微乳液法制备纳米二氧化硅粉末  

Preparation of nano-sized SiO_2 particles by microemulsion method

作　　者：骆锋[1] 阮建明[1] 万千[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《粉末冶金材料科学与工程》2004年第1期72-78,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家"863"高技术计划项目(2001AA218011)

摘　　要：采用微乳液法制备了高比表面积纳米SiO2粉末,考察了微乳液体系的配制、反应物浓度、反应温度、焙烧温度、共沸蒸馏脱水工艺对纳米SiO2性能的影响。并通过氮气吸附法(BET)、透射电镜(TEM)、红外光谱分析(IR)、X射线衍射(XRD)等方法对样品进行了表征。研究结果表明,制备粉末的工艺参数对样品性能影响较大,在较佳工艺条件下制备的纳米SiO2粉末近似呈球形,粒径为15-35nm,比表面积达580-630m2／g。共沸蒸馏工艺能完全脱去凝胶中残余的水分,防止因含水胶体干燥引起的粉末硬团聚,从而提高粉末的比表面积。High specific surface area nano-sized SiO2 particles were prepared by microemulsion method, and the effects of conditions, such as the formation of microemulsion, reactant content, reactant temperature, calcination temperature, azeotropic distillation on the property of powder, were studied. The powders were characterized with BET, TEM, IR and XRD. The results show that the influence of the synthesis technology on the property of powder is marked. It is found that the powders are approximately of Spherical grains with the size 15-35 nm and the specific surface area of powder is 580-630 m2/g. The azeotropic distillation process could effectively dehydrate hydrous silica and prevent the formation of the hard agglomerates during the evaporation.

关 键 词：微乳液法 纳米SIO2 共沸蒸馏 

分 类 号：O648.23[理学—物理化学] TQ127.2[理学—化学]