期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 622, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2023.122665
关键词
Atmospheric pressure drying; Aerogel; Hydrophobic modification; Porous structure; Skeleton strength
By adjusting the alkali catalyst content, the hydrophobically modified silica aerogels using Dimethyldiethoxysilane (DDS) exhibit excellent structure and performance, making them suitable for harsh and humid environments.
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.
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