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THE NONLINEAR BEHAVIOR OF SURFACTANT-ACTIVATED ELECTRORHEOLOGICAL SUSPENSIONS
Korean Journal of Chemical Engineering, January 1997, 14(1), 23-29(7), 10.1007/BF02706037
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Abstract
The nonlinear electrorheological （ER） behavior of nonionic surfactant-activated ER suspensions is in vestigated. The influence of three nonionic surfactants (Brij 30, GMO, and GTO) on the electrorheological (ER) response of various alumina/silicone oil suspensions shows similar behavior. The prevalent feature common to all formulations is that the yield stress, Ք0, initially increases with surfactant concentration, passes through a miximum, then decreases with surfactant concentration. The nonlinear behavior observed at large surfactant concentrations (i.e., τ0 ＝ En, where n<2) arises from field-induced phase separation of a surfactant-rich phase as opposed to field-dependent conductivity of a homogeneous continuous phase.
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References
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Block H, Kelly JP, J. Phys. D: Appl. Phys., 21, 1661 (1988)
Brosseau C, J. Appl. Phys., 70, 5544 (1991)
Davis LC, Appl. Phys. Lett., 60, 319 (1992)
Deinega YF, Vinogradov GV, Rheol. Acta, 23, 636 (1984)
Felici N, Foulc JN, Atten P, "Electrorheological Fluids: Mechanisms, Properties, Technology, and Applications," (Tao, R. and Roy, G.D. Eds.), World Scientific, Singapore, 139 (1994)
Felici N, IEEE Trans. Electr. Insul., 1, 233 (1985)
Gast AP, Zukoski CF, Adv. Colloid Interface Sci., 30, 153 (1989)
Jordan TC, Shaw MT, IEEE Trans. Electr. Insul., 24, 849 (1989)
Kim YD, "Non-ionic Surfactant-Activated Electrorheological Suspensions," Ph.D. Thesis, U. of Wisconsin (1996)
Klingenberg DJ, Zukoski CF, Langmuir, 6, 15 (1990)
Rosen MJ, "Surfactants and Interfacial Phenomena," 2nd ed., Wiley, New York (1989)
Shulman ZP, Gorodkin RG, Korobko EV, Gleb VK, J. Non-Newton. Fluid Mech., 8, 29 (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)
