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Production of hollow aerogel microspheres

  • US 5,227,239 A
  • Filed: 11/30/1990
  • Issued: 07/13/1993
  • Est. Priority Date: 11/30/1990
  • Status: Expired due to Fees
First Claim
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1. A process for preparing hollow aerogel microspheres, comprising the steps of:

  • reacting metal alkoxide with water and base catalyst in alcohol solvent until a viscous alcogel is attained;

    forming a drop of viscous alcogel;

    injecting inert gas and base catalyst into the drop, at the time of drop formation, to form a hollow alcogel microsphere;

    blowing the hollow alcogel microsphere free of the viscous alcogel to fall into an atmosphere of inert gas and base catalyst;

    capturing said hollow alcogel microsphere on foam; and

    subjecting said hollow alcogel microsphere to supercritical drying to form a hollow aerogel microsphere of 800-1200 μ

    m diameter with a wall thickness of 100-300 μ

    m and a wall density of 0.03 to 0.3 g/cm3.

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