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Electrorheological Effects of ER Gels Containing Iron Particles

Polymer Program

Montgomery T. SHAW

Department of Chemical Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269-3136, U.S.A, shawmt{at}uconnvm.uconn.edu

Electrorheological (ER) gels were prepared by aligning 5-mm iron particles in liquid-like silicone RTV prepolymers in magnetic fields while the silicone cured. The pre-cured composite was then swollen with oil to reduce the conductivity. The iron content was held at 3% by volume, while the oil content ranged up to 20% by weight. In general, the dynamic shear moduli of the aligned ER gels increased quadratically with the electric field intensity, following the empirical equation G = G₀ [1 + (E/E₀)], with 2. Observed values of G/G₀ ranged up to 2.5. When the iron-particle chains were tilted with respect to the electrical field direction, the electrorheological effect decreased. While the rate of decrease was in approximate accord with the prediction of the point-dipole assumption, the magnitudes of the ER effect were under predicted by two orders of magnitude.

Journal of Intelligent Material Systems and Structures, Vol. 12, No. 1, 57-63 (2001)
DOI: 10.1106/2VDV-2Y83-MTGY-GDFH


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