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Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics

CoFe2O4 nanoparticles are synthesized through sol-gel and facile hydrothermal methods, and their magnetorheological (MR) characteristics are evaluated. X-ray diffraction results indicate the formation of single phase CoFe2O4 after the prepared samples were sintered at 550 degrees C for 2 h, which wa...

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Main Authors: Hajalilou, Abdollah, Mazlan, Saiful Amri, Abbasi, Mehrdad, Lavvafi, Hossein
Format: Article
Published: Royal SOC Chemistry 2016
Subjects:
T Technology
Online Access:http://eprints.utm.my/id/eprint/68430/
http://dx.doi.org/10.1039/c6ra13493a
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spelling my.utm.684302017-11-20T08:52:06Z http://eprints.utm.my/id/eprint/68430/ Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics Hajalilou, Abdollah Mazlan, Saiful Amri Abbasi, Mehrdad Lavvafi, Hossein T Technology CoFe2O4 nanoparticles are synthesized through sol-gel and facile hydrothermal methods, and their magnetorheological (MR) characteristics are evaluated. X-ray diffraction results indicate the formation of single phase CoFe2O4 after the prepared samples were sintered at 550 degrees C for 2 h, which was further confirmed by DSC, TG and FT-IR analysis. TEM results exhibit a narrow particle size distribution in the range of 5-40 nm with an average size of 21 nm for the samples prepared via the hydrothermal method. On the other hand, the particle size distribution was in the range of 15-120 nm and an average size of 42 nm was obtained via the sol-gel method. To prepare an MR fluid, CoFe2O4 nanoparticles were added to a micron-sized soft magnetic carbonyl iron (CI)-based suspension and MR effects were measured via rotational tests under different magnetic field strengths. The results reveal that the CoFe2O4-CI-based MR fluids present a higher yield stress with an enhanced MR effect compared to the CI-based MR fluid due to increased magnetic properties. This suggests that the CoFe2O4 nanoparticles fill the cavities of micron-sized CI particles and form chain-like structures, which orient in the direction of the applied magnetic field. On the other hand, depending on the employed synthetic route, the obtained results display slightly higher stress behaviors in the samples prepared via the hydrothermal method. The sedimentation ratio was also evaluated to further confirm the effects of the nanoparticle additive. Royal SOC Chemistry 2016-01-10 Article PeerReviewed Hajalilou, Abdollah and Mazlan, Saiful Amri and Abbasi, Mehrdad and Lavvafi, Hossein (2016) Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics. RSC Advances, 6 (92). pp. 89510-89522. ISSN 2046-2069 http://dx.doi.org/10.1039/c6ra13493a
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic T Technology
spellingShingle T Technology
Hajalilou, Abdollah
Mazlan, Saiful Amri
Abbasi, Mehrdad
Lavvafi, Hossein
Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
description CoFe2O4 nanoparticles are synthesized through sol-gel and facile hydrothermal methods, and their magnetorheological (MR) characteristics are evaluated. X-ray diffraction results indicate the formation of single phase CoFe2O4 after the prepared samples were sintered at 550 degrees C for 2 h, which was further confirmed by DSC, TG and FT-IR analysis. TEM results exhibit a narrow particle size distribution in the range of 5-40 nm with an average size of 21 nm for the samples prepared via the hydrothermal method. On the other hand, the particle size distribution was in the range of 15-120 nm and an average size of 42 nm was obtained via the sol-gel method. To prepare an MR fluid, CoFe2O4 nanoparticles were added to a micron-sized soft magnetic carbonyl iron (CI)-based suspension and MR effects were measured via rotational tests under different magnetic field strengths. The results reveal that the CoFe2O4-CI-based MR fluids present a higher yield stress with an enhanced MR effect compared to the CI-based MR fluid due to increased magnetic properties. This suggests that the CoFe2O4 nanoparticles fill the cavities of micron-sized CI particles and form chain-like structures, which orient in the direction of the applied magnetic field. On the other hand, depending on the employed synthetic route, the obtained results display slightly higher stress behaviors in the samples prepared via the hydrothermal method. The sedimentation ratio was also evaluated to further confirm the effects of the nanoparticle additive.
format Article
author Hajalilou, Abdollah
Mazlan, Saiful Amri
Abbasi, Mehrdad
Lavvafi, Hossein
author_facet Hajalilou, Abdollah
Mazlan, Saiful Amri
Abbasi, Mehrdad
Lavvafi, Hossein
author_sort Hajalilou, Abdollah
title Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
title_short Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
title_full Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
title_fullStr Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
title_full_unstemmed Fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
title_sort fabrication of spherical cofe2o4 nanoparticles with a sol-gel and hydrothermal method and their magnetorheological characteristics
publisher Royal SOC Chemistry
publishDate 2016
url http://eprints.utm.my/id/eprint/68430/
http://dx.doi.org/10.1039/c6ra13493a
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score 13.211869

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