Year: 2008
Type: article
Abstract: Energy dissipation due to friction in telescopic carbon nanotubes is modeled by molecular dynamics over a wide temperature range. The energy dissipation or the friction force between the inner and outer tubes is strongly related to thermal effects and shows a minimum as temperature increases. At ultra-low temperatures, thermal lubrication, i.e. the reduction in the friction force because of thermal activation, plays a dominant role because energy barriers for the relative translational movement of the concentric nanotubes are so small that the thermally activated jumps effectively reduce the friction force. However, as temperature increases, the thermal jump probability saturates and when the temperature reaches a critical value the dominant phonon frequency exceeds the vibration frequency of the oscillator and more phonons will be excited by the mechanical vibration, which leads to a monotonic increase of the friction force.
Source: Nanotechnology
Institutions: Southeast University, Vanderbilt University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, National Natural Science Foundation of China, Government of Jiangsu Province, Program for New Century Excellent Talents in University, National Key Research and Development Program of China, Division of Chemical, Bioengineering, Environmental, and Transport Systems
OpenAlex ID: W2080750366