Highly ordered MSU-X type mesoporous silica was synthesized by using ethoxylated derivatives of fatty esters of sorbitan (Tween 20) as template via a two-step pathway under mildly acidic conditions (pH=3.32-4.26) without the addition of fluoride. The template concentration (ca 2% (w)) is much lower than for conventional synthetic routes and the synthetic medium is much simpler than that used for other two-step pathways. The obtained materials have high specific surface areas, large pore volumes, and thick pore walls. Transformations of exterior morphologies and inner structure of mesoporous silica were found by varying the pH and keeping all other conditions constant.%采用两步法以非离子型表面活性剂 Tween 20 为模板剂合成基介孔材料,研究了 pH 对介孔材料结构的影响.结果表明,没有氟离子存在且模板剂浓度较低(约为2%(w))的条件下,在弱酸性环境中(pH=3.32-4.26)可以制备有序的 MSU-X 类硅基介孔材料,本研究中的简单合成体系有助于查明 MSU-X 合成机理.对所得介孔材料测试表明,在同样的合成体系中,随着体系pH的变化,所得硅基介孔材料的形貌和孔壁结构都发生了变化.
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