Superparamagnetic fluids and methods of making superparamagnetic

Details Superparamagnetic fluids and methods of making superparamagnetic Superparamagnetic fluids and methods of making superparamagnetic

1990-06-08

1991-11-12

Lewis, Michael

Compositions

Magnetic

Flaw detection or magnetic clutch

252 6251, H01F 128

Patent

active

050645501

ABSTRACT:
A superparamagnetic fluid having a non-polar hydrocarbon oil carrier liquid and coated magnetic particles coated with at least one acid selected from the group consisting of an organic acid containing only carbon and hydrogen atoms in the chain connected to the carboxyl group, wherein the chain contains at least 19 carbon atoms, and an amino acid acylated with a fatty acid, provided that said organic and amino acids are branched, unsaturated, or both.
A method of making a superparamagnetic fluid, including providing an aqueous suspension of coated magnetic particles coated with at least one acid selected from the group consisting of an organic acid containing only carbon and hydrogen atoms in the chain connected to the carboxyl group, wherein the chain contains at least 19 carbon atoms, and an amino acid acylated with a fatty acid, provided that said orgaic and amino acids are branched, unsaturated, or both. The coated magnetic particles are then separated from water in the aqueous suspension and then dispersed in a non-polar hydrocarbon oil carrier liquid to form a superparamagnetic fluid.

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patent: 3758525 (1973-09-01), Yoshida et al.
patent: 4153754 (1979-05-01), Huisman
patent: 4400295 (1983-08-01), Ootsu et al.
patent: 4701276 (1987-10-01), Wyman
patent: 4892798 (1990-01-01), Lamanna et al.
patent: 4956113 (1990-09-01), Kanno et al.
Technical Bulletin for Lubrizol 6418.TM.-Dec. 1988.

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