微乳液法制备纳米球形SiO2的正交实验研究

在W/O微乳液体系下,采用TritonX-100作非离子表面活性剂,正丁醇作助表面活性剂、环己烷作油相,正硅酸乙酯为硅源、氨水为催化剂制备了纳米球形SiO2粒子。通过正交试验,采用L9（33）正交表,并运用正交设计的极差分析、方差分析确定各主要原料对制备球形纳米SiO2的影响,找出了对粒径影响显著的因素。实验结果表明：水和表面活性剂摩尔比对粒径影响最显著,并随之增大而增大;正硅酸乙酯浓度、氨水浓度增大,SiO2粒径也随之增大,但影响不显著。实验制取的SiO2粒子粒径在40-120 nm,单分散性好,粒度窄,球形率高。

Study of Spherical Silica in W/O Micro-emulsion Process with Orthogonal Experiment

Nano-spherical silica particles was prepared with W/O microemulsion method in which TritonX-100 was used as non-ionic surfactant, n-Butanol as assistant surfactant, cyclohexane as oil phase, ammonia as catalyst, TEOS as the source of silica. Based on the analysis of the frank plot and the difference of orthogonal design, the influence of the concentration of main raw materials on preparing of nano-spherical silica particles was studied, and most important influences were found out. The results shows that mole ratio of water and surfactant is the main influence on the granularity of silica particles, and the size of silica enhances greatly with the ratio of water and surfactant. When concentrations of TEOS and ammonia increase, they both lead to the growing up of silica particles, but with a much less extent. The prepared silica particles are in 40 -120 nm diameter,spherical,and are dispersed in a narrow scope.