The pH-dependent structural and tribological behaviour of aqueous graphene oxide suspensions

He, Anshun; Huang, Shuiquan; Yun, Jung‐Ho; Jiang, Zhengyi; Stokes, Jason R.; Jiao, Sihai; Wang, Luyao; Huang, Han

doi:10.1016/j.triboint.2017.08.008

Cited by 51 publications

(31 citation statements)

References 31 publications

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“…Finally, the group proposed that the chemical chain of GO can be modified to increase its lubricating properties as a water lubricant additive. He et al [ 128 ] also investigated the effect of pH on the tribological properties of GO suspensions. Compared with pure water, an acidic GO suspension reduced the friction coefficient by 44.4% and the wear radius by 17.1%.…”

Section: Field Of Water Lubricationmentioning

confidence: 99%

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

Liu

Zhou

Xiao³

et al. 2018

Materials

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Two-dimensional (2D) materials are ultra-thin crystals with layered structures that have a monolayer and multiple layers of atomic thickness. Due to excellent performance, 2D materials represented by graphene have caused great interest from researchers in various fields, such as nano-electronics, sensors, solar cells, composite materials, and so on. In recent years, when graphite was used for liquid phase lubrication, there have been many disadvantages limiting its lubrication properties, such as stable dispersion, fluidity and so on. Therefore, 2D materials have been used as high-performance liquid-phase lubricant additives, which become a perfect entry point for high-performance nano-lubricants and lubrication applications. This review describes the application of 2D materials as additives in the field of liquid-phase lubrication (such as lubricating oil and water lubrication) in terms of experimental content, lubrication performance, and lubrication mechanism. Finally, the challenges and prospects of 2D materials in the lubrication field were also proposed.

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Section: Field Of Water Lubricationmentioning

confidence: 99%

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

Liu

Zhou

Xiao³

et al. 2018

Materials

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“…Kinoshita et al have studied that the lubricant can provide a very low friction coefficient of 0.05 with no noticeable surface wear by adding GO in water 19 . Moreover, recent researches have suggested that the changes in pH have a significant influence on carboxyl groups of GO although they hold different opinions 20–23 . Besides, the pristine GO lubricant shows acidic, which is detrimental to the quality of the strip surface, whereas the alkaline lubricant during the strip cold rolling is better.…”

Section: Introductionmentioning

confidence: 99%

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

Meng

Sun

Wang

et al. 2020

Surface & Interface Analysis

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The tribological performance and lubrication mechanism of graphene oxide (GO) aqueous lubricants with different pH levels on the strip surfaces during cold rolling were investigated. And triethanolamine (TEA) was used to adjust the pH levels of GO lubricants. The morphology of GO and physical characterization of GO lubricants were carried out. Four‐ball tribological tests and cold rolling experiments were conducted to obtain the tribological behaviors of GO lubricants on the strip surfaces. To figure out the lubrication mechanism, the surfaces of the rolled strips using GO lubricants were analyzed utilizing a series of experiments. The increase in the pH value of lubricants changed the intrinsic structure of GO, resulting in better dispersibility and wettability. The change of physical characteristics significantly improved the antifriction and antiwear properties of lubricants, and the alkaline lubricant (pH 9.0) exhibited the best lubrication performance. A diameter–height ratio (λd) applied by a calculation method was proposed to approximatively ascertain the lubrication regime during the cold rolling. The λd and the surface quality of the rolled strips indicated that the lubrication regime was the boundary lubrication when using the alkaline lubricant. Moreover, GO particles in the alkaline lubricant could repair the strip surface by mending effect and form the physically adsorbed layers. The layers prevented direct contact between rolled surfaces, further amending the surface quality of the rolled strips.

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“…10 The lubrication efficiency of graphene materials depends on its composition, 11 graphene layer number, 12 morphology, 13 and experimental conditions. 14,15 For example, multilayer graphene films impair adhesion and friction. 16 This film has a coefficient of friction comparable to that of bulk graphite.…”

Section: Introductionmentioning

confidence: 99%

Effect of different preparation processes on tribological properties of graphene

Liu

Dong

Zhang

et al. 2020

Nanomaterials and Nanotechnology

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Two processes of physical liquid phase stripping and chemical redox reduction were used to obtain graphene sheets. Fourier transform infrared spectroscopy and Raman spectroscopy test methods were used to compare and analyze the structure and disorder of graphene. The obtained graphene was modified with oleic acid and stearic acid. The dispersion stability of graphene as a lubricating oil additive was investigated by natural sedimentation method and spectrophotometry. The tribological properties of the graphene dispersion were investigated by a four-ball friction and wear tester. Scanning electron microscope and energy spectrometer were used to characterize and analyze the microscopic morphology and composition of the worn surface. The results showed that the modified liquid phase stripping graphene demonstrated the best anti-wear and anti-friction properties of the dispersion, the lowest friction coefficient is 0.0677, and the average friction coefficient is reduced by about 26%.

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The pH-dependent structural and tribological behaviour of aqueous graphene oxide suspensions

Cited by 51 publications

References 31 publications

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

Research Progress in Application of 2D Materials in Liquid-Phase Lubrication System

pH‐dependent lubrication mechanism of graphene oxide aqueous lubricants on the strip surface during cold rolling

Effect of different preparation processes on tribological properties of graphene

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