期刊
MATERIALS & DESIGN
卷 113, 期 -, 页码 246-253出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.09.083
关键词
Silica aerogels; MTMS/Water-glass; Freeze drying; Hydrophobic; Thermal stability
资金
- Anhui Programs for Science and Technology Development [1604a0902175]
- Fundamental Research Funds for the Central Universities [WK2320000032]
In this paper, hybrid silica aerogels were prepared by methltrimethoxysilane (MTMS) and water-glass co-precursor through two-step sol-gel process followed by freeze drying (FD). The characteristics of aerogels were strongly affected by the molar ratio of MTMS/Water-glass. When the molar ratio is 5.1, hybrid aerogel was obtained with good performances, such as low density (0.083 g/cm(3)), high contact angle (155.1 degrees) and low thermal conductivity (0.0226 W/m.K). The density, contact angle and thermal conductivity of aerogels based on co-precursor are still showing excellent thermal stability with the same performances after 550 degrees C heat-treatment. (C) 2016 Published by Elsevier Ltd.
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