Abstract
Carbon fibres have attracted interest from both the scientific and engineering communities due to their outstanding physical properties. Here we report that recently synthesized ultrathin diamond nanothread not only possesses excellent torsional deformation capability, but also excellent interfacial load-transfer efficiency. Compared with (10,10) carbon nanotube bundles, the flattening of nanotubes is not observed in diamond nanothread bundles, which leads to a high-torsional elastic limit that is almost three times higher. Pull-out tests reveal that the diamond nanothread bundle has an interface transfer load of more than twice that of the carbon nanotube bundle, corresponding to an order of magnitude higher in terms of the interfacial shear strength. Such high load-transfer efficiency is attributed to the strong mechanical interlocking effect at the interface. These intriguing features suggest that diamond nanothread could be an excellent candidate for constructing next-generation carbon fibres.
Highlights
Carbon fibres have attracted interest from both the scientific and engineering communities due to their outstanding physical properties
Times smaller compared to that of the diamond nanothread (DNT) bundle. These results indicate that the ultrathin DNT has very excellent torsional deformation capability compared to the abundant (10,10) Carbon nanotube (CNT)
For (10,10) CNT, the external diameter is adopted, which is the summation of the CNT diameter (13.56 Å) and the graphite interlayer distance (3.35 Å). These estimations signify that the DNT exhibits much better load-transfer efficiency than that of (10,10) CNT in the bundle structure
Summary
Carbon fibres have attracted interest from both the scientific and engineering communities due to their outstanding physical properties. Pull-out tests reveal that the diamond nanothread bundle has an interface transfer load of more than twice that of the carbon nanotube bundle, corresponding to an order of magnitude higher in terms of the interfacial shear strength. Such high load-transfer efficiency is attributed to the strong mechanical interlocking effect at the interface. Our following work revealed that the brittleness of DNTs can be changed via controlling the density of the SW transformation defects[18] With these excellent mechanical properties, ultrathin dimensions and a non-smooth surface (compared to CNT), it is of interest to determine how DNTs may be used in fibre applications. Do they possess excellent torsional deformation capability, they possess excellent interfacial load-transfer efficiency
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