| SiO2气凝胶的常压制备及其热传输特性 |
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| 引用本文： | 沈军,汪国庆,王珏,邓忠生. SiO2气凝胶的常压制备及其热传输特性[J]. 同济大学学报(自然科学版), 2004, 32(8): 1106-1110 |
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| 作者姓名： | 沈军 汪国庆 王珏 邓忠生 |
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| 作者单位： | 同济大学,物理系,上海,200092 |
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| 基金项目： | 国家自然科学基金重大资助项目(20133040);国家"八六三"高技术研究发展计划资助项目(2002AA842052);上海市科委国际合作项目(02SL001);上海市重点学科建设基金资助项目;教育部跨世纪人才计划资助项目 |
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| 摘 要： | 以相对廉价的多聚硅 (E - 4 0 )为硅源 ,通过溶胶 -凝胶工艺制备了SiO2 气凝胶 .采用以三甲基氯硅烷(TMCS)为表面修饰剂 ,硅油为干燥介质的表面修饰工艺 ,实现了在常压条件下的制备 .气凝胶热导率的测试采用的是瞬态热线法 ,同时还采用BET(brunaner emmett teller)方法 ,对气凝胶的孔径等特性进行了测试 ,系统研究了密度、温度、气压、湿度及掺杂物等因素对材料导热性能的影响 .
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| 关 键 词： | 二氧化硅气凝胶 制备 表面修饰 热导率 |
| 文章编号： | 0253-374X(2004)08-1106-05 |
Preparation of Silica Aerogels and Study of Surface Modification and Thermal Conductivity |
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| SHEN Jun,WANG Guo-qing,WANG Jue,DENG Zhong-sheng. Preparation of Silica Aerogels and Study of Surface Modification and Thermal Conductivity[J]. Journal of Tongji University(Natural Science), 2004, 32(8): 1106-1110 |
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| Authors: | SHEN Jun WANG Guo-qing WANG Jue DENG Zhong-sheng |
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| Abstract: | Nano-porous SiO 2 aerogel insulations were prepared via sol-gel process from polyethoxydisiloxanes (E-40).The aerogels were dried at ambient pressure after surface modification of the alcogels.The pore size distribution of silica aerogels is from several nanometer to dozens of nanometer,which were determined by BET(brunaner-emmett-teller).The thermal conductivity measurement of the silica aerogels was determined using the transient hot-wire technique.The influence of density,temperature,pressure,humidity and doping to the thermal conductivity was studied. |
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| Keywords: | SiO 2 aerogel preparation surface modification thermal conductivity |
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