The Dependency of Friction on Temperature and Sliding Velocity in Low Dimensional Systems with Different Atom Electronegativity

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Jie Gao, Jianjun Wang, Chong Qiao, Yu Jia, Bo N. J. Persson
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Abstract

Using the molecular dynamics simulations we study sliding friction of two-dimensional systems with atom electronegative difference. We show that systems with large atom electronegative difference exhibit larger friction than systems with similar structures but less polarity. We demonstrate that the sliding friction along polar paths gives larger friction than along nonpolar paths, and exhibits stronger stick–slip behavior. Due to inertia and thermal effects the sliding path deviates from the minimum-energy path. We show that the electronegative friction is reduced by thermal fluctuations and that it depends linearly on the logarithm of the sliding velocity. Our findings will supply insight into the nature of the friction in low dimensional systems, which could facilitate the design of nanodevices.

Abstract Image

不同原子电负性低维体系中摩擦力对温度和滑动速度的依赖性
我们利用分子动力学模拟研究了具有原子电负性差异的二维系统的滑动摩擦力。我们发现,原子电负性差异较大的体系比结构相似但极性较小的体系表现出更大的摩擦力。我们证明,沿极性路径的滑动摩擦比沿非极性路径的滑动摩擦大,并表现出更强的粘滑行为。由于惯性和热效应,滑动路径偏离了最小能量路径。我们的研究表明,电负摩擦力会因热量波动而减小,并与滑动速度的对数成线性关系。我们的研究结果将有助于深入了解低维系统中摩擦的性质,从而促进纳米器件的设计。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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