Magnetic fluids and process for obtaining them

Details Magnetic fluids and process for obtaining them Magnetic fluids and process for obtaining them

1980-07-10

1982-05-11

Edmundson, F.

Compositions

Magnetic

Flaw detection or magnetic clutch

G01N 2782, H01F 100

Patent

active

043292410

ABSTRACT:
New ferrofluids.
They consist essentially of an aqueous sol of polyoxyanions of Fe(III) and at least one metal of oxidation degree II from the first series of transition metals, with an associated cation, notably selected from H.sup.+,N (CH.sub.3).sub.4.sup.+ and N(C.sub.2 H.sub.5).sub.4.sup.+.
Application for example for obtaining levitation or self-sustentation systems, as well as for forming contactors or rotating paths.

REFERENCES:
patent: 3990981 (1976-11-01), Kovac et al.
patent: 4019994 (1977-04-01), Kelley
patent: 4094804 (1978-06-01), Shimoiizaka
Ronay, IBM Tech. Disclosure Bull. vol. 19, No. 7, pp. 2753-2758 (12/76).

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