MAGNETORHEOLOGICAL FLUIDS AND METHODS OF MAKING AND USING THE SAME
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United States of America Patent
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Issued Date -
May 26, 2011
app pub date -
Nov 23, 2009
filing date -
Nov 23, 2009
priority date (Note) -
Abandoned
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Abstract
One embodiment includes a magnetorheological fluid having an on-state yield stress when a magnetic field is applied thereto and comprising a carrier fluid and magnetizable particles suspended in the carrier fluid, and wherein the suspension of the magnetizable particles in the carrier fluid remains essentially homogenous indefinitely in the absence of the magnetic field, and wherein the on-state yield stress of the magnetorheological fluid is greater than or equal to that of poly(alpha)olefin fluid containing the same concentration of magnetizable particles, and wherein the off-state viscosity of the magnetorheological fluid is between about 0.4 and about 12 Pascal-seconds at 40° C.
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