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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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 |
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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 |
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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. |
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Article |
author |
Hajalilou, Abdollah Mazlan, Saiful Amri Abbasi, Mehrdad Lavvafi, Hossein |
author_facet |
Hajalilou, Abdollah Mazlan, Saiful Amri Abbasi, Mehrdad Lavvafi, Hossein |
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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 |
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Royal SOC Chemistry |
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2016 |
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http://eprints.utm.my/id/eprint/68430/ http://dx.doi.org/10.1039/c6ra13493a |
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