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采用改进的Stber方法-种子颗粒生长法合成高单分散性、尺寸可控的SiO2微球,该方法克服了Stber方法中SiO2胶体微球成核迅速、对反应条件敏感使最终微球粒径难以控制的缺点,在控制超细颗粒形貌和粒径方面具有显著的优越性。通过精细调制正硅酸乙酯(TEOS)、氨水和去离子水的浓度,探索了在最优条件下制备单分散度较高的SiO2微球的工艺技术,制备出23.4～471.3 nm不同尺寸的SiO2微球。结果表明,SiO2颗粒越小,其形貌越不规则;SiO2颗粒越大,其表面越光滑,单分散性越好。
The improved Stber method - seed particle growth synthesis of highly monodisperse, size controllable SiO2 microspheres, the method overcome St 了ber method SiO2 colloidal microspheres rapid nucleation, the reaction conditions sensitive to the final micro The disadvantage of difficult to control the size of the spherical particles in the control of ultrafine particles morphology and particle size has significant advantages. Through finely adjusting the concentration of TEOS, ammonia and deionized water, the technology of preparing the SiO2 microspheres with higher monodispersity under the optimal conditions was explored, and different sizes of 23.4 ~ 471.3 nm SiO2 microspheres. The results show that the smaller the SiO2 particles, the more irregular the morphology; the larger the SiO2 particles, the more smooth the surface, the better the monodispersity.