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二氧化硅多孔介质气凝胶和干凝胶的分形结构研究
引用本文:沈军,王珏,吴翔.二氧化硅多孔介质气凝胶和干凝胶的分形结构研究[J].物理学报,1996,45(9):1501-1505.
作者姓名:沈军  王珏  吴翔
作者单位:同济大学波耳固体物理研究所;同济大学波耳固体物理研究所;同济大学波耳固体物理研究所
基金项目:国家自然科学基金及中国工程物理研究院科学技术基金资助的课题.
摘    要:二氧化硅多孔介质气凝胶和干凝胶的结构用小角X射线散射进行了研究.实验表明,用一步法制备的各种气凝胶全部具有分形结构.而干凝胶和用两步法制备的气凝胶没有分形结构.实验还证明干凝胶由尺度较大的球形颗粒组成

关 键 词:二氧化硅  分形  多孔  气凝胶  干凝胶  分子结构
收稿时间:1995-07-14

STUDY ON FRACTAL STRUCTURE OF POROUS SILICA:AEROGELS AND XEROGELS
SHEN JUN,WANG JUE and WU XIANG.STUDY ON FRACTAL STRUCTURE OF POROUS SILICA:AEROGELS AND XEROGELS[J].Acta Physica Sinica,1996,45(9):1501-1505.
Authors:SHEN JUN  WANG JUE and WU XIANG
Abstract:Porous materials silica aerogels and xerogels were obtained through a sol-gel process from TEOS. Samples derived from different preparation circumstances were investigated via small-angle X-ray scattering. The power-law dependence of the scattered intensity, a characteristic of fractal structures, was observed for all the one-step aerogels. While for the xerogels and aerogels derived from a two-step sol-gel process, the power-law dependence of the scattered intensity was not observed. The xerogels are found to consist of a number of large spherical particles which were densely packed together.
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