Synthesis of Nanosized Multilayered Silica Vesicles with High Hydrothermal Stability

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• 作者：Xin Gu ; Changlin Li ; Xiaohui Liu ; Jiawen Ren ; Yanqin Wang ; Yanglong Guo ; Yun Guo ; Guanzhong Lu
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：April 23, 2009
• 年：2009
• 卷：113
• 期：16
• 页码：6472-6479
• 全文大小：648K
• 年卷期：v.113,no.16(April 23, 2009)
• ISSN：1932-7455

文摘

Nanosized multilayered silica vesicles have been synthesized through a dual-template way by using cetyltrimethylammonium bromide (CTAB) and C₃F₇O(CFCF₃CF₂O)₂CFCF₃ CONH(CH₂)₃N⁺(C₂H₅)₂CH₃I⁻ (FC-4) as the cotemplates and tetraethyl orthosilicate (TEOS) as the siliceous precursor. According to transmission electron microscopy, X-ray diffraction, and N₂ sorption analysis, the formation of the multilayered silica vesicles passed through the route of the normal mesoporous silica spheres (MCM-41) to irregular hexagonal structures with cavities inside MCM-41 spheres and finally to the small-sized multilayered siliceous vesicles with the increase of FC-4/CTAB molar ratio. The possible mechanism of the two kinds of micelles cooperation was discussed. The synthesized silica vesicle spheres were 30−40 nm with a few shells that may facilitate the transport of the molecules. Furthermore, the vesicular structure was also obtained by aging at 150 °C, which maintained high surface area even after hydrothermal treatment in boiling water for 48 h. The higher hydrothermal stability, high surface area, and pore volume would benefit the loading of catalysts and increase the adsorption capacity.