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Ferrofluid composition and process

  • US 6,277,298 B1
  • Filed: 10/28/1999
  • Issued: 08/21/2001
  • Est. Priority Date: 10/28/1999
  • Status: Expired due to Term
First Claim
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1. An improved ferrofluid composition comprising:

  • a plurality of magnetic particles;

    a silane-based surface modifier adsorbed on said plurality of magnetic particles as a surfactant-accepting layer, said surface modifier having a small enough molecular weight sufficient to be a nondispersant and having little or no individuality compared to the individuality of a surfactant;

    at least one surfactant coating over said silane-based surface modifier in the outer layers of said plurality of magnetic particles; and

    a carrier liquid.

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