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Optimization of Alumina and Aluminosilicate Aerogel Structure for High‐Temperature Performance
Author(s) -
Hurwitz Frances I.,
Gallagher Meghan,
Olin Tracy C.,
Shave Molly K.,
Ittes Marlyssa Α.,
Olafson Katy N.,
Fields Meredith G.,
Guo Haiquan,
Rogers Richard B.
Publication year - 2014
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12070
Subject(s) - boehmite , aluminosilicate , aerogel , materials science , mesoporous material , crystallization , chemical engineering , oxide , composite material , catalysis , organic chemistry , aluminium , metallurgy , chemistry , engineering
Alumina and aluminosilicate aerogels offer potential for use at temperatures above 700°C, where silica aerogels begin to sinter. Stability of alumina and aluminosilicate pore structures at high temperatures is governed by the starting aerogel structure, which, in turn is controlled by the synthesis route. Structure, morphology, and crystallization behavior are compared for aerogels synthesized from AlCl 3 and propylene oxide with those synthesized from a variety of boehmite precursors. The aerogels possessing a crystalline boehmite structure in the as‐synthesized condition retained mesoporous structures to temperatures of 1200°C, while the AlCl 3 ‐derived aerogels, although exhibiting higher as‐synthesized surface areas, crystallized and densified at 980–1005°C.