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Magnetic particles with a closed ultrathin silica layer, method for the production thereof and their use

  • US 9,617,534 B2
  • Filed: 02/19/2015
  • Issued: 04/11/2017
  • Est. Priority Date: 06/23/2005
  • Status: Active Grant
First Claim
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1. A method for production of silica-coated magnetic particles, comprising:

  • providing magnetic particles;

    depositing initial silicate from sodium silicate or silica sol on the magnetic particles to form an initially-coated magnetic particle;

    continuously diluting the initially-coated magnetic particles using cross flow microfiltration at constant volumes to reduce a pH value to a neutral pH value.

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