Dilution stable water based magnetic fluids

Details Dilution stable water based magnetic fluids Dilution stable water based magnetic fluids

1979-02-12

1980-06-17

Edmundson, F.

Compositions

Magnetic

Flaw detection or magnetic clutch

C09D 1100, F16D 3702, H01F 128

Patent

active

042082943

ABSTRACT:
A dilution stable water based magnetic fluid is provided by dispersing magnetic particles in water with the aid of a C.sub.10 -C.sub.15 aliphatic monocarboxylic acid. The magnetic particles are preferably particles of magnetite, prepared by precipitation of dissolved iron chloride salts from aqueous solution by the use of ammonium hydroxide. The preferred acids used in preparing the dispersions are dodecanoic (C.sub.12) and tridecanoic (C.sub.13).

REFERENCES:
patent: 3764540 (1973-10-01), Khalafalla et al.
patent: 3843540 (1974-10-01), Reimers et al.

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