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Structural study of fractal silica humid gels |
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| Authors: | A. Craievich D. I. dos Santos and M. Aegerter T. Lours and J. Zarzycki |
| Affiliation: | Laboratório Nacional de Luz Sincrotron, CNPq, Campinas, and Instituto de Fisica, Universidade de São Paulo, São Paulo, Brasil Instituto de Fisica e Quimica de São Carlos, Universidade de São Paulo, São Carlos, SP, Brasil Laboratoire de Science des Matériaux Vitreux, Université du Languedoc, Montpellier, France |
| Abstract: | The structures of gels of silica obtained from solutions of TMOS, methanol and water have been studied by small angle X-ray scattering (SAXS) using synchrotron radiation. The SAXS results indicate that all the gels studied exhibit fractal structures. It is inferred that gels obtained under basic conditions are volume fractals built up by surface and volume fractal units for high and low water content, respectively. The gels obtained under acidic conditions are all volume fractals having structural units much smaller than those of basic gels. The influence of aging on the structure of basic gels has also been established. |
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