A novel method for tailoring porous structures of nanoporous materials using supercritical solvents
A novel method for tailoring porous structures of nanoporous materials using supercritical solvents
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一种使用超临界溶剂定制纳米多孔材料多孔结构的新方法
DOI：
10.1039/b305653h
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Y. Fukushima
中科院分区：
文献类型：
--
作者：
H. Wakayama;Y. Goto;Y. Fukushima
超临界流体（SCF）用于定制具有均匀孔径的微米和中孔二氧化硅的结构，CnFSM-16（n = 8、10、12和16），其中值n表示模板表面活性剂的烷基链中的碳原子数。 将溶解在超临界CO2或液体乙醇中的二氧化硅前体（正硅酸乙酯（TEOS））浸渍到FSM-16上。在超临界溶剂中涂覆后，所有FSM-16系列的孔径减小。另一方面，通过在液体溶剂中涂布，二氧化硅没有被引入比C12 FSM-16的孔小的孔中。这是阐明在超临界溶剂和液体溶剂的纳米多孔结构的渗透差异。这些结果进行了比较，与那些在超临界溶剂或在液体溶剂中涂覆的各种孔径的活性炭。
Supercritical fluids (SCFs) were used for tailoring the structures of micro- and mesoporous silica with uniform pore sizes, CnFSM-16 (n = 8, 10, 12 and 16), where the value n denotes the carbon atom number in the alkyl chain of the template surfactant. Silica precursors, tetraethylorthosilicate (TEOS) dissolved in supercritical CO2 or in liquid ethanol, were impregnated onto FSM-16. The pore size of all the FSM-16 series decreased after coating in the supercritical solvent. On the other hand, silica was not introduced into pores smaller than that of the C12FSM-16 by coating in the liquid solvent. This is elucidated in terms of the penetration difference into the nanoporous structures of supercritical solvents and liquid solvents. These results are compared with those of activated carbon with various pore sizes coated in supercritical solvents or in liquid solvents.