期刊
CARBOHYDRATE POLYMERS
卷 98, 期 1, 页码 282-289出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.05.082
关键词
SiO2; Cellulose aerogel; Composite aerogel; Heat insulation performance; Cold plasma modification
资金
- Important Science & Technology Specific Projects of Hainan Province [ZDZX20100009]
- Projects of Science Foundation of Hainan Province [512113]
- Young Scientist Project of Hainan University [Qnjj1235]
Cellulose-SiO2 composite hydrogel was prepared by combining the NaOH/thiourea/H2O solvent system and the immersion method with controlling the hydrolysis-fasculation rate of tetraethyl orthosilicate (TEOS). The hydrophobic composite aerogels were obtained through the freeze-drying technology and the cold plasma modification technology. Composite SiO2 could obviously reduce the thermal conductivity of cellulose aerogel. The thermal conductivity could be as low as 0.026 W/(mK). The thermal insulation mechanism of the aerogel material was discussed. Composite SiO2 reduced hydrophilicity of cellulose aerogel, but environmental humidity had a significant influence on heat insulation performance. After hydrophobic modification using CCl4 as plasma was conducted, the surface of composite aerogel was changed from hydrophilic to hydrophobic and water contact angle was as high as 132. The modified composite aerogel still kept good heat insulation performance. This work provided a foundation for the possibility of applying cellulose-SiO2 composite aerogel in the insulating material field. (C) 2013 Elsevier Ltd. All rights reserved.
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