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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >A novel super-elastic carbon nanofiber with cup-stacked carbon nanocones and a screw dislocation
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A novel super-elastic carbon nanofiber with cup-stacked carbon nanocones and a screw dislocation

机译：一种新型超弹性碳纳米纤维，带杯堆叠碳纳米型和螺丝脱位

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摘要

Carbon nanofibers (NFs) have been envisioned with broad promising applications, such as nanoscale actuators and energy storage medium. This work reports for the first-time super-elastic tensile characteristics of NFs constructed from a screw dislocation of carbon nanocones (NF-S). The NF-S exhibits three distinct elastic deformation stages under tensile, including an initial homogeneous deformation, delamination, and further stretch of covalent bonds. The delamination process endows the NF-S extraordinary tensile deformation capability, which is not accessible from its counterpart with a normal cup-stacked geometry. The failure of NF-S is governed by the inner edges of the nanocone due to the strain concentration, leading to a common failure force for NF-S with varying geometrical parameters. Strikingly, the delamination process is dominated by the inner radius and the apex angle of the nanocone. For a fixed apex angle, the yielding strain increases remarkably when the inner radius increases, which can exceed 1000%. It is also found that the screw dislocation allows the nanocones flattening and sliding during compression. This study provides a comprehensive understanding on the mechanical properties of NFs as constructed from carbon nanocones, which opens new avenues for novel applications, such as nanoscale actuators. (C) 2019 Elsevier Ltd. All rights reserved.
机译：已经设想了碳纳米纤维（NFS），其具有广泛的承诺应用，例如纳米级执行器和能量存储介质。这项工作报告了由碳纳米碳通（NF-S）构成的NFS的第一次超弹性拉伸特性。 NF-S在拉伸下具有三个不同的弹性变形阶段，包括初始均匀的变形，分层和进一步拉伸共价键。分层过程赋予了NF-S非凡的拉伸变形能力，该变形能力不可从其对应于正常的杯堆叠几何形状。 NF-S的故障由纳米碘的内边缘引起的，由于应变浓度，导致NF-S具有不同几何参数的常见失效力。尖锐的是，分层过程由纳米碘的内半径和顶角为主。对于固定的顶角，当内半径增加时，屈服应变显着增加，这可以超过1000％。还发现螺旋位错允许纳米纳米在压缩期间扁平化和滑动。本研究提供了碳纳米能源所构成的NFS的机械性能的全面了解，其为新颖的应用，例如纳米级执行器开放新的途径。 （c）2019年elestvier有限公司保留所有权利。

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