Effect of strain on the interlayer friction behavior of double-walled carbon nanotubes with abnormal interlayer distances
In order to reveal the friction mechanism of low-dimensional nanomaterials,and effectively regulate the friction process,the interlayer friction of coaxial double-walled carbon nanotubes(DWNTs)with different interlayer distances under axial tension was studied by molecular dynamics simulations.The simulation results show that the friction behavior of the abnormal DWNTs is quite different from that of a normal DWNT(interlayer distances d=0.34 nm).The interlayer friction force of the abnormal DWNTs(d<0.34 nm)could be reduced by increasing the tensional strain,but the friction force changes between the layers of the normal DWNT are relatively small.It is found that the interlayer van der Waals interaction of the abnormal DWNTs decreases gradually with increasing the strain,which leads to an ob-vious decrease in the interlayer resistance and the interlayer friction force.The research indicates that the interlayer frictional behavior of abnormal DWNTs can be effectively regulated by strain engineering.The results are of great significance for further understanding the frictional behavior of low-dimensional nano-materials.
nanoscale frictioncarbon nanotubeabnormal interlayer distancesstrainmanipula-tion of friction
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