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首页> 外文期刊>Chemphyschem: A European journal of chemical physics and physical chemistry >Unconventional Behavior of Friction at the Nanoscale beyond Amontons' Law
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Unconventional Behavior of Friction at the Nanoscale beyond Amontons' Law

机译：Amontons Law超越Amontons Law的南方级摩擦的非常规行为

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摘要

By means of a many-body van der Waals (vdW)-corrected density functional theory approach, the atomic-scale friction of a prototypical tip-substrate system consisting of an Si tip and a graphene substrate is studied. In a loading-sliding process, the tip-substrate distance is found to be essential for nanofrictional behavior, through determining the competition between vdW contributions and electronic contributions. As the tip approaches the substrate, this competition results in a smooth transition of normal forces from attraction to repulsion, and the friction coefficient in turn undergoes a sign change from negative to positive with possible giant magnitude and strong anisotropy. The loading-sliding process does not introduce any chemical modification of the underlying system. These findings reveal the boundary of validity of Amontons' law, unify negative and giant friction coefficients, rationalize the experimentally observed anisotropy of nanofriction, and are universal when vdW interactions are crucial, all of which are helpful to establish a comprehensive picture of nanofriction.
机译：通过许多身体范德瓦尔斯（VDW）校正的密度泛函理论方法，研究了由Si尖端和石墨烯基板组成的原型尖端基板系统的原子尺度摩擦。在装载滑动过程中，发现尖端基板距离是必不可少的纳米型行为，通过确定VDW贡献和电子贡献之间的竞争。当尖端接近基板时，该竞争导致了从吸引到排斥的正常力的平滑过渡，并且摩擦系数又经历了从负面变化到阳性，以可能的巨大幅度和强烈的各向异性。装载滑动过程不会引入底层系统的任何化学改性。这些发现揭示了Amontons法律的有效性，统一性和巨型摩擦系数的界限，合理化了实验观察到的纳米级各向异性，并且当VDW相互作用至关重要时，所有这些都是有助于建立纳米型综合了解纳米型局面。

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