超低密度SiO2气凝胶快速制备的新方法  

Rapid Preparation of Ultralow-density Silica Aerogels

作　　者：徐超[1] 周斌[1] 解德滨[1] 沈军[1] 倪星元[1] 徐展[1] 

机构地区：[1]同济大学波耳固体物理研究所,上海200092

出　　处：《材料导报》2006年第6期105-106,110,共3页Materials Reports

基　　金：国家863高技术项目(2003AA84ts03);上海科技启明星计划(05QMX1454);同济大学理科发展基金项目(2003)

摘　　要：以正硅酸乙酯(TEOS)为硅源,采用酸碱二步催化溶胶-凝胶法,结合超临界干燥技术制备了超低密度SiO2气凝胶。通过采用CH3CN为稀释剂,有效地降低了胶凝温度(室温),缩短了胶凝时间,从而达到了快速制备SiO2气凝胶的目的。利用SEM、BET等方法对干燥不同程度的低密度SiO2气凝胶微结构进行了研究。The two step（acid-base）sol-gel process is employed to prepare SiO2 aerogels with TEOS as the precursor, The influence of solvent on the sol-gel proceed is investigated to optimize the experimental conditions. Ultraiow-density silica aerogels with densities as low as 3 mg/cm^3 are made. SEM, BET, pore size distribution techniques are used to characterize the morphology and pore structure of the ultralow-density silica aerogel. The results show that CH3CN can run up gel process and prepare low density silica aerogels rapidly.

关 键 词：超低密度 SIO2气凝胶 制备 

分 类 号：O648.17[理学—物理化学]