关键词: 化学沉淀法;SiO2微粉;ξ－电位;工艺条件

Abstract: The nano－SiO2 powders were prepared from water－glass and HClsolution by means of adding surfactant by precipitation process at a suitable pH value and temperature. The research on the optimum technology is very important to obtain the nano－SiO2 powders with excellent properties. BDL－B type potential instrument，BET，EPMA－electronic probe，DTA－TGA，TEM and some other experiment methods were used to investigate the structure and properties of the samples.The experiments showed that the obtained ultrafine SiO2 powders present porous particles with particle size＜100nm，specific surface area more than 100m2／g，the pore diameter about 25Åand well－distributed.