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Tailoring of Boehmite-Derived Aluminosilicate Aerogel Structure and Properties: Influence of Ti AdditionAluminosilicate aerogels offer potential for extremely low thermal conductivities at temperatures greater than 900 C, beyond where silica aerogels reach their upper temperature limits. Aerogels have been synthesized at various Al:Si ratios, including mullite compositions, using Boehmite (AlOOH) as the Al source, and tetraethoxy orthosilicate as the Si precursor. The Boehmite-derived aerogels are found to form by a self-assembly process of AlOOH crystallites, with Si-O groups on the surface of an alumina skeleton. Morphology, surface area and pore size varies with the crystallite size of the starting Boehmite powder, as well as with synthesis parameters. Ternary systems, including Al-Si-Ti aerogels incorporating a soluble Ti precursor, are possible with careful control of pH. The addition of Ti influences sol viscosity, gelation time pore structure and pore size distribution, as well as phase formation on heat treatment.
Document ID
20110012055
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Hurwitz, Frances I. (NASA Glenn Research Center Cleveland, OH, United States)
Guo, Haiquan (Ohio Aerospace Inst. Cleveland, OH, United States)
Sheets, Erik J. (Purdue Univ. West Lafayette, IN, United States)
Miller, Derek R. (Michigan State Univ. East Lansing, MI, United States)
Newlin, Katy N. (Louisville Univ. Louisville, KY, United States)
Date Acquired
August 25, 2013
Publication Date
November 29, 2010
Subject Category
Chemistry And Materials (General)
Report/Patent Number
E-17642
Meeting Information
Meeting: Materials Research Society Fall Meeting 2010
Location: Boston, MA
Country: United States
Start Date: November 29, 2010
End Date: December 2, 2010
Funding Number(s)
WBS: WBS 599489.02.07.03.02.02.02
Distribution Limits
Public
Copyright
Public Use Permitted.

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