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Suspension of layered particles: an optimum electrorheological fluid for d.c. applications |
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| Authors: | Ryo Sakurai Howard See Tasuku Saito Shigeo Asai Masao Sumita |
| Institution: | (1) Research and Development Division Bridgestone Corporation 3-1-1 Ogawahigashi-cho, Kodaira-shi Tokyo 187, Japan e-mail: sakura-r@bridgestone.co.jp, JP;(2) Department of Mechanical and Mechatronic Engineering The University of Sydney NSW 2006, Australia, AU;(3) Department of Organic and Polymeric Materials Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152, Japan, JP |
| Abstract: | A comparison is made between two types of solid particles used in electrorheological fluids: particles with homogeneous electrical properties versus layered particles with a semi-conducting core surrounded by an outer layer of lower conductivity. Rheological measurements of these suspensions under steady shear and d.c. electric field show that the layered particle system produces the same yield stress but with a substantially reduced electric current. X-ray spectroscopic analysis confirms that these particles have a thin layer of SiOx on the outer surface which causes the reduction in conductivity. Measurement of the dielectric permittivity followed by analysis using the Maxwell-Wagner model of polarization indicates that the conductivity of the outer layer is about 0.62 times that of the core region. Received: 13 January 1999 Accepted: 26 July 1999 |
| Keywords: | Electrorheological fluid Yield stress Current density Maxwell-Wagner polarization Layered particle |
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