We present the characteristics of the sliding friction in large-diameter collapsed carbon nanotubes (CNTs) as emerged from molecular dynamics simulations. The friction force is found to depend strongly on the CNT sliding velocity, the interface contact area, interface commensuration, and temperature. The non-classical smooth sliding and superlubric behaviors identified at the molecular level give a useful starting reference to the ongoing efforts aimed at engineering the mechanical load transfer in material systems comprising collapsed CNTs.
Bibliographical noteFunding Information:
We acknowledge useful discussions with G. Odegard and O. Hod. This work was supported by NASA's Space Technology Research Grant NNX16AE03G and by the Institute for Ultra-Strong Composites by Computational Design , Grant NNX17AJ32G . Resources supporting this work were provided by the NASA High End Computing Program through the NASA Advanced Supercomputing Division at Ames Research Center .
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