Abstract: Nano-sized SiO₂ was surface modified with silane coupling agent KH570. The role of surface modification was characterized by TEM，Zeta potential analysis，and FTIR. It was found that the surface of nano-sized SiO₂ is covered by organic functional groups from KH570. After surface modification，the Zeta potential and dispersion of nano-sized SiO₂ are improved greatly. The statistical size of particle conglomeration of nano-sized SiO₂ is reduced from 200 nm before modification to less than 100nm，stability after the modification.

摘要： 采用硅烷偶联剂KH570对纳米SiO₂实现表面改性，并利用透射电镜（TEM）、粒径分析、Zeta电位、红外光谱（FTIR）等方法对改性后纳米SiO₂的表面结构和在有机介质中的分散稳定性进行分析表征。结果表明，通过硅烷偶联剂KH570表面改性后，颗粒表面覆盖了硅烷偶联剂的有机官能团，提高了SiO₂纳米颗粒在水溶液中的Zeta电位，降低了颗粒团聚程度。改性后的纳米SiO₂粉体在有机溶剂中的团聚块体尺寸明显减小，从200 nm降低到不足100 nm。