原位SAXS/WAXS用于溶胶凝胶-常压干燥法制备氧化锆气凝胶的研究

项目名称： 原位SAXS/WAXS用于溶胶凝胶-常压干燥法制备氧化锆气凝胶的研究

项目编号： No.U1332107

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 李志宏

作者单位： 中国科学院高能物理研究所

项目金额： 70万元

中文摘要： 气凝胶因其特殊的结构和性能而广为关注，阐明气凝胶制备过程的机理是实现其结构和性能可控的关键。本项目拟以无机锆盐为前驱体、以环氧化物为胶凝剂，采用溶胶-凝胶和常压干燥联合连续的方法制备氧化锆气凝胶。应用高强度、高准直性的同步辐射光源，开展SAXS/WAXS同时原位在线测量，跟踪溶胶－凝胶－气凝胶的整个动态过程，获得体系从原子分子尺度至纳米尺度上的结构同时变化的信息，结合其它表征手段，为推测气凝胶制备过程的机理提供基础数据和部分依据。

中文关键词： ZrO2 气凝胶；溶胶-凝胶；常压干燥；同步辐射；小角X射线散射

英文摘要： Aerogels have attracted a great deal of attentions owing to their unique structure and properties. Elaborating the formation mechanism of their microstructure is the key to realize their microstructure tailoring and therefore property control. In this proposal, Zirconia aerogels will be prepared by a continuous sol-gel and ambient pressure drying method using inorganic zirconium salts as Zr precursor and propylene oxide as gel-promoting agent. During preparation of Zirconia aerogels, dynamic evolution of their microstructure at different stages, ie, solution, sol, gel and aerogel, will be probed jointly by in-situ synchrotron small angle and wide angle X-ray scattering with a high beam intensity and high collimation to gain simultaneously the multi-scale microstructure information from atom, molecular and nanometer scale. This structure information together with other observations by ex-situ characterizations will provide basic data and part evidences for deriving microstructure formation mechanism of the Zirconia aerogels.

英文关键词： ZrO2 aerogel；sol-gel；ambient drying process；synchrotron radiation；SAXS