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Mechanical vibration, as an alternative of application of solid/liquid lubricants, has been an effective means to modulate friction at the macroscale. Recently, atomic force microscopy (AFM) experiments and model simulations also suggest a similar vibration-induced friction reduction effect for nanoscale contact interfaces, although an additional external vibration source is typically needed to excite the system. Here, by introducing a piezoelectric thin film along the contact interface, we demonstrate that friction measured by a conductive AFM probe can be significantly reduced (more than 70%) when an alternating current (AC) voltage is applied. Such real-time friction modulation is achieved owing to the localized nanoscale vibration originating from the intrinsic inverse piezoelectric effect, and is applicable for various material combinations. Assisted by analysis with the Prandtl–Tomlinson (P–T) friction model, our experimental results suggest that there exists an approximately linear correlation between the vibrational amplitude and the relative factor for perturbation of sliding energy corrugation. This work offers a viable strategy for realizing active friction modulation for small-scale interfaces without the need of additional vibration source or global excitation that may adversely impact device functionalities.


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Vibration-induced nanoscale friction modulation on piezoelectric materials

Show Author's information Jiawei CAO1Qunyang LI1,2( )
Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Abstract

Mechanical vibration, as an alternative of application of solid/liquid lubricants, has been an effective means to modulate friction at the macroscale. Recently, atomic force microscopy (AFM) experiments and model simulations also suggest a similar vibration-induced friction reduction effect for nanoscale contact interfaces, although an additional external vibration source is typically needed to excite the system. Here, by introducing a piezoelectric thin film along the contact interface, we demonstrate that friction measured by a conductive AFM probe can be significantly reduced (more than 70%) when an alternating current (AC) voltage is applied. Such real-time friction modulation is achieved owing to the localized nanoscale vibration originating from the intrinsic inverse piezoelectric effect, and is applicable for various material combinations. Assisted by analysis with the Prandtl–Tomlinson (P–T) friction model, our experimental results suggest that there exists an approximately linear correlation between the vibrational amplitude and the relative factor for perturbation of sliding energy corrugation. This work offers a viable strategy for realizing active friction modulation for small-scale interfaces without the need of additional vibration source or global excitation that may adversely impact device functionalities.

Keywords: piezoelectric materials, vibration, friction modulation, contact resonance, Prandtl–Tomlinson (P–T) model

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Publication history

Received: 26 April 2021
Revised: 23 June 2021
Accepted: 01 September 2021
Published: 14 January 2022
Issue date: October 2022

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© The author(s) 2021.

Acknowledgements

This work was funded by the National Natural Science Foundation of China (12025203, 11772169, 11921002, and 11890671), the National Science and Technology Major Project (2017-VI-0003-0073), and the Initiative Program of State Key Laboratory of Tribology (SKLT2019B02). The authors thank Dr. Kaiyue FANG and Prof. Fei FANG both from Tsinghua University for providing the PMN–PT sample.

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