Textural characterization of high temperature silica aerogels

Casu, M., Casula, M.F., Corrias, A., Paschina, G. (2003) Textural characterization of high temperature silica aerogels. Journal of Non-Crystalline Solids, 315 (1-2). pp. 97-106. ISSN 0022-3093. (doi:10.1016/S0022-3093(02)01596-X) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/S0022-3093(02)01596-X

Abstract

Silica alcogels were synthetized by the sol-gel polymerization of tetraethylorthosilicate in acid media. Conventional and supercritical drying was performed in order to obtain xerogels and aerogels. Different process parameters of the supercritical drying were altered in order to control the texture of the resulting gel. The texture and the structural evolution of xero- and aerogels were studied by thermogravimetric-differential thermal analysis, Fourier-transform infrared spectroscopy, transmission electron microscopy and N2 physisorption at 77 K. 29Si magic angle spinning nuclear magnetic resonance experiments on silica samples were used to resolve various silicon local environments. Hydrophilic microporous xerogels and hydrophobic micro- or mesoporous silica aerogels were obtained, whose microscopic structure is very similar. However, the samples obtained by different drying procedures exhibit a different structural evolution with temperature.

Item Type: Article
DOI/Identification number: 10.1016/S0022-3093(02)01596-X
Uncontrolled keywords: Microporous materials, Polymerization, Silica, Synthesis (chemical), Textures, Thermogravimetric analysis, Silica aerogels, Aerogels
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 17 Dec 2014 12:35 UTC
Last Modified: 29 May 2019 13:57 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46223 (The current URI for this page, for reference purposes)
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