Multi-fractal imaging and structural investigation of silica hydrogels and aerogels |
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Authors: | Ekaterina Vinogradova Abel Moreno Victor Hugo Lara Pedro Bosch |
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Institution: | (1) Instituto de Química, UNAM, Ciudad Universitaria, 04510 México DF, México;(2) UAM-Iztapalapa, Apdo. Postal 55-534, México DF, México;(3) Instituto de Investigaciones en Materiales, UNAM, Ciudad Universitaria, 04510 México DF, México |
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Abstract: | In this work, we report on the preparation of TEOS gels by means of the sol–gel method employing different TEOS/ethanol/water ratios at room temperature. Small-angle X-ray scattering (SAXS) measurements provide the first-generation structural parameters, which indicate that particle size and fractal dimension are synthesis and depth dependent. These results are supported by the second- and third-generation aggregates observed using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The fiber-like first-generation clusters aggregate as spherical second-generation particles which, in turn, in the third generation rearrange into complex structures. |
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Keywords: | hierarchical structure silica aerogels silica hydrogels tetraethoxysilane (TEOS) |
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