材料科学
消散
碳纳米管
声子
热的
振动
激发态
航程(航空)
分子动力学
热能
纳米核糖学
大气温度范围
润滑
机械
复合材料
凝聚态物理
热力学
摩擦学
原子物理学
物理
量子力学
作者
Yunfei Chen,Juekuan Yang,Xiaohui Wang,Ni Zhang,Deyu Li
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2008-12-17
卷期号:20 (3): 035704-035704
被引量:20
标识
DOI:10.1088/0957-4484/20/3/035704
摘要
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.
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