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Title: Method for producing metal oxide aerogels having densities less than 0.02 g/cc

A two-step method is described for making transparent aerogels which have a density of less than 0.003 g/cm.sup.3 to those with a density of more than 0.8 g/cm.sup.3, by a sol/gel process and supercritical extraction. Condensed metal oxide intermediate made with purified reagents can be diluted to produce stable aerogels with a density of less than 0.02 g/cm.sup.3. High temperature, direct supercritical extraction of the liquid phase of the gel produces hydrophobic aerogels which are stable at atmospheric moisture conditions. Monolithic, homogeneous silica aerogels with a density of less than 0.02 to higher than 0.8 g/cm.sup.3, with high thermal insulation capacity, improved mechanical strength and good optical transparency, are described.
 [1];  [2];  [3];  [2]
  1. (Tracy, CA)
  2. (Livermore, CA)
  3. (Pleasanton, CA)
Issue Date:
OSTI Identifier:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5275796
Contract Number:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
method; producing; metal; oxide; aerogels; densities; 02; cc; two-step; described; transparent; density; 003; cm; sol; process; supercritical; extraction; condensed; intermediate; purified; reagents; diluted; produce; stable; temperature; direct; liquid; phase; produces; hydrophobic; atmospheric; moisture; conditions; monolithic; homogeneous; silica; thermal; insulation; capacity; improved; mechanical; strength; optical; transparency; oxide aerogels; producing metal; improved mechanical; supercritical extraction; thermal insulation; metal oxide; liquid phase; mechanical strength; optical transparency; transparent aerogel; hydrophobic aerogels; condensed metal; silica aerogels; silica aerogel; step method; /423/502/516/