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Large, hard, transparent, mesoporous silica spheres are synthesized in one step by using oil-in-water emulsion chemistry under basic conditions with cationic surfactants and (n-BuO)4Si. The pores are shown by TEM and nitrogen absorption studies to be monodispersed in size, with total surface area over 1000 m2/g.
Huo et al. (Wed,) studied this question.