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由于层间距和手性的耦合影响,非公度双壁碳纳米管的层间摩擦行为比较复杂,其规律至今仍不清楚.论文采用分子动力学模拟方法,研究了非公度双壁碳纳米管的层间摩擦特性.总体来说,层间距较小或层间手性角差较小时,层间摩擦力较大.当层间手性角差在10°以上时,层间接触接近非公度接触,层间摩擦力几乎不受层间手性影响;此时在层间平衡位置附近(0.34±0.02nm),层间摩擦力与层间距之间近似呈线性关系.无论层间手性如何匹配,边界原子所受摩擦力总是大于内部原子所受摩擦力,显示边界效应是纳尺度摩擦中的一个普遍现象.
Due to the influence of the layer spacing and the chiral coupling, the interfacial friction behavior of the noncommensable double-walled carbon nanotubes is quite complicated and the law is still unclear.According to the molecular dynamics simulations, In general, when the interlayer spacing is small or the chromaticity difference between layers is small, the friction between layers is larger.When the chiral angle difference between layers is more than 10 °, the contact between layers is close to non-contact In the meantime, there is a linear relationship between the friction between the layers and the layer spacing between the interlayer equilibrium positions (0.34 ± 0.02nm) How to match the nature of the boundary atom friction is always greater than the internal friction suffered by the atom, showing that the boundary effect is a common phenomenon in the nano-scale friction.