摘要
以正硅酸乙酯（ＴＥＯＳ）为原料，利用二步法制备低密度ＳｉＯ２凝胶。研究不同溶液配比对凝胶化过程的影响，分析Ｃ２Ｈ５ＯＨ、（ＣＨ３）２ＣＯ和ＣＨ３ＣＮ为稀释溶剂形成凝胶的特点，结合ＣＯ２超临界干燥处理，制备出密度小于１０ｋｇ／ｍ３的超低密度ＳｉＯ２气凝胶，并与传统一步法制备的ＳｉＯ２气凝胶进行了结构比较。
Low density SiO2 gels are prepared by a two-step sol-gel process from TEOS. The influence of various solution ratios oil the gelation process is investigated. The comparative characterization of gels using different solvent, such as ethanol, acetone and methyl cyanide, is also given. The ultralow-density SiO2 aerogels with density less than 10 kg/m3 are prepared by CO2 supercritical drying technique. The structure difference between SiO2 aerogels prepared by conventional singlestep process and the two-step process is also presented.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1996年第1期41-45,共5页
Atomic Energy Science and Technology
基金
国家高技术强激光领域基金
中国工程物理研究院科学基金
关键词
气凝胶
二步法
二氧化硅
SiO_2 aerogel Sol-gel process Two-step process Ultralow-density
