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Research Article | Open Access

Macroscopic superlubricity of potassium hydroxide solution achieved by incorporating in-situ released graphene from friction pairs

Hongyu LIANG1, Xinjie CHEN1, Yongfeng BU2( ), Meijuan XU1, Gang ZHENG1,3, Kaixiong GAO4, Xijun HUA1, Yonghong FU1, Junyan ZHANG4
Institute of Advanced Manufacturing and Modern Equipment Technology, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
ZhenJiang SiLian Mechatronic Technology Co., Ltd., Zhenjiang 212009, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Graphical Abstract

Abstract

Graphene (G), as a typical two-dimensional material, is often used as an additive for liquid lubricants. However, graphene is mostly added to liquid lubricants in a one-time manner in friction; it mainly exists in the form of multilayer agglomerated structures due to the π–π stacking between graphene sheets, making it unable to fully exert the synergistic lubrication function. Herein, we propose a new macroscopic superlubric system of graphene/potassium hydroxide (G/KOH) solution; and the graphene additive involved is exfoliated in-situ from graphene/epoxy (G/EP) friction pair by friction, continuously providing freshly-peeled graphene into KOH solution and minimizing the adverse effects of graphene agglomeration. Moreover, the in-situ produced graphene additive has thinner thickness and better anti-aggregation ability, which provide more graphene to accommodate OH−, form more stacked sandwich structures of OH−/graphene/OH− between friction pairs (i.e., equivalent to a moving pulley block with more wheels), and finally realize superlubricity. This study develops a new liquid superlubric system suitable for alkaline environments, and at the same time proposes a new way to gradually release graphene additives in situ, rather than adding them all at once, deepening the understanding to liquid superlubricity mechanism, and paving the experimental foundation for the practical application of macroscopic superlubricity.

Keywords

liquid superlubricityconcentrated potassium hydroxide (KOH) solutionin-situ graphene (G) additivesstacked sandwich structureelectric double layer (EDL)hydrogen bonds (H-bonds)

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Friction
Volume 11 Issue 4,
April 2023
Pages 567-579
DOI: 10.1007/s40544-022-0620-y
Cite this article:
LIANG H, CHEN X, BU Y, et al. Macroscopic superlubricity of potassium hydroxide solution achieved by incorporating in-situ released graphene from friction pairs. Friction, 2023, 11(4): 567-579. https://doi.org/10.1007/s40544-022-0620-y

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Received: 17 August 2021
Revised: 05 November 2021
Accepted: 08 March 2022
Published: 04 July 2022
© The author(s) 2022.

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