改性微粒硅溶胶的结构和形态

Structure of Modified Silica Sol

用IR谱2、9Si-NMR1、1B-NMR和27Al-NMR谱及透射电镜对铝改性硅溶胶与硼改性硅溶胶进行了结构形态与特征的分析研究,首次提出了铝改性硅溶胶与硼改性硅溶胶的结构和形态特征。铝改性硅溶胶胶粒中的Al主要是以与[SiO4]四面体相连接的[AlO4]四面体的形式存在。硼改性硅溶胶胶粒中的硼主要以与4个硅原子相连接的[BO4]四面体的形式存在,同时还有与3个硅原子相连接的[BO4]四面体的形式。铝、硼改性硅溶胶带有强负电性,颗粒是无定型的,粒径在3 nm左右,属于微粒粒子。

The structures of ahminium modified sihca sol （AMS） and boron modified silica sol （BMS） were investigated with IR, ^29Si-NMR,^11 B- NMR, ^27Al-NMR spectra and TEM（transmission electron microscopy） for the firstt time. Aluminium in AMS particles is mostly in the form of [AlO4] tetrahedron connected with [ SiO4 ], while boron in BMS particles is in the form of [ BO4 ] tetrahedron connected with three silicon atoms or four silicon atoms. AMS and BMS present strong negative charge and the particles are amorphous whose size is about 3 nm belonging to microparticle.