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An electrorheological fluid wherein the discrete phase comprises a layered mixed metal hydroxide of the formulae: LimDdT(OH)(m+2d+3+na)Aan and MgxAly(OH)z and the continuous phase is a low dielectric fluid. The layered mixed metal hydroxides may be functionalized with an aliphatic carboxylic acid or

An electrorheological fluid wherein the discrete phase comprises a layered mixed metal hydroxide of the formulae: LimDdT(OH)(m+2d+3+na)Aan and MgxAly(OH)z and the continuous phase is a low dielectric fluid. The layered mixed metal hydroxides may be functionalized with an aliphatic carboxylic acid or with the reaction product of a clay and an amine salt to provide a more dispersible particulate phase. The electrorheological fluids have improved thermal stability and provide a strong response to low electric field strengths while requiring a low concentration of layered mixed metal hydroxide component.

대표청구항 ▼

A method of using an electrorheological fluid comprising: (1) making an electrical contact across an electrorheological fluid comprising: (a) a discrete phase comprising layered mixed metal hydroxide selected from the group consisting of: LimDdT(OH)(m+2d+e+na)aan and MgxAly(OH)z wherein m is 0 to a

A method of using an electrorheological fluid comprising: (1) making an electrical contact across an electrorheological fluid comprising: (a) a discrete phase comprising layered mixed metal hydroxide selected from the group consisting of: LimDdT(OH)(m+2d+e+na)aan and MgxAly(OH)z wherein m is 0 to about 1; D is a divalent metal ion selected from the group consisting of magnesium, calcium, barium, strontium, manganese, iron, cobalt, nickel copper and zinc; d is 0 to about 4; T is a metal ion selected from the group consisting of aluminum, gallium, chromium, and iron; A is a monovalent or polyvalent ion other than an hydroxyl ion; n is the valence of the anion A; a is the number of anions A in the formula; (m+2d+3+na) is equal to or greater than 3; x is on average about 1.7; y is on average about 0.5; z is on average about 5; and (b) a low dielectric constant continuous phase; and (2) applying an electrical field across the electrorheological fluid.