| 自疏水溶胶-凝胶体系制备疏水SiO2气凝胶 |
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| 引用本文： | 陈一民,谢凯,洪晓斌,肖加余. 自疏水溶胶-凝胶体系制备疏水SiO2气凝胶[J]. 硅酸盐学报, 2005, 33(9): 1149-1152 |
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| 作者姓名： | 陈一民 谢凯 洪晓斌 肖加余 |
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| 作者单位： | 国防科技大学航天与材料工程学院,长沙,410073;国防科技大学航天与材料工程学院,长沙,410073;国防科技大学航天与材料工程学院,长沙,410073;国防科技大学航天与材料工程学院,长沙,410073 |
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| 基金项目： | 航天基金（2002HT006）资助项目. |
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| 摘 要： | 以聚二乙氧基硅氧烷（polydiethoxysiloxane,PDEOS）和甲基三乙氧基硅（methyltriethoxysilane,MTES）,以及氨水、水和乙醇组成自疏水的溶胶-凝胶体系,经过溶胶-凝胶过程可形成疏水的二氧化硅凝胶,经正己烷溶剂交换后,可在常压条件下干燥后得到疏水二氧化硅气凝胶.研究表明：自疏水溶胶-凝胶体系中TMES/PDEOS的质量比大于0.3时,可得到疏水二氧化硅气凝胶,其密度和比表面积分别为380～420 kg/m^3和965～1 020 m^2/g.
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| 关 键 词： | 二氧化硅 气凝胶 自疏水 常压干燥 |
| 文章编号： | 0454-5648（2005）09-1149-04 |
| 收稿时间： | 2002-02-28 |
| 修稿时间： | 2005-06-05 |
PREPARATION OF HYDROPHOBIC SiO2 AEROGEL FROM SELF-HYDROPHOBIC SOL - GEL SYSTEM |
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| CHEN Yimin,XIE Kai,HONG Xiaobin,XIAO Jiayu. PREPARATION OF HYDROPHOBIC SiO2 AEROGEL FROM SELF-HYDROPHOBIC SOL - GEL SYSTEM[J]. Journal of The Chinese Ceramic Society, 2005, 33(9): 1149-1152 |
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| Authors: | CHEN Yimin XIE Kai HONG Xiaobin XIAO Jiayu |
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| Abstract: | The sol-gel process was used to prepare hydrophobic SiO_(2) gels of a self-hydrophobic sol-gel system consisting of polydiethoxysiloxane(PDEOS),methyltriethoxysilane(MTES),alcohol,NH_(3) H_(2)O and H_(2)O.After solvent exchange with n-hexane,the obtained hydrophobic SiO_(2) gels were dried at ambient pressure to prepare hydrophobic SiO_(2) aerogels.The research results show that when the mass ratio of MTES/PDEOS in the self-hydrophobic sol-gel system is higher than 0.3,the obtained SiO_(2) aerogels are hydrophobic,and their densities and specific surface areas are in the range of 380 to 420 kg/m~(3) and 965 to 1 020 m~(2)/g,respectively. |
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| Keywords: | silicon dioxide aerogel self-hydrophobic ambient drying |
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