反相微乳液制备纳米SiO_2颗粒

Silica nanoparticles preparation through reverse microemulsion

微乳液法可以控制纳米颗粒的粒度,在AOT作为表面活性剂的微乳液体系中引入助表面活性剂正丁醇和戊醇,对生成的纳米颗粒起到保护作用,能够形成大小均一、分散良好的纳米SiO2颗粒。随着正丁醇含量的增加纳米SiO2球形颗粒的粒径变大,正丁醇加量0.5mL时粒径为18.7nm,正丁醇加量增加到3mL时粒径达109nm。随着时间的增加,微乳液法制备的纳米SiO2粒径基本保持稳定,而且颗粒变得更加均匀。

The size of the nanoparticles can be controlled by microemulsion method. In the AOT microemulsion system, the addition of n-butanol and n-pentanol as cosurfactant can protect the nanoparticle and formed a uniform SiO2 nanoparticles with good dispersion. SiO2 spherical nanoparticles became larger with the increasing of n-butanol content. A particle size of 18.7nm was obtained when n-butyl alcohol was 0.5mL and the particle size was about 109nm when n-butanol added amount increased to 3mL. As time increased,the size of SiO2 nanoparticles remained stable, and the particles became more uniform.