碳纳米管增强气凝胶隔热复合材料的性能研究  

Characterization of carbon nanotubes reinforced SiO_2 aerogels composites for thermal insulation

作　　者：吴会军[2] 彭程[1] 丁云飞[2] 周孝清[2] 

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广州大学广东省建筑节能与应用技术重点实验室,广东广州510006

出　　处：《广州大学学报（自然科学版）》2012年第6期32-37,共6页Journal of Guangzhou University:Natural Science Edition

基　　金：广东省自然科学基金项目(S2011010003429);广东省教育部产学研结合项目(2011B090400632);住房和城乡建设部研究开发项目(2011-K1-24);广州市"羊城学者"科研项目(10A038G)资助

摘　　要：以碳纳米管为增强相,通过溶胶-凝胶和常压干燥制备出碳纳米管增强SiO2气凝胶隔热复合材料,对复合材料的形貌和微观结构进行了表征,测试了材料的红外透射率、有效导热系数及抗压强度.研究结果表明加入碳纳米管后气凝胶平均孔径略有减小、红外辐射遮挡效率提高,使碳纳米管增强气凝胶复合材料具有超级绝热性能;而且碳纳米管明显改善了气凝胶的抗压强度,如加入1wt%碳纳米管后气凝胶在10%形变下的抗压强度提高了1.7倍.Carbon nanotubes （CNTs） reinforced SiO2 aerogel composites were successfully fabricated via sol-gel process and drying at atmosphere pressure. The morphologies and micro-structures of the as-fabricated aerogel composites were characterized. The infrared transmittance, the effective thermal conductivity and the press strength of the aerogel composites were also measured. The results showed that the mean pore diameters and the infrared transmittance of the aerogel composites were both decreased after the CNTs were added in the SiO2 aero- gels. Therefore, the CNTs reinforced aerogel composites had super-thermal insulation. Moreover, the addition of CNTs significantly improved the press strength of the SiO2 aerogels. For instance, the press strength at 10% deformation of the aerogel composites with the CNTs content of lwt% was improved 1.7 times than that of the pure SiO2 aerogels.

关 键 词：隔热材料 气凝胶 碳纳米管 导热系数 

分 类 号：TB303[一般工业技术—材料科学与工程]