| 常压干燥法制备SiO2气凝胶粉体 |
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| 引用本文： | 王冬冬,丁书强,王自强,王泽华,陈伟.常压干燥法制备SiO2气凝胶粉体[J].耐火材料,2011,45(2). |
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| 作者姓名： | 王冬冬 丁书强 王自强 王泽华 陈伟 |
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| 作者单位： | 中钢集团洛阳耐火材料研究院有限公司,先进耐火材料国家重点实验室,河南洛阳,471039 |
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| 基金项目： | "863"支持项目，国家自然科学基金青年基金项目 |
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| 摘 要： | 以工业硅溶胶为原料,通过凝胶过程与干燥条件的控制,采用常压干燥法制备了SiO2 气凝胶粉体,并考察了老化液中正硅酸乙脂(TEOS)含量和干燥控制化学添加荆甲酰胺的添加对气凝胶粉体堆积密度、比表面积和孔径分布的影响.结果表明:所得气凝胶粉体具有纳米多孔结构,组成气凝胶结构的基本粒子呈圆球形,粒径为10～25 nm,由基本粒子连接而成的网络结构具有5～50 nm的孔径分布;随着热处理温度从常温升至1 100℃,SiO2气凝胶从最初的无定形态转化为方石英;在,TEOS的醇溶液中老化,有利于增强凝胶骨架的强度;添加甲酰胺可以改善气凝胶粉体的孔径分布,提高其比表面积.
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| 关 键 词： | SiO2气凝胶 常压干燥 干燥控制添加剂 |
Preparation of silica aerogel powder by ambient pressure drying |
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| Wang Dongdong,Ding Shuqiang,Wang Ziqiang,et al State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang ,Henan,China.Preparation of silica aerogel powder by ambient pressure drying[J].Refractories,2011,45(2). |
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| Authors: | Wang Dongdong Ding Shuqiang Wang Ziqiang State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co Ltd Luoyang Henan China |
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| Affiliation: | Wang Dongdong,Ding Shuqiang,Wang Ziqiang,et al State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China |
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| Abstract: | Silica aerogel powder was prepared from industrial silica sols by ambient pressure drying and controlling the gelatin process and drying conditions.The effects of tetraethoxysilane(TEOS) content in aging solution and the drying control chemical additive(DCCA) on the density,specific surface,and pore size distribution of the SiO2 aerogel powder were investigated.The results show that:(1)the aerogels are nano-porous net structure of the spherical primary nanoparticles of 10-25 nm and the nano-metric pores of ... |
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| Keywords: | Silica aerogel Ambient pressure drying Drying control chemical additive |
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