微乳液法制备无定形纳米二氧化硅  

The preparation of amorphous silica nanoparticls by microemulsion method

作　　者：朱振峰[1] 李晖[1] 朱敏[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西咸阳712081

出　　处：《无机盐工业》2006年第6期14-16,共3页Inorganic Chemicals Industry

基　　金：陕西省自然科学基金资助(2004E106);陕西科技大学科研创新基金资助(SUST-B06)

摘　　要：采用Triton X-100／正己醇／环己烷／氨水体系配制反相微乳液，在碱性条件下正硅酸乙酯在反相微乳液中发生受控水解，合成了具有无定形结构的球形二氧化硅纳米粒子。通过红外光谱（FT-IR）、X衍射（XRD）、透射电镜（TEM）分别对样品的结构及形貌尺寸进行了表征和分析。结果表明：改变表面活性剂加入量可以得到不同粒径（50～110nm）、不同粒度分布及不同分散程度的球形二氧化硅纳米粒子。随着表面活性剂在微乳液中体积分数的增大，二氧化硅纳米粒子的粒径先减小后增大，团聚程度也呈现先减小后增大的趋势。当表面活性剂在微乳液体系中的体积分数为20％时，所合成的二氧化硅纳米粒子粒径最小（50nm），粒度均匀且呈现出良好的分散性。The amorphous sphere silica nanopartieles were produced by hydrolysis of tetraethoxysilane （TEOS） under alkalic condition in reverse microemulsion formed by the system of Triton X - 100/hexanol/cyclehexane/amomia water. The structure of prepared samples was confirmed by FF - IR and XRD, and the morphology and size were characterized by TEM. The results show that amorphous silica nanoparticles with different size ,different size distribution and different dispersity can be obtained through adjusting the surfactant content. With the increase of surfactant volume percentage,the average particle size of silica can be decreased first and then increased, the aggregation degree of silica particles can also be decreased at first and then shows a tendency of increase. When the surfactant volume percentage is 20% ,the produced silica nanoparticles with minimum diameter （50 nm） show good dispersity as revealed by TEM.

关 键 词：微乳液 纳米粒子 二氧化硅 

分 类 号：TQ127.2[化学工程—无机化工]