Dong Yun, Ding Yusong, Rui Zhiyuan, Lian Fangming, Hui Weibin, Wu Jie, Wu Zhiguo, Yan Pengxun
Institute of Nanomaterials Application Technology, Gansu Academy of Sciences, Lanzhou, 730000, People's Republic of China.
School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou, 730050, People's Republic of China.
Nanotechnology. 2022 Mar 15;33(23). doi: 10.1088/1361-6528/ac56ba.
Controlling friction force and thermal conductance at solid/solid interface is of great importance but remains a significant challenge. In this work, we propose a method to control the matching degree of phonon spectra at the interface through modifying the atomic mass of contact materials, thereby regulating the interfacial friction force and thermal conductance. Results of Debye theory and molecular dynamics simulations show that the cutoff frequency of phonon spectrum decreases with increasing atomic mass. Thus, two contact surfaces with equal atomic mass have same vibrational characteristics, so that more phonons could pass through the interface. In these regards, the coupling strength of phonon modes on contact surfaces makes it possible to gain insight into the nonmonotonic variation of interfacial friction force and thermal conductance. Our investigations suggest that the overlap of phonon modes increases energy scattering channels and therefore phonon transmission at the interface, and finally, an enhanced energy dissipation in friction and heat transfer ability at interface.
控制固体/固体界面的摩擦力和热导率非常重要，但仍然是一项重大挑战。在这项工作中，我们提出了一种通过改变接触材料的原子质量来控制界面声子谱匹配程度的方法，从而调节界面摩擦力和热导率。德拜理论和分子动力学模拟结果表明，声子谱的截止频率随原子质量的增加而降低。因此，具有相同原子质量的两个接触表面具有相同的振动特性，从而更多的声子可以通过界面。在这些方面，接触表面上声子模式的耦合强度使得深入了解界面摩擦力和热导率的非单调变化成为可能。我们的研究表明，声子模式的重叠增加了能量散射通道，从而增加了界面处的声子传输，最终增强了界面处摩擦和热传递能力中的能量耗散。
