| SiO2气凝胶的常压制备与表面改性 |
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| 引用本文： | 张秀华,赵海雷,何方,李雪,仇卫华,吴卫江,曲选辉.SiO2气凝胶的常压制备与表面改性[J].北京科技大学学报,2006,28(2):157-162. |
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| 作者姓名： | 张秀华 赵海雷 何方 李雪 仇卫华 吴卫江 曲选辉 |
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| 作者单位： | 北京科技大学无机非金属材料系,北京,100083 |
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| 摘 要： | 以水玻璃为硅源,甲酰胺为催化剂,乙二醇为干燥控制化学添加剂(DCCA),采用溶胶-凝胶法常压下干燥制备了硅石气凝胶粉体.研究发现:微过量的甲酰胺,有利于高孔隙率气凝胶的合成;过量的乙二醇的引入不利于低密度气凝胶的形成;pH值对合成气凝胶的性质也有较大的影响.经二甲基二乙氧基硅烷(DMDEOS)表面改性处理后的气凝胶表现出了很好的疏水性能.采用傅里叶变换红外分析(FTIR)、热重分析(TG)、示差扫描量热分析(DSC)等对疏水型气凝胶的结构和性能进行了研究.
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| 关 键 词： | 疏水剂 二氧化硅气凝胶 溶胶凝胶法 常压干燥 表面改性 硅石气凝胶 常压制备 表面改性处理 drying pressure ambient aerogel surface modification 疏水性能 结构 疏水型 示差扫描量热分析 热重分析 FTIR 红外分析 傅里叶变换 表现 二甲基二乙氧基硅烷 影响 性质 |
| 收稿时间： | 2004-12-20 |
| 修稿时间： | 2005-03-14 |
Preparation and surface modification of SiO2 aerogel by ambient pressure drying |
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| ZHANG Xiuhua,ZHAO Hailei,HE Fang,LI Xue,QIU Weihua,WU Weijiang,QU Xuanhui.Preparation and surface modification of SiO2 aerogel by ambient pressure drying[J].Journal of University of Science and Technology Beijing,2006,28(2):157-162. |
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| Authors: | ZHANG Xiuhua ZHAO Hailei HE Fang LI Xue QIU Weihua WU Weijiang QU Xuanhui |
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| Institution: | Department of Inorganic and Nonmetallic Materials, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | SiO_2 aerogel was prepared by using waterglass as the Si source,formamide as the catalyst and glycol as the drying chemical controlling additive(DCCA)via sol-gel method and ambient pressure drying. It is revealed that a certain amount of excessive formamide is favorable for preparation of the aerogel with high porosity,while more excessive glycol can deteriorate the formation of nano-porous SiO_2 aerogel net- work.Additionally,the pH value of the reaction system has a strong impact on the microstructure and properties of prepared SiO_2 aerogel.The aerogel modified with dimethyldiethoxysilane(DMDEOS)shows an excellent hydrophobic feature.The structure and properties of hydrophobic silica aerogel were analyzed by Fourier transform infrared spectra(FTIR),thermogravimetric(TG)and Differential Scanning Calorimetry(DSC). |
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| Keywords: | hydrophobic adsorbent silicon dioxide aerogel sol-gel method ambient pressure drying surface modification |
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