| 引用本文: | 陈一民,谢凯,洪晓斌,等.常压干燥制备疏水SiO2气凝胶.[J].国防科技大学学报,2005,27(2):11-14.[点击复制] |
| CHEN Yimin,XIE Kai,HONG Xiaobin,et al.Preparation of Hydrophobic SiO2 Aerogels at Ambient Pressure[J].Journal of National University of Defense Technology,2005,27(2):11-14[点击复制] |
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| 常压干燥制备疏水SiO2气凝胶 |
| 陈一民, 谢凯, 洪晓斌, 肖加余 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 以聚二乙氧基硅氧烷(PDEOS)为原料，用甲基三乙氧基硅烷(MTES)对制得的醇凝胶进行表面改性，经乙醇和正己烷洗涤，在常压条件下干燥后得到疏水二氧化硅气凝胶。研究表明：溶胶—凝胶体系中各组分的最佳配比为C2H5OH∶PDEOS∶HF∶H2O=20∶10∶3∶0.5(重量比)；当MTES/ PDEOS(重量比)大于1.2时，经表面改性的疏水二氧化硅气凝胶与水的接触角大于110°，其密度和比表面积分别在125～160kg/m3和560～900m2/g范围。 |
| 关键词: 二氧化硅 气凝胶 疏水 常压干燥 |
| DOI： |
| 投稿日期：2004-10-09 |
| 基金项目:航天支撑技术基金资助项目(2002-HT-GFKD-006)；国防科技大学校预研资助项目 |
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| Preparation of Hydrophobic SiO2 Aerogels at Ambient Pressure |
| CHEN Yimin, XIE Kai, HONG Xiaobin, XIAO Jiayu |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The alcogel prepared by sol-gel process of polydiethoxysiloxane (PDEOS) according to the mass ratio of C2H5OH∶ PDEOS∶HF∶H2O=20∶10∶3∶0.5, was modified by methyltriethoxysilane(MTES) and washed with alcohol and n-hexane. The obtained gel was then dried under ambient pressure to prepare hydrophobic SiO2 aerogel. It is shown that hydrophobic SiO2 aerogels can be obtained when the mass ratio of MTES/ PDEOS is higher than 1.2. The contact angle between hydrophobic SiO2 aerogels and water is larger than 110°, the densities and specific surface areas of hydrophobic SiO2 aerogels are in the range of 125～160kg/m3 and 560～900m2/g respectively. |
| Keywords: silicon dioxide aerogel hydrophobic ambient drying |
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