球形SiO2颗粒的合成及反应机理

Preparation and Reaction Mechanisms of Silicon Dioxide Spherical Particles

利用Stober方法合成了球形SiO2颗粒。在乙醇和水的混合溶剂中，以正硅酸乙酯（TEOS）为硅源、氨水作催化剂，在40℃水浴下制备SiO2球形颗粒。通过改变反应物TEOS以及催化剂氨水的加入量，制备了不同粒径的球形SiO2颗粒。利用扫描电镜（SEM）可以看出，随着TEOS和氨水加入量的增加，SiO2颗粒的粒径增大，并探讨了其变化机理。

In this paper,Stober method is used to synthesize SiO2 particles. The ethanol and water are mixed as the solvent,adding TEOS as the silicon source and ammonia as catalyst to the process of the spherical silica particles at 40℃. By increasing the content of TEOS and ammonia, the size of SiO2 particles increases through scanning electron microscopy （SEM）. And the mechanism of the change is discussed.