SANS study of the aging of xTiO2-SiO2 gels |
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| Authors: | I M Miranda Salvado F M A Margaça J Teixeira |
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| Institution: | (1) Dep. Eng. Cerâmica e Vidro, Universidade de Aveiro, 3800 Aveiro, Portugal;(2) Dep. Física, ICEN/INETI, E. N. 10, 2686 Saccvém Codex, Portugal;(3) Lab. Léon Brillouin (CNRS-CEA), C.E. Saclay, 91191 Gif-Sur-Yvette Cedex, France |
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| Abstract: | Silica-titania gels, prepared in acidic conditions, with contents of TiO2 up to 6 mol%, have been studied by small angle neutron scattering (SANS) as wet gel with increasing aging times. In all samples, small primary particles have been found with a diameter of about 3 nm. At the gel point, cylindrical clusters, ca. 10 nm long, were observed as well. These grow with aging time, becoming branched. The cluster-cluster diffusion limited aggregation model is found to be consistent with the SANS results. The growth process is independent of the TiO2 content. It is mainly influenced by the ratio of the aging time to the gelation time. |
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| Keywords: | aging SANS gels silica-titania |
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