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A Novel Route for Preparation of Transparent and Superhydrophobic Silica Aerogels

Published online by Cambridge University Press:  31 January 2011

Guo-you Wu ,
Xuan Cheng ,
Yu-xi Yu  and
Ying Zhang
Guo-you Wu
Affiliation:
[email protected], xiamen university, Materials Science & Engineering, College of Materials, xiamen, China
Xuan Cheng
Affiliation:
[email protected], xiamen university, Materials Science & Engineering, College of Materials, xiamen, China
Yu-xi Yu
Affiliation:
[email protected], xiamen university, Materials Science & Engineering, College of Materials, xiamen, China
Ying Zhang
Affiliation:
[email protected], xiamen university, Materials Science & Engineering, College of Materials, xiamen, China
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Abstract

Silica aerogels were synthesized via sol-gel processing followed by a two-step surface modification and ambient pressure drying, using methyltrimethoxysilane (MTMS) and trimethylchlorosilane (TMCS)/ethanol/n-hexane as surface modification agents. The transparent silica aerogels possessed the porosities, densities and specific surface areas in the range of 87.7–92.3%, 0.27–0.17 g·cm-3 and 852–1005 m2·g-1, respectively. The SEM and HRTEM analysis revealed the three-dimensional nanoporous structure of the silica aerogels. The presence of –CH3 functional groups on the surface of silica particles as indicated by the FTIR spectra was further confirmed by two visible exothermic peaks at 310 and 450–500 °C from the DTA curve. In addition, the silica aerogels were superhydrophobic with the contact angle as high as 160°.

Keywords

aerogelsol-gelmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1234: Symposium QQ – Responsive Gels and Biopolymer Assemblies , 2009 , 1234-QQ06-12
Copyright
Copyright © Materials Research Society 2010

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