Electrorheological fluids comprising dielectric particulates dis

Details Electrorheological fluids comprising dielectric particulates dis Electrorheological fluids comprising dielectric particulates dis

1991-02-21

1993-10-12

Skane, Christine

Compositions

Heat-exchange, low-freezing or pour point, or high boiling...

Organic components

252 783, 252 785, 252 79, 252572, C10M17100, C10M16904

Patent

active

052522504

ABSTRACT:
The present invention relates to an electrorheological fluid which is capable of increasing viscosity under an application of electric potential difference.
An electrorheological fluid according to the present invention comprises dielectric particulates dispersed in a highly electrically insulating oily medium, in which the particulates are carbonaceous particulates having an atomic ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and an average particle size of from 0.01 to 100 .mu.m, and the oily medium is an electrical insulating oil having a dielectric constant of not less than 3 and a volume resistivity of not less than 10.sup.9 .OMEGA..multidot.cm.

REFERENCES:
patent: 3047507 (1962-07-01), Winslow
patent: 3385793 (1968-05-01), Klass et al.
patent: 4812251 (1989-03-01), Stangroom
patent: 5087382 (1992-02-01), Ishino et al.
Matsepuro, "Structure Formation in an Electric Field and the Composition of Electrorheological Suspensions", translated from Elektroreol. Issled; Pril., Minsk, pp. 27-51, 1981.
"International Cooperation on Characterization and Nomenclature of Carbon and Graphite"; Carbon, 1975, vol. I, p. 251.
"International Committee for Characterization and Terminology of Carbon First Publication of Further 24 Tentative Definitions", Carbon (1983) 21:517-519.
"Allotropes"; The Encyclopedia of Chemistry Ed. G. L. Clark, Reynold Publishing Corp., NY, N.Y., 1960, p. 45.

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