中文摘要：

研究硅溶胶的雾化方法和形成油包水的乳化体系,在乳化体系中加入凝胶剂制备SiO2湿凝胶微球。制得的湿凝胶微球在常温常压下老化3d后用过滤的方法分离湿凝胶微球和油相;用正己烷清洗微球表面的油和杂质,用乙醇除去湿凝胶微球内部的水;最后,用超临界CO2的方法干燥湿凝胶微球得到SiO2气凝胶微球。研究结果表明,该方法最大的优点是可以大规模化制备气凝胶微球,制得的气凝胶微球直径〈50μm,大部分集中在15～35μm之间。SiO2气凝胶微球具有明显的介孔材料特征,孔径为10nm左右,比表面积高达846.14m2/g,堆积密度约为221kg/m3。

英文摘要：

A new method for the preparation of SiO2 aerogels microspheres was studied in this paper.Small sol droplets were produced by atomization SiO2 sol into an oil phase system.At the same time,the oil phase was stirred to accelerate the droplets of dispersion for producing a homogeneous oil-water system.SiO2 wet gel microspheres were obtained by adding ammonia water with stirring the oil phase.The microspheres were aged in ambient temperature and pressure for 3d following separation of oil and microspheres by a filter.Before supercritical drying,SiO2 wet gel microspheres needed for washing and solvent exchange to remove oil and water.The results show that this method can produce SiO2 aerogels microspheres on a large scale.Obtained aerogels microspheres were less than 50μm in diameter,mostly in the 15-35μm.Microspheres with the characteristics of mesoporous materials,the pore size of about 10nm,specific surface area of up to 846.14m2/g and the packing density of about 221kg/m3 were produced using the presented method.