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首页> 外文期刊>Journal of Applied Physics >Buckling of double-walled carbon nanotubes under compression and bending: Influence of vacancy defects and effect of high-temperature annealing
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Buckling of double-walled carbon nanotubes under compression and bending: Influence of vacancy defects and effect of high-temperature annealing

机译：压缩和弯曲作用下双壁碳纳米管的屈曲：空位缺陷的影响和高温退火的影响

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摘要

We study by molecular dynamics simulations the effect of vacancy defects on mechanical properties of double-walled carbon nanotubes (DWCNTs) under compression and bending. Our results show that the critical buckling strain under compression and critical buckling angle under bending generally decrease with increasing defect density, but the detailed buckling behavior is sensitive to defect distribution patterns (e.g., whether vacancies are on the inner or outer wall, at separate sites or clustered together). Interestingly, upon high-temperature annealing, vacancy defects undergo structural reconstructions and, in particular, form interlayer bonds that significantly improve the load carrying capability of the DWCNTs under compressive and bending deformation. These results provide new insights into the role of vacancy defects in determining the buckling behavior of multi-walled carbon nanotubes (MWCNTs); they also suggest that high-temperature annealing is an effective tool for defect engineering to improve mechanical properties of MWCNTs. The present study reveals trends and underlying mechanisms with regard to the buckling of DWCNTs under different loading conditions, and the obtained results may provide a useful guide for post-synthesis treatment and application of MWCNTs.
机译：我们通过分子动力学模拟研究空位缺陷对压缩和弯曲条件下双壁碳纳米管（DWCNTs）力学性能的影响。我们的结果表明，压缩下的临界屈曲应变和弯曲下的临界屈曲角通常随着缺陷密度的增加而减小，但是详细的屈曲行为对缺陷的分布模式（例如，空位是在内壁还是外壁上的不同部位）敏感。或聚集在一起）。有趣的是，在高温退火后，空位缺陷会进行结构重建，尤其是形成层间键，从而显着提高DWCNT在压缩和弯曲变形下的承载能力。这些结果为空位缺陷在确定多壁碳纳米管（MWCNT）的屈曲行为中的作用提供了新的见解；他们还认为，高温退火是缺陷工程中提高MWCNTs力学性能的有效工具。本研究揭示了在不同载荷条件下DWCNT屈曲的趋势和潜在机理，所得结果可为MWCNTs的后合成处理和应用提供有用的指导。

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  • 来源
    《Journal of Applied Physics》 |2013年第17期|174308.1-174308.6|共6页
  • 作者

    William Wolfs; Chun Tang; Changfeng Chen;

  • 作者单位

    Department of Physics and Astronomy and High Pressure Science and Engineering Center,University of Nevada, Las Vegas, Nevada 89154, USA;

    Department of Physics and Astronomy and High Pressure Science and Engineering Center,University of Nevada, Las Vegas, Nevada 89154, USA,School of Engineering, University of California, Merced, California 95343, USA;

    Department of Physics and Astronomy and High Pressure Science and Engineering Center,University of Nevada, Las Vegas, Nevada 89154, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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