TY  - CONF
AU  - Vasiljević, Zorka Ž.
AU  - Dojčinović, Milena P.
AU  - Vujančević, Jelena
AU  - Spreitzer, Matjaž
AU  - Kovač, Janez
AU  - Janković-Čaštvan, Ivona
AU  - Bartolić, Dragana
AU  - Marković, Smilja
AU  - Tadić, Nenad
AU  - Nikolić, Maria Vesna
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/15358
AB  - Novel crystalline iron-titanate fibers were synthesized for the first time to the best of our knowledge, through a simple, low cost electrospinning method followed by calcination treatment at different temperatures (500–750 °C for 3 h and at 500 °C for 6 h and at 550 °C for 4 h). The fibers were prepared from a precursor solution containing polyvinylpyrrolidone (PVP), iron(III) nonahydrate, titanium isopropoxide, N,N-Dimethylformamide and ethanol. As spun fibers were smooth, straight, beadless and uniform forming a nonwoven fibrous mat, with an average diameter of ca. 205 nm. Upon calcination in air the PVP matrice was removed and XRD and FTIR analysis showed that the duration of the calcination process, besides the temperature, had a direct influence on phase formation. Pure phase of pseudobrookite was obtained at 600 °C, 500 °C for 6 h and at 550 °C for 4 h. In addition, the morphology of obtained nanofibers was directly affected by the calcination temperature. The surface of fibers obtained after calcination was no longer smooth and the fiber diameter decreased due to complete degradation of PVP. At 700 oC and 750 °C, fibers were thicker which can be attributed to growth of Fe2TiO5 nanoparticles and simultaneous coalescence of small particles. All samples exhibited a type IV nitrogen adsorption isotherm with a type- H3 indicating slit-shaped mesoporous structure. The BET surface areas of 500 °C for 6 h, 550 °C for 4 h and 600 °C for 3 h were estimated to be 62, 38.7 and 33.2 m2/g, respectively.
PB  - Novi Sad : Faculty of Technology
C3  - Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, 2021
T1  - Influence of calcination temperature on the structure, morphology and optical properties of electrospun pseudobrookite nanofibers
SP  - 124
EP  - 124
UR  - https://hdl.handle.net/21.15107/rcub_dais_15358
ER  - 

@conference{
author = "Vasiljević, Zorka Ž. and Dojčinović, Milena P. and Vujančević, Jelena and Spreitzer, Matjaž and Kovač, Janez and Janković-Čaštvan, Ivona and Bartolić, Dragana and Marković, Smilja and Tadić, Nenad and Nikolić, Maria Vesna",
year = "2021",
abstract = "Novel crystalline iron-titanate fibers were synthesized for the first time to the best of our knowledge, through a simple, low cost electrospinning method followed by calcination treatment at different temperatures (500–750 °C for 3 h and at 500 °C for 6 h and at 550 °C for 4 h). The fibers were prepared from a precursor solution containing polyvinylpyrrolidone (PVP), iron(III) nonahydrate, titanium isopropoxide, N,N-Dimethylformamide and ethanol. As spun fibers were smooth, straight, beadless and uniform forming a nonwoven fibrous mat, with an average diameter of ca. 205 nm. Upon calcination in air the PVP matrice was removed and XRD and FTIR analysis showed that the duration of the calcination process, besides the temperature, had a direct influence on phase formation. Pure phase of pseudobrookite was obtained at 600 °C, 500 °C for 6 h and at 550 °C for 4 h. In addition, the morphology of obtained nanofibers was directly affected by the calcination temperature. The surface of fibers obtained after calcination was no longer smooth and the fiber diameter decreased due to complete degradation of PVP. At 700 oC and 750 °C, fibers were thicker which can be attributed to growth of Fe2TiO5 nanoparticles and simultaneous coalescence of small particles. All samples exhibited a type IV nitrogen adsorption isotherm with a type- H3 indicating slit-shaped mesoporous structure. The BET surface areas of 500 °C for 6 h, 550 °C for 4 h and 600 °C for 3 h were estimated to be 62, 38.7 and 33.2 m2/g, respectively.",
publisher = "Novi Sad : Faculty of Technology",
journal = "Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, 2021",
title = "Influence of calcination temperature on the structure, morphology and optical properties of electrospun pseudobrookite nanofibers",
pages = "124-124",
url = "https://hdl.handle.net/21.15107/rcub_dais_15358"
}

Vasiljević, Z. Ž., Dojčinović, M. P., Vujančević, J., Spreitzer, M., Kovač, J., Janković-Čaštvan, I., Bartolić, D., Marković, S., Tadić, N.,& Nikolić, M. V.. (2021). Influence of calcination temperature on the structure, morphology and optical properties of electrospun pseudobrookite nanofibers. in Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, 2021
Novi Sad : Faculty of Technology., 124-124.
https://hdl.handle.net/21.15107/rcub_dais_15358

Vasiljević ZŽ, Dojčinović MP, Vujančević J, Spreitzer M, Kovač J, Janković-Čaštvan I, Bartolić D, Marković S, Tadić N, Nikolić MV. Influence of calcination temperature on the structure, morphology and optical properties of electrospun pseudobrookite nanofibers. in Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, 2021. 2021;:124-124.
https://hdl.handle.net/21.15107/rcub_dais_15358 .

Vasiljević, Zorka Ž., Dojčinović, Milena P., Vujančević, Jelena, Spreitzer, Matjaž, Kovač, Janez, Janković-Čaštvan, Ivona, Bartolić, Dragana, Marković, Smilja, Tadić, Nenad, Nikolić, Maria Vesna, "Influence of calcination temperature on the structure, morphology and optical properties of electrospun pseudobrookite nanofibers" in Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, 2021 (2021):124-124,
https://hdl.handle.net/21.15107/rcub_dais_15358 .

TY  - JOUR
AU  - Vasiljević, Zorka Ž.
AU  - Dojčinović, Milena P.
AU  - Vujančević, Jelena D.
AU  - Spreitzer, Matjaž
AU  - Kovač, Janez
AU  - Bartolić, Dragana
AU  - Marković, Smilja
AU  - Janković-Čaštvan, Ivona
AU  - Tadić, Nenad B.
AU  - Nikolić, Maria Vesna
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12338
AB  - Nanostructured Fe2TiO5 (pseudobrookite), a mixed metal oxide material holds significant promise for utilization in energy and environmental applications. However, its full application is still hindered due to the difficulty to synthesize monophasic Fe2TiO5 with high crystallinity and a large specific surface area. Herein, Fe2TiO5 nanofibers were synthesized via a versatile and low-cost electrospinning method, followed by a calcination process at different temperatures. We found a significant effect of the calcination process and its duration on the crystalline phase in the form of either pseudobrookite or pseudobrookite–hematite–rutile and the morphology of calcined nanofibers. The crystallite size increased whereas the specific surface area decreased with an increase in calcination temperature. At higher temperatures, the growth of Fe2TiO5 nanoparticles and simultaneous coalescence of small particles was noted. The highest specific surface area was obtained for the sample calcined at 500 °C for 6 h (SBET = 64.4 m2 g−1). This work opens new opportunities in the synthesis of Fe2TiO5 nanostructures using the electrospinning method and a subsequent optimized calcination process for energy-related applications.
PB  - Royal Society of Chemistry (RSC)
T2  - RSC Advances
T1  - Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe                    2                    TiO                    5                    nanofibers
SP  - 32358
EP  - 32368
VL  - 11
IS  - 51
DO  - 10.1039/D1RA05748K
UR  - https://hdl.handle.net/21.15107/rcub_dais_12338
ER  - 

@article{
author = "Vasiljević, Zorka Ž. and Dojčinović, Milena P. and Vujančević, Jelena D. and Spreitzer, Matjaž and Kovač, Janez and Bartolić, Dragana and Marković, Smilja and Janković-Čaštvan, Ivona and Tadić, Nenad B. and Nikolić, Maria Vesna",
year = "2021",
abstract = "Nanostructured Fe2TiO5 (pseudobrookite), a mixed metal oxide material holds significant promise for utilization in energy and environmental applications. However, its full application is still hindered due to the difficulty to synthesize monophasic Fe2TiO5 with high crystallinity and a large specific surface area. Herein, Fe2TiO5 nanofibers were synthesized via a versatile and low-cost electrospinning method, followed by a calcination process at different temperatures. We found a significant effect of the calcination process and its duration on the crystalline phase in the form of either pseudobrookite or pseudobrookite–hematite–rutile and the morphology of calcined nanofibers. The crystallite size increased whereas the specific surface area decreased with an increase in calcination temperature. At higher temperatures, the growth of Fe2TiO5 nanoparticles and simultaneous coalescence of small particles was noted. The highest specific surface area was obtained for the sample calcined at 500 °C for 6 h (SBET = 64.4 m2 g−1). This work opens new opportunities in the synthesis of Fe2TiO5 nanostructures using the electrospinning method and a subsequent optimized calcination process for energy-related applications.",
publisher = "Royal Society of Chemistry (RSC)",
journal = "RSC Advances",
title = "Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe                    2                    TiO                    5                    nanofibers",
pages = "32358-32368",
volume = "11",
number = "51",
doi = "10.1039/D1RA05748K",
url = "https://hdl.handle.net/21.15107/rcub_dais_12338"
}

Vasiljević, Z. Ž., Dojčinović, M. P., Vujančević, J. D., Spreitzer, M., Kovač, J., Bartolić, D., Marković, S., Janković-Čaštvan, I., Tadić, N. B.,& Nikolić, M. V.. (2021). Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe                    2                    TiO                    5                    nanofibers. in RSC Advances
Royal Society of Chemistry (RSC)., 11(51), 32358-32368.
https://doi.org/10.1039/D1RA05748K
https://hdl.handle.net/21.15107/rcub_dais_12338

Vasiljević ZŽ, Dojčinović MP, Vujančević JD, Spreitzer M, Kovač J, Bartolić D, Marković S, Janković-Čaštvan I, Tadić NB, Nikolić MV. Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe                    2                    TiO                    5                    nanofibers. in RSC Advances. 2021;11(51):32358-32368.
doi:10.1039/D1RA05748K
https://hdl.handle.net/21.15107/rcub_dais_12338 .

Vasiljević, Zorka Ž., Dojčinović, Milena P., Vujančević, Jelena D., Spreitzer, Matjaž, Kovač, Janez, Bartolić, Dragana, Marković, Smilja, Janković-Čaštvan, Ivona, Tadić, Nenad B., Nikolić, Maria Vesna, "Exploring the impact of calcination parameters on the crystal structure, morphology, and optical properties of electrospun Fe                    2                    TiO                    5                    nanofibers" in RSC Advances, 11, no. 51 (2021):32358-32368,
https://doi.org/10.1039/D1RA05748K .,
https://hdl.handle.net/21.15107/rcub_dais_12338 .

TY  - CONF
AU  - Dojčinović, Milena
AU  - Vasiljević, Zorka Ž.
AU  - Tadić, Nenad B.
AU  - Krstić, Jugoslav B.
AU  - Marković, Smilja
AU  - Spreitzer, Matjaž
AU  - Kovač, Janez
AU  - Nikolić, Maria Vesna
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/12397
AB  - NiMn2O4, with a cubic spinel structure and numerous and various applications in modern technology, were synthesized with two synthetic routes: sol-gel combustion method with glycine as fuel and electrospinning method with polyvinylpyrrolidone (PVP). Both amorphous powders from sol-gel synthesis and as-spun fibers from electrospinning synthesis were calcined, electrospun fibers at 400 °C and the sol-gel synthesized powders at 800 °C. Electrospun fibers were previously characterized with DTA-TGA to investigate the influence of thermal process on a polymer fiber.
The obtained powders were characterized accordingly. Structural analysis was done via X-ray diffraction (XRD) and results show spinel structure with no impurity. The texture and morphology was investigated via N2 physisorption and transmission electron microscopy (TEM), respectively. Chemical states of elements were investigated by X-ray photoelectron spectroscopy (XPS). The electrochemical performance of the synthesized materials as supercapacitors was tested via cyclic voltammetry (CV), electric impedance spectroscopy (EIS), and chronopotentiometry (CP) to aquire galvanostatic charge-discharge (GCD) curves. Experiments were done in 6 M KOH solution with nickel foam as a working electrode. The results show good electrochemical capacity circa 200 F/g, with the potential for further structural improvement of the materials.
PB  - Novi Sad : Faculty of Technology
C3  - Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad
T1  - Synthesis, structure and electrochemical performance of NiMn2O4
SP  - 81
EP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_dais_12397
ER  - 

@conference{
author = "Dojčinović, Milena and Vasiljević, Zorka Ž. and Tadić, Nenad B. and Krstić, Jugoslav B. and Marković, Smilja and Spreitzer, Matjaž and Kovač, Janez and Nikolić, Maria Vesna",
year = "2021",
abstract = "NiMn2O4, with a cubic spinel structure and numerous and various applications in modern technology, were synthesized with two synthetic routes: sol-gel combustion method with glycine as fuel and electrospinning method with polyvinylpyrrolidone (PVP). Both amorphous powders from sol-gel synthesis and as-spun fibers from electrospinning synthesis were calcined, electrospun fibers at 400 °C and the sol-gel synthesized powders at 800 °C. Electrospun fibers were previously characterized with DTA-TGA to investigate the influence of thermal process on a polymer fiber.
The obtained powders were characterized accordingly. Structural analysis was done via X-ray diffraction (XRD) and results show spinel structure with no impurity. The texture and morphology was investigated via N2 physisorption and transmission electron microscopy (TEM), respectively. Chemical states of elements were investigated by X-ray photoelectron spectroscopy (XPS). The electrochemical performance of the synthesized materials as supercapacitors was tested via cyclic voltammetry (CV), electric impedance spectroscopy (EIS), and chronopotentiometry (CP) to aquire galvanostatic charge-discharge (GCD) curves. Experiments were done in 6 M KOH solution with nickel foam as a working electrode. The results show good electrochemical capacity circa 200 F/g, with the potential for further structural improvement of the materials.",
publisher = "Novi Sad : Faculty of Technology",
journal = "Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad",
title = "Synthesis, structure and electrochemical performance of NiMn2O4",
pages = "81-81",
url = "https://hdl.handle.net/21.15107/rcub_dais_12397"
}

Dojčinović, M., Vasiljević, Z. Ž., Tadić, N. B., Krstić, J. B., Marković, S., Spreitzer, M., Kovač, J.,& Nikolić, M. V.. (2021). Synthesis, structure and electrochemical performance of NiMn2O4. in Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad
Novi Sad : Faculty of Technology., 81-81.
https://hdl.handle.net/21.15107/rcub_dais_12397

Dojčinović M, Vasiljević ZŽ, Tadić NB, Krstić JB, Marković S, Spreitzer M, Kovač J, Nikolić MV. Synthesis, structure and electrochemical performance of NiMn2O4. in Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad. 2021;:81-81.
https://hdl.handle.net/21.15107/rcub_dais_12397 .

Dojčinović, Milena, Vasiljević, Zorka Ž., Tadić, Nenad B., Krstić, Jugoslav B., Marković, Smilja, Spreitzer, Matjaž, Kovač, Janez, Nikolić, Maria Vesna, "Synthesis, structure and electrochemical performance of NiMn2O4" in Programme and book of abstracts / 14th ECerS Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad (2021):81-81,
https://hdl.handle.net/21.15107/rcub_dais_12397 .