Inorganic-Organic Hybrid Hierarchically Structured Methyl-modified Silica Monoliths


Highly porous inorganic-organic hybrid monoliths with mesopores in a macroporous network have been prepared from methyltris(2-hydroxyethoxy)silane (MeGMS) and tetrakis(2-hydroxyethoxy)silane (EGMS) in the presence of an amphiphilic block copolymer. The amount of methyltris(2-hydroxyethoxy)silane (MeGMS) in the gel has been varied from 0 to 100 %. These glycol-modified silanes have the advantage of being water-soluble and thus allowing for a direct templating of liquid-crystalline surfactant mesophases without the presence of a homogenizing organic solvent such as ethanol. The wet gels have been dried by supercritical extraction with carbon dioxide.

In the present work, the sol-gel behaviour of these glycol-modified silanes is discussed especially with a focus on the formation of the meso- and macrostructure. In addition, the influences of the varying ratios of methyltris(2-hydroxyethoxy)silane on the structural features of the gels are investigated by various analytical techniques such as small angle X-ray scattering, nitrogen sorption, and scanning electron microscopy.

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We thank E. Eitenberger and Prof. Dr. G. Friedbacher for the SEM images.

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Correspondence to Doris Brandhuber.

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Brandhuber, D., Hüsing, N. & Peterlik, H. Inorganic-Organic Hybrid Hierarchically Structured Methyl-modified Silica Monoliths. MRS Online Proceedings Library 847, 320–327 (2004).

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