Effect of Cation Concentration on Electrorheological Activity of Amorphous Alumino-Silicates
Many materials have been shown to demonstrate electrorheological (ER) activity, defined specifically as materials (most commonly fluids) which undergo a dramatic increase in resistance to flow (i.e. apparent viscosity) with applied electric fields. Until recently, the most common ER fluids consisted of suspensions of nonconducting particles in nonconducting liquids with significant amounts (5–20%) of an activator (the most common and effective being water) adsorbed onto the particles.1 Such materials became known as “wet” or hydrous ER fluids. Because of the possible instabilities of the water layer, these hydrous fluids were severely limited for any large scale applications.2 Essentially any particle with sufficient amounts of water adsorbed onto it could form an ER fluid, suggesting that the ER activity was not a primary function of the particle chemistry. The function of the water in creating ER activity is still unresolved.
KeywordsShear Rate Electrical Double Layer Anomalous Dispersion Couette Cell Crystalline Aluminosilicate
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