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The role of phase changes in maintaining pore structure on thermal exposure of aluminosilicate aerogels

Published online by Cambridge University Press:  14 September 2017

Frances I. Hurwitz*
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA
Richard B. Rogers
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA
Haiquan Guo
Affiliation:
Ohio Aerospace Institute, Cleveland, OH 44142, USA
Kevin Yu
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
Jennifer Domanowski
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
Eric Schmid
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
Meredith G. Fields
Affiliation:
Universities Space Research Association, NASA Glenn Research Center, Cleveland, OH 44135, USA
*
Address all correspondence to F. I. Hurwitz at frances.hurwitz@nasa.gov
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Abstract

A variety of applications from insulation to catalytic supports can benefit from lightweight, high surface area, mesoporous materials, which maintain their mesoporous structure to temperatures of 900–1200 °C. Silica aerogels begin to densify by 700 °C. Alumina aerogels are capable of higher temperature exposure than their silica counterparts, but undergo successive phase transformations to form transitional aluminas prior densifying to α-alumina. The present study characterizes the phase transitions of aluminosilicate aerogels derived from Boehmite powders to elucidate the role of time and temperature on phase transitions, surface area, and morphology. Aerogel compositions stable to 1200 °C for periods of 24 h have been demonstrated.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2017 

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