Controlled Solubilization of Toluene by Silicate−Catanionic Surfactant Mesophases as Studied by in Situ and ex Situ XRD
Controlled Solubilization of Toluene by Silicate−Catanionic Surfactant Mesophases as Studied by in Situ and ex Situ XRD
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DOI：
10.1021/la011240a
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发表时间：
2002-01
期刊：
影响因子：
3.9
通讯作者：
A. Lind;J. Andersson;S. Karlsson;P. Ågren;P. Bussian;H. Amenitsch;M. Lindén
中科院分区：
文献类型：
--
作者：
A. Lind;J. Andersson;S. Karlsson;P. Ågren;P. Bussian;H. Amenitsch;M. Lindén
在溶胀剂存在下合成的M41 S型介观有序硅酸盐-表面活性剂复合材料已通过原位和非原位X射线衍射分析表征。室温合成的关键特征是使用阳离子和阴离子表面活性剂的混合物作为结构导向剂。混合表面活性剂聚集体的较低界面电荷密度稳定了较低界面曲率的结构，因此有利于有机溶胀剂的更受控的溶解。观察到阴阳离子表面活性剂-硅酸盐中间相的增溶能力增加，接近对应于在不存在甲苯的情况下过渡到层状相的阴离子/阳离子表面活性剂比率。在甲苯的存在下，阴阳离子模板稳定微乳液液滴，作为最终材料的构建块。然而，相当数量的有机化合物溶解在二氧化硅-阴阳离子表面活性剂复合物中。
Mesoscopically ordered silicate−surfactant composite materials of the M41S type synthesized in the presence of a swollen agent have been characterized by in situ and ex situ X-ray diffraction analysis. The key feature of the room-temperature synthesis is the use of a mixture of cationic and anionic surfactants as structure-directing agents. The lower interfacial charge density of the mixed surfactant aggregates stabilizes structures of lower interfacial curvature and therefore facilitates a more controlled solubilization of organic swelling agents. An increased solubilization capacity of the catanionic surfactant−silicate mesophase was observed close to an anionic/cationic surfactant ratio corresponding to a transition to the lamellar phase in the absence of toluene. In the presence of toluene, the catanionic template stabilizes microemulsion droplets that serve as building blocks for the final material. However, a fair amount of organic compound is solubilized in the silica−catanionic surfactant composit...