TY  - JOUR
AU  - Hosakun, Worakan
AU  - Hosakun, Yanin
AU  - Dudić, Duško
AU  - Đoković, Vladimir
AU  - Csoka, Levente
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0142941818311358
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7864
AB  - Flexible and transparent substrate materials were fabricated by using bacterial cellulose (BC), silk fibroin protein (SF) and/or polyvinyl alcohol (PVA). The BC-SF and BC-SF-PVA films obtained were further modified by impregnation with silver nanocubes (AgNC). The influences of the silver nanocubes and white light illumination on the electric and viscoelastic properties of the films were investigated. Complex conductivity measurements showed that the films with PVA component are more sensitive to light exposure and there is an increase in conductance when the sample is illuminated. The films that contained silver nanocubes showed higher values of specific susceptance than their unmodified counterparts. DMA analyses revealed that the storage shear moduli of the films increase with addition of silver nanocubes. It was also found that the relaxation transition observed at elevated temperatures in the BC-SF-PVA-AgNC films is highly sensitive to the light exposure. Above the glass transition of PVA, both storage- and loss-shear moduli change dramatically if the sample is illuminated during the measurements with respect to the case when it was kept in the dark. © 2018
T2  - Polymer Testing
T1  - Dependence of mechanical and electrical properties of silver nanocubes impregnated bacterial cellulose-silk fibroin-polyvinyl alcohol films on light exposure
VL  - 71
SP  - 110
EP  - 114
DO  - 10.1016/j.polymertesting.2018.08.031
ER  - 

@article{
author = "Hosakun, Worakan and Hosakun, Yanin and Dudić, Duško and Đoković, Vladimir and Csoka, Levente",
year = "2018",
abstract = "Flexible and transparent substrate materials were fabricated by using bacterial cellulose (BC), silk fibroin protein (SF) and/or polyvinyl alcohol (PVA). The BC-SF and BC-SF-PVA films obtained were further modified by impregnation with silver nanocubes (AgNC). The influences of the silver nanocubes and white light illumination on the electric and viscoelastic properties of the films were investigated. Complex conductivity measurements showed that the films with PVA component are more sensitive to light exposure and there is an increase in conductance when the sample is illuminated. The films that contained silver nanocubes showed higher values of specific susceptance than their unmodified counterparts. DMA analyses revealed that the storage shear moduli of the films increase with addition of silver nanocubes. It was also found that the relaxation transition observed at elevated temperatures in the BC-SF-PVA-AgNC films is highly sensitive to the light exposure. Above the glass transition of PVA, both storage- and loss-shear moduli change dramatically if the sample is illuminated during the measurements with respect to the case when it was kept in the dark. © 2018",
journal = "Polymer Testing",
title = "Dependence of mechanical and electrical properties of silver nanocubes impregnated bacterial cellulose-silk fibroin-polyvinyl alcohol films on light exposure",
volume = "71",
pages = "110-114",
doi = "10.1016/j.polymertesting.2018.08.031"
}

Hosakun, W., Hosakun, Y., Dudić, D., Đoković, V.,& Csoka, L.. (2018). Dependence of mechanical and electrical properties of silver nanocubes impregnated bacterial cellulose-silk fibroin-polyvinyl alcohol films on light exposure. in Polymer Testing, 71, 110-114.
https://doi.org/10.1016/j.polymertesting.2018.08.031

Hosakun W, Hosakun Y, Dudić D, Đoković V, Csoka L. Dependence of mechanical and electrical properties of silver nanocubes impregnated bacterial cellulose-silk fibroin-polyvinyl alcohol films on light exposure. in Polymer Testing. 2018;71:110-114.
doi:10.1016/j.polymertesting.2018.08.031 .

Hosakun, Worakan, Hosakun, Yanin, Dudić, Duško, Đoković, Vladimir, Csoka, Levente, "Dependence of mechanical and electrical properties of silver nanocubes impregnated bacterial cellulose-silk fibroin-polyvinyl alcohol films on light exposure" in Polymer Testing, 71 (2018):110-114,
https://doi.org/10.1016/j.polymertesting.2018.08.031 . .

TY  - JOUR
AU  - Hosakun, Yanin
AU  - Halasz, Katalin
AU  - Horvath, Miklos
AU  - Csoka, Levente
AU  - Đoković, Vladimir
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1651
AB  - Bacterial cellulose (BC) was used as an active material for fabrication of the membrane for CO2 capture. The BC-membrane is further modified with silk fibroin protein and ZnO nanoparticles in order to increase the number of sites that may bind CO2. The interaction of the CO2 with the membranes was investigated by means of ATR-FTIR spectroscopy. The argon purged membranes were used as the control samples. After pressurizing the membranes in CO2 at 3 bar, FTIR spectra were recorded and compared to the spectra of the controls. The interaction of the membrane materials with CO2 were studied by examining two regions of the spectra: 740-610 cm (1) (bending vibrations of CO2) and 2400- 2320 cm (1) (asymmetric stretching vibrations of CO2). The envelope of the bending mode peak in 740-610 cm (1) region is resolved into particular peaks and the appearance of the additional line at 654 cm (1) suggested that the absorption bands of CO2 alters because of the Lewis acid- base type of interaction with membranes. The changes in the region of asymmetric stretching vibrations of CO2 were even more pronounced after pressurization. The presence of the number of different sites (active groups) for the CO2 adsorption reflected in the appearance of several additional asymmetric stretching peaks. Also, due to the entrapment of the CO2 in the membrane, a typical C=O asymmetric stretching vibration line at similar to 2340 cm (1) is shifted towards lower frequencies. The analysis of the results suggested that there is a strong interaction of CO2 with BC membrane, which is additionally improved by its modification with silk fibroin and ZnO nanoparticles. From the results of CO2 permeation experiment, the basic BC membrane, silk fibroin- modified BC membrane and ZnO nanoparticles- modified BC membrane exhibited the CO2 permeability of 2.73, 2.69 and 2.66 Barrer, respectively. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Journal
T1  - ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes
VL  - 324
SP  - 83
EP  - 92
DO  - 10.1016/j.cej.2017.05.029
ER  - 

@article{
author = "Hosakun, Yanin and Halasz, Katalin and Horvath, Miklos and Csoka, Levente and Đoković, Vladimir",
year = "2017",
abstract = "Bacterial cellulose (BC) was used as an active material for fabrication of the membrane for CO2 capture. The BC-membrane is further modified with silk fibroin protein and ZnO nanoparticles in order to increase the number of sites that may bind CO2. The interaction of the CO2 with the membranes was investigated by means of ATR-FTIR spectroscopy. The argon purged membranes were used as the control samples. After pressurizing the membranes in CO2 at 3 bar, FTIR spectra were recorded and compared to the spectra of the controls. The interaction of the membrane materials with CO2 were studied by examining two regions of the spectra: 740-610 cm (1) (bending vibrations of CO2) and 2400- 2320 cm (1) (asymmetric stretching vibrations of CO2). The envelope of the bending mode peak in 740-610 cm (1) region is resolved into particular peaks and the appearance of the additional line at 654 cm (1) suggested that the absorption bands of CO2 alters because of the Lewis acid- base type of interaction with membranes. The changes in the region of asymmetric stretching vibrations of CO2 were even more pronounced after pressurization. The presence of the number of different sites (active groups) for the CO2 adsorption reflected in the appearance of several additional asymmetric stretching peaks. Also, due to the entrapment of the CO2 in the membrane, a typical C=O asymmetric stretching vibration line at similar to 2340 cm (1) is shifted towards lower frequencies. The analysis of the results suggested that there is a strong interaction of CO2 with BC membrane, which is additionally improved by its modification with silk fibroin and ZnO nanoparticles. From the results of CO2 permeation experiment, the basic BC membrane, silk fibroin- modified BC membrane and ZnO nanoparticles- modified BC membrane exhibited the CO2 permeability of 2.73, 2.69 and 2.66 Barrer, respectively. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Journal",
title = "ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes",
volume = "324",
pages = "83-92",
doi = "10.1016/j.cej.2017.05.029"
}

Hosakun, Y., Halasz, K., Horvath, M., Csoka, L.,& Đoković, V.. (2017). ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes. in Chemical Engineering Journal, 324, 83-92.
https://doi.org/10.1016/j.cej.2017.05.029

Hosakun Y, Halasz K, Horvath M, Csoka L, Đoković V. ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes. in Chemical Engineering Journal. 2017;324:83-92.
doi:10.1016/j.cej.2017.05.029 .

Hosakun, Yanin, Halasz, Katalin, Horvath, Miklos, Csoka, Levente, Đoković, Vladimir, "ATR-FTIR study of the interaction of CO2 with bacterial cellulose-based membranes" in Chemical Engineering Journal, 324 (2017):83-92,
https://doi.org/10.1016/j.cej.2017.05.029 . .