Method to produce alumina aerogels having porosities greater than 80 percent
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.
- Research Organization:
- The Regents of the University of California, Oakland, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Number(s):
- 6,620,458
- Application Number:
- 09/970,251
- OSTI ID:
- 1174490
- Country of Publication:
- United States
- Language:
- English
Synthesis of high porosity, monolithic alumina aerogels
|
journal | June 2001 |
Preparation of heat-resistant alumina aerogels
|
journal | November 1993 |
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