Magnetically attractable particles and method

Details Magnetically attractable particles and method Magnetically attractable particles and method

H - Electricity

01

F

31/121, 117/48.5

H01F 1/36 (2006.01)

Patent

CA 1340158

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°C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.

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