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首页> 外文会议>International Symposium on Eco-Materials Processing amp; Design; 20060108-11; Chengdu(CN) >Solvents Effects on Physicochemical Properties of Nano-porous Silica Aerogels Prepared by Ambient Pressure Drying Method
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Solvents Effects on Physicochemical Properties of Nano-porous Silica Aerogels Prepared by Ambient Pressure Drying Method

机译：溶剂对常压干燥法制备纳米多孔二氧化硅气凝胶理化性质的影响

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摘要

Hydrophobic silica aerogels were synthesized by an ambient pressure drying method from silicic acid with a different pH value, which was prepared from sodium silicate solution (water glass). In this study we chose various hydrocarbon class solvents such as pentane, hexane, heptane, and toluene, and performed surface modification in TMCS (trimethylchlorosilane)/solvent solutions in order to improve reproducibility in aerogel production. Densities of the aerogels were about 0.1 ～ 0.3 g/cm~3 , and apparent porosities were 88 ～ 96 %, depending on the processing conditions. Specific surface area was approximately 730 ～ 950 m~2/g, and average pore size around 10 nm.
机译：疏水性二氧化硅气凝胶是通过环境压力干燥法，由不同pH值的硅酸合成而成的，而硅酸是由硅酸钠溶液（水玻璃）制得的。在这项研究中，我们选择了各种烃类溶剂，例如戊烷，己烷，庚烷和甲苯，并在TMCS（三甲基氯硅烷）/溶剂溶液中进行了表面改性，以提高气凝胶生产中的重现性。气凝胶的密度约为0.1〜0.3 g / cm〜3，视加工条件而定，表观孔隙率为88〜96％。比表面积约为730〜950m〜2 / g，平均孔径约为10nm。

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