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:
-
- Tracy, CA
- Livermore, CA
- Pleasanton, CA
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 869111
- Patent Number(s):
- US 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. 1994.
"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 = {},
url = {https://www.osti.gov/biblio/869111},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}