Magnetically attractable particles and method

Details Magnetically attractable particles and method Magnetically attractable particles and method

1994-11-29

1997-09-02

Lovering, Richard D.

Compositions

Magnetic

Iron-oxygen compound containing

252 6252, 4272133, 42840224, 435176, 501 12, C01G 4908, B01J 1302, C04B 3526, C04B 35624

Patent

active

056628242

ABSTRACT:
Magnetically attractable particles comprise a core of magnetic material encapsulated in a metal oxide coating. They may be made by emulsifying an aqueous solution or dispersion of the magnetic material or precursor, and an aqueous solution or sol of a coating inorganic oxide or precursor, in an inert water-immiscible liquid. The aqueous droplets are gelled, e.g. by ammonia or an amine, recovered, and heated at 250.degree.-2000.degree. C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.

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patent: 4882224 (1989-11-01), Moro et al.
patent: 5039559 (1991-08-01), Sang et al.

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