Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles

This research is focused on the development of a new magnetorheological (MR) fluid which contains maghemite (γ-Fe2O3) nanoparticles so as to improve its performance. The performance of MR fluid is presented in terms of physical and rheological properties and its application in MR device. In this wor...

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Main Author:	Nikmat Leong, Siti Asma'
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/79528/1/SitiAsmaNikmatLeongPFKM2018.pdf
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spelling	my-utm-ep.795282018-10-31T12:53:01Z Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles 2018 Nikmat Leong, Siti Asma' TJ Mechanical engineering and machinery This research is focused on the development of a new magnetorheological (MR) fluid which contains maghemite (γ-Fe2O3) nanoparticles so as to improve its performance. The performance of MR fluid is presented in terms of physical and rheological properties and its application in MR device. In this work, the γ-Fe2O3 has been synthesized using co-precipitation method and coated with oleic acid. Two types of MR fluids were prepared, bidisperse MR fluid containing carbonyl iron (CI) microparticles substituted with γ-Fe2O3 and MR fluid utilizing γ-Fe2O3 additive. MR fluid containing γ-Fe2O3 showed great improvement exhibiting reduced sedimentation rate and enhanced re-dispersibility. During the period of 50 hours, the bidisperse MR fluid with 5 wt% of γ-Fe2O3 reduced 15% of sedimentation rate and MR fluid with 1 wt% of γ-Fe2O3 additive reduced 9.6% of sedimentation rate compared to pure CI MR fluid. The rheological properties of the MR fluid were analyzed with respect to the rheological models of Bingham Plastic, Herschel Bulkley and Casson models. The rheological properties of bidisperse MR fluid revealed that the substitution of 5 wt% γ-Fe2O3 increased the yield stress by 8.5% but further substitution of γ-Fe2O3 would slightly decrease the yield stress. On the other hand, the MR fluid added with γ-Fe2O3 additive showed improvement in yield stress over the entire range of magnetic field applied. The results indicated that the addition of 1 wt% of γ-Fe2O3 in MR fluid increased the yield stress by 11.7%. The performance of MR fluid using MR valve equipped with a hydraulic bypass damper resulted in improvement of damping force when γ-Fe2O3 is added. The MR fluid with 1 wt% γ-Fe2O3 additive improved the maximum damping force up to 11.1% compared to the pure MR fluid. Therefore, the substitution and addition of γ-Fe2O3 nanoparticles in the MR fluid improved both its physical and rheological properties, hence it can potentially be used in commercial application as a simple and reliable damping device. 2018 Thesis http://eprints.utm.my/id/eprint/79528/ http://eprints.utm.my/id/eprint/79528/1/SitiAsmaNikmatLeongPFKM2018.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Nikmat Leong, Siti Asma' Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
description	This research is focused on the development of a new magnetorheological (MR) fluid which contains maghemite (γ-Fe2O3) nanoparticles so as to improve its performance. The performance of MR fluid is presented in terms of physical and rheological properties and its application in MR device. In this work, the γ-Fe2O3 has been synthesized using co-precipitation method and coated with oleic acid. Two types of MR fluids were prepared, bidisperse MR fluid containing carbonyl iron (CI) microparticles substituted with γ-Fe2O3 and MR fluid utilizing γ-Fe2O3 additive. MR fluid containing γ-Fe2O3 showed great improvement exhibiting reduced sedimentation rate and enhanced re-dispersibility. During the period of 50 hours, the bidisperse MR fluid with 5 wt% of γ-Fe2O3 reduced 15% of sedimentation rate and MR fluid with 1 wt% of γ-Fe2O3 additive reduced 9.6% of sedimentation rate compared to pure CI MR fluid. The rheological properties of the MR fluid were analyzed with respect to the rheological models of Bingham Plastic, Herschel Bulkley and Casson models. The rheological properties of bidisperse MR fluid revealed that the substitution of 5 wt% γ-Fe2O3 increased the yield stress by 8.5% but further substitution of γ-Fe2O3 would slightly decrease the yield stress. On the other hand, the MR fluid added with γ-Fe2O3 additive showed improvement in yield stress over the entire range of magnetic field applied. The results indicated that the addition of 1 wt% of γ-Fe2O3 in MR fluid increased the yield stress by 11.7%. The performance of MR fluid using MR valve equipped with a hydraulic bypass damper resulted in improvement of damping force when γ-Fe2O3 is added. The MR fluid with 1 wt% γ-Fe2O3 additive improved the maximum damping force up to 11.1% compared to the pure MR fluid. Therefore, the substitution and addition of γ-Fe2O3 nanoparticles in the MR fluid improved both its physical and rheological properties, hence it can potentially be used in commercial application as a simple and reliable damping device.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Nikmat Leong, Siti Asma'
author_facet	Nikmat Leong, Siti Asma'
author_sort	Nikmat Leong, Siti Asma'
title	Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
title_short	Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
title_full	Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
title_fullStr	Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
title_full_unstemmed	Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
title_sort	rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2018
url	http://eprints.utm.my/id/eprint/79528/1/SitiAsmaNikmatLeongPFKM2018.pdf
_version_	1747818248320057344

Rheological and stability properties of magnetorheological fluid with superparamagnetic maghemite nanoparticles

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