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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.:
The Regents of the University of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174490
Patent Number(s):
6,620,458
Application Number:
09/970,251
Assignee:
The Regents of the University of California (Oakland, CA) OSTI
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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