Skip to Main content Skip to Navigation
Journal articles

Investigation of the multi-scale structure of silica aerogels by SAXS

Abstract : An investigation is described into polyethoxydisiloxane (PEDS-Px) silica precursors of aerogels prepared in ethylacetoacetate (etac) under HF conditions and dried under CO2 supercritical conditions. The influence upon the internal nanostructure of aerogels of the number of water molecules (n*) used to synthesize the precursors is studied, as well as that of their volume fraction (xPrec) in solution during the second catalytic step. Correlation between structure and optical transmission (%TR) is necessary to improve optical behavior of monolithic silica aerogels for double-window applications. For this reason, small angle X-ray scattering (SAXS) was performed to characterize the nanostructural silica skeleton, and especially to investigate particle and cluster properties. Optical transmission was also measured to estimate visible optical quality of the samples (%TR). Among other results, it is shown in this study that increasing n* and xPrec contributes to the decrease of the particle and cluster sizes, which indirectly improves %TR in the visible range. These observations confirm and help to explain previously published results.
Document type :
Journal articles
Complete list of metadata

https://hal-mines-paristech.archives-ouvertes.fr/hal-00536989
Contributor : Corinne Matarasso <>
Submitted on : Wednesday, November 17, 2010 - 2:18:30 PM
Last modification on : Friday, September 10, 2021 - 1:52:10 PM

Links full text

Identifiers

Citation

Arnaud Rigacci, Françoise Ehrburger-Dolle, Erik Geissler, Bruno Chevalier, Hébert Bruce Sallée, et al.. Investigation of the multi-scale structure of silica aerogels by SAXS. Journal of Non-Crystalline Solids, Elsevier, 2001, 285 (1-3), p. 187-193. ⟨10.1016/S0022-3093(01)00452-5⟩. ⟨hal-00536989⟩

Share

Metrics

Record views

761