Thermal stability of Al-modified silica aerogels through epoxide-assisted sol–gel route followed by ambient pressure drying

Thermal stability of Al-modified silica aerogels through epoxide-assisted sol–gel route... A novel method for preparing Al-modified silica aerogels with pretreated kaolin as the raw material is developed. Sols comprising silica and Al are prepared by an in situ reaction method from pretreated kaolin. The pretreatment step simplifies the process, saves preparation time, and reduces costs. A method for adjusting the Al content in the aerogel by changing the washing time of the sol during the ion impurity removal process is also presented. The volume stabilities and thermal properties of the Al-modified silica aerogels after high-temperature treatment are investigated. The results indicate that a small amount of modified Al improves the volumetric stability of an aerogel owing to viscous sintering of the Si–O–AlIV–(O–AlVI)y units, which increases the disorder of the SiO2 structure, building a barrier to viscous flow and hindering mass transfer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Sol-Gel Science and Technology Springer Journals

Thermal stability of Al-modified silica aerogels through epoxide-assisted sol–gel route followed by ambient pressure drying

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Ceramics, Glass, Composites, Natural Materials; Inorganic Chemistry; Optical and Electronic Materials; Nanotechnology
ISSN
0928-0707
eISSN
1573-4846
D.O.I.
10.1007/s10971-018-4707-x
Publisher site
See Article on Publisher Site

Abstract

A novel method for preparing Al-modified silica aerogels with pretreated kaolin as the raw material is developed. Sols comprising silica and Al are prepared by an in situ reaction method from pretreated kaolin. The pretreatment step simplifies the process, saves preparation time, and reduces costs. A method for adjusting the Al content in the aerogel by changing the washing time of the sol during the ion impurity removal process is also presented. The volume stabilities and thermal properties of the Al-modified silica aerogels after high-temperature treatment are investigated. The results indicate that a small amount of modified Al improves the volumetric stability of an aerogel owing to viscous sintering of the Si–O–AlIV–(O–AlVI)y units, which increases the disorder of the SiO2 structure, building a barrier to viscous flow and hindering mass transfer.

Journal

Journal of Sol-Gel Science and TechnologySpringer Journals

Published: Jun 4, 2018

References

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