Electroviscous fluid

Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components

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252572, C10M12502, C09K 300

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active

050873822

ABSTRACT:
The electroviscous fluid is a suspension composed of a finely divided dielectric solid dispersed in an electrically nonconductive oil. The viscosity of the fluid increases swiftly and reversibly under an influence of electric field applied thereto and the fluid turns to a state of plastic or solid when the influence is sufficiently strong.
The electroviscous fluid of the present invention comprises 1-60% by weight of a dispersed phase of carbonaceous particulates having average particle size of 0.01-100 micrometer, and 99-40% by weight of a continuous liquid phase of an electric insulating oil having a viscosity of 0.65-500 centistokes at room temperature.
The electroviscous fluid exhibits an excellent electroviscous effect even at a high temperature with a low electric power consumption together with maintaining the improved electroviscous effect for a long period of time.

REFERENCES:
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patent: 3047507 (1962-07-01), Winslow
Carbon vol. 3, Jun. 1965, pp. 185-193, Pergamon Press Ltd. GB; J. D. Brooks et al.: "The formation of graphitizing carbons from the liquid phase" Abstract; pp. 185-186.
Patent Abstracts of Japan, vol. 12, No. 338 (C-527) (3185) Sep. 12, 1988, p. 82 C 527; & JP-A-63 97 694 (Asahi Chem. Ind. Co. Ltd) 28-04-1988.
Patent Abstracts of Japan, vol. 13, No. 179 (C-590) (3527) Apr. 26, 10-01-1989 *Abstract*.
"International Committee for Characterization and Terminology of Carbon `First Publication of Further 24 Tentative Definitions`", Carbon vol. 21, No. 5, pp. 517-519, 1983, Great Britain.
"International Cooperation on Characterization and Nomenclature of Carbon and Graphite", Carbon, 1975, vol. 13, pp. 251-253, Pergamon Press, Great Britain.
Proceedings First International Symposium on Electrorheological Fluids, "Edited by Conrad et al., Paper 1, Materials and Mechanisms in Electro-Rheology", Block et al., pp. 1, 4, 12.

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