中文摘要：

采用原位一步法制备了表面甲基丙烯酰氧基三甲氧基硅烷（MPS）改性的单分散纳米二氧化硅（SiO2）粒子。该过程将纳米SiO2的缩合形成过程与功能化改性同步进行，并用红外光谱（FTIR）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、热失重分析（TGA）等测试方法研究了粒子的表面化学结构、形态和分散性以及粒子中MPS的含量。结果表明，原位一步法制备的MPS改性纳米SiO2粒子粒径约75nm，基本上呈单分散状态，且含有大量的MPS功能性基团，其表面密度为3．45μmol／m^2。

英文摘要：

Mono-disperse γ-Methacryloxypropyltrimethoxysilane （MPS） modified silica nanoparticles have been prepared by an in situ one-step process in which the preparation and modification steps were carried out concurrently. FTIR, XPS, TGA and TEM were used to characterize the chemical structure and morphology of the silica nanoparticles. The results indicated that the nanoparticles were mono-disperse with an MPS organic shell having an external diameter of 75 nm and a surface density of about 3.45μmol/m^2.