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Research Article | Open Access

Low friction under ultrahigh contact pressure enabled by self-assembled fluorinated azobenzene layers

Dandan XUE1Zhi XU1Linyuan GUO1Wendi LUO2Liran MA1( )Yu TIAN1( )Ming MA1( )Qingdao ZENG2( )Ke DENG2Wenjing ZHANG1Yichun XIA1Shizhu WEN1Jianbin LUO1
State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
National Center for Nanoscience and Technology, Beijing 100190, China
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Abstract

Extensive efforts have been made to pursue a low-friction state with promising applications in many fields, such as mechanical and biomedical engineering. Among which, the load capacity of the low-friction state has been considered to be crucial for industrial applications. Here, we report a low friction under ultrahigh contact pressure by building a novel self-assembled fluorinated azobenzene layer on an atomically smooth highly-oriented pyrolytic graphite (HOPG) surface. Sliding friction coefficients could be as low as 0.0005 or even lower under a contact pressure of up to 4 GPa. It demonstrates that the low friction under ultrahigh contact pressure is attributed to molecular fluorination. The fluorination leads to effective and robust lubrication between the tip and the self-assembled layer and enhances tighter rigidity which can reduce the stress concentration in the substrate, which was verified by density functional theory (DFT) and molecular dynamics (MD) simulation. This work provides a new approach to avoid the failure of ultralow friction coefficient under relatively high contact pressure, which has promising potential application value in the future.

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Friction
Pages 1434-1448
Cite this article:
XUE D, XU Z, GUO L, et al. Low friction under ultrahigh contact pressure enabled by self-assembled fluorinated azobenzene layers. Friction, 2024, 12(7): 1434-1448. https://doi.org/10.1007/s40544-023-0782-2

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Received: 04 April 2023
Revised: 11 May 2023
Accepted: 19 May 2023
Published: 23 November 2023
© The author(s) 2023.

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