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AN INTERFACIAL POLARIZATION MODEL FOR ACTIVATED ELECTRORHEOLOGICAL SUSPENSIONS
Korean Journal of Chemical Engineering, January 1997, 14(1), 30-36(7), 10.1007/BF02706038
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Abstract
Surfactant influences the ER response in two different ways. At low surfactant concentrations, it enhances the ER response by enhancing the particle polarizability. While at large concentrations, the response degrades due to the non-linear conductivity in the continuous phase. The yield stress is proportional to the electric field strength squared at small surfactant concentrations, but increases more slowly with field strength at large concentrations. In this paper, an interfacial polarization model is introduced to predict the ER behavior of surfactant-activated ER suspensions. Maxwell-Wagner model was modified by incorporating the effects of surfactant adsorption and field-induced alteration of the surfactant structure. The modified interfacial polarization model predicts well the qualitative behavior of the surfactant activated ER suspensions over all surfactant concentration ranges.
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References
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Bonnecaze RT, Brady JF, J. Rheol., 36, 1 (1992)
Deinega YF, Vinogradov GV, Rheol. Acta, 23, 636 (1984)
Cherkova OA, Petrzhik GG, Trapeznikov AA, koll. Zhurn., 44, 83 (1982)
Dukhin SS, J. Surf. Coll. Sci., 3, 83 (1970)
Gast AP, Zukoski CF, Adv. Colloid Interface Sci., 30, 153 (1989)
Hippel AR, "Dielectric Materials and Applications," John Wiley and Sons, New York (1954)
Jackson JD, "Electrodynamics," 2nd ed., John Wiley and Sons, Inc. (1975)
Jordan TC, Shaw MT, IEEE Trans. Electr. Insul., 24, 849 (1989)
Kim YD, "Nonionic Surfactant-Activated Electrorheological Suspecsions," Ph.D. Thesis, U. of Wisconsin (1996)
Klingenberg DJ, Zukoski CF, Langmuir, 6, 15 (1990)
Klingenberg DJ, vanSwol F, Zukoski CF, J. Chem. Phys., 91, 7888 (1989)
Klingenberg DJ, vanSwol F, Zukoski CF, J. Chem. Phys., 94, 6160 (1991)
Petrzhik GG, Chertkova OA, Trapeznikov AA, Dokl. Akad. Nauk SSSR, 253, 173 (1980)
Trapeznikov AA, Petrzhik GG, Chertkova OA, Koll. Zhurn., 43, 83 (1981)
Weiss KD, Carlson JD, J. Intell. Sys. Struct., 4, 13 (1993)
Winslow WM, J. Appl. Phys., 20, 1137 (1949)
Zhu BY, Gu T, Adv. Colloid Interface Sci., 37, 1 (1991)
Zukoski CF, Annu. Rev. Mater. Sci., 23, 45 (1993)
