Abstract
The interrelationship between the internal structure and the rheological properties in electrorheological (ER) suspensions subjected to a dc applied field was investigated using two ER suspensions [herein termed ERF(I) and ERF(II)]. There was a remarkable difference in the internal structure between ERF(I) and ERF(II), and the ER response in ERF(II) which contained the negative fluorine ions was larger than that in ERF(I) lacking these ions. These are related to an ionic interfacial activity of dispersed particles involving the polarization of a diffuse double sheath. The effects of the voltage polarity and the gap spacing on the rheological properties in two ER suspensions were also examined. Differences in the test results were attributed to the internal structure in the suspensions. It was also shown that further promotion of the ER response in ERF(II) is obtained by installation of a metallic mesh on the electrode surface. © 2000 Scripta Technica, Electr Eng Jpn, 132(4): 9–18, 2000
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