Materials development and properties characterization of innovative magnetorheological (MR) fluids

With the goal of developing innovative magnetorheological (MR) fluids, we performed the synthesis and characterization of new magnetic particles. With these particles, the properties of several new MR fluids were investigated. In the material synthesis, Fe304 nanoparticles have been obtained using v...

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Main Author: Yang, Yong Bo
Other Authors: Chen Guang
Format: Theses and Dissertations
Language:English
Published: 2010
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Online Access:https://hdl.handle.net/10356/41763
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-417632023-03-11T17:12:20Z Materials development and properties characterization of innovative magnetorheological (MR) fluids Yang, Yong Bo Chen Guang Li Lin School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics With the goal of developing innovative magnetorheological (MR) fluids, we performed the synthesis and characterization of new magnetic particles. With these particles, the properties of several new MR fluids were investigated. In the material synthesis, Fe304 nanoparticles have been obtained using vesicle method, the magnetite particles were encapsulated in the vesicles formed from cetyltrimethylammonium bromide (CTAB) and sodium octyl sulphate (SOS). These small particles have no sedimentation issue, but their magnetization saturation is around 60 emu/g, which is not high enough for MR fluids. To obtain particles with higher magnetization saturation, iron based Fe-M-B (M can be Co, Cr or Ni) particles were synthesized using borohydride reduction method. A maximum Ms of 153emu/g was achieved. And the particle size can be tailored from 40nm to 200nm by controlling the water/ethanol ratio ofthe solvent. The mechanical behavior of the synthesized nano-MR fluids was investigated through rheological testing under magnetic fields. It was found that the Fe-Cr-B based nanoMR fluids have the merits of both ferrofluids and conventional MR (C-MR) fluids. They have moderate yield stress, and they have good anti-sedimentation property. Based on the rheological characteristic of the nano-MR fluids, a convected Jeffrey model was used to predict their dynamic behaviors. The nano-MR fluids were obtained from a chemical method. While in a physical method, conventional MR fluids were mixed with ferrofluids. Experimentally it was found these ferrofluids based MR fluids (F-MR fluids) had comparable yield stress with C-MR fluids, while the anti-sedimentation properties were greatly improved. In addition to the magnetorheological study ofnano-MR fluids and F-MR fluids, two more topics have been particularly investigated. DOCTOR OF PHILOSOPHY (MAE) 2010-08-11T07:17:13Z 2010-08-11T07:17:13Z 2008 2008 Thesis Yang, Y. B. (2008). Materials development and properties characterization of innovative magnetorheological (MR) fluids. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/41763 10.32657/10356/41763 en 214 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Yang, Yong Bo
Materials development and properties characterization of innovative magnetorheological (MR) fluids
description With the goal of developing innovative magnetorheological (MR) fluids, we performed the synthesis and characterization of new magnetic particles. With these particles, the properties of several new MR fluids were investigated. In the material synthesis, Fe304 nanoparticles have been obtained using vesicle method, the magnetite particles were encapsulated in the vesicles formed from cetyltrimethylammonium bromide (CTAB) and sodium octyl sulphate (SOS). These small particles have no sedimentation issue, but their magnetization saturation is around 60 emu/g, which is not high enough for MR fluids. To obtain particles with higher magnetization saturation, iron based Fe-M-B (M can be Co, Cr or Ni) particles were synthesized using borohydride reduction method. A maximum Ms of 153emu/g was achieved. And the particle size can be tailored from 40nm to 200nm by controlling the water/ethanol ratio ofthe solvent. The mechanical behavior of the synthesized nano-MR fluids was investigated through rheological testing under magnetic fields. It was found that the Fe-Cr-B based nanoMR fluids have the merits of both ferrofluids and conventional MR (C-MR) fluids. They have moderate yield stress, and they have good anti-sedimentation property. Based on the rheological characteristic of the nano-MR fluids, a convected Jeffrey model was used to predict their dynamic behaviors. The nano-MR fluids were obtained from a chemical method. While in a physical method, conventional MR fluids were mixed with ferrofluids. Experimentally it was found these ferrofluids based MR fluids (F-MR fluids) had comparable yield stress with C-MR fluids, while the anti-sedimentation properties were greatly improved. In addition to the magnetorheological study ofnano-MR fluids and F-MR fluids, two more topics have been particularly investigated.
author2 Chen Guang
author_facet Chen Guang
Yang, Yong Bo
format Theses and Dissertations
author Yang, Yong Bo
author_sort Yang, Yong Bo
title Materials development and properties characterization of innovative magnetorheological (MR) fluids
title_short Materials development and properties characterization of innovative magnetorheological (MR) fluids
title_full Materials development and properties characterization of innovative magnetorheological (MR) fluids
title_fullStr Materials development and properties characterization of innovative magnetorheological (MR) fluids
title_full_unstemmed Materials development and properties characterization of innovative magnetorheological (MR) fluids
title_sort materials development and properties characterization of innovative magnetorheological (mr) fluids
publishDate 2010
url https://hdl.handle.net/10356/41763
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