A novel super-elastic carbon nanofiber with cup-stacked carbon nanocones and a screw dislocation
| Autor: | Han, Xu, Xu, Futian, Duan, Shuyong, Zhan, Haifei, Gu, Yuantong, Liu, Guirong |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Carbon, 2019, 154, 98-107 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.carbon.2019.07.084 |
| Popis: | 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. Comment: 10 pages, 10 figures |
| Databáze: | arXiv |
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