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Carbon nanotubes are nano-objects with quite anisotropic properties, forexample the mechanical properties in longitudinal and radial directions differsignificantly. This feature of the carbon nanotubes yields many interestingphenomena investigated in last decades. One of them is the ability to form bothhollow and collapsed states if the radius of the nanotube is large enough. Thetransitions between the two states have been also reported. In our study wepresent single-walled carbon nanotube interacting with a plane substrate andcharacterize the energy of interaction with the substrate using effectiveLennard-Jones-type potential. We show energy of the homogeneous open andcollapsed states depending on the radius of the carbon nanotube and report onthe bi-stability in some range of the nanotube diameters. Using themolecular-dynamical simulations we look at the evolution of the initialhalf-opened, half-collapsed state and demonstrate that the transition area fromone state to another is spatially localized having features of topologicalsoliton (kink or anti-kink). We show that the value and the direction of thekink propagation speed depend significantly on the nanotube diameter as well ason the temperature of the system. We also discuss the mechanism of the processusing a simplified model with asymmetric double-well potential and show theentropic nature of the transition.

Temperature-induced reversal effects of kink dynamics in carbon nanotube on flat substrate