改进Stber法合成粒径精确控制的二氧化硅纳米粒子(英文)

Size control of silica nanoparticles by modified Stber method

改进了Stber方法合成粒径介于90 nm至200 nm之间的且粒径精确可控的纳米二氧化硅粒子。利用透射电镜(TEM)和动态光散射技术(DLS)研究了原硅酸乙酯的用量、溶剂、催化剂的用量以及搅拌速度对二氧化硅粒子大小及分散性的影响。结果显示这些因素对粒子的粒径以及粒径分布具有重要影响。利用该改进的方法合成的200cm以下的二氧化硅粒子具有极窄的粒径分布,透射电镜显示某一粒径分布下的粒子粒径分布均匀,粒径变化可控制在20 nm以下。

Nearly monodispersed silica nanoparticles with controllable sizes ranging from 90 nm to 200 nm were synthesized via a sol-gel process by improving a classic Stǒber method. The effects of the silica precursor （tetraethylorthosilicate, TEOS）, solvent, catalyst （NH4OH） and stirring speed on the finite size control of the silica nanoparticles were investigated by dynamic light scattering （DLS） and transmission electron microscopy （TEM）. The results showed all these factors had significant effects on the size and size distribution of the silica particles. A good monodispersity can be obtained and the size variation can be controlled within 20 nm.