Organic-inorganic hybrid aerogels have been prepared by an acid/base two-step sol-gel reaction utilizing urea and surfactant. Polycondensation of methyltrimethoxysilane (MTMS) is promoted by the hydrolysis of urea, and the hydrophobicity of condensates is weakened by adequate cationic or nonionic surfactant. Aerogels with low bulk density (∼ 0.13 g cm-3) and high visible light transmittance (∼ 89 % at 550 nm through 10 mm-thick sample) are obtained. The resultant hybrid aerogels show high deformability and subsequent spring-back upon uniaxial compression owing to the lower cross-linking density and residual silanol density compared to silica, and to the presence of hydrophobic methyl groups in the network. Additional aging of as-prepared wet gels in water improved mechanical properties in the case of cationic surfactant system.
|ジャーナル||IOP Conference Series: Materials Science and Engineering|
|出版ステータス||Published - 2011 1月 1|
|イベント||3rd International Congress on Ceramics, ICC 2011 - Osaka, Japan|
継続期間: 2010 11月 14 → 2010 11月 18
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