Methods for the manufacture of magnetically responsive particles

Details Methods for the manufacture of magnetically responsive particles Methods for the manufacture of magnetically responsive particles

1995-06-07

1997-12-16

Marschel, Ardin H.

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427127, 427414, 427560, 427598, 427601, 428402, 435 4, 435 72, 435 74, 435 77, 435 78, 436501, 436526, 436528, 436533, 530363, 252 6256, H01F 100, B05D 136, B01J 1908, B29C 3508

Patent

active

056982712

ABSTRACT:
The invention relates to an improved method for the manufacture of magnetically responsive particles, also called ferrofluids. The improved method involves a heat treatment step, which may occur at various times during the preparation of the materials, including during subdivision of the magnetic starting material, during the addion of a coating material, after formation of a magnetically responsive particle, or some combination thereof. The materials formed by such a process have numerous advantages over materials formed by other processes, including enhanced salt stability, increased coating uptake, and increased binding capacity. These ferrofluids have applications in a variety of preparative and diagnostic techniques, including immunoassay, cell separations, toxicity testing, food testing, environmental analysis, and MRI.

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