Ferrofluid

Details Ferrofluid Ferrofluid

1981-08-13

1983-04-26

Edmundson, F.

Compositions

Magnetic

Flaw detection or magnetic clutch

252 6254, 252 6255, C09K 500

Patent

active

043812449

ABSTRACT:
A ferrofluid comprised of composite particles comprised of polymer-enmeshed magnetic metallic particles in indefinite suspension in a carrier fluid is produced by providing a pair of electrodes formed of a composition which will produce the desired magnetic metallic particles, immersing the electrodes in an organic dielectric liquid, applying a pulsed electric potential between the electrodes adjusting the gap therebetween until there is an electric discharge eroding an electrode producing magnetic metallic particles enmeshed in polymer, recovering the magnetic material from the dielectric liquid and dispersing the magnetic material in a carrier fluid producing ferrofluid.

REFERENCES:
patent: 2018161 (1935-10-01), Weber
patent: 2772761 (1956-12-01), Janson
patent: 2804955 (1957-09-01), Gill
patent: 3228882 (1966-01-01), Harle et al.
patent: 3531413 (1970-09-01), Rosensweig
patent: 3668096 (1972-06-01), Cook
patent: 3740266 (1973-06-01), Akashi et al.
patent: 3916038 (1975-10-01), Yamaguchi et al.

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