TY  - CONF
AU  - Nikolić, Nataša
AU  - Porobić, Slavica
AU  - Tadić, Julijana
AU  - Vujčić, Ivica
AU  - Kojić, Marija
AU  - Lađarević, Jelena
AU  - Mijin, Dušan
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6753
AB  - Polymeric materials are widely used in the chemical and optical industries, the packaging materials industry, and biomedicine. New technologies and the search for innovative and sustainable solutions have contributed to the development of polymer sensors and smart materials. Poly(vinyl-alcohol) (PVA) is a thermoplastic polymer soluble in water. It belongs to the group of non-toxic and completely biodegradable polymers, with excellent thermal and mechanical properties. Polymer-colored films have great potential as sensor systems, primarily due to their visual color change, which makes them easy to use. Azo dyes, which are used for coloring polymer films, represent the most important class of synthetic dyes, and their exceptional properties are reflected in high extinction coefficients, as well as excellent fastness to light and wet processing. Traditionally, azo dyes are used in the food and cosmetic industries, and are also used as pH indicators.
In this work, in addition to the synthesis of azo pyridone dyes, polymeric films were also synthesized. The first series of films were synthesized based on PVA and newly synthesized azo dyes, and the sensory properties of the new films were tested. The second series of films were synthesized in order to test the films as dosimeters for γ-radiation, and for this reason, TTC was added to their synthesis. The dye used in the experiments were characterized by ATR-FTIR, NMR and UV-Vis spectra. The chemical structure of the synthesized films was analyzed by ATR-FTIR spectroscopy. The sensory properties of the film were tested in solutions of different pH values, while the possibility for application in dosimetry was tested at different doses of γ-radiation at the 60Co source. Changes in the color of the films were monitored spectrophotometrically by recording reflection spectra.
PB  - Niš : RAD Centre
C3  - Book of Abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023 Conference), June 19-25, Herceg Novi, Montenegro
T1  - Sensory properties of new films based on poly(vinyl-alcohol) and pyridone azo dyes
SP  - 180
DO  - 10.21175/rad.abstr.book.2023.32.10
ER  - 

@conference{
author = "Nikolić, Nataša and Porobić, Slavica and Tadić, Julijana and Vujčić, Ivica and Kojić, Marija and Lađarević, Jelena and Mijin, Dušan",
year = "2023",
abstract = "Polymeric materials are widely used in the chemical and optical industries, the packaging materials industry, and biomedicine. New technologies and the search for innovative and sustainable solutions have contributed to the development of polymer sensors and smart materials. Poly(vinyl-alcohol) (PVA) is a thermoplastic polymer soluble in water. It belongs to the group of non-toxic and completely biodegradable polymers, with excellent thermal and mechanical properties. Polymer-colored films have great potential as sensor systems, primarily due to their visual color change, which makes them easy to use. Azo dyes, which are used for coloring polymer films, represent the most important class of synthetic dyes, and their exceptional properties are reflected in high extinction coefficients, as well as excellent fastness to light and wet processing. Traditionally, azo dyes are used in the food and cosmetic industries, and are also used as pH indicators.
In this work, in addition to the synthesis of azo pyridone dyes, polymeric films were also synthesized. The first series of films were synthesized based on PVA and newly synthesized azo dyes, and the sensory properties of the new films were tested. The second series of films were synthesized in order to test the films as dosimeters for γ-radiation, and for this reason, TTC was added to their synthesis. The dye used in the experiments were characterized by ATR-FTIR, NMR and UV-Vis spectra. The chemical structure of the synthesized films was analyzed by ATR-FTIR spectroscopy. The sensory properties of the film were tested in solutions of different pH values, while the possibility for application in dosimetry was tested at different doses of γ-radiation at the 60Co source. Changes in the color of the films were monitored spectrophotometrically by recording reflection spectra.",
publisher = "Niš : RAD Centre",
journal = "Book of Abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023 Conference), June 19-25, Herceg Novi, Montenegro",
title = "Sensory properties of new films based on poly(vinyl-alcohol) and pyridone azo dyes",
pages = "180",
doi = "10.21175/rad.abstr.book.2023.32.10"
}

Nikolić, N., Porobić, S., Tadić, J., Vujčić, I., Kojić, M., Lađarević, J.,& Mijin, D.. (2023). Sensory properties of new films based on poly(vinyl-alcohol) and pyridone azo dyes. in Book of Abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023 Conference), June 19-25, Herceg Novi, Montenegro
Niš : RAD Centre., 180.
https://doi.org/10.21175/rad.abstr.book.2023.32.10

Nikolić N, Porobić S, Tadić J, Vujčić I, Kojić M, Lađarević J, Mijin D. Sensory properties of new films based on poly(vinyl-alcohol) and pyridone azo dyes. in Book of Abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023 Conference), June 19-25, Herceg Novi, Montenegro. 2023;:180.
doi:10.21175/rad.abstr.book.2023.32.10 .

Nikolić, Nataša, Porobić, Slavica, Tadić, Julijana, Vujčić, Ivica, Kojić, Marija, Lađarević, Jelena, Mijin, Dušan, "Sensory properties of new films based on poly(vinyl-alcohol) and pyridone azo dyes" in Book of Abstracts / Eleventh International Conference on Radiation, Natural Sciences, Medicine, Engineering, Technology and Ecology (RAD 2023 Conference), June 19-25, Herceg Novi, Montenegro (2023):180,
https://doi.org/10.21175/rad.abstr.book.2023.32.10 . .

TY  - JOUR
AU  - Mladenović Nikolić, Nataša N.
AU  - Kandić, Aleksandar B.
AU  - Trivunac, Katarina V.
AU  - Mirković, Miljana M.
AU  - Vukanac, Ivana S.
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5245
AB  - The aim of the presented research was to investigate the application possibility of wood ash and metakaolin to obtain alkali-activated materials as relatively new materials in the building industry. Thus, in order to assess the adequate use of these waste materials, structural and radiological characteristics should be considered. Until now, the focus has been on ash from thermal power plants produced by burning coal, but a large part of households in our country have individual fireplaces in which wood is used as the basic raw material; thus, it is very interesting to measure the activity concentration of radionuclide in wood ash as well as the possibility of reusing that ash for other purposes. All materials were studied, in terms of physical and chemical characteristics, by methods such as X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, and scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS). XRD measurements of wood ash samples showed that it consists of calcite and larnite. FTIR spectroscopy revealed a polymeric Si–O–Al framework in alkali-activated materials and Si–O bonding bands corresponding to silicon dioxide. Determination of radionuclide content was performed by means of gamma-ray spectrometry. Results showed that the alkaline activation process led to the decrease in the activity concentration of radionuclides detected in the measured samples. External radiation hazard index (Hex) for wood ash was reduced by more than 50% after alkali activation. The results of activity concentration measurements in alkali-activated materials indicate potential for their safe application in building construction.
PB  - MDPI
T2  - Sustainability (Switzerland)
T1  - Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends
IS  - 20
SP  - 12960
VL  - 14
DO  - 10.3390/su142012960
ER  - 

@article{
author = "Mladenović Nikolić, Nataša N. and Kandić, Aleksandar B. and Trivunac, Katarina V. and Mirković, Miljana M. and Vukanac, Ivana S. and Nenadović, Snežana S. and Kljajević, Ljiljana M.",
year = "2022",
abstract = "The aim of the presented research was to investigate the application possibility of wood ash and metakaolin to obtain alkali-activated materials as relatively new materials in the building industry. Thus, in order to assess the adequate use of these waste materials, structural and radiological characteristics should be considered. Until now, the focus has been on ash from thermal power plants produced by burning coal, but a large part of households in our country have individual fireplaces in which wood is used as the basic raw material; thus, it is very interesting to measure the activity concentration of radionuclide in wood ash as well as the possibility of reusing that ash for other purposes. All materials were studied, in terms of physical and chemical characteristics, by methods such as X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, and scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS). XRD measurements of wood ash samples showed that it consists of calcite and larnite. FTIR spectroscopy revealed a polymeric Si–O–Al framework in alkali-activated materials and Si–O bonding bands corresponding to silicon dioxide. Determination of radionuclide content was performed by means of gamma-ray spectrometry. Results showed that the alkaline activation process led to the decrease in the activity concentration of radionuclides detected in the measured samples. External radiation hazard index (Hex) for wood ash was reduced by more than 50% after alkali activation. The results of activity concentration measurements in alkali-activated materials indicate potential for their safe application in building construction.",
publisher = "MDPI",
journal = "Sustainability (Switzerland)",
title = "Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends",
number = "20",
pages = "12960",
volume = "14",
doi = "10.3390/su142012960"
}

Mladenović Nikolić, N. N., Kandić, A. B., Trivunac, K. V., Mirković, M. M., Vukanac, I. S., Nenadović, S. S.,& Kljajević, L. M.. (2022). Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends. in Sustainability (Switzerland)
MDPI., 14(20), 12960.
https://doi.org/10.3390/su142012960

Mladenović Nikolić NN, Kandić AB, Trivunac KV, Mirković MM, Vukanac IS, Nenadović SS, Kljajević LM. Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends. in Sustainability (Switzerland). 2022;14(20):12960.
doi:10.3390/su142012960 .

Mladenović Nikolić, Nataša N., Kandić, Aleksandar B., Trivunac, Katarina V., Mirković, Miljana M., Vukanac, Ivana S., Nenadović, Snežana S., Kljajević, Ljiljana M., "Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends" in Sustainability (Switzerland), 14, no. 20 (2022):12960,
https://doi.org/10.3390/su142012960 . .