Fibrous Silica Composites Fabricated Via Sol–Gel Processing Using Amino Acid Surfactant Templating

Author： Mitra Atanu   Imae Toyoko   Shchipunov Yurii  

Publisher： Springer Publishing Company

ISSN： 0928-0707

Source： Journal of Sol-Gel Science and Technology, Vol.34, Iss.2, 2005-05, pp. : 127-130

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Abstract

Fibrils covered by a silica shell have been fabricated by using fibrous aggregates of amino acid surfactant, N-dodecanoyl-β-alanine, as a template for silicate generated in situ by sol–gel processing in an aqueous solution at pH around 6 and ambient temperature. It was shown that these conditions were inappropriate for tetraethoxysilane to generate silica. The synthesis was performed only when a new water-soluble precursor, tetrakis (2-hydroxy ethyl) orthosilicate, was applied. It is suggested that silica nucleation on the surfactant fibrils takes place via the formation of hydrogen bonds with corresponding functional groups of the amino acid residues.

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