skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

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. 7 figures.

Inventors:
; ; ;
Issue Date:
OSTI Identifier:
5158336
Patent Number(s):
5275796 A
Application Number:
PPN: US 7-754349
Assignee:
Univ. of California, Oakland, CA () PTO; EDB-94-064383
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Patent File Date: 5 Sep 1991
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FOAMS; FABRICATION; SILICON OXIDES; MECHANICAL PROPERTIES; OPTICAL PROPERTIES; SOL-GEL PROCESS; THERMAL INSULATION; CHALCOGENIDES; COLLOIDS; DISPERSIONS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SILICON COMPOUNDS; 360601* - Other Materials- Preparation & Manufacture

Citation Formats

Tillotson, T.M., Poco, J.F., Hrubesh, L.W., and Thomas, I.M. Method for producing metal oxide aerogels having densities less than 0. 02 g/cc. United States: N. p., 1994. Web.
Tillotson, T.M., Poco, J.F., Hrubesh, L.W., & Thomas, I.M. Method for producing metal oxide aerogels having densities less than 0. 02 g/cc. United States.
Tillotson, T.M., Poco, J.F., Hrubesh, L.W., and Thomas, I.M. Tue . "Method for producing metal oxide aerogels having densities less than 0. 02 g/cc". United States.
@article{osti_5158336,
title = {Method for producing metal oxide aerogels having densities less than 0. 02 g/cc},
author = {Tillotson, T.M. and Poco, J.F. and Hrubesh, L.W. and Thomas, I.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. 7 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}