Investigation of the multi-scale structure of silica aerogels by SAXS - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2001

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

(1) , (2, 3) , (2) , (4) , (4) , (1) , (3) , (5) , (6) , (6) , (7) , (7) , (2)
1
2
3
4
5
6
7

Résumé

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.

Dates et versions

hal-00536989 , version 1 (17-11-2010)

Identifiants

Citer

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, 2001, 285 (1-3), p. 187-193. ⟨10.1016/S0022-3093(01)00452-5⟩. ⟨hal-00536989⟩
334 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More