Ferrofluid composition and method of making and using same

Compositions – Magnetic – Chromium or chromium compound containing

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252 6252, 252 6253, H01F 1010

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active

044302398

ABSTRACT:
A stable liquid composition which comprises a colloidal dispersion of finely-divided, magnetic particles in a liquid polar carrier and a dispersing amount of a surfactant, which surfactant comprises a phosphoric acid ester of a long-chain alcohol, the alcohol compatible with the polar carrier, to provide a stable ferrofluid composition.

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patent: 3917538 (1975-11-01), Rosensweig
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patent: 4285801 (1981-08-01), Chiang
patent: 4315827 (1982-02-01), Bottenberg et al.
patent: 4333988 (1982-06-01), Yamada et al.

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