期刊
JOURNAL OF MATERIALS SCIENCE
卷 49, 期 22, 页码 7715-7722出版社
SPRINGER
DOI: 10.1007/s10853-014-8480-0
关键词
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资金
- Natural Science Foundation of China [51175444]
- Fundamental Research Funds for the Central Universities (Xiamen University) [2011121002]
- Aviation Science Foundation of China [2013ZD68009]
- New Century Excellent Talents in Fujian Province University
- Natural Science Foundation of Fujian Province of China [2014J01206]
- Xiamen Municipal Bureau of Science and Technology [3502Z20143009]
- Shenzhen City Science and Technology Innovation Committee [JCYJ20120618155425009]
We report the synthesis of flexible, hydrophobic, and oleophilic silica aerogels through a two-step acid-base sol-gel reaction followed by supercritical drying, in which methyltriethoxysilane (MTES) is used as a precursor, ethanol (EtOH) as a solvent, and hydrochloric acid (HCl) and ammonia (NH3 center dot H2O) as catalysts. At the optimal molar ratio of MTES:EtOH:H2O:HCl:NH3 center dot H2O is 1:18:3.5:1.44 x 10(-4):1.2, MTES-based silica aerogels show the minimum density of 0.046 g/cm(3) and the maximum compression ratio of 80 % with 15.09 kPa stress. They are superhydrophobic with a water contact angle of 157A degrees and thermally stable up to 350 A degrees C. We also find that they show the excellent adsorption for ethanol with a ratio of 1400 %.
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