Department of Mechanical Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul, South Korea.
Nanoscale. 2012 Jul 7;4(13):3937-44. doi: 10.1039/c2nr30691c. Epub 2012 May 24.
Surface morphology is one of the critical parameters that affect the frictional behavior of two contacting bodies in relative motion. It is important because the real contact area as well as the contact stiffness is dictated by the micro- and nano-scale geometry of the surface. In this regard, the frictional behavior may be controlled by varying the surface morphology through nano-structuring. In this study, molecular dynamics simulations were conducted to investigate the effects of contact area and structural stiffness of corrugated nano-structures on the fundamental frictional behavior at the atomic-scale. The nano-structured surface was modeled as an array of corrugated carbon atoms with a given periodicity. It was found that the friction coefficient of the nano-structured surface was lower than that of a smooth surface under specific contact conditions. The effect of applied load on the friction coefficient was dependent on the size of the corrugation. Furthermore, stiffness of the nano-structure was identified to be an important variable in dictating the frictional behavior.
表面形貌是影响两个相对运动的接触体摩擦行为的关键参数之一。这很重要，因为实际接触面积以及接触刚度是由表面的微观和纳米尺度几何形状决定的。在这方面，可以通过纳米结构化来改变表面形貌来控制摩擦行为。在这项研究中，进行了分子动力学模拟，以研究波纹纳米结构的接触面积和结构刚度对原子尺度基本摩擦行为的影响。纳米结构化表面被建模为具有给定周期性的波纹碳原子阵列。结果发现，在特定的接触条件下，纳米结构化表面的摩擦系数低于光滑表面的摩擦系数。外加负载对摩擦系数的影响取决于波纹的大小。此外，纳米结构的刚度被确定为决定摩擦行为的重要变量。
