以TEOS为原料, 以表面活性剂CTAB与十二胺的混合物为模板剂, 以C2H5OH、C3H7OH和H2O为共溶剂, 在弱碱性条件下制备出单分散SiO2介孔微球. 通过调变模板剂用量以及共溶剂的比例, 所得微球粒径在0.2～1.5μm范围内可调节. 并采用semi-batch(半间歇加料)方法进一步生长微球, 使其粒径增大到3μm. 此类微球具有3nm的平均孔径和较高的比表面积, 有望作为高效液相色谱(HPLC)的固定相而得到广泛应用. 在以上实验的基础上, 本文进一步讨论了SiO2 微球生长过程中的若干理论问题.
A one-step synthesis of mono-dispersed mesoporous silica spheres by using the mixed surfactants CTAB and dodecylamine proceeded with the hydrolysis and condensation of tetraethylorthosilicate (TEOS) in a mixture of alcohol, isopropyl alcohol, water, and ammonia as a catalyst. The silica spheres have high specific
surface area and can be used as a good substrate in high performance liquid
chromatography (HPLC). The size of 0.2～1.5μm and morphology of the silica spheres can be controlled by varying the proportion of surfactant and co-solvent. The prepared silica spheres can be enlarged to the maximum diameter 3μm with a seeded growth method in a semi-batch reacting system. Based on the experiments above, several mechanisms were discussed on the growth
process of mesoporous silica spheres in the synthesis.
参考文献
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