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Title: Method to produce alumina aerogels having porosities greater than 80 percent

Abstract

A two-step method for producing monolithic alumina aerogels having porosities of greater than 80 percent. Very strong, very low density alumina aerogel monoliths are prepared using the two-step sol-gel process. The method of preparing pure alumina aerogel modifies the prior known sol method by combining the use of substoichiometric water for hydrolysis, the use of acetic acid to control hydrolysis/condensation, and high temperature supercritical drying, all of which contribute to the formation of a polycrystalline aerogel microstructure. This structure provides exceptional mechanical properties of the alumina aerogel, as well as enhanced thermal resistance and high temperature stability.

Inventors:
;
Issue Date:
Research Org.:
Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174490
Patent Number(s):
6620458
Application Number:
09/970,251
Assignee:
The Regents of the University of California (Oakland, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Poco, John F., and Hrubesh, Lawrence W. Method to produce alumina aerogels having porosities greater than 80 percent. United States: N. p., 2003. Web.
Poco, John F., & Hrubesh, Lawrence W. Method to produce alumina aerogels having porosities greater than 80 percent. United States.
Poco, John F., and Hrubesh, Lawrence W. Tue . "Method to produce alumina aerogels having porosities greater than 80 percent". United States. https://www.osti.gov/servlets/purl/1174490.
@article{osti_1174490,
title = {Method to produce alumina aerogels having porosities greater than 80 percent},
author = {Poco, John F. and Hrubesh, Lawrence W.},
abstractNote = {A two-step method for producing monolithic alumina aerogels having porosities of greater than 80 percent. Very strong, very low density alumina aerogel monoliths are prepared using the two-step sol-gel process. The method of preparing pure alumina aerogel modifies the prior known sol method by combining the use of substoichiometric water for hydrolysis, the use of acetic acid to control hydrolysis/condensation, and high temperature supercritical drying, all of which contribute to the formation of a polycrystalline aerogel microstructure. This structure provides exceptional mechanical properties of the alumina aerogel, as well as enhanced thermal resistance and high temperature stability.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {9}
}

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Works referenced in this record:

Preparation of heat-resistant alumina aerogels
journal, November 1993


Synthesis of high porosity, monolithic alumina aerogels
journal, June 2001