Double-layer transfer film enabled by graphene oxide-assembled hydrophobic ionic liquids for low friction under high humidity

IF 6.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Friction Pub Date : 2025-06-23 DOI:10.26599/frict.2025.9441135

Haijie Chen, Zihao Zhang, Zhiwen Zheng, Jingjing Zhang, Dan Qiao, Chao Zhang

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Abstract

Achieving outstanding friction reduction and wear resistance on engineering steel by utilizing graphene oxide (GO) based films has attracted growing interest, when given its easy shear, modification and availability. However, maintaining excellent friction performance under high relative humidity (RH) over a long duration is a major challenge for GO film. Therefore, we report that a double-layers transfer film enabled by the unique lubrication mechanism which based on GO interface assembly composite hydrophobic ionic liquids (ILs) triggers excellent tribological property under high humidity. Moreover, the film (SS-GO-ILs) showed excellent tribological properties in the air (average friction coefficient of 0.24, wear volume of 2.54×10^-7 mm³) and 85%RH (average friction coefficient of 0.28, wear volume of 2.33×10^-7 mm³), and the wear volume is reduced to one-thousandth of the SS-GO film. At 85%RH, MD simulation results demonstrated that the interaction between GO and ILs was weakened under the action of water molecules. The unique lubrication mechanism was enabled by the double-layers transfer film formed on the steel balls, along with tribo-chemical reaction and hydrolysis that create an adaptable easy-shear interface.

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由氧化石墨烯组装的疏水离子液体实现的双层转移膜在高湿条件下的低摩擦

利用氧化石墨烯（GO）薄膜在工程钢上实现卓越的摩擦减少和耐磨性，由于其易于剪切、改性和可用性，引起了人们越来越多的兴趣。然而，在高相对湿度（RH）下长时间保持优异的摩擦性能是氧化石墨烯薄膜面临的主要挑战。因此，我们报道了一种基于氧化石墨烯界面组装复合疏水离子液体（ILs）的独特润滑机制的双层转移膜在高湿条件下具有优异的摩擦学性能。此外，该膜（SS-GO- ils）在空气中（平均摩擦系数0.24，磨损体积2.54×10-7 mm3）和85%RH（平均摩擦系数0.28，磨损体积2.33×10-7 mm3）表现出优异的摩擦学性能，磨损体积减小到SS-GO膜的千分之一。在85%的相对湿度下，MD模拟结果表明，在水分子的作用下，氧化石墨烯和氧化石墨烯之间的相互作用减弱。独特的润滑机制是通过在钢球上形成的双层传递膜，以及摩擦化学反应和水解，形成一个适应性强的易剪切界面。

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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来源期刊

Friction Engineering-Mechanical Engineering

CiteScore

12.90

自引率

13.20%

发文量

324

审稿时长

13 weeks

期刊介绍： Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.