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Received October 4, 2003
Accepted January 5, 2004
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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A Frequency-Dependent Surfactant Bridge Model for the Electrorheological Behaviors of Surfactant-Activated Suspensions
Faculty of Applied Chemistry, Chonnam National University, Yongbong-dong 300, Gwangju 500-757, Korea
Korean Journal of Chemical Engineering, May 2004, 21(3), 567-574(8), 10.1007/BF02705489
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Abstract
In surfactant-activated electrorheological (ER) suspensions, the ER response shows linear ER behavior (τ∝Eo2) at small surfactant concentrations and nonlinear ER behavior (τ∝Eon, n<2) at large surfactant concentrations. A surfactant bridge model was proposed to explain the nonlinear ER behavior at large surfactant concentrations with some assumptions. The proposed model successfully predicted the qualitative nonlinear ER behavior of surfactant-activated ER suspensions at large surfactant concentrations. Here, the surfactant bridge model is expanded to predict the electric field frequency dependent ER behavior of surfactant-activated ER suspensions. The developed surfactant bridge model can predict both the linear ER behavior at small surfactant concentrations and the nonlinear ER behavior at large surfactant concentrations. Furthermore, this model can predict two different types of the electric field frequency dependent ER behaviors of surfactant-activated ER suspensions, which depend on the amount of surfactants.
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