Synthesis and characterization of inorganic gels in a lyotropic liquid crystal medium .2. Synthesis of silica gels in lyotropic crystal phases obtained from cationic surfactants
Synthesis and characterization of inorganic gels in a lyotropic liquid crystal medium .2. Synthesis of silica gels in lyotropic crystal phases obtained from cationic surfactants
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DOI：
10.1039/jm9960601789
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发表时间：
1996-11-01
影响因子：
--
通讯作者：
Lacan, P
中科院分区：
文献类型：
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作者：
Dabadie, T;Ayral, A;Lacan, P
以溶致液晶相为模板，采用溶胶-凝胶法合成了具有可剪裁孔隙率的微孔二氧化硅材料。起始各向同性溶胶由四甲氧基硅烷、水和烷基三甲基溴化铵混合而成。二氧化硅网络的聚合和两亲性中间相的形成是同步的、协同的。在表面活性剂分子热消除后，二氧化硅材料中保持有序的多孔织构。孔的大小与模板单元的大小有关，并受所用表面活性剂的烷基链长度的调节。本文对合成的各个步骤进行了研究，并从模板效应的角度对最终材料的多孔织构进行了表征和讨论。
Microporous silica materials with tailored porosity are synthesized by the sol-gel process using lyotropic liquid-crystal phases as templates. The starting isotropic sol is obtained by mixing tetramethoxysilane, water and an alkyltrimethylammonium bromide. The polymerization of the silica network and the formation of the amphiphilic mesophase are simultaneous and cooperative. After thermal elimination of the surfactant molecules, an ordered porous texture is maintained in the silica material. The pore size is related to the size of the templating unit and modulated by the length of the alkyl chain of the used surfactant. In this paper, the various steps of the synthesis are studied and the porous texture of the final material is characterized and discussed in terms of templating effects.