Please use this identifier to cite or link to this item: doi:10.22028/D291-24038
Title: SAXS and BET studies of aging and densification of silica aerogels
Author(s): Lours, Thierry
Zarzycki, Jerzy
Craievich, Aldo F.
Dos Santos, Dayse Iara
Aegerter, Michel A.
Language: English
Year of Publication: 1987
OPUS Source: Journal of non-crystalline solids. - 95/96. 1987, 2, S. 1151-1157
SWD key words: Beugung
Biologischer Expositionstest
Dichte <Physik>
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Aerogels prepared by hypercritical drying of gels obtained by hydrolysis of TMOS/methanol 50% solution in acid and basic conditions were studied combining SAXS and BET methods. Diffraction results do not seem to reveal a fractal character as the POROD's limit I(q) q4 &#8594; Cte was obtained in all cases without well characterised portions in log I(q) vs log q graphs. Aging produces a small increase in the density of the matrix. Densification studies indicate that for moderate temperatures 530°-810°C the poresshow a shrinkage due to a diffusion controlled mechanism with an activation energy &#916;E ~ 9 Kcal/mole. For higher temperatures expansion due to bloating was observed. The density of the matrix undergoes only a slight increase.
Link to this record: urn:nbn:de:bsz:291-scidok-21618
Date of registration: 17-Jun-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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