Plastic bending and shape-memory effect of double-wall carbon nanotubes
Plastic bending and shape-memory effect of double-wall carbon nanotubes
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DOI：
10.1103/physrevb.76.165405
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
H. Mori;S. Ogata;Ju Li;S. Akita;Y. Nakayama
中科院分区：
文献类型：
--
作者：
H. Mori;S. Ogata;Ju Li;S. Akita;Y. Nakayama
采用轻推弹性带最小能量路径方法分析了（5，5）@（10，10）双壁碳纳米管的塑性弯曲。在较低的应用弯曲曲率下，仅外管塑性变形。然而，在较高的弯曲曲率下，内管和外管都塑性变形。我们发现，由于管-管的相互作用，外管的塑性变形比相同直径的孤立单壁碳纳米管更困难。相反，内管的塑性变形不受外管的存在的强烈影响。我们还分析了实验发现的形状记忆效应（SME），这是一个从塑性弯曲状态到直的无缺陷状态的热恢复过程，可以重复多次。我们分析了碳纳米管形状记忆效应背后的物理机制，这与传统的形状记忆合金有很大的不同。
Plastic bending of (5,5)@(10,10) double-wall carbon nanotube is analyzed using nudged elastic band minimum energy path calculations. At lower applied bending curvature, only the outer tube deforms plastically. However, at higher bending curvature, both the inner and outer tubes deform plastically. We find that the plastic deformation of the outer tube is more difficult than that of isolated single-wall carbon nanotube of the same diameter due to tube-tube interactions. In contrast, the plastic deformation of the inner tube is not strongly affected by the presence of the outer tube. We also analyze the shape-memory effect (SME) discovered experimentally, which is a thermal recovery process from the plastically bent state to the straight defect-free state, which can be repeated multiple times. We analyze the physics behind SME of carbon nanotubes, which is quite different from that of traditional shape-memory alloys.