Preparation effects on zirconia aerogel morphology

Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) of zirconia aerogels' morphology show a strong effect of the mode of supercritical drying on zirconia structure and a remarkable similarity of aerogels obtained using either acetic or nitric acid as process moderator...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1998-04, Vol.225 (1-3), p.115-119
Main Authors: Mrowiec-Białoń, J, Pająk, L, Jarzębski, A.B, Lachowski, A.I, Malinowski, J.J
Format: Article
Language:English
Subjects:
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
Gelation
General and physical chemistry
Small-angle X-ray scattering
Supercritical drying
Zirconia aerogel
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Summary:Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) of zirconia aerogels' morphology show a strong effect of the mode of supercritical drying on zirconia structure and a remarkable similarity of aerogels obtained using either acetic or nitric acid as process moderators. A fine polymeric structure in sub-nanometer scales and 20-nm polymeric aggregates were observed in aerogels obtained from the supercritical CO 2 route. More massive polymeric structure in nanometer scales resulted from the standard high temperature process. Upon calcination at 773 K, all samples proved to be quite similar in morphology but a bit different in crystal structure.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(98)00016-7