| 干燥溶剂介质对常压制备SiO2气凝胶的影响 |
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| 引用本文： | 卢斌,周强,宋淼,魏琪青,黄欢. 干燥溶剂介质对常压制备SiO2气凝胶的影响[J]. 中南大学学报(自然科学版), 2012, 43(7): 2560-2565 |
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| 作者姓名： | 卢斌 周强 宋淼 魏琪青 黄欢 |
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| 作者单位： | 中南大学材料科学与工程学院,湖南长沙,410083 |
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| 基金项目： | 湖南省科技计划重点项目 |
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| 摘 要： | 以正硅酸乙酯和乙醇等为原料,通过溶胶-凝胶、表面修饰及溶剂置换等后续工艺,实现常压干燥法制备块状SiO2气凝胶,并考察干燥溶剂介质对气凝胶常压制备的影响。研究结果表明:采用混合溶剂干燥的SiO2气凝胶性能较单一溶剂更佳,以正己烷和甲苯混合溶剂制备的SiO2气凝胶性能最优,具有低表观密度(0.102 7 g/cm3)、高比表面积(928.4 m2/g)、大孔容(3.295 cm3/g)及疏水性良好等特性。
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| 关 键 词： | SiO2气凝胶 干燥介质 干燥机理 |
Influence of drying solvents on silica aerogels at ambient pressure |
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| LU Bin , ZHOU Qiang , SONG Miao , WEI Qi-qing , HUANG Huan. Influence of drying solvents on silica aerogels at ambient pressure[J]. Journal of Central South University:Science and Technology, 2012, 43(7): 2560-2565 |
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| Authors: | LU Bin ZHOU Qiang SONG Miao WEI Qi-qing HUANG Huan |
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| Affiliation: | (School of Materials Science and Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | SiO2 aerogel was prepared with TEOS and Ethanol as raw material by sol-gel method,surface modification,solvent exchange and ambient pressure drying.The results indicate that SiO2 aerogels dried in solvent mixtures have properties superior to aerogels dried in single solvent,SiO2 aerogel dried in solvent mixture(hexane and toluene) has best properties,low apparent density(0.102 7 g/cm3),high surface area(928.4 m2/g),high pore volume(3.295 cm3/g) and hydrophobic silica aerogel was obtained with solvent mixture(hexane and toluene). |
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| Keywords: | SiO2 aerogel drying solvent drying mechanism |
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