Auxetic materials with large negative Poisson's ratios based on highly oriented carbon nanotube structures

被引:56
作者
Chen, Luzhuo [1 ,2 ]
Liu, Changhong [1 ,2 ]
Wang, Jiaping [1 ,2 ]
Zhang, Wei [3 ,4 ]
Hu, Chunhua [1 ,2 ]
Fan, Shoushan [1 ,2 ]
机构
[1] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Beijing 100084, Peoples R China
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
基金
中国国家自然科学基金;
关键词
carbon nanotubes; nanocomposites; Poisson ratio; polymers; DESIGN; FABRICATION; BUCKYPAPER; SHEETS; ARRAYS; YARNS; FOAM;
D O I
10.1063/1.3159467
中图分类号
O59 [应用物理学];
学科分类号
摘要
Auxetic materials with large negative Poisson's ratios are fabricated by highly oriented carbon nanotube structures. The Poisson's ratio can be obtained down to -0.50. Furthermore, negative Poisson's ratios can be maintained in the carbon nanotube/polymer composites when the nanotubes are embedded, while the composites show much better mechanical properties including larger strain-to-failure (similar to 22%) compared to the pristine nanotube thin film (similar to 3%). A theoretical model is developed to predict the Poisson's ratios. It indicates that the large negative Poisson's ratios are caused by the realignment of curved nanotubes during stretching and the theoretical predictions agree well with the experimental results.
引用
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页数:3
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