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28 results on '"Špitalský, Zdeno"'

4. Highly Efficient Antibacterial Polymer Composites Based on Hydrophobic Riboflavin Carbon Polymerized Dots

Author

Marković, Zoran M., primary, Kováčová, Mária, additional, Jeremić, Sanja R., additional, Nagy, Štefan, additional, Milivojević, Dušan D., additional, Kubat, Pavel, additional, Kleinová, Angela, additional, Budimir, Milica D., additional, Mojsin, Marija M., additional, Stevanović, Milena J., additional, Annušová, Adriana, additional, Špitalský, Zdeno, additional, and Todorović Marković, Biljana M., additional

Published
2022
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7. Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites

Author

Paszkiewicz Sandra, Nachman Małgorzata, Szymczyk Anna, Špitalský Zdeno, Mosnáček Jaroslav, and Rosłaniec Zbigniew

Subjects
in situ polymerization, pet, graphene oxide, expanded graphite, Chemistry, QD1-999
Abstract

This work is the continuation and refinement of already published communications based on PET/EG nanocomposites prepared by in situ polymerization1, 2. In this study, nanocomposites based on poly(ethylene terephthalate) with expanded graphite were compared to those with functionalized graphite sheets (GO). The results suggest that the degree of dispersion of nanoparticles in the PET matrix has important effect on the structure and physical properties of the nanocomposites. The existence of graphene sheets nanoparticles enhances the crystallization rate of PET. It has been confirmed that in situ polymerization is the effective method for preparation nanocomposites which can avoid the agglomeration of nanoparticles in polymer matrices and improve the interfacial interaction between nanofiller and polymer matrix. The obtained results have shown also that due to the presence of functional groups on GO surface the interactions with PET matrix can be stronger than in the case of exfoliated graphene (EG) and matrix.

Published
2014
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8. Photoactive graphene quantum dots/bacterial cellulose hydrogels: Structural, mechanical, and pro‐oxidant study

Author

Marković, Zoran M., primary, Zmejkoski, Danica Z., additional, Budimir, Milica D., additional, Bugárová, Nikol, additional, Kleinová, Angela, additional, Kuzman, Sanja B., additional, Špitalský, Zdeno, additional, Pavlović, Vladimir B., additional, Milivojević, Dušan D., additional, and Todorović Marković, Biljana M., additional

Published
2021
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12. Photoactive graphene quantum dots/bacterial cellulose hydrogels: Structural, mechanical, and pro‐oxidant study.

Author

Marković, Zoran M., Zmejkoski, Danica Z., Budimir, Milica D., Bugárová, Nikol, Kleinová, Angela, Kuzman, Sanja B., Špitalský, Zdeno, Pavlović, Vladimir B., Milivojević, Dušan D., and Todorović Marković, Biljana M.

Subjects
QUANTUM dots, REACTIVE oxygen species, SCANNING transmission electron microscopy, DYNAMIC mechanical analysis, FOURIER transform infrared spectroscopy, ELECTRON paramagnetic resonance
Abstract

Due to their unique structural properties bacterial cellulose (BC) hydrogels find possible usage in many fields such as cosmetology, food industry, or medicine. In this study, photoactive BC hydrogels are investigated through modifications of their structural, mechanical, and pro‐oxidant properties resulting from graphene quantum dots (GQDs) encapsulation. Detailed structural analysis is conducted by atomic force microscopy, transmission electron microscopy and scanning electron microscopy, X‐ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and X‐ray diffraction method. Dynamic mechanical analysis is performed to study the changes in storage modulus, loss modulus and tan δ. Pro‐oxidative properties of new designed composites are tested by electron paramagnetic resonance (EPR). Structural and mechanical analyses show successful encapsulation of GQDs into BC whereas EPR measurements indicate high potential of these composites for singlet oxygen production. [ABSTRACT FROM AUTHOR]

Published
2022
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13. Bactericidal and antioxidant bacterial cellulose hydrogels doped with chitosan as potential urinary tract infection biomedical agent

Author

Zmejkoski, Danica Z., primary, Marković, Zoran M., additional, Zdravković, Nemanja M., additional, Trišić, Dijana D., additional, Budimir, Milica D., additional, Kuzman, Sanja B., additional, Kozyrovska, Natalia O., additional, Orlovska, Iryna V., additional, Bugárová, Nikol, additional, Petrović, Đorđe Ž., additional, Kováčová, Mária, additional, Kleinová, Angela, additional, Špitalský, Zdeno, additional, Pavlović, Vladimir B., additional, and Todorović Marković, Biljana M., additional

Published
2021
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14. Corrigendum “antibacterial photodynamic activity of carbon quantum dots/polydimethylsiloxane nanocomposites against Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae” [photodiagnosis. photodyn. ther. 26 (2019) 342–349]

Author

Marković, Zoran M., primary, Kováčová, Mária, additional, Humpolíček, Petr, additional, Budimir, Milica D., additional, Vajďák, Jan, additional, Kubát, Pavel, additional, Mičušík, Matej, additional, Švajdlenková, Helena, additional, Danko, Martin, additional, Capáková, Zdenka, additional, Lehocký, Marián, additional, Todorović Marković, Biljana M., additional, and Špitalský, Zdeno, additional

Published
2020
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15. Erratum: Gamma ray assisted modification of carbon quantum dot/polyurethane nanocomposites: structural, mechanical and photocatalytic study

Author

Budimir, Milica, Marković, Zoran M., Jovanović, Dragana J., Vujisić, Miloš, Mičušík, Matej, Danko, Martin, Kleinová, Angela, Švajdlenková, Helena, Špitalský, Zdeno, and Todorović-Marković, Biljana

Abstract

Correction for ‘Gamma ray assisted modification of carbon quantum dot/polyurethane nanocomposites: structural, mechanical and photocatalytic study’ by Milica Budimir et al., RSC Adv., 2019, 9, 6278–6286. Erratum in the article: [https://vinar.vin.bg.ac.rs/handle/123456789/8086]

Published
2020

16. Highly Efficient Antioxidant F- and Cl-Doped Carbon Quantum Dots for Bioimaging

Author

Marković, Zoran M., primary, Labudová, Martina, additional, Danko, Martin, additional, Matijašević, Danka, additional, Mičušík, Matej, additional, Nádaždy, Vojtech, additional, Kováčová, Mária, additional, Kleinová, Angela, additional, Špitalský, Zdeno, additional, Pavlović, Vladimir, additional, Milivojević, Dušan D., additional, Medić, Mina, additional, and Todorović Marković, Biljana M., additional

Published
2020
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19. Correction: Gamma ray assisted modification of carbon quantum dot/polyurethane nanocomposites: structural, mechanical and photocatalytic study

Author

Budimir, Milica, primary, Marković, Zoran, additional, Jovanović, Dragana, additional, Vujisić, Miloš, additional, Mičušík, Matej, additional, Danko, Martin, additional, Kleinová, Angela, additional, Švajdlenková, Helena, additional, Špitalský, Zdeno, additional, and Marković, Biljana Todorović, additional

Published
2020
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20. Antibacterial photodynamic activity of carbon quantum dots/polydimethylsiloxane nanocomposites against Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae

Author

Marković, Zoran M., primary, Kováčová, Mária, additional, Humpolíček, Petr, additional, Budimir, Milica D., additional, Vajďák, Jan, additional, Kubát, Pavel, additional, Mičušík, Matej, additional, Švajdlenková, Helena, additional, Danko, Martin, additional, Capáková, Zdenka, additional, Lehocký, Marián, additional, Todorović Marković, Biljana M., additional, and Špitalský, Zdeno, additional

Published
2019
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21. Gamma ray assisted modification of carbon quantum dot/polyurethane nanocomposites: structural, mechanical and photocatalytic study

Author

Budimir, Milica, primary, Marković, Zoran, additional, Jovanović, Dragana, additional, Vujisić, Miloš, additional, Mičušík, Matej, additional, Danko, Martin, additional, Kleinová, Angela, additional, Švajdlenková, Helena, additional, Špitalský, Zdeno, additional, and Marković, Biljana Todorović, additional

Published
2019
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23. Carbon Quantum Dots Modified Polyurethane Nanocomposite as Effective Photocatalytic and Antibacterial Agents

Author

Kováčová, Mária, primary, Marković, Zoran M., additional, Humpolíček, Petr, additional, Mičušík, Matej, additional, Švajdlenková, Helena, additional, Kleinová, Angela, additional, Danko, Martin, additional, Kubát, Pavel, additional, Vajďák, Jan, additional, Capáková, Zdenka, additional, Lehocký, Marián, additional, Münster, Lukaš, additional, Todorović Marković, Biljana M., additional, and Špitalský, Zdeno, additional

Published
2018
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24. Photo-induced antibacterial activity of four graphene based nanomaterials on a wide range of bacteria

Author

Marković, Zoran M., primary, Jovanović, Svetlana P., additional, Mašković, Pavle Z., additional, Danko, Martin, additional, Mičušík, Matej, additional, Pavlović, Vladimir B., additional, Milivojević, Dušan D., additional, Kleinová, Angela, additional, Špitalský, Zdeno, additional, and Todorović Marković, Biljana M., additional

Published
2018
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26. Superhydrophobic Polyester/Cotton Fabrics Modified by Barrier Discharge Plasma and Organosilanes.

Author

Novák, Igor, Valentin, Marian, Špitalský, Zdeno, Popelka, Anton, Sestak, Jozef, and Krupa, Igor

Subjects
POLYESTER fibers, SUPERHYDROPHOBIC surfaces, COTTON textiles, SILANE compounds, SURFACE chemistry
Abstract

In this paper, diffuse coplanar surface barrier discharge plasma at atmospheric pressure has been used for surface modification of polyester/cotton (PESc) fabric, which was subsequently modified by sol–gel process using suitable organofunctional silanes to enhance its hydrophobicity. Modified PESc fabric surfaces were conditioned during the gelling process to obtain the permanent hydrophobicity. The contact angle of water before washing of plasma and sol–gel pretreated PESc fabric was found to be 154° and 151° after standardized washings. It was also demonstrated that the process is applicable at the industrial scale. [ABSTRACT FROM AUTHOR]

Published
2018
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28. Structural, mechanical, and antibacterial features of curcumin/polyurethane nanocomposites.

Author

Kováčová, Mária, Mičušík, Matej, Danko, Martin, Švajdlenková, Helena, Kleinová, Angela, Špitalský, Zdeno, Marković, Zoran, Marković, Biljana Todorović, Humpolíček, Petr, and Lehocký, Marián

Subjects
CURCUMIN, POLYURETHANES, DYNAMIC mechanical analysis, SOLID-liquid interfaces, ANTIBACTERIAL agents, SILVER nanoparticles
Abstract

Various types of bacteria inhabit many surfaces thus causing problems which can have very strong impact on human health. Here we present a study of photophysical, mechanical, and antibacterial properties of curcumin/polyurethane nanocomposites prepared by swell‐encapsulation‐shrink method. The prepared nanocomposites have been characterized for degree of swelling, surface morphology, mechanical properties, chemical contents, photoluminescence, hydrophobicity, potentials for singlet oxygen generation, and antibacterial activity. Dynamic mechanical analysis has shown slight changes of glass temperature of curcumin/polyurethane nanocomposites due to blue light irradiation. It was found that nanocomposites have very strong photoluminescence, become photoactive upon blue light irradiation at 470 nm and generate singlet oxygen. Conducted antibacterial tests have shown very strong activity of these nanocomposites especially toward Escherichia coli. These bacteria strains have been eliminated completely only after 1 h irradiation by blue light. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47283. [ABSTRACT FROM AUTHOR]

Published
2019
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