摘要 |
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 - 2000<o>C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size. |
申请人 |
ANAGEN (U.K.) LTD., ALDERSHOT, HAMPSHIRE, US |
发明人 |
SANG, JEAN VICTOR, KINGSTON ONTARIO, K7N 1A2, CA;GROVES, PAUL, CHARLBURY OXON, GB;BURRELL, ROBERT EDWARD, KINGSTON ONTARIO, K7M 3Z1, CA;FLYNN, GERARD, BLOXHAM OXON, GB |