Issue 47, 2009
From the journal:

Journal of Materials Chemistry

Elastic low density aerogels derived from bis[3-(triethoxysilyl)propyl]disulfide, tetramethylorthosilicate and vinyltrimethoxysilanevia a two-step process

Haiquan Guo,*a   Baochau N. Nguyen,a   Linda S. McCorkle,a   Brian Shonkwilerb  and  Mary Ann B. Meador*c  

* Corresponding authors

a Ohio Aerospace Institute, Cedar Point Road, Cleveland, OH, USA
E-mail: HaiquanGuo@oai.org
Fax: +1 216.977.7132
Tel: +1 216.433.6094

b Clark Atlanta University, 223 James P Brawley Drive, Atlanta, GA

c NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH
E-mail: maryann.meador@nasa.gov
Fax: +1 216.977.7132
Tel: +1 216.433.3221

Abstract

A series of low density, porous structures were prepared using bis[3-(triethoxysilyl)propyl]disulfide (BTSPD), tetramethylorthosilicate (TMOS) and vinyltrimethoxysilane (VTMS) as precursors via a two-step (acid–base) sol-gel process followed by supercritical CO2 extraction. Using statistical experimental design methodology and empirical modelling, the concentrations of BTSPD, TMOS and VTMS were varied in the production of the monoliths and found to have a significant effect on their bulk density, porosity, BET surface areas, hydrophobicity and mechanical properties. Increasing the TMOS concentration significantly increases the surface area and Young's modulus while higher VTMS concentration improves hydrophobicity and higher BTSPD concentration leads to increased elastic recovery after compression. Optimized aerogels produced in the study have a combination of high Young's modulus, good hydrophobicity and near complete recovery after compression in agreement with model predictions.

Graphical abstract: Elastic low density aerogels derived from bis[3-(triethoxysilyl)propyl]disulfide, tetramethylorthosilicate and vinyltrimethoxysilane via a two-step process

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Article information

DOI
https://doi.org/10.1039/B916355G
Article type
Paper
Submitted
10 Aug 2009
Accepted
22 Sep 2009
First published
21 Oct 2009

J. Mater. Chem., 2009,19, 9054-9062

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Elastic low density aerogels derived from bis[3-(triethoxysilyl)propyl]disulfide, tetramethylorthosilicate and vinyltrimethoxysilane via a two-step process

H. Guo, B. N. Nguyen, L. S. McCorkle, B. Shonkwiler and M. A. B. Meador, J. Mater. Chem., 2009, 19, 9054 DOI: 10.1039/B916355G

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