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Abstract

Particles of a nonmagnetic material are rendered magnetic by contacting their surfaces with a magnetizing reagent comprising water containing particles of a magnetic material, each of which has a two layer surfactant coating including an inner layer and an outer layer. The inner layer covers the magnetic particle and is a mono- molecular layer of a first water soluble, organic, hetero- polar surfactant containing at least 3 carbon atoms and having a functional group on one end which bonds with the magnetic particle. The outer layer coats the inner layer and is a monomolecular layer of a second water soluble, organic heteropolar surfactant containing at least three carbon atoms and having a hydrophobic end bonded to the hydrophobic end of the first surfactant and a functional group on the other end capable of bonding with the particles to be magnetized.

Patent Number

4,906,382

Assignee

Board of Control of Michigan Technological University, Houghton, Mich.

Application Number

261,788

Date Filed

10-24-1988

Certificate of Correction

No

Issue Date

3-6-1990

Disciplines

Engineering | Mechanical Engineering

Method of magnetizing nonmagnetic materials

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