Eur. Phys. J. Appl. Phys.
Volume 48, Number 3, December 2009
|Number of page(s)||4|
|Section||Physics and Mechanics of Fluids, Microfluidics|
|Published online||04 November 2009|
Effect of mechanical abrasion in polar-molecular electrorheological fluids
Department of Physics and Surface Physics Laboratory (National Key
Laboratory), Fudan University, Shanghai 200433, P.R. China
Revised: 7 September 2009
Accepted: 7 October 2009
Published online: 4 November 2009
Mechanical abrasion is a phenomenon which commonly occurs during the application of polar-molecular electrorheological (PMER) fluids. We experimentally investigate its effect by milling PMER particles for different times. We find that this effect can significantly reduce electrorheological effects of PMER fluids made of butyrolactone-modified TiO2 particles. This reduction results from the reduced interaction between PMER particles due to the loss of polar molecules on the surface of TiO2 particles. It is further revealed that adding proper amount of suitable polar molecules to the host fluid may compensate for the reduction of yield stress which can be about 100% at high electric fields.
PACS: 47.65.Gx – Electrorheological fluids / 77.22.Ej – Polarization and depolarization / 62.20.fg – Shape-memory effect; yield stress; superelasticity
© EDP Sciences, 2009
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