摘要
利用溶胶-凝胶酸碱二步催化法和常压干燥法制备了SiO2干凝胶。反应物的配比是影响SiO2干凝胶制备最基本的因素。为了得到密度最小、孔隙率最大的SiO2干凝胶,本工作设计了一个四因素、三水平的正交实验确定水、无水乙醇、盐酸、氨水等反应物与正硅酸乙酯(TEOS)的摩尔比。同时为了保证所有实验均能在相同条件下发生,确定了其它实验参数。结果表明,SiO2干凝胶制备所需的最优反应摩尔配比为TEOS:水:无水乙醇:盐酸:氨水=1∶4∶10∶7.5×10-4∶0.0375。
Two-step acid-base catalyzed silica xerogels were prepared through sol-gel and ambient pressure drying.Various additive components were main fators which influenced the preparation of silica xerogles.The four-factor,three-level orthogonal test was designed to investigate the effect of the molar ratio of water,alcohol,hydrochloric acid and ammonia for obtaining silica xerogels of the minimal density and the maximal porosity.In order to ensure every experiment to generate under the same process conditions,the other process parameters were also confirmed.The result showed that the optimal mixture molar ratio of TEOS,H_2O,alcohol,hydrochloric acid and ammonia was 1∶4∶10∶7.5×10^(-4)∶0.0375.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2006年第z1期72-74,78,共4页
Journal of Materials Engineering
基金
国家863项目支持(2004AA763020)
新世纪优秀人才支持计划资助(NCET2004)
关键词
二氧化硅干凝胶
正交优化
反应配比
silica
xerogels
orthogonal optimization
reactive mixture ratio
