文献类型：期刊文献

英文题名：Convenient and rapid preparation of aerogels dried at ambient pressure

作者：Han, Yuqing[1];Wu, Youqing[1];Huang, Sheng[1,2];Zhang, Hong[3];Liang, Zijun[1];Guan, Xuebo[3];Wu, Shiyong[1,2]

机构：[1]East China Univ Sci & Technol, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon containing W, Minist Educ, Shanghai 200237, Peoples R China;[3]Naicher New Mat Yingkou Co Ltd, Yingkou 115004, Peoples R China

年份：2023

卷号：622

外文期刊名：JOURNAL OF NON-CRYSTALLINE SOLIDS

收录：;EI(收录号：20234014830781);WOS:【SCI-EXPANDED(收录号:WOS:001088735300001)】；

基金：This work was supported by the key technologies program of the Yingkou Science and Technology Bureau [Item No. 2022JH3/0200003] .

语种：英文

外文关键词：Atmospheric pressure drying; Aerogel; Hydrophobic modification; Porous structure; Skeleton strength

摘要：Dimethyldiethoxysilane (DDS) was introduced as a coprecursor to hydrophobically modify aerogels during the sol-gel stage. By adjusting the content of alkali catalyst (dilute ammonia), the skeletal structure was coarsened, leading to the successful preparation of aerogels with excellent three-dimensional network structures via ambient pressure drying. The DDS/SiO2 aerogel formed with a dilute ammonia content of 15 ml exhibited remarkable properties, including the lowest density (0.102 g/cm(3)), highest porosity (95.3 %), and lowest thermal conductivity (0.03203 W center dot m(-1)center dot K-1). This simplified method greatly reduces the intricate steps involved in the conventional ambient pressure drying process for the preparation of silica aerogels. The fastest preparation process in this study lasted only 15 h, providing an efficient and cost-effective approach for producing aerogels. Furthermore, the DDS/SiO2 aerogel demonstrated superhydrophobicity with a contact angle exceeding 150 degrees Due to this characteristic, the prepared DDS/SiO2 aerogel is highly suitable for use in harsh and humid environments.