Abstract
Highly ordered supermicroporous silica was synthesized by short chains cationic trimeric surfactant [C10H21N+(CH3)2(CH2)2N+(CH3)(C10H21) (CH2)2N+(CH3)2C10H21] · 3Br− (denoted C10-2-10-2-10) with a short spacer group (s = 2) as the structure-directing agent and tetraethyl orthosilicate as the precursor. The obtained samples were characterized by small-angle X-ray diffraction, high resolution transmission electron microscopy, and N2 adsorption–desorption. The results showed that the pore structure of the resulting samples belonged to the two-dimensional hexagonal structure (space group 2D-p6mm) with a pore size from 1.92 to 2.16 nm, which was within the supermicroporous range. The high-quality supermicroporous silica was formed at a low molar ratio of C10-2-10-2-10 to tetraethyl orthosilicate (0.08:1), which indicated that the self-assembly ability of C10-2-10-2-10 was stronger than that of corresponding monovalent surfactants. We strictly compared the methods of calculating surface area and pore size of supermicroporous materials, and the surface area was found to be in the range of 910–1,135 m2 g−1 by the αs plot method. With the increase of hydrothermal temperature, the ordering of the supermicroporous structure increased first then decreased, at the same time the pore size was enlarged.
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Acknowledgements
This research is financially supported by the Key Project Foundation of the Ministry of Education of China (No: 105104), the Natural Science Foundation of China (No: 50572057), the Middle-aged and Youthful Excellent Scientist Encouragement Foundation of Shandong (No: 2005BS11003), the Natural Science Foundation of Shandong Province (No: Z2006B02), the Scientific and Technological Development Project of Shandong Province (No: 2007GG20006002).
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Sun, Y., Han, S., Yu, X. et al. Synthesis of highly ordered supermicroporous silica using short-chain cationic trimeric surfactant as structure-directing agent. J Porous Mater 17, 597–603 (2010). https://doi.org/10.1007/s10934-009-9329-9
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DOI: https://doi.org/10.1007/s10934-009-9329-9