单分散球形SiO2颗粒的制备及表征  

Preparation and Characterization of Monodispersed and Spherical SiO_2 Particles

作　　者：黄征[1] 官建国[2] 刘亚青[1] 

机构地区：[1]中北大学山西省高分子复合材料工程技术研究中心,太原030051 [2]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《硅酸盐通报》2008年第5期977-981,共5页Bulletin of the Chinese Ceramic Society

基　　金：教育部“新世纪优秀人才支持计划”([2005]290)资助项目;国防预研基金项目(51447020105QT6903)

摘　　要：以氨水作催化剂,采用溶胶-凝胶法制备出单分散、粒径约300～500nm的亚微SiO2粒子。研究了氨水浓度、乙醇用量、正硅酸乙酯/水的体积比及硅烷偶联剂浓度对SiO2粒子粒径、分散度及其表面结构的影响,同时还研究了SiO2胶体粒子的稳定性能和成核生长机理。结果表明:SiO2粒子粒径随氨水浓度的增加,先增大后减小,分散度增大;且随着乙醇用量的增加,粒径减小,分散度下降。硅烷偶联剂的加入使得SiO2胶体粒子表面有机成分增多,疏水性增强,其水乳液在常温下不能长久放置,且硅烷偶联剂浓度愈高,粒子间愈容易发生黏连。Monodispersed submicrospheres of silica in the size range of 300 - 500 nm were synthesized by Sol-Gel in the presence of ammonia. The effects of the concentrations of ammonia and silane coupling agent, the dosage of ethanol and the volume rate of tetra-ethoxysilane/water on the diameter, dispersion coefficient and the surface structure were studied. The stability properties and the formation mechanism of silica were also studied. The results show that the size of silica increases at first then decreases and the dispersion coefficient increases with increasing of concentration of ammonia. What＇s more, the size and the dispersion coefficient decrease with the increase of ethanol. The organic components of the surface increase and the hydrophobicity strengthen with adding placed of the silane coupling agent. The solution cant be for long time at the room temperature and with increasing the concentration of silane coupling agent, the particles will be conglutinated easily.

关 键 词：溶胶-凝胶法 硅烷偶联剂 二氧化硅 正硅酸乙酯 

分 类 号：TQ127[化学工程—无机化工]