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以十六烷基三甲基氯化铵(CTAC)为模板剂,正硅酸乙酯(TEOS)为硅源,甲醇为共溶剂,氢氧化钠为催化剂,采用水热法制备出不同粒径、单一分散、高度有序的介孔SiO2微球,并利用扫描电子显微镜(SEM)对所制备的微球进行表征。考察了体系中CTAC浓度、TEOS浓度、甲醇的比率和温度等条件对所制备的SiO2微球的粒径及分散性的影响。同时采用XRD、BET、HRTEM等手段对样品进行分析表征。结果表明合成的单分散球形SiO2具有有序的六方相介孔结构,并且具有较高的比表面积。
Using cetyltrimethylammonium chloride (CTAC) as template, TEOS as silica source, methanol as co-solvent and sodium hydroxide as catalyst, hydrothermal method was used to prepare different particle size , Monodisperse and highly ordered mesoporous silica microspheres. The prepared microspheres were characterized by scanning electron microscopy (SEM). The effects of CTAC concentration, TEOS concentration, methanol ratio and temperature on the particle size and dispersity of the prepared microspheres were investigated. At the same time, the samples were analyzed by XRD, BET, HRTEM and other means. The results show that the synthesized monodisperse spherical SiO2 has an ordered hexagonal mesophase structure and has a high specific surface area.