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arXiv 1111.2505cond-mat.mes-hall
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碳纳米管壁相对滑动的障碍可以测量吗?

Can Barrier to Relative Sliding of Carbon Nanotube Walls Be Measured?

Andrey M. Popov, Yurii E. Lozovik, Evgenii K. Krivorotov

摘要:

壁间相互作用能,以及沿纳米管轴的壁的相对滑动的障碍,首先计算对两个扶手椅或两个锯齿形相邻的碳纳米管壁具有广泛的半径范围。结果表明,对于外壁半径大于5nm的原子对,壁间相互作用能和每个原子相对滑动的势垒都与壁半径有很小的关系.由这些障碍确定的可测量的物理量的一个广泛的集合被估计为壁半径的函数:剪切强度和扩散系数的壁沿轴的相对滑动,以及壁的相对轴向振荡的频率。对于壁的不可逆伸缩延伸,估计阈值静摩擦力大于毛细力的壁的最大重叠。通过测量估算的物理量对计算的势垒进行实验验证的可能性进行了讨论。

英文摘要:

Interwall interaction energies, as well as barriers to relative sliding of the walls along the nanotube axis, are first calculated for pairs of both armchair or both zigzag adjacent walls of carbon nanotubes with a wide range of radiuses. It is found that for the pairs with the radius of the outer wall greater than 5 nm both the interwall interaction energy and barriers to the relative sliding per one atom of the outer wall only slightly depends on the wall radius. A wide set of the measurable physical quantities determined by these barriers are estimated as a function of the wall radius: shear strengths and diffusion coefficients for relative sliding of the walls along the axis, as well as frequencies of relative axial oscillations of the walls. For nonreversible telescopic extension of the walls, maximum overlap of the walls for which threshold static friction forces are greater than capillary forces is estimated. Possibility of experimental verification of the calculated barriers by measurements of the estimated physical quantities is discussed.

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