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

Abstract

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.

Inventors:
 [1];  [2];  [3];  [2]
  1. Tracy, CA
  2. Livermore, CA
  3. Pleasanton, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
869111
Patent Number(s):
5275796
Assignee:
Regents of University of California (Oakland, CA)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Tillotson, Thomas M, Poco, John F, Hrubesh, Lawrence W, and Thomas, Ian M. Method for producing metal oxide aerogels having densities less than 0.02 g/cc. United States: N. p., 1994. Web.
Tillotson, Thomas M, Poco, John F, Hrubesh, Lawrence W, & Thomas, Ian M. Method for producing metal oxide aerogels having densities less than 0.02 g/cc. United States.
Tillotson, Thomas M, Poco, John F, Hrubesh, Lawrence W, and Thomas, Ian M. Sat . "Method for producing metal oxide aerogels having densities less than 0.02 g/cc". United States. https://www.osti.gov/servlets/purl/869111.
@article{osti_869111,
title = {Method for producing metal oxide aerogels having densities less than 0.02 g/cc},
author = {Tillotson, Thomas M and Poco, John F and Hrubesh, Lawrence W and Thomas, Ian M},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

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