| 制备条件对SiO_2气凝胶孔结构的影响 |
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| 引用本文： | 张煜,曹建新,聂登攀,杨成武,陈肖,赵领,刘延友. 制备条件对SiO_2气凝胶孔结构的影响[J]. 稀有金属材料与工程, 2009, 38(Z2) |
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| 作者姓名： | 张煜 曹建新 聂登攀 杨成武 陈肖 赵领 刘延友 |
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| 作者单位： | 1. 贵州大学,贵州,贵阳,550003
2. 贵州省冶金化工研究所,贵州,贵阳,550002 |
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| 基金项目： | 贵州省优秀教育科技人才省长基金项目;，贵州省工业攻关项目 |
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| 摘 要： | 采用溶胶-凝胶法及超临界流体干燥技术制备了SiO_2气凝胶,系统地考察了醇硅比、水硅比、体系pH值及HF用量等制备条件对SiO_2气凝胶孔径分布及孔型结构的影响.结果发现,随着水量的增加气凝胶的孔径分布逐渐变窄,孔型趋于一致.乙醇不参与溶胶-凝胶反应,醇硅比的增加不会对SiO_2气凝胶的孔径分布和孔结构产生剧烈影响.在较低pH值或弱碱性范围内,pH值对孔型结构的影响较小,制得的气凝胶孔径分布较窄,孔型均一,当pH值＞8.5以后,不利于气凝胶网络结构的形成和均匀分布.HF用量的减少会使得气凝胶的孔径和孔型趋于向宽分布和多样化变化,但变化幅度不是太大.
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| 关 键 词： | SiO_2气凝胶 溶胶-凝胶法 超临界 孔结构 |
Effect of Preparation Condition on Pore Structure of SiO_2-Aerogel |
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| Zhang Yu,Cao Jianxin,Nie Dengpan,Yang Chengwu,Chen Xiao,Zhao Ling,Liu Yanyou. Effect of Preparation Condition on Pore Structure of SiO_2-Aerogel[J]. Rare Metal Materials and Engineering, 2009, 38(Z2) |
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| Authors: | Zhang Yu Cao Jianxin Nie Dengpan Yang Chengwu Chen Xiao Zhao Ling Liu Yanyou |
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| Affiliation: | Zhang Yu1,Cao Jianxin1,Nie Dengpan2,Yang Chengwu1,Chen Xiao1,Zhao Ling1,Liu Yanyou1 (1. Guizhou University,Guiyang 550003,China) (2. Guizhou Institute of Metallurgy , Chemical Engineering,Guiyang 550002,China) |
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| Abstract: | SiO2-aerogel was prepared via sol-gel method and ethanol supercritical drying. The influence of the pH value of the original hydrogel,the ratio of EtOH/TEOS,H2O/TEOS and HF/TEOS on the pore size distribution and pore structure of aerogel were investigated. The results showed that the pore size distribution and pore structure of aerogel were tending to become homogeneous with the increase of the water. For the diluted function of the ethanol,the effect of it on the pore size distribution and pore structure w... |
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| Keywords: | SiO_2-aerogel sol-gel method supercritical drying porous structure |
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