超低密度SiO2气凝胶的制备研究  

Preparation of ultra-low density SiO2 aerogel

作　　者：鄢林 杨帆[1] 罗炫[1] 张林[1] Yan Lin;Yang Fan;Luo Xuan;Zhang Lin(Research Center of Laser Fusion,CAEP,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心

出　　处：《强激光与粒子束》2020年第3期27-31,共5页High Power Laser and Particle Beams

基　　金：中国工程物理研究院超精密重点实验室基金项目(ZD18001);国家自然科学基金面上项目(11775201)

摘　　要：超低密度的SiO2气凝胶是一种经典的三维网状纳米多孔材料,已经广泛应用于如保温隔热、吸附等多种领域。以四甲氧基硅烷(TMOS)为硅源,采用酸碱两步法,利用乙醇超临界干燥技术制备了超低密度的SiO2气凝胶,分别利用SEM\TEM\BET等表征手段对该气凝胶进行了一系列的研究,发现当其密度为0.6 mg/cm3时,气凝胶拥有最佳的综合性能。该种气凝胶具有超低密度、高比表面积、加工成型性好、制备周期短等优点,有望在激光惯性约束聚变实验中作为冷冻靶发挥巨大的作用。Ultra-low density SiO2 aerogel as a classic three-dimensional network nano-porous material is widely used in many fields such as thermal insulation and adsorption. In this manuscript, tetramethoxysilane(TMOS) is used as the silicon source and an acid-base two-step method is used. Ultra-low density SiO2 aerogels were prepared by ethanol supercritical drying technology, and a series of studies were performed on the aerogels using SEM\TEM\BET and other characterization methods. When the aerogel density was 0.6 mg/cm3, it had the best comprehensive properties. In addition, this aerogel has the advantages of ultra-low density, high specific surface area, good formability, and short preparation cycle. Thus, it is expected to play a significant role as a frozen target in laser inertial confinement fusion experiments.

关 键 词：ICF SIO2 气凝胶 超低密度 

分 类 号：O648[理学—物理化学]