Stable ferrofluid composition and method of making and using sam

Details Stable ferrofluid composition and method of making and using sam Stable ferrofluid composition and method of making and using sam

1985-05-21

1986-08-05

Demers, Arthur P.

Compositions

Magnetic

Flaw detection or magnetic clutch

252 6251, 252 6255, H01F 125

Patent

active

046042229

ABSTRACT:
A stable ferrofluid composition and the method of preparing and using the ferrofluid composition, such as in a ferrofluid seal apparatus, and which ferrofluid composition comprises: a liquid carrier; ferromagnetic particles sufficient to provide magnetic properties to the ferrofluid dispersed in the liquid carrier; and a dispersing amount of a cationic surfactant to provide a stable ferrofluid composition. The stable ferrofluid compositions have improved electrical conductivity and are useful in sealing computer disc drives and in sputtering apparatus in the semiconductive industry.

REFERENCES:
patent: 3635819 (1972-01-01), Kaiser
patent: 3700595 (1972-10-01), Kaiser, II
patent: 3764540 (1973-10-01), Khalafalla
patent: 3917538 (1975-11-01), Rosenweig
patent: 3981844 (1976-09-01), Romankiw
patent: 4224396 (1980-09-01), Pollet
patent: 4430239 (1984-02-01), Wyman
patent: 4543312 (1985-09-01), Murakawa et al.
Bradshaw, et al., IBM Tech. Disc. Bull. 26 (1983) pp. 447-448.
Charles, et al., IEEE Trans. Magnet, vol. MAG-16 (1980) pp. 172-177.

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