化学沉淀法制备多孔纳米SiO_2粉末

Preparation of hollow nanometer SiO_2 powders by chemical precipitating process

化学沉淀法制备多孔状纳米 SiO2微粉是以水玻璃和盐酸为原料，添加适宜的稳定剂（非离子表面活剂）在适宜的 pH值和温度下沉淀合成 .采用微波干燥后，在适宜的温度下煅烧所得到产品粉末，采用 BDL－ B型电位仪、 BET、 EPMA－电子探针及 DTA－ TGA等手段对其性能进行了表征，结果表明，制得的 SiO2超细微粉，颗粒呈多孔状，具有巨大的比表面积，高达 1000m2/g以上，孔径为 25左右 .粒度分布均匀，粒度可达纳米级，这种粉末具有特殊的性能 .

Ultrafine SiO2 powders are prepared from water- glass and HCl solution through the process of adding surfactant at asuitable pH value and temperature.The research for the optimum technology is very important to obtin SiO2 ultrafine powders with excellent properties.BDL- B type potential instrument,BET,EPMA- electronic probe,DTA- TGA,TEM and some other experiment mehods were used to investigate the structure and properties of the samples.The experiments show that the particles size of the powders is nanometer scale(.