摘要
以水玻璃为原料，乙酸乙酯为潜伏酸试剂，用溶胶－凝胶法制备了多孔ＳｉＯ２超细粉体．对乙酸乙酯作为潜伏酸试剂的特点及反应温度和乙酸乙酯用量对硅酸盐聚合形成溶胶和凝胶过程的影响进行了分析和讨论．并用ＴＧ－ＤＴＡ，ＸＲＤ，ＴＥＭ，ＩＲ和氮气吸附对粉体的基本性能进行了测试表征．结果表明，反应温度和乙酸乙酯用量对成溶胶和凝胶的时间有较大影响，在反应温度３０℃、乙酸乙酯与ＳｉＯ２摩尔比为０．６５时，可制得粒径为１０～２０ｎｍ的多孔ＳｉＯ２超细粉体，粉体的ＢＥＴ比表面积为４１４ｍ２／ｇ，孔形状为管状毛细孔，孔径主要在１０～１００ｎｍ范围．
おorous silica ultrafine powders were prepared by solgel method and nbutanol azeotropic distillation process from water glass using ethyl acetate as a latent acidic reagent.The products were characterized by TGDTA,XRD,TEM,IR and nitrogen adsorption.The characteristic of polymerization of silicates to form silica sol and aggregation of silica colloid particles into silica gel in the presence of ethyl acetate was discussed and the effect of reacting temperature and amount of ethyl acetate added on the solgel process was investigated.The experiment results show that reacting temperature and amount of ethyl acetate added have significant influence on solgel formation time.Under the conditions of reacting temperature 30 ℃ and mole ratio of ethyl acetate to silica 065,porous silica ultrafine powders,with particle diameter in the range 10 to 20 nm,BET specific surface area 414 m2/g,and pore size distribution between 10 and 100 nm,can be obtained.
出处
《中南工业大学学报》
EI
CAS
CSCD
北大核心
1998年第2期131-134,共4页
Journal of Central South University of Technology(Natural Science)
