摘要
以Stber法为基础,采用醇作溶剂,通过正硅酸乙酯在氨水催化下水解缩聚和一定的后处理得到了SiO2微球,用透射电子显微镜(TEM)对样品的形貌和粒度进行了表征。结果表明,以甲醇、乙醇和正丁醇为溶剂均可以合成单分散的SiO2微球,而以正丙醇为溶剂合成的SiO2微球容易聚集;在其它条件不变的情况下,球形颗粒的粒径随硅源浓度和氨水浓度的增加而增大,随水浓度的增大粒径变化很小。研究和讨论了SiO2颗粒在不同反应条件下的形成机理。
Based on the well-known Stber method, silica microspheres were prepared by hydrolysis of tetraethoxy silane （TEOS） in mixed alcohol-water solvents using ammonia as a catalyst. Silica microspheres were obtained and the products were investigated by transmission electron microscopy （TEM）. The results show that the monodispersed silicon dioxide spherical particles could be obtained in methanol, ethanol and n-butanol, while agglomerated silicon dioxide particles were formed in I-propanol. When the concentrations of TEOS and ammonia are increased, the particle sizes increase. Increasing the concentrations of water leads to little change in the silica particle sizes. The formation mechanisms of the resultant SiO2 particles under different reaction conditions were carefully investigated and discussed.
出处
《陶瓷学报》
CAS
北大核心
2010年第1期75-78,共4页
Journal of Ceramics
