Highly Ordered Supermicroporous Silica
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- 作者：Renliang Wang ; Shuhua Han ; Wanguo Hou ; Lixin Sun ; Jun Zhao ; Youshao Wang
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：July 26, 2007
- 年：2007
- 卷：111
- 期：29
- 页码：10955 - 10958
- 全文大小：193K
- 年卷期：v.111,no.29(July 26, 2007)
- ISSN：1932-7455
文摘
Highly ordered supermicroporous silica (space group 2D-p6mm) was prepared using gemini surfactant [C8H17-N+(CH3)2-(CH2)2-N+(CH3)2-C8H17]·2Br- (denoted C8-2-8) with a short spacer group (s = 2) as the structure-directing agent and sodium silicate as the precursor. The samples were characterized by small-angle X-raydiffraction, transmission electron microscopy, and N2 adsorption-desorption. The results showed that thepore structure of the resulting silica belongs to the two-dimensional hexagonal structure (space group 2D-p6mm) with a pore size of ca. 1.40 nm (in the supermicroporous range). The high-quality supermicroporoussilica was formed at a low molar ratio of C8-2-8 to sodium silicate (0.08:1), indicating that the ability ofself-assembly of C8-2-8 is stronger than that of corresponding monovalent surfactants (single chain, singlehead group). For supermicroporous materials, the methods for calculating surface area and pore size arecritically compared. The surface area was found to be about 1000 m2/g by the 
s plot method. The pore sizeobtained with the HK model was in the range of 1.36-1.62 nm.
s plot method. The pore sizeobtained with the HK model was in the range of 1.36-1.62 nm.