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    Facile synthesis of flexible and hydrophobic polymethylsilsesquioxane based silica aerogel via the co-precursor method and ambient pressure drying technique

    Year: 2020

    Journal: J. Non-Cryst. Solids, Volume 530, FEB 15

    Authors: Wu Xiaodong; Kai, Zhong; Jie, Ding; Shen Xiaodong; Sheng, Cui; Ya, Zhong; Ma Jiaying; Chen Xiangbao

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51702156, 51602148]; General Program of Natural Science Fund in Colleges and Universities of Jiangsu Province [19KJB430023]; Science and technology innovation project for overseas of Nanjing City; Postdoctoral Science Foundation of Jiangsu ProvinceChina Postdoctoral Science Foundation [2019K005]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2019M661781]; Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites

    Keywords: Silica aerogel; Hydrophobic; Flexible; Ambient pressure drying

    The fragility, hydrophilicity and high cost fabrication of aerogels have limited their applications in industrial and civilian fields. Herein, we have described a method for preparing a novel flexible and hydrophobic silica aerogel by using the co-precursors method via ambient pressure drying technique. The optimal MTMS volume percentage is determined at 60%. The resulting aerogel obtains agglomerated particles with diameters at similar to 20-30 nm and mesopores at several tens of nanometers. The Si-C-H bond ratio maintains at 13. 36% after heat treatment at 300 degrees C, which results in the high water contact angle of 153.9 degrees. Moreover, the 300 degrees C heat treated aerogel has a much more homogeneous microstructure with its BET specific surface area as large as 895.5 m(2)/g. The oxidation peak of -CH3 groups is observed at 492 degrees C. The aerogel exhibits an excellent flexibility under 50 compression cycles, as well as a superior thermal insulation property.
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