Superlubricity and Antiwear Properties of In Situ-Formed Ionic Liquids at Ceramic Interfaces Induced by Tribochemical Reactions

Ge, Xiangyu; Li, Jinjin; Zhang, Chenhui; Liu, Yuhong; Luo, Jianbin

doi:10.1021/acsami.8b21059

Cited by 86 publications

(39 citation statements)

References 49 publications

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“…Amann et al [93] also reported the use of ILs as anti-wear additives. Li et al [94] synthesized several ILs in situ with monovalent metal salts and ethylene glycol (EG) by tribochemical reactions and realized macroscale superlubricity for all ILs at silicon nitride (Si 3 N 4 ) interfaces. The combination of composite tribochemical layer (comprised of phosphates, fluorides, silica (SiO 2 ), and ammonia-containing compounds), hydration layer, and fluid film contributed to the superlubricity and wear protection, as shown in Fig.…”

Section: Molecular Lubrication 2311 Ionic Liquid Lubricationmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Section: Molecular Lubrication 2311 Ionic Liquid Lubricationmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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“…As for superlubricity achieved with ionic liquids, the wear resistance can be greatly improved, and accordingly, excellent extreme pressure is obtained. Notably, a tribochemical reaction occurs during the sliding process in which the anions in ionic liquids such as PF  6 , BF  4 , and NTf  2 react with water to produce phosphates [85], borides [86], and sulfides [87] on the worn surface, respectively [36,88]. Owing to the excellent extreme pressure and anti-wear properties of phosphates, the tribochemical layer formed by PF  6 exhibits the best lubricating performance [89].…”

Section: Discussionmentioning

confidence: 99%

“…It was found that the superlubricity state was closely related to the concentration of polyhydroxy alcohol and its number of hydroxyl groups contained [2629]. Moreover, it was recently reported that ionic liquids (ILs, e.g., the combination of cations of Li + , Na + , or K + , anions of PF 6  , BF 4  , or monovalent metal cation with a small size was beneficial in improving the wear condition [34][35][36]. At present, various superlubricity systems achieved by different lubricants after a period of running-in show great potential for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Superlubricity achieved with two-dimensional nano-additives to liquid lubricants

Wang

Liu

2020

Friction

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The topic of superlubricity is attracting considerable interest around the world while humanity is facing an energy crisis. Since various liquid superlubricity systems can be commonly achieved on the macroscale in ambient conditions, it is considered an effective solution to reduce unnecessary energy and material losses. However, certain practical problems such as low load-bearing pressure, dependence on hydrogen ions, and relatively long running-in processes still limit its widespread application. Twodimensional (2D) nano-additives with ultrathin longitudinal dimensions can lower the shear resistance between sliding solid surfaces, and thus further optimize the applied conditions. In this review, the latest studies on 2D nano-additives with a combination of various water-based lubricants in the state of superlubricity are reported, typically including black phosphorus (BP), graphene oxide (GO), and layered double hydroxide. During the sliding process, composite lubricants effectively improved the load capacity (up to 600 MPa), reduced wear, and accelerated the running-in period (within 1,000 s) of the liquid superlubricity system. Both macromechanical experiments and microscopic tests are conducted to precisely analyze various interactions at the interfaces of the nano-additives and solid surfaces. These interactions can be described as tribochemical reactions, physical protection, and adsorption enhancement, and improved wear resistance. This review provides better guidance for applying 2D nanomaterials in liquid superlubricity systems.

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“…The former could be controlled through viscosity manipulation, while the latter can be minimized by the adsorption of molecular layers of lubricant molecules. Recently, hydration lubrication has emerged as a promising strategy to macroscale liquid superlubricity, where water molecules are kept by charges surrounding ions or polar molecules, which still maintains exibility like liquids and remains integrity under pressure [18][19][20][21][22][23]. Furthermore, both water and polar molecules could attach to the steel surface to minimize the interfacial bonding.…”

Section: Introductionmentioning

confidence: 99%

Achieving Macroscale Liquid Superlubricity Using Lubricant Mixtures of Glycerol and Diols

Wang

Dong

2021

Preprint

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Friction and wear are ubiquitous in moving mechanical systems, and achieving vanishing friction and wear could significantly improve energy efficiency and extend the service life of mechanical components. In this paper, various diols, viz. ethylene glycol (EG), 1,3-propanediol (13-PD), and 1,2-propdiol (12-PD), have been selected to be mixed with glycerol for superlubricity performance. The results show that the lubricant mixture of EG and glycerol (EG/glycerol) and the mixture of 13-PD and glycerol (13-PD/glycerol) are effective in providing superlow friction (COF < 0.01) for steel tribopairs under ambient atmosphere environment with little surface damage caused. However, 12-PD, which exhibits the same chemical formula as 13-PD except for the configuration of hydroxyl groups, is ineffective for superlubrication. Furthermore, compared with 13-PD, EG is more efficient in preparing superlubric lubricants. Experimental and molecular dynamics simulation results show that the superlow friction realized by the lubricant mixtures of glycerol and diols is related to their intermolecular hydrogen-bonding interaction and the adsorbed formation of adsorbed molecular layers. The intermolecular interaction could affect the rheological property of lubricant mixtures and the hydrodynamic lubricant film-forming capability at the interface, while the quality of the adsorbed molecular layers determines the passivating efficiency for asperity interactions between opposite surfaces. Due to the atomic structure difference, EG is the most desirable diol for this objective, followed by 13-PD, while 12-PD is ineffective. These findings could help enable the rational design of novel lubricants for superlubricating performance and push the development of liquid superlubricity for future engineering applications.

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Superlubricity and Antiwear Properties of In Situ-Formed Ionic Liquids at Ceramic Interfaces Induced by Tribochemical Reactions

Cited by 86 publications

References 49 publications

A review of recent advances in tribology

A review of recent advances in tribology

Superlubricity achieved with two-dimensional nano-additives to liquid lubricants

Achieving Macroscale Liquid Superlubricity Using Lubricant Mixtures of Glycerol and Diols

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