Preparation of SiO_2 Nanoparticles by Silicon and Their Dispersion Stability

摘要

Silicon dioxide sol was synthesized by silicon in the presence of alkali catalyst. SiO2 nanoparticles （size in 8-15 nm） aqueous dispersion was prepared by using dispersion and surface modification in situ. The effects of reaction time, temperature, medium pH value, dispersant and surface-modifier on their diameters, sizes distribution and dispersion stability were also studied.The experimental results show that the preparation method can effectively resolve the dispersion stability of SiO2 nanoparticles in water.