TY  - JOUR
AU  - Stevanović, Sanja
AU  - Lekka, Maria
AU  - Lanzutti, Alex
AU  - Tasić, Nikola
AU  - Živković, Ljiljana
AU  - Fedrizzi, Lorenzo
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9047
AB  - Cerium-based conversion coatings have emerged as promising green alternatives to the harmful chromium-based ones, but the mechanism of corrosive protection still remains a subject of academic and industrial research. This study focuses at small scale phenomena of corrosion inhibition imparted by ceria (CeO2) to AA7075. Ceria nanoparticles were deposited from diluted and concentrated CeO2 sols by immersion. A multi-Analytical approach, combining Atomic Force microscopy (AFM), Scanning Kelvin Probe Force Microscopy, Glow Discharge Optical Emission Spectroscopy, open circuit potential and electrochemical impedance spectroscopy was employed. Deposition of ceria films led to deactivation of cathodic sites, i.e. decreased Volta potential difference, resulting in increased corrosion inhibition. In situ AFM real-Time monitoring revealed that during exposure to NaCl electrolyte, the changes in size of deposited ceria aggregates occurred: nanoparticles disintegrated/desorbed and re-deposited at the coating surface. The process was found to be dynamic in nature. Small particles size and inherent reactivity are believed to accelerate this phenomenon. Due to the greater CeO2 reservoir, this phenomenon was more pronounced with a thicker film, imparting longer term protection.
T2  - Journal of the Electrochemical Society
T1  - Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075
VL  - 167
IS  - 10
SP  - 101503
DO  - 10.1149/1945-7111/ab98af
ER  - 

@article{
author = "Stevanović, Sanja and Lekka, Maria and Lanzutti, Alex and Tasić, Nikola and Živković, Ljiljana and Fedrizzi, Lorenzo",
year = "2020",
abstract = "Cerium-based conversion coatings have emerged as promising green alternatives to the harmful chromium-based ones, but the mechanism of corrosive protection still remains a subject of academic and industrial research. This study focuses at small scale phenomena of corrosion inhibition imparted by ceria (CeO2) to AA7075. Ceria nanoparticles were deposited from diluted and concentrated CeO2 sols by immersion. A multi-Analytical approach, combining Atomic Force microscopy (AFM), Scanning Kelvin Probe Force Microscopy, Glow Discharge Optical Emission Spectroscopy, open circuit potential and electrochemical impedance spectroscopy was employed. Deposition of ceria films led to deactivation of cathodic sites, i.e. decreased Volta potential difference, resulting in increased corrosion inhibition. In situ AFM real-Time monitoring revealed that during exposure to NaCl electrolyte, the changes in size of deposited ceria aggregates occurred: nanoparticles disintegrated/desorbed and re-deposited at the coating surface. The process was found to be dynamic in nature. Small particles size and inherent reactivity are believed to accelerate this phenomenon. Due to the greater CeO2 reservoir, this phenomenon was more pronounced with a thicker film, imparting longer term protection.",
journal = "Journal of the Electrochemical Society",
title = "Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075",
volume = "167",
number = "10",
pages = "101503",
doi = "10.1149/1945-7111/ab98af"
}

Stevanović, S., Lekka, M., Lanzutti, A., Tasić, N., Živković, L.,& Fedrizzi, L.. (2020). Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075. in Journal of the Electrochemical Society, 167(10), 101503.
https://doi.org/10.1149/1945-7111/ab98af

Stevanović S, Lekka M, Lanzutti A, Tasić N, Živković L, Fedrizzi L. Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075. in Journal of the Electrochemical Society. 2020;167(10):101503.
doi:10.1149/1945-7111/ab98af .

Stevanović, Sanja, Lekka, Maria, Lanzutti, Alex, Tasić, Nikola, Živković, Ljiljana, Fedrizzi, Lorenzo, "Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075" in Journal of the Electrochemical Society, 167, no. 10 (2020):101503,
https://doi.org/10.1149/1945-7111/ab98af . .

TY  - JOUR
AU  - Zmejkoski, Danica
AU  - Spasojević, Dragica
AU  - Orlovska, Irina V.
AU  - Kozyrovska, Natalia O.
AU  - Soković, Marina
AU  - Glamočlija, Jasmina
AU  - Dmitrović, Svetlana
AU  - Matović, Branko
AU  - Tasić, Nikola B.
AU  - Maksimović, Vuk M.
AU  - Sosnin, Mikhail
AU  - Radotić, Ksenija
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7769
AB  - Lignins and lignin-derived compounds are known to have antibacterial properties. The wound healing agents in the form of dressings produce faster skin repair and decrease pain in patients. In order to create an efficient antimicrobial agent in the form of dressing in the treatment of chronic wounds, a composite hydrogel of bacterial cellulose (BC) and dehydrogenative polymer of coniferyl alcohol (DHP), BC-DHP, was designed. Novel composite showed inhibitory or bactericidal effects against selected pathogenic bacteria, including clinically isolated ones. The highest release rate of DHP was in the first hour, while after 24 h there was still slow release of small amounts of DHP from BC-DHP during 72 h monitoring. High-performance liquid chromatography coupled with mass-spectrometry showed that BC-DHP releases DHP oligomers, which are proposed to be antimicrobially active DHP fractions. Scanning electron microscopy and atomic force microscopy micrographs proved a dose-dependent interaction of DHP with BC, which resulted in a decrease of the pore number and size in the cellulose membrane. The Fourier-transform infrared absorption spectra of the BC-DHP showed that DHP was partly bound to the BC matrix. The swelling and crystallinity degree were dose-dependent. All obtained results confirmed BC-DHP composite as a promising hydrogel for wounds healing.
T2  - International Journal of Biological Macromolecules
T1  - Bacterial cellulose-lignin composite hydrogel as a promising agent in chronic wound healing
VL  - 118
SP  - 494
EP  - 503
DO  - 10.1016/j.ijbiomac.2018.06.067
ER  - 

@article{
author = "Zmejkoski, Danica and Spasojević, Dragica and Orlovska, Irina V. and Kozyrovska, Natalia O. and Soković, Marina and Glamočlija, Jasmina and Dmitrović, Svetlana and Matović, Branko and Tasić, Nikola B. and Maksimović, Vuk M. and Sosnin, Mikhail and Radotić, Ksenija",
year = "2018",
abstract = "Lignins and lignin-derived compounds are known to have antibacterial properties. The wound healing agents in the form of dressings produce faster skin repair and decrease pain in patients. In order to create an efficient antimicrobial agent in the form of dressing in the treatment of chronic wounds, a composite hydrogel of bacterial cellulose (BC) and dehydrogenative polymer of coniferyl alcohol (DHP), BC-DHP, was designed. Novel composite showed inhibitory or bactericidal effects against selected pathogenic bacteria, including clinically isolated ones. The highest release rate of DHP was in the first hour, while after 24 h there was still slow release of small amounts of DHP from BC-DHP during 72 h monitoring. High-performance liquid chromatography coupled with mass-spectrometry showed that BC-DHP releases DHP oligomers, which are proposed to be antimicrobially active DHP fractions. Scanning electron microscopy and atomic force microscopy micrographs proved a dose-dependent interaction of DHP with BC, which resulted in a decrease of the pore number and size in the cellulose membrane. The Fourier-transform infrared absorption spectra of the BC-DHP showed that DHP was partly bound to the BC matrix. The swelling and crystallinity degree were dose-dependent. All obtained results confirmed BC-DHP composite as a promising hydrogel for wounds healing.",
journal = "International Journal of Biological Macromolecules",
title = "Bacterial cellulose-lignin composite hydrogel as a promising agent in chronic wound healing",
volume = "118",
pages = "494-503",
doi = "10.1016/j.ijbiomac.2018.06.067"
}

Zmejkoski, D., Spasojević, D., Orlovska, I. V., Kozyrovska, N. O., Soković, M., Glamočlija, J., Dmitrović, S., Matović, B., Tasić, N. B., Maksimović, V. M., Sosnin, M.,& Radotić, K.. (2018). Bacterial cellulose-lignin composite hydrogel as a promising agent in chronic wound healing. in International Journal of Biological Macromolecules, 118, 494-503.
https://doi.org/10.1016/j.ijbiomac.2018.06.067

Zmejkoski D, Spasojević D, Orlovska IV, Kozyrovska NO, Soković M, Glamočlija J, Dmitrović S, Matović B, Tasić NB, Maksimović VM, Sosnin M, Radotić K. Bacterial cellulose-lignin composite hydrogel as a promising agent in chronic wound healing. in International Journal of Biological Macromolecules. 2018;118:494-503.
doi:10.1016/j.ijbiomac.2018.06.067 .

Zmejkoski, Danica, Spasojević, Dragica, Orlovska, Irina V., Kozyrovska, Natalia O., Soković, Marina, Glamočlija, Jasmina, Dmitrović, Svetlana, Matović, Branko, Tasić, Nikola B., Maksimović, Vuk M., Sosnin, Mikhail, Radotić, Ksenija, "Bacterial cellulose-lignin composite hydrogel as a promising agent in chronic wound healing" in International Journal of Biological Macromolecules, 118 (2018):494-503,
https://doi.org/10.1016/j.ijbiomac.2018.06.067 . .

TY  - JOUR
AU  - Stojadinović, Bojan
AU  - Dohčević-Mitrović, Zorana 
AU  - Stepanenko, Dimitrije
AU  - Rosić, Milena
AU  - Petronijević, Ivan M.
AU  - Tasić, Nikola B.
AU  - Ilić, Nikola
AU  - Matović, Branko
AU  - Stojanovic, Biljana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1804
AB  - We have studied Ho-doped BiFeO3 nanopowders (Bi1-xHoxFeO3, x = 0-0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x GT = 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1-xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1-xHoxFeO3 (x GT 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies.
T2  - Ceramics International
T1  - Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition
VL  - 43
IS  - 18
SP  - 16531
EP  - 16538
DO  - 10.1016/j.ceramint.2017.09.038
ER  - 

@article{
author = "Stojadinović, Bojan and Dohčević-Mitrović, Zorana  and Stepanenko, Dimitrije and Rosić, Milena and Petronijević, Ivan M. and Tasić, Nikola B. and Ilić, Nikola and Matović, Branko and Stojanovic, Biljana",
year = "2017",
abstract = "We have studied Ho-doped BiFeO3 nanopowders (Bi1-xHoxFeO3, x = 0-0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x GT = 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1-xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1-xHoxFeO3 (x GT 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies.",
journal = "Ceramics International",
title = "Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition",
volume = "43",
number = "18",
pages = "16531-16538",
doi = "10.1016/j.ceramint.2017.09.038"
}

Stojadinović, B., Dohčević-Mitrović, Z., Stepanenko, D., Rosić, M., Petronijević, I. M., Tasić, N. B., Ilić, N., Matović, B.,& Stojanovic, B.. (2017). Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition. in Ceramics International, 43(18), 16531-16538.
https://doi.org/10.1016/j.ceramint.2017.09.038

Stojadinović B, Dohčević-Mitrović Z, Stepanenko D, Rosić M, Petronijević IM, Tasić NB, Ilić N, Matović B, Stojanovic B. Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition. in Ceramics International. 2017;43(18):16531-16538.
doi:10.1016/j.ceramint.2017.09.038 .

Stojadinović, Bojan, Dohčević-Mitrović, Zorana , Stepanenko, Dimitrije, Rosić, Milena, Petronijević, Ivan M., Tasić, Nikola B., Ilić, Nikola, Matović, Branko, Stojanovic, Biljana, "Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition" in Ceramics International, 43, no. 18 (2017):16531-16538,
https://doi.org/10.1016/j.ceramint.2017.09.038 . .

TY  - JOUR
AU  - Lojpur, Vesna
AU  - Tasić, Nikola B.
AU  - Validžić, Ivana Lj.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1388
AB  - The focus of this paper was on the different behaviors in current-voltage measurements of fabricated solar cells due to variations in scan rates (the slowest 10 mV s(-1), medium 50 mV s(-1), and the fastest 100 mV s(-1)). Three different undoped and doped antimony sulfide (Sb2S3)-based hybrids solar cells were examined under standard test conditions (1 sun) as follows: indium tin oxide glass/amorphous Sb2S3-polyaniline/TiO2/polyaniline/electrolyte/aluminum; indium tin oxide glass/p-doped Sb2S3-polyaniline/amorphous Sb2S3-polyaniline/n-doped Sb2S3-polyaniline/polyaniline/electrolyte/aluminum; and indium tin oxide glass/p-doped Sb2S3-polyaniline/aSb(2)S(3)-polyaniline/n-doped Sb2S3-polyaniline/TiO2/polyaniline/electrolyte/aluminum. Different current-voltage curves changing from inverse exponential, linear to exponential ones with different rates of measurement scans at 1 sun were recorded. The obtained results also show basic cell characteristics such as fill factor, short-circuit current, efficiency, series, and shunt resistances. The highest efficiencies of all three cells were obtained at the slowest scan rate, while values of the shunt and series resistances are in agreement with the shape of the curves. On the other hand, one example of measurement at lower light intensity (55% of sun) was given, indicating more stable cell performances and the exponential shape of current-voltage curves at all scan rates.
T2  - Journal of Applied Electrochemistry
T1  - Different behaviors in current-voltage measurements of undoped and doped Sb2S3-based solar cells
VL  - 47
IS  - 1
SP  - 117
EP  - 124
DO  - 10.1007/s10800-016-1025-2
ER  - 

@article{
author = "Lojpur, Vesna and Tasić, Nikola B. and Validžić, Ivana Lj.",
year = "2017",
abstract = "The focus of this paper was on the different behaviors in current-voltage measurements of fabricated solar cells due to variations in scan rates (the slowest 10 mV s(-1), medium 50 mV s(-1), and the fastest 100 mV s(-1)). Three different undoped and doped antimony sulfide (Sb2S3)-based hybrids solar cells were examined under standard test conditions (1 sun) as follows: indium tin oxide glass/amorphous Sb2S3-polyaniline/TiO2/polyaniline/electrolyte/aluminum; indium tin oxide glass/p-doped Sb2S3-polyaniline/amorphous Sb2S3-polyaniline/n-doped Sb2S3-polyaniline/polyaniline/electrolyte/aluminum; and indium tin oxide glass/p-doped Sb2S3-polyaniline/aSb(2)S(3)-polyaniline/n-doped Sb2S3-polyaniline/TiO2/polyaniline/electrolyte/aluminum. Different current-voltage curves changing from inverse exponential, linear to exponential ones with different rates of measurement scans at 1 sun were recorded. The obtained results also show basic cell characteristics such as fill factor, short-circuit current, efficiency, series, and shunt resistances. The highest efficiencies of all three cells were obtained at the slowest scan rate, while values of the shunt and series resistances are in agreement with the shape of the curves. On the other hand, one example of measurement at lower light intensity (55% of sun) was given, indicating more stable cell performances and the exponential shape of current-voltage curves at all scan rates.",
journal = "Journal of Applied Electrochemistry",
title = "Different behaviors in current-voltage measurements of undoped and doped Sb2S3-based solar cells",
volume = "47",
number = "1",
pages = "117-124",
doi = "10.1007/s10800-016-1025-2"
}

Lojpur, V., Tasić, N. B.,& Validžić, I. Lj.. (2017). Different behaviors in current-voltage measurements of undoped and doped Sb2S3-based solar cells. in Journal of Applied Electrochemistry, 47(1), 117-124.
https://doi.org/10.1007/s10800-016-1025-2

Lojpur V, Tasić NB, Validžić IL. Different behaviors in current-voltage measurements of undoped and doped Sb2S3-based solar cells. in Journal of Applied Electrochemistry. 2017;47(1):117-124.
doi:10.1007/s10800-016-1025-2 .

Lojpur, Vesna, Tasić, Nikola B., Validžić, Ivana Lj., "Different behaviors in current-voltage measurements of undoped and doped Sb2S3-based solar cells" in Journal of Applied Electrochemistry, 47, no. 1 (2017):117-124,
https://doi.org/10.1007/s10800-016-1025-2 . .

TY  - JOUR
AU  - Vasiljević, Zorka
AU  - Luković, Miloljub D.
AU  - Nikolić, Maria Vesna
AU  - Tasić, Nikola B.
AU  - Mitrić, Miodrag
AU  - Aleksić, Obrad S.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/504
AB  - Thick films using starting nanopowders of TiO2 (anatase 99.7%) and alpha-Fe2O3 (hematite) mixed in the weight ratios 60:40 and 40:60 for thick film paste were fabricated by screen printing technology on an alumina substrate. Samples were sintered at temperatures of 800-950 degrees C for 60 min. Structural and electronic properties were analyzed by XRD and SEM analysis, UV/vis spectroscopy and current voltage analysis in view of potential application as gas sensors and anodes in photoelectrochemical cells for hydrogen generation and water splitting. XRD analysis showed that at 800 degrees C monoclinic pseudobrookite formed and anatase had transformed into rutile. Increase in sintering temperature lead to a gradual transformation of monoclinic pseudobrookite into the orthorhombic phase. SEM analysis showed that a homogenous small grain structure was obtained especially in the case of thick film samples with the 40:60 ratio of starting anatase and hematite sintered at 850 degrees C. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Nanostructured Fe2O3/TiO2 thick films: Analysis of structural and electronic properties
VL  - 41
IS  - 5
SP  - 6889
EP  - 6897
DO  - 10.1016/j.ceramint.2015.01.141
ER  - 

@article{
author = "Vasiljević, Zorka and Luković, Miloljub D. and Nikolić, Maria Vesna and Tasić, Nikola B. and Mitrić, Miodrag and Aleksić, Obrad S.",
year = "2015",
abstract = "Thick films using starting nanopowders of TiO2 (anatase 99.7%) and alpha-Fe2O3 (hematite) mixed in the weight ratios 60:40 and 40:60 for thick film paste were fabricated by screen printing technology on an alumina substrate. Samples were sintered at temperatures of 800-950 degrees C for 60 min. Structural and electronic properties were analyzed by XRD and SEM analysis, UV/vis spectroscopy and current voltage analysis in view of potential application as gas sensors and anodes in photoelectrochemical cells for hydrogen generation and water splitting. XRD analysis showed that at 800 degrees C monoclinic pseudobrookite formed and anatase had transformed into rutile. Increase in sintering temperature lead to a gradual transformation of monoclinic pseudobrookite into the orthorhombic phase. SEM analysis showed that a homogenous small grain structure was obtained especially in the case of thick film samples with the 40:60 ratio of starting anatase and hematite sintered at 850 degrees C. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Nanostructured Fe2O3/TiO2 thick films: Analysis of structural and electronic properties",
volume = "41",
number = "5",
pages = "6889-6897",
doi = "10.1016/j.ceramint.2015.01.141"
}

Vasiljević, Z., Luković, M. D., Nikolić, M. V., Tasić, N. B., Mitrić, M.,& Aleksić, O. S.. (2015). Nanostructured Fe2O3/TiO2 thick films: Analysis of structural and electronic properties. in Ceramics International, 41(5), 6889-6897.
https://doi.org/10.1016/j.ceramint.2015.01.141

Vasiljević Z, Luković MD, Nikolić MV, Tasić NB, Mitrić M, Aleksić OS. Nanostructured Fe2O3/TiO2 thick films: Analysis of structural and electronic properties. in Ceramics International. 2015;41(5):6889-6897.
doi:10.1016/j.ceramint.2015.01.141 .

Vasiljević, Zorka, Luković, Miloljub D., Nikolić, Maria Vesna, Tasić, Nikola B., Mitrić, Miodrag, Aleksić, Obrad S., "Nanostructured Fe2O3/TiO2 thick films: Analysis of structural and electronic properties" in Ceramics International, 41, no. 5 (2015):6889-6897,
https://doi.org/10.1016/j.ceramint.2015.01.141 . .