Preparation of lamellar mesoporous silica microspheres via SDS templates

摘要

The silica microspheres were prepared by sodium silicate (Na_2O·XSiO_2) and (NH_4)_2SO_4 with sodium dodecyl sulfonate (SDS, C_(12)H_(25)SO_3Na) micelles as templates in ethanol-water solvent. The existence of regular arrays of lamellar mesoporous structure was detected by X-ray diffraction (XRD). Then the morphology of SiO_2 microspheres was observed by scanning electron micrograph (SEM). The average diameter of SiO_2 microspheres is 0.2 μm. Content of ethanol, of templates, system temperature and aging time have influence on the formation of the lamellar mesoporous structure. In addition, the best volume ratio of ethanol:water is 1:1.