Ferrofluid compositions

Details Ferrofluid compositions Ferrofluid compositions

1990-04-30

1992-02-04

Lewis, Michael

Compositions

Magnetic

Flaw detection or magnetic clutch

252 6251, H01F 128

Patent

active

050857894

ABSTRACT:
A ferrofluid composition is defined by fine particles of ferromagnetic material, a liquid carrier for dispersing the ferromagnetic material and a surfactant or surfactants acting as a dispersant. The surfactant is required to have such relation to the carrier that the surfactant has, as its hydrophobic group portion, a structure equivalent to the carrier, and the carrier is selected to be either an alkylpolyphenyl ether oil, an alkylnaphthalene oil or both. By virtue of this structural feature, fine ferromagnetic particles are uniformly and stably dispersed throughout the carrier which has low viscosity and is thermally very stable.

REFERENCES:
patent: 4013569 (1977-03-01), Chiu et al.
patent: 4315827 (1982-02-01), Bottenberg et al.
patent: 4599184 (1986-07-01), Nakatani et al.
patent: 4701276 (1987-10-01), Wyman
patent: 4753754 (1988-06-01), Messenger et al.

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