Electrorheological fluids

Details Electrorheological fluids Electrorheological fluids

C - Chemistry, Metallurgy

10

M

31/121, 253/131,

C10M 171/00 (2006.01)

Patent

CA 2029409

ABSTRACT An electrorheological fluid comprising a low dielectric constant fluid having dispersed therein a discrete phase comprising at least one of (a) a particulate solid bearing a coating of an aprotic material, or (b) a particulate LMMH, or (c) a particulate LMMH bearing a coating of an aprotic material, wherein the LMMH of (b) and (c) comprises a crystalline layered mixed metal hydroxide (LMMH) of the formulae: LimDdT(OH)(m+2d+3+na)(An)a or MgxAly(OH)z , where, in the first formula, m is the amount of lithium, if any, d is the amount of divalent metal D, T is a trivalent metal, A is an anion of valence n, and a is the amount of A, and where, in the second formula, x is the amount of magnesium, y is the amount of aluminum, and z is the amount of hydroxyl ion. The electrorheo- logical fluids have improved thermal stability and provide a strong and rapid response to low electric 37,283A-F field strengths as compared to previously known electrorheological fluids which rely on the presence of water for the response to an electric field. 37,283A-F

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