单壁碳纳米管中稳态机械波的激发条件研究

Study on Excitation Condition of Stabilized Mechanical Waves in Single-walled Carbon Nanotubes

通过分子动力学模拟,对单壁碳纳米管中稳态机械波的激发条件进行了详细的研究。利用所施加的周期性机械外力,使单壁碳纳米管产生局部径向形变,该形变将以单壁碳纳米管的管壁为弹性媒质传播开去,从而在单壁碳纳米管中形成机械波;机械波产生的条件依赖于单壁碳纳米管波动系统能量的维持和受迫振动区域形变方向的控制;稳定机械波形成的最佳条件是碳纳米管的形变度和受迫振动频率之间的最优匹配,以及由此形成的单壁碳纳米管在周期性外力作用下产生的共振。

The excitation condition of the stabilized mechanical waves in single-walled carbon nanotubes（SWNT） were investigated by molecular dynamics simulation.Using external periodic forces,local forced oscillation was made in SWNT.With the propagating of the deformation induced by oscillation,the mechanical waves were formed in SWNT.The results of the simulations indicated that the generation of the mechanical waves is dependant on the supply of the energy for fluctuating system and the control of the direction of local forced deformation in SWNT.In order to generate steady mechanical waves in a SWNT,there is always a mandatory correlation condition between the frequency and the magnitude of forced oscillation.It is found that the waving system is resonated by the external periodic forces under the mandatory correlation condition.