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Fabrication and characterization of hexagonal mesoporous silica monolith via post-synthesized hydrothermal process

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Abstract

Large-sized, optical transparent mesostructured Brij 56/silica monolith has been fabricated using a lyotropic liquid crystal of Brij 56 (C16EO10) as a template and TMOS as a silica source, combined with a optimizing sol-gel process and a hydrothermal aging process. By programmed temperature drying and calcinations, translucent mesoporous silica monolith with two-dimensional hexagonal structure (P6mm) has bee obtained. The ordered mesoporous silica monoliths have been characterized by small-angle X-ray diffraction, transmission electron microscopy (TEM), and nitrogen adsorption, which shows that the materials have a highly ordered two-dimensional hexagonal mesostructure with the high specific surface area of 837 m2 · g−1 and narrow pore distribution with a mean BJH pore diameter of 2.73 nm. Based on calculations and differential scanning calorimetry and thermogravimetric analyses, the action mechanism of the hydrothermal aging process has been proposed: the 100°C hydrothermal conditions and autogenous 2.3 atm pressure promote the condensation and dehydration of silanol groups, with the result that cross-linking degree, the flaws and moisture content in gels are reduced notably. Those processes guarantee the integrity of gels in the following drying process.

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Authors and Affiliations

  1. Department of Applied Chemistry, Wuhan University of Technology, Wuhan, 430070, China

    Jia-Heng Lei, Dan Liu, Li-Ping Guo, Xue-Min Yan & Hui Tong

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  1. Jia-Heng Lei
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  2. Dan Liu
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  3. Li-Ping Guo
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  4. Xue-Min Yan
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  5. Hui Tong
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Correspondence to Dan Liu.

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Lei, JH., Liu, D., Guo, LP. et al. Fabrication and characterization of hexagonal mesoporous silica monolith via post-synthesized hydrothermal process. J Sol-Gel Sci Technol 39, 169–174 (2006). https://doi.org/10.1007/s10971-006-7745-8

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  • DOI: https://doi.org/10.1007/s10971-006-7745-8

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