TY  - JOUR
AU  - Grujić, Aleksandar
AU  - Ćosović, Vladan
AU  - Stajić-Trošić, Jasna
AU  - Ćosović, Aleksandar
AU  - Stijepović, Mirko
AU  - Putić, Lana
AU  - Žák, Tomáš
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4747
AB  - In this study, electrospinning combined with sol-gel technique is applied in order to produce magnetic nickel ferrite (Ni-ferrite) nanofibers. The prepared Ni-ferrite gel was mixed with poly(vinylpyrrolidone) (PVP) solution which was used as a spinning aid to enable spinnability of the mixture. Structural and morphological characteristics of the asspun ferrite gel/PVP composite web structure and calcinated Ni-ferrite nanofibers were analyzed using scanning electron microscopy (SEM). Phase composition analysis was carried out by Fourier-transform infrared (FT-IR) spectroscopy, X-Ray diffraction analysis (XRD) and Fe-57 Mossbauer spectroscopy (MS). The obtained results suggest that the pure nanocrystalline NiFe2O4 dense mat to the almost coral-like structure of fibers with diameters ranging from hundreds of nanometers to few micrometers was obtained. The results of MS analysis revealed the existence of a crystallite size distribution within the material as well as the existence of a superparamagnetic fraction with very small crystallite sizes (<13nm). Magnetic behavior of the obtained material at elevated temperatures was also scrutinized using thermomagnetic measurements (TM) up to 800 degrees C.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
T2  - Metallurgical & Materials Engineering
T1  - Synthesis of NiFe2O4 nanofibers by joint sol-gel and electrospinning technique
VL  - 24
IS  - 3
SP  - 173
EP  - 180
DO  - 10.30544/387
ER  - 

@article{
author = "Grujić, Aleksandar and Ćosović, Vladan and Stajić-Trošić, Jasna and Ćosović, Aleksandar and Stijepović, Mirko and Putić, Lana and Žák, Tomáš",
year = "2018",
abstract = "In this study, electrospinning combined with sol-gel technique is applied in order to produce magnetic nickel ferrite (Ni-ferrite) nanofibers. The prepared Ni-ferrite gel was mixed with poly(vinylpyrrolidone) (PVP) solution which was used as a spinning aid to enable spinnability of the mixture. Structural and morphological characteristics of the asspun ferrite gel/PVP composite web structure and calcinated Ni-ferrite nanofibers were analyzed using scanning electron microscopy (SEM). Phase composition analysis was carried out by Fourier-transform infrared (FT-IR) spectroscopy, X-Ray diffraction analysis (XRD) and Fe-57 Mossbauer spectroscopy (MS). The obtained results suggest that the pure nanocrystalline NiFe2O4 dense mat to the almost coral-like structure of fibers with diameters ranging from hundreds of nanometers to few micrometers was obtained. The results of MS analysis revealed the existence of a crystallite size distribution within the material as well as the existence of a superparamagnetic fraction with very small crystallite sizes (<13nm). Magnetic behavior of the obtained material at elevated temperatures was also scrutinized using thermomagnetic measurements (TM) up to 800 degrees C.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical & Materials Engineering",
title = "Synthesis of NiFe2O4 nanofibers by joint sol-gel and electrospinning technique",
volume = "24",
number = "3",
pages = "173-180",
doi = "10.30544/387"
}

Grujić, A., Ćosović, V., Stajić-Trošić, J., Ćosović, A., Stijepović, M., Putić, L.,& Žák, T.. (2018). Synthesis of NiFe2O4 nanofibers by joint sol-gel and electrospinning technique. in Metallurgical & Materials Engineering
Belgrade : Association of Metallurgical Engineers of Serbia., 24(3), 173-180.
https://doi.org/10.30544/387

Grujić A, Ćosović V, Stajić-Trošić J, Ćosović A, Stijepović M, Putić L, Žák T. Synthesis of NiFe2O4 nanofibers by joint sol-gel and electrospinning technique. in Metallurgical & Materials Engineering. 2018;24(3):173-180.
doi:10.30544/387 .

Grujić, Aleksandar, Ćosović, Vladan, Stajić-Trošić, Jasna, Ćosović, Aleksandar, Stijepović, Mirko, Putić, Lana, Žák, Tomáš, "Synthesis of NiFe2O4 nanofibers by joint sol-gel and electrospinning technique" in Metallurgical & Materials Engineering, 24, no. 3 (2018):173-180,
https://doi.org/10.30544/387 . .

TY  - JOUR
AU  - Ćosović, Vladan
AU  - Ćosović, Aleksandar
AU  - Talijan, Nadežda M.
AU  - Živković, Dragana
AU  - Manasijević, Dragan
AU  - Minić, Duško
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1327
AB  - Considering that improvement in the performance of Ag-SnO2 electrical contact materials can be realized by an increase in metal oxide dispersion, the influence of SnO2 nanoparticles and method of their introduction in silver matrix on microstructure and physical properties such as density, porosity, hardness and electrical conductivity were studied. The SnO2 nanoparticles were introduced by conventional powder mixing and by template method using filter paper and soluble starch as templates. All investigated samples were produced by subsequent pressing, sintering of the obtained powder mixtures and composites followed by mechanical treatment. Microstructural analysis revealed that the Ag-SnO2 samples prepared by template method exhibit finer dispersion than their conventionally prepared counterpart. After sintering and forging those samples were found to have higher hardness, density and lower porosity. As a result of greater dispersion hardening, the highest value of hardness was measured for the sample prepared using soluble starch as a template. The measured values of electrical conductivity of all investigated samples are comp arable with conductivities of Ag-SnO2 electrical contact materials of this type.
PB  - Elsevier
T2  - Journal of Alloys and Compounds
T1  - Improving dispersion of SnO2 nanoparticles in Ag-SnO2 electrical contact materials using template method
VL  - 567
SP  - 33
EP  - 39
DO  - 10.1016/j.jallcom.2013.03.094
ER  - 

@article{
author = "Ćosović, Vladan and Ćosović, Aleksandar and Talijan, Nadežda M. and Živković, Dragana and Manasijević, Dragan and Minić, Duško",
year = "2013",
abstract = "Considering that improvement in the performance of Ag-SnO2 electrical contact materials can be realized by an increase in metal oxide dispersion, the influence of SnO2 nanoparticles and method of their introduction in silver matrix on microstructure and physical properties such as density, porosity, hardness and electrical conductivity were studied. The SnO2 nanoparticles were introduced by conventional powder mixing and by template method using filter paper and soluble starch as templates. All investigated samples were produced by subsequent pressing, sintering of the obtained powder mixtures and composites followed by mechanical treatment. Microstructural analysis revealed that the Ag-SnO2 samples prepared by template method exhibit finer dispersion than their conventionally prepared counterpart. After sintering and forging those samples were found to have higher hardness, density and lower porosity. As a result of greater dispersion hardening, the highest value of hardness was measured for the sample prepared using soluble starch as a template. The measured values of electrical conductivity of all investigated samples are comp arable with conductivities of Ag-SnO2 electrical contact materials of this type.",
publisher = "Elsevier",
journal = "Journal of Alloys and Compounds",
title = "Improving dispersion of SnO2 nanoparticles in Ag-SnO2 electrical contact materials using template method",
volume = "567",
pages = "33-39",
doi = "10.1016/j.jallcom.2013.03.094"
}

Ćosović, V., Ćosović, A., Talijan, N. M., Živković, D., Manasijević, D.,& Minić, D.. (2013). Improving dispersion of SnO2 nanoparticles in Ag-SnO2 electrical contact materials using template method. in Journal of Alloys and Compounds
Elsevier., 567, 33-39.
https://doi.org/10.1016/j.jallcom.2013.03.094

Ćosović V, Ćosović A, Talijan NM, Živković D, Manasijević D, Minić D. Improving dispersion of SnO2 nanoparticles in Ag-SnO2 electrical contact materials using template method. in Journal of Alloys and Compounds. 2013;567:33-39.
doi:10.1016/j.jallcom.2013.03.094 .

Ćosović, Vladan, Ćosović, Aleksandar, Talijan, Nadežda M., Živković, Dragana, Manasijević, Dragan, Minić, Duško, "Improving dispersion of SnO2 nanoparticles in Ag-SnO2 electrical contact materials using template method" in Journal of Alloys and Compounds, 567 (2013):33-39,
https://doi.org/10.1016/j.jallcom.2013.03.094 . .