical devices. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Energy
T1  - Improved Poly(vinyl alcohol) (PVA) based matrix as a potential solid electrolyte for electrochemical energy conversion devices, obtained by gamma irradiation
VL  - 90
SP  - 595
EP  - 604
DO  - 10.1016/j.energy.2015.07.096
ER  - 

@article{
author = "Stoševski, Ivan and Krstić, Jelena and Vokić, Nikola and Radosavljević, Miljan and Kačarević-Popović, Zorica M. and Miljanić, Šćepan S.",
year = "2015",
abstract = "PVA (Poly(vinyl alcohol)) matrixes were developed for potential application in electrochemical energy conversion devices, like batteries, alkaline fuel cells and electrolyzers. They were prepared by gamma-irradiation of aqueous PVA solutions, followed by different post irradiation treatments. By immersion in an electrolyte they become membranes with high ionic conductivities. The treatments were shown as the key factor determining the conductivity, through affecting their structure. An improved structure has large fractional free volume, and allows high electrolyte uptake and thus high conductivity (0.30 S cm(-1) -0.34 S cm(-1)). The structure, as well as the conductivity, has not been changed even after a period of 14 months, although the membranes have been exposed to strong alkaline medium. Besides high and long-term conductivity of the KOH doped membranes, other important properties for application in the devices were investigated, like thermal stability and gas crossover through the membranes. The 10% PVA(25kGy) membrane doped with saturated LiNO3 solution was tested in a rechargeable aqueous Li-ion battery. Due to its high conductivity it allowed an electrode material to have the same coulombic efficiency as it would have in liquid LiNO3, showing good compatibility with the material. All these properties make the memebranes attractive candidates for possible application in the electrochemical devices. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Energy",
title = "Improved Poly(vinyl alcohol) (PVA) based matrix as a potential solid electrolyte for electrochemical energy conversion devices, obtained by gamma irradiation",
volume = "90",
pages = "595-604",
doi = "10.1016/j.energy.2015.07.096"
}

Stoševski, I., Krstić, J., Vokić, N., Radosavljević, M., Kačarević-Popović, Z. M.,& Miljanić, Š. S.. (2015). Improved Poly(vinyl alcohol) (PVA) based matrix as a potential solid electrolyte for electrochemical energy conversion devices, obtained by gamma irradiation. in Energy
Elsevier., 90, 595-604.
https://doi.org/10.1016/j.energy.2015.07.096

Stoševski I, Krstić J, Vokić N, Radosavljević M, Kačarević-Popović ZM, Miljanić ŠS. Improved Poly(vinyl alcohol) (PVA) based matrix as a potential solid electrolyte for electrochemical energy conversion devices, obtained by gamma irradiation. in Energy. 2015;90:595-604.
doi:10.1016/j.energy.2015.07.096 .

Stoševski, Ivan, Krstić, Jelena, Vokić, Nikola, Radosavljević, Miljan, Kačarević-Popović, Zorica M., Miljanić, Šćepan S., "Improved Poly(vinyl alcohol) (PVA) based matrix as a potential solid electrolyte for electrochemical energy conversion devices, obtained by gamma irradiation" in Energy, 90 (2015):595-604,
https://doi.org/10.1016/j.energy.2015.07.096 . .

TY  - JOUR
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Krstić, Jelena
AU  - Jovanovic, Dragutin
AU  - Spasojević, Vuk D.
AU  - Kalagasidis Krušić, Melina
AU  - Kačarević-Popović, Zorica M.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/697
AB  - Thermo- and pH-sensitive Ag-P(NiPAAm/IA) hydrogel nanocomposites were prepared by in situ reduction of Ag+ ions with gamma irradiation. P(NiPAAm/IA) copolymer hydrogel matrices have been previously synthesized by radiation induced copolymerization. The copolymer composition was determined by elemental analysis of the dried gels, and was found to be close to that of the feed. The dependence of swelling properties and phase transitions on the IA comonomer content, temperature, pH values and presence of AgNPs were investigated. The hydrogels showed both thermo- and pH responses. By introducing small amounts of IA, swelling capacity increase, and the volume phase transition temperature (VPIT) of P(NiPAAm/IA) copolymers is transferred to higher values. Presence of AgNPs causes decrease of equilibrium swelling degree and VPIT, and allows of fine-tuning of these properties. Both the average values of compressive elastic modulus and Youngs modulus of elasticity were decreased by addition of IA as a consequence of looser structure of the network (increase in molar mass between two neighboring crosslinks and decrease in effective crosslinking density). The introduction of AgNPs promoted not only improvement of these mechanical parameters, but an improvement of stress at failure especially in the systems with the highest content of IA. In addition, Ag-P(NiPAAm/IA) hydrogel nanocomposites showed good antibacterial potentials. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - European Polymer Journal
T1  - Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation
VL  - 69
SP  - 168
EP  - 185
DO  - 10.1016/j.eurpolymj.2015.06.008
ER  - 

@article{
author = "Spasojević, Jelena P. and Radosavljević, Aleksandra and Krstić, Jelena and Jovanovic, Dragutin and Spasojević, Vuk D. and Kalagasidis Krušić, Melina and Kačarević-Popović, Zorica M.",
year = "2015",
abstract = "Thermo- and pH-sensitive Ag-P(NiPAAm/IA) hydrogel nanocomposites were prepared by in situ reduction of Ag+ ions with gamma irradiation. P(NiPAAm/IA) copolymer hydrogel matrices have been previously synthesized by radiation induced copolymerization. The copolymer composition was determined by elemental analysis of the dried gels, and was found to be close to that of the feed. The dependence of swelling properties and phase transitions on the IA comonomer content, temperature, pH values and presence of AgNPs were investigated. The hydrogels showed both thermo- and pH responses. By introducing small amounts of IA, swelling capacity increase, and the volume phase transition temperature (VPIT) of P(NiPAAm/IA) copolymers is transferred to higher values. Presence of AgNPs causes decrease of equilibrium swelling degree and VPIT, and allows of fine-tuning of these properties. Both the average values of compressive elastic modulus and Youngs modulus of elasticity were decreased by addition of IA as a consequence of looser structure of the network (increase in molar mass between two neighboring crosslinks and decrease in effective crosslinking density). The introduction of AgNPs promoted not only improvement of these mechanical parameters, but an improvement of stress at failure especially in the systems with the highest content of IA. In addition, Ag-P(NiPAAm/IA) hydrogel nanocomposites showed good antibacterial potentials. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "European Polymer Journal",
title = "Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation",
volume = "69",
pages = "168-185",
doi = "10.1016/j.eurpolymj.2015.06.008"
}

Spasojević, J. P., Radosavljević, A., Krstić, J., Jovanovic, D., Spasojević, V. D., Kalagasidis Krušić, M.,& Kačarević-Popović, Z. M.. (2015). Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation. in European Polymer Journal, 69, 168-185.
https://doi.org/10.1016/j.eurpolymj.2015.06.008

Spasojević JP, Radosavljević A, Krstić J, Jovanovic D, Spasojević VD, Kalagasidis Krušić M, Kačarević-Popović ZM. Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation. in European Polymer Journal. 2015;69:168-185.
doi:10.1016/j.eurpolymj.2015.06.008 .

Spasojević, Jelena P., Radosavljević, Aleksandra, Krstić, Jelena, Jovanovic, Dragutin, Spasojević, Vuk D., Kalagasidis Krušić, Melina, Kačarević-Popović, Zorica M., "Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation" in European Polymer Journal, 69 (2015):168-185,
https://doi.org/10.1016/j.eurpolymj.2015.06.008 . .

TY  - CONF
AU  - Krstić, Jelena
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Abazović, Nadica
AU  - Jovanović, Uroš D.
AU  - Kačarević-Popović, Zorica M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9197
AB  - Poly(vinyl alcohol)/carboxymethyl-chitosan (PVA/CMC) blend hydrogels
were synthesized by γ-radiolysis followed by freeze/thawing (FT). Previous,
the water-solubility of chitosan (CS) was obtained by γ-radiolytic acidic
degradation. CMC molecular weight characterization was performed by a
Zetasizer. The fluorescence measurements confirmed the presence of CMC
in the PVA/CMC blend hydrogels. In situ preparation of Ag nanoparticles
(AgNPs) in PVA/CMC blend hydrogel matrices has been performed
exposing hydrogels, swollen in AgNO3 solution, to γ-irradiation. The
mathematical models applied for determination swelling kinetics showed
that the initial concentrations of CMC and AgNPs directly have influence on
the swelling parameters of Ag-PVA/CMC nanocomposites. Diffusion
characteristics, determined by different diffusion models (Early Time (ET),
Late Time (LT) and Etters (E)) are less due to the presence of AgNPs.
PB  - Society of Physical Chemists of Serbia
C3  - Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Ag-pva/cmc blend hydrogel nanocomposite synthesized by γ-irradiation followed by freeze/thawing method
VL  - F-31-P
UR  - https://hdl.handle.net/21.15107/rcub_vinar_9197
ER  - 

@conference{
author = "Krstić, Jelena and Spasojević, Jelena P. and Radosavljević, Aleksandra and Abazović, Nadica and Jovanović, Uroš D. and Kačarević-Popović, Zorica M.",
year = "2014",
abstract = "Poly(vinyl alcohol)/carboxymethyl-chitosan (PVA/CMC) blend hydrogels
were synthesized by γ-radiolysis followed by freeze/thawing (FT). Previous,
the water-solubility of chitosan (CS) was obtained by γ-radiolytic acidic
degradation. CMC molecular weight characterization was performed by a
Zetasizer. The fluorescence measurements confirmed the presence of CMC
in the PVA/CMC blend hydrogels. In situ preparation of Ag nanoparticles
(AgNPs) in PVA/CMC blend hydrogel matrices has been performed
exposing hydrogels, swollen in AgNO3 solution, to γ-irradiation. The
mathematical models applied for determination swelling kinetics showed
that the initial concentrations of CMC and AgNPs directly have influence on
the swelling parameters of Ag-PVA/CMC nanocomposites. Diffusion
characteristics, determined by different diffusion models (Early Time (ET),
Late Time (LT) and Etters (E)) are less due to the presence of AgNPs.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Ag-pva/cmc blend hydrogel nanocomposite synthesized by γ-irradiation followed by freeze/thawing method",
volume = "F-31-P",
url = "https://hdl.handle.net/21.15107/rcub_vinar_9197"
}

Krstić, J., Spasojević, J. P., Radosavljević, A., Abazović, N., Jovanović, U. D.,& Kačarević-Popović, Z. M.. (2014). Ag-pva/cmc blend hydrogel nanocomposite synthesized by γ-irradiation followed by freeze/thawing method. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Society of Physical Chemists of Serbia., F-31-P.
https://hdl.handle.net/21.15107/rcub_vinar_9197

Krstić J, Spasojević JP, Radosavljević A, Abazović N, Jovanović UD, Kačarević-Popović ZM. Ag-pva/cmc blend hydrogel nanocomposite synthesized by γ-irradiation followed by freeze/thawing method. in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2014;F-31-P.
https://hdl.handle.net/21.15107/rcub_vinar_9197 .

Krstić, Jelena, Spasojević, Jelena P., Radosavljević, Aleksandra, Abazović, Nadica, Jovanović, Uroš D., Kačarević-Popović, Zorica M., "Ag-pva/cmc blend hydrogel nanocomposite synthesized by γ-irradiation followed by freeze/thawing method" in Physical chemistry 2014: 12th International Conference on Fundamental and Applied Aspects of Physical Chemistry, F-31-P (2014),
https://hdl.handle.net/21.15107/rcub_vinar_9197 .

TY  - JOUR
AU  - Marinović-Cincović, Milena
AU  - Radosavljević, Aleksandra
AU  - Krstić, Jelena
AU  - Spasojević, Jelena P.
AU  - Bibić, Nataša M.
AU  - Mitrić, Miodrag
AU  - Kačarević-Popović, Zorica M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/370
AB  - Magnetic field sensitive gels, ferrogels, are new promising class of hydrogels. The coupling of hydrogels and magnetic particles has potential application in soft actuators, such as artificial muscles, or for hyperthermia application. In this study, the composite of magnetite particles (Fe3O4) and poly(vinyl alcohol) (PVA) hydrogel is developed using gamma irradiation as a crosslinking agent. PVA and Fe3O4 were chosen due to their well-established biocompatibility, radiation crosslinking potential (PVA), mild magnetic properties and the Curie point near desired heating temperature range (Fe3O4). Physicochemical characteristics of these systems show the effect of the presence of particles in the process of radiation-induced crosslinking. Obtained PVA/Fe3O4 ferrogel composite has greater swelling capacity, activation energy of dehydration and dehydration rate compared to PVA hydrogel, crosslinked under the same conditions.
T2  - Hemijska industrija
T1  - Physicochemical characteristics of gamma irradiation crosslinked poly(vinyl alcohol)/magnetite ferrogel composite
VL  - 68
IS  - 6
SP  - 743
EP  - 753
DO  - 10.2298/HEMIND141104081M
ER  - 

@article{
author = "Marinović-Cincović, Milena and Radosavljević, Aleksandra and Krstić, Jelena and Spasojević, Jelena P. and Bibić, Nataša M. and Mitrić, Miodrag and Kačarević-Popović, Zorica M.",
year = "2014",
abstract = "Magnetic field sensitive gels, ferrogels, are new promising class of hydrogels. The coupling of hydrogels and magnetic particles has potential application in soft actuators, such as artificial muscles, or for hyperthermia application. In this study, the composite of magnetite particles (Fe3O4) and poly(vinyl alcohol) (PVA) hydrogel is developed using gamma irradiation as a crosslinking agent. PVA and Fe3O4 were chosen due to their well-established biocompatibility, radiation crosslinking potential (PVA), mild magnetic properties and the Curie point near desired heating temperature range (Fe3O4). Physicochemical characteristics of these systems show the effect of the presence of particles in the process of radiation-induced crosslinking. Obtained PVA/Fe3O4 ferrogel composite has greater swelling capacity, activation energy of dehydration and dehydration rate compared to PVA hydrogel, crosslinked under the same conditions.",
journal = "Hemijska industrija",
title = "Physicochemical characteristics of gamma irradiation crosslinked poly(vinyl alcohol)/magnetite ferrogel composite",
volume = "68",
number = "6",
pages = "743-753",
doi = "10.2298/HEMIND141104081M"
}

Marinović-Cincović, M., Radosavljević, A., Krstić, J., Spasojević, J. P., Bibić, N. M., Mitrić, M.,& Kačarević-Popović, Z. M.. (2014). Physicochemical characteristics of gamma irradiation crosslinked poly(vinyl alcohol)/magnetite ferrogel composite. in Hemijska industrija, 68(6), 743-753.
https://doi.org/10.2298/HEMIND141104081M

Marinović-Cincović M, Radosavljević A, Krstić J, Spasojević JP, Bibić NM, Mitrić M, Kačarević-Popović ZM. Physicochemical characteristics of gamma irradiation crosslinked poly(vinyl alcohol)/magnetite ferrogel composite. in Hemijska industrija. 2014;68(6):743-753.
doi:10.2298/HEMIND141104081M .

Marinović-Cincović, Milena, Radosavljević, Aleksandra, Krstić, Jelena, Spasojević, Jelena P., Bibić, Nataša M., Mitrić, Miodrag, Kačarević-Popović, Zorica M., "Physicochemical characteristics of gamma irradiation crosslinked poly(vinyl alcohol)/magnetite ferrogel composite" in Hemijska industrija, 68, no. 6 (2014):743-753,
https://doi.org/10.2298/HEMIND141104081M . .

TY  - JOUR
AU  - Krstić, Jelena
AU  - Spasojević, Jelena P.
AU  - Radosavljević, Aleksandra
AU  - Šiljegović, Milorad
AU  - Kačarević-Popović, Zorica M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5849
AB  - In this study, the potential of chitosan/poly(vinyl alcohol) (CS/PVA) blends as capping agent for stabilization of Ag-nanoparticles (Ag NPs) during their in situ gamma irradiation induced synthesis was investigated. The UV-vis absorption spectra show the surface plasmon absorption band around 410 nm, which confirms the formation of Ag-nanoparticles. It was found that the composition of CS/PVA blend affected the size of the obtained Ag-nanoparticles, as well as the parameters such as density, molar concentration and effective surface area, calculated from the experimentally obtained UV-vis absorption spectra and spectra obtained by simulation according to the Mie theory. SEM micrograph and XRD measurement indicated a spherical morphology and face centered cubic crystal structure of Ag-nanoparticles, with diameter around 12 nm. The values of optical band gap energy between valence and conduction bands (E-g), calculated from the UV-vis absorption spectra, also show dependence on the blend composition for Ag-CS/PVA colloids as well as for Ag-CS/PVA nanocomposites. (C) 2013 Elsevier Ltd. All rights reserved.
T2  - Radiation Physics and Chemistry
T1  - Optical and structural properties of radiolytically in situ synthesized silver nanoparticles stabilized by chitosan/poly(vinyl alcohol) blends
VL  - 96
SP  - 158
EP  - 166
DO  - 10.1016/j.radphyschem.2013.09.013
ER  - 

@article{
author = "Krstić, Jelena and Spasojević, Jelena P. and Radosavljević, Aleksandra and Šiljegović, Milorad and Kačarević-Popović, Zorica M.",
year = "2014",
abstract = "In this study, the potential of chitosan/poly(vinyl alcohol) (CS/PVA) blends as capping agent for stabilization of Ag-nanoparticles (Ag NPs) during their in situ gamma irradiation induced synthesis was investigated. The UV-vis absorption spectra show the surface plasmon absorption band around 410 nm, which confirms the formation of Ag-nanoparticles. It was found that the composition of CS/PVA blend affected the size of the obtained Ag-nanoparticles, as well as the parameters such as density, molar concentration and effective surface area, calculated from the experimentally obtained UV-vis absorption spectra and spectra obtained by simulation according to the Mie theory. SEM micrograph and XRD measurement indicated a spherical morphology and face centered cubic crystal structure of Ag-nanoparticles, with diameter around 12 nm. The values of optical band gap energy between valence and conduction bands (E-g), calculated from the UV-vis absorption spectra, also show dependence on the blend composition for Ag-CS/PVA colloids as well as for Ag-CS/PVA nanocomposites. (C) 2013 Elsevier Ltd. All rights reserved.",
journal = "Radiation Physics and Chemistry",
title = "Optical and structural properties of radiolytically in situ synthesized silver nanoparticles stabilized by chitosan/poly(vinyl alcohol) blends",
volume = "96",
pages = "158-166",
doi = "10.1016/j.radphyschem.2013.09.013"
}

Krstić, J., Spasojević, J. P., Radosavljević, A., Šiljegović, M.,& Kačarević-Popović, Z. M.. (2014). Optical and structural properties of radiolytically in situ synthesized silver nanoparticles stabilized by chitosan/poly(vinyl alcohol) blends. in Radiation Physics and Chemistry, 96, 158-166.
https://doi.org/10.1016/j.radphyschem.2013.09.013

Krstić J, Spasojević JP, Radosavljević A, Šiljegović M, Kačarević-Popović ZM. Optical and structural properties of radiolytically in situ synthesized silver nanoparticles stabilized by chitosan/poly(vinyl alcohol) blends. in Radiation Physics and Chemistry. 2014;96:158-166.
doi:10.1016/j.radphyschem.2013.09.013 .

Krstić, Jelena, Spasojević, Jelena P., Radosavljević, Aleksandra, Šiljegović, Milorad, Kačarević-Popović, Zorica M., "Optical and structural properties of radiolytically in situ synthesized silver nanoparticles stabilized by chitosan/poly(vinyl alcohol) blends" in Radiation Physics and Chemistry, 96 (2014):158-166,
https://doi.org/10.1016/j.radphyschem.2013.09.013 . .

TY  - JOUR
AU  - Šiljegović, Milorad
AU  - Kačarević-Popović, Zorica M.
AU  - Stchakovsky, M.
AU  - Radosavljević, Aleksandra
AU  - Korica, Sanja
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5943
AB  - The optical properties of 150 keV N+ implanted ethylene-norbornene (TOPAS 6017S-04) copolymer were investigated using phase modulated spectroscopic ellipsometry (PMSE) and ultraviolet-visible (UV-Vis) spectroscopy in the ranges of 0.6-6.5 eV and of 1.5-6.2 eV, respectively. The single-effectiveoscillator model was used to fit the calculated data to the experimental ellipsometric spectra. The results show that the oscillator and dispersion energies decrease with increasing ion fluence up to 10(15) cm(-2), and then these parameters increase with further fluence increasing. Analysis of the UV-Vis absorption spectra revealed the presence of indirect electronic transitions with the band gap energy in the range of 1.3 to 2.8 eV. It was found that both the band gap energy and the energy width of the distribution of localized band tail states decrease, while the values of Tauc coefficient increase with increasing the ion fluence. From the ellipsometric data we found that the real part of the dielectric function increased about 7% after irradiation with 10(15) cm(-2), and decreased about 10% in samples modified with 10(16) cm(-2).
T2  - Radiation Physics and Chemistry
T1  - Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films
VL  - 98
SP  - 7
EP  - 13
DO  - 10.1016/j.radphyschem.2013.12.023
ER  - 

@article{
author = "Šiljegović, Milorad and Kačarević-Popović, Zorica M. and Stchakovsky, M. and Radosavljević, Aleksandra and Korica, Sanja and Novaković, Mirjana M. and Popović, Maja",
year = "2014",
abstract = "The optical properties of 150 keV N+ implanted ethylene-norbornene (TOPAS 6017S-04) copolymer were investigated using phase modulated spectroscopic ellipsometry (PMSE) and ultraviolet-visible (UV-Vis) spectroscopy in the ranges of 0.6-6.5 eV and of 1.5-6.2 eV, respectively. The single-effectiveoscillator model was used to fit the calculated data to the experimental ellipsometric spectra. The results show that the oscillator and dispersion energies decrease with increasing ion fluence up to 10(15) cm(-2), and then these parameters increase with further fluence increasing. Analysis of the UV-Vis absorption spectra revealed the presence of indirect electronic transitions with the band gap energy in the range of 1.3 to 2.8 eV. It was found that both the band gap energy and the energy width of the distribution of localized band tail states decrease, while the values of Tauc coefficient increase with increasing the ion fluence. From the ellipsometric data we found that the real part of the dielectric function increased about 7% after irradiation with 10(15) cm(-2), and decreased about 10% in samples modified with 10(16) cm(-2).",
journal = "Radiation Physics and Chemistry",
title = "Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films",
volume = "98",
pages = "7-13",
doi = "10.1016/j.radphyschem.2013.12.023"
}

Šiljegović, M., Kačarević-Popović, Z. M., Stchakovsky, M., Radosavljević, A., Korica, S., Novaković, M. M.,& Popović, M.. (2014). Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films. in Radiation Physics and Chemistry, 98, 7-13.
https://doi.org/10.1016/j.radphyschem.2013.12.023

Šiljegović M, Kačarević-Popović ZM, Stchakovsky M, Radosavljević A, Korica S, Novaković MM, Popović M. Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films. in Radiation Physics and Chemistry. 2014;98:7-13.
doi:10.1016/j.radphyschem.2013.12.023 .

Šiljegović, Milorad, Kačarević-Popović, Zorica M., Stchakovsky, M., Radosavljević, Aleksandra, Korica, Sanja, Novaković, Mirjana M., Popović, Maja, "Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films" in Radiation Physics and Chemistry, 98 (2014):7-13,
https://doi.org/10.1016/j.radphyschem.2013.12.023 . .