摘要
以正硅酸乙酯为硅源,通过酸碱两步催化法结合超临界干燥工艺制备SiO2气凝胶,并研究了溶胶配比和超临界干燥工艺对SiO2气凝胶微观结构的影响。结果表明,通过改变正硅酸乙酯、乙醇、水、酸碱催化剂的摩尔比和超临界干燥中的保温时间、放压速率,可以对SiO2气凝胶的比表面积、孔径、孔容以及颗粒粒径进行可控调节。最后制备出了不同比表面积(200~1100 m2/g)、不同孔尺寸(6.2~19.6 nm)以及不同颗粒粒径(5.7~27.2 nm)的SiO2气凝胶。
We report a facile approach to synthesize silica aerogel through two-step base/acid catalyzed sol-gel process followed by supercritical drying using tetraethyl orthosilicate as precursor.The effects of the distribution ratio and the supercritical process on the microstructure of SiO2 aerogel were studied.The results indicated that the specific surface area,pore volume and pore diameter of SiO2 aerogel is controllable and can be adjusted by changing the molar ratio among ethyl silicate,ethanol,water,acid and base catalysts,as well as the heat preservation time and pressure release rate in the supercritical drying process.SiO2 aerogels with different specific surface areas(200~1100 m2/g),different nano particle sizes(6.2~19.6 nm)and different pore size distribution(5.7~27.2 nm)were successfully prepared.
作者
余煜玺
马锐
王贯春
张瑞谦
彭小明
Yu Yuxi;Ma Rui;Wang Guanchun;Zhang Ruiqian;Peng Xiaoming(Fujian Key Laboratory of Advanced Materials,Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen,Fujian,361005,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2020年第S01期140-146,共7页
Nuclear Power Engineering
