用超重力法制备纳米二氧化硅

以 ＣＯ２气体和水玻璃为原料，采用超重力技术制备纳米级二氧化硅，研究了由超重力反应器碳化沉淀法制备二氧化硅的实验条件对产品粒径的影响，用 ＴＥＭ、 ＩＲ、 ＸＲＤ、 ＤＴＡ—ＴＧ等手段表征了纳米二氧化硅的性能，结果表明，二氧化硅颗粒平均粒径为１７～３０ｎｍ，粒度的分布范围比较窄

PREPARATION OF NANOSIZED SiO2 POWDER BY RPB TECHNOLOGY

Nanosized SiO2 powders were prepared from aqueous sodium silicate solution and carbon dioxide by high gravity reactive precipitation. The influences of processing factors on the particle size distribution of SiO2 powder have been investigated. The structure and physical properties of SiO2 powder have also been characterized through IR, TEM and XRD. It has been found that concentration of the flocculants and aging time have significant influence on the particle size distribution. The concentration of sodium silicate solution and surfactant also affect the particle size. The particle sizes of SiO2 prepared by using this method are within the range of 17-30nm, and the particle size distribution is very uniform.