Encapsulated superparamagnetic particles

Details Encapsulated superparamagnetic particles Encapsulated superparamagnetic particles

1988-05-10

1990-10-23

Straub, Gary P.

Compositions

Magnetic

With wax, bitumen, resin, or gum

42721333, 428403, 428407, H01F 126, B01J 1310

Patent

active

049650076

ABSTRACT:
Stable, encapsulated superparamagnetic magnetite particles having a narrow particle size distribution with average particle diameters in the range of from about 50 .ANG. to about 350 .ANG. are prepared by forming an aqueous dispersion of magnetite particles having the above particle size characteristics in the presence of a surfactant, coacervating a mixture of gelatin and a carboxyl containing hydrophilic polymer such as gum arabic to form a thin coating of coacervate on the magnetite particles and crosslinking the coacervate coating with a gelatin hardener such as glutaraldehyde.

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