摘要： 采用一步法制备了亚微米纯二氧化硅微球及 8 种有机硅表面修 饰的二氧化硅微球，用扫描电镜、氮吸附、零电荷点测定等方法对微球 进行了表征，对比研究了微球在不同介质中的分散性能。所有微球都呈 球形，形貌较好，依表面修饰基团的不同，粒子直径在 0.42~0.54 nm 之 间。 所有微球均为实心，比表面积均小于 21 m²/g。 微球的零电荷点在 8.25~8.93 之间变化。 粒子经过表面修饰后，在不同介质中表现出了不 同的分散行为， 微球的分散行为可以由微球的亲水及疏水性， 以 及 DLVO 理论得到基本解释。 

关键词：表面修饰；二氧化硅微球；分散；团聚

Abstract：The pure submicrometer silica spheres and eight kinds of surface modified submicrometer silica spheres were prepared through a one-step process. Scanning electron microscopy（SEM）， nitrogen sorption， and the determination of point of zero charge （PZC） were used to characterize the modified and pure silica particles. The dispersion behavior of the particles in different media was investigated. The SEM images of the particles demonstrated that all the particles were spherical particles with good shape. The diameter of the particles ranged from 0.42 to 0.54 nm depending on the surface modification groups. All the particles were nonporous particles with a surface area smaller than 21 m²/g， and a PZC between 8.25 and8. 93. After modification， the particles presented different dispersion be havior， which were basically explained by considering the hydrophilicity and hydrophobicity of the particles and the DLVO theory. 

Keywords：surface modification； silica sphere； dispersion； coagulation