二硫化钼层间依赖于共谱性的声波超润滑性

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-04-25 DOI:10.1007/s11249-024-01850-8
Yun Dong, Bo Shi, Yi Tao, Xinyi Tang, Jinguang Wang, Yifan Liu, Futian Yang
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引用次数: 0

摘要

本文解读了声波超润滑性对二硫化钼(MoS2)层间相对旋转引起的共相性的依赖性。结果表明,在共相态下,由于界面势能较强,滑动探针表现出明显的粘滑现象;探针和基底的振动频率耦合,构建了有效的能量传递通道。随着旋转角度的增大,粘滑相位和探针固有振荡由于界面势的减小而耦合。一旦接触状态达到完全不相容,探针就只会发生固有振荡。更重要的是,我们进一步发现,电位周期是由晶格周期决定的,这导致激发声子的频率分布在旋转角度变化时保持不变。此外,随着旋转角度的增大,摩擦界面附近的原子对摩擦能量耗散的贡献也越来越大。这些发现揭示了 MoS2 层间随角度变化的超润滑性的声子机制,并为摩擦调节提供了一种可行的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Commensurability-Dependent Phononic Superlubricity Between Molybdenum Disulfide Layers

This paper decodes the dependence of phononic superlubricity on commensurability caused by relative rotation between molybdenum disulfide (MoS2) layers. Results show that under commensurate state, due to the strong interfacial potential, the sliding probe exhibits obvious stick–slip phenomenon; the vibration frequencies of the probe and the substrate are coupled, constructing effective energy transfer channels. As the rotation angle increases, the stick–slip phase and probe inherent oscillation are coupled owing to the decreasing interfacial potential. Once the contacting state reaches to completely incommensurability, the probe only undergoes inherent oscillation. More importantly, we further find that the potential period is determined by the lattice period, which causes the frequency distribution of the excited phonons to remain unchanged although changes in rotation angle. In addition, the contribution of atoms adjacent to friction interface to frictional energy dissipation becomes more significant with the rotation angle increasing. These findings reveal the phononic mechanism of angle-dependent superlubricity between MoS2 layers and provide a viable approach for friction regulation.

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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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