Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

Yang, Xiaoyong; Meng, Yonggang; Tian, Yu

doi:10.1007/s11249-014-0394-0

Cited by 44 publications

(41 citation statements)

References 23 publications

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“…The experimental results verify the coincident changes in the friction coefficient and the desorption amount of the SDS film, the mechanism of which is consistent with that found in the aqueous SDS solution. When the SDS surfactant was replaced with ionic liquids (ILs), 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIm]BF 4 ), 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIm]PF 6 ), and 1-decyl-3-methylimidazolium hexafluorophosphate ([DMIm]PF 6 ), a similar effect of the potential on boundary lubrication was found [129], suggesting that the adsorption of ions contributes greatly to boundary lubrication of the IL additives, and that the boundary lubricating ability can be improved to the utmost by applying a proper electrical potential to the steel surface. This mechanism even applies to pure IL as lubricant, with different types of adsorbed ion on the friction pair at different surface potentials [130].…”

Section: Potential Controlled Boundary Lubrication In Non-aqueous Solmentioning

confidence: 93%

“…Yang et al [129] choose the SDS surfactant in a pure propylene carbonate based fluid as a model lubricant to investigate the effect of potential on friction. Propylene carbonate is a polar aprotic solvent and is frequently used as a high permittivity component of electrolytes in lithium batteries.…”

Section: Potential Controlled Boundary Lubrication In Non-aqueous Solmentioning

confidence: 99%

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Boundary lubrication by adsorption film

2015

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A complete understanding of the mechanism of boundary lubrication is a goal that scientists have been striving to achieve over the past century. Although this complicated process has been far from fully revealed, a general picture and its influencing factors have been elucidated, not only at the macroscopic scale but also at the nanoscale, which is sufficiently clear to provide effective instructions for a lubrication design in engineering and even to efficiently control the boundary lubrication properties. Herein, we provide a review on the main advances, especially the breakthroughs in uncovering the mysterious but useful process of boundary lubrication by adsorption film. Despite the existence of an enormous amount of knowledge, albeit unsystematic, acquired in this area, in the present review, an effort was made to clarify the mainline of leading perspectives and methodologies in revealing the fundamental problems inherent to boundary lubrication. The main content of this review includes the formation of boundary film, the effects of boundary film on the adhesion and friction of rough surfaces, the behavior of adsorption film in boundary lubrication, boundary lubrication at the nanoscale, and the active control of boundary lubrication, generally sequenced based on the real history of our understanding of this process over the past century, incorporated by related modern concepts and prospects.

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Section: Potential Controlled Boundary Lubrication In Non-aqueous Solmentioning

confidence: 93%

Section: Potential Controlled Boundary Lubrication In Non-aqueous Solmentioning

confidence: 99%

Boundary lubrication by adsorption film

2015

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“…Since some ionic liquids are soluble in base oils they may also act as supporting electrolytes in lubricants. Yang, Meng, and Tian have studied the effect of electrode potentials on Pt with solutions of imidazoline-based ionic liquid in propylene carbonate using cyclic voltammetry [98,99]. They found that the solutions gave low friction at negative potentials and high friction at positive potentials that they ascribed to the adsorption of the cation and anion species, respectively.…”

Section: Recent Research On Triboelectrochemistrymentioning

confidence: 99%

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Spikes

2020

Tribol Lett

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Research on the effects of applied electrical potential on friction and wear, a topic sometimes termed “Triboelectrochemistry”, has been reviewed. Historically, most such research has focussed on aqueous lubricants, whose relatively high electrical conductivities enable use of three-electrode electrochemical kinetic techniques, in which the electrode potential at a single electrode | fluid interface is controlled relative to a suitable reference electrode. This has led to identification of several different mechanisms by which applied electrode potentials can influence friction and wear. Of these, the most practically important are: (i) promotion of adsorption/desorption of polar additives on tribological surfaces by controlling the latters’ surface charges; (ii) stimulation or suppression of redox reactions involving either oxygen or lubricant additives at tribological surfaces. In recent years, there has been growing interest in the effects of applied electrical potentials on rubbing contacts lubricated by non-aqueous lubricants, such as ester- and hydrocarbon-based oils. Two different approaches have been used to study this. In one, a DC potential difference in the mV to V range is applied directly across a thin film, lubricated contact to form a pair of electrode | fluid interfaces. This has been found to promote some additive reactions and to influence friction and wear. However, little systematic exploration has been reported of the underlying processes and generally the electrode potentials at the interfaces have not been well defined. The second approach is to increase the conductivity of non-aqueous lubricants by adding secondary electrolytes and/or using micro/nanoscale electrodes, to enable the use of three-electrode electrochemical methods at single metal | fluid interfaces, with reference and counter electrodes. A recent development has been the introduction of ionic liquids as both base fluids and lubricant additives. These have relatively high electrical conductivities, allowing control of applied electrode potentials of individual metal | fluid interfaces, again with reference and counter electrodes. The broadening use of “green”, aqueous-based lubricants also enlarges the possible future scope of applied electrode potentials in tribology. From research to date, there would appear to be considerable opportunities for using applied electrical potentials both to promote desirable and to supress unwanted lubricant interactions with rubbing surfaces, thereby improving the tribological performance of lubricated machine components. Graphical Abstract

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“…In addition, it is necessary to be aware that the sliding material does not cause electric corrosion. Yang et al used steel as sliding materials [28]. It is possible that the electric corrosion of steel will become.…”

Section: Introductionmentioning

confidence: 99%

Friction Control by Applying Electric Potential under Lubrication with Ionic Liquids

et al. 2019

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This study investigated the effects of the electric potential of a surface on the lubricating capabilities of ionic liquids. The friction coefficient of 1-butyl-3-methylimidazolium iodide was unchanged by the electric potential of the surface because this ionic liquid has difficulty moving in a solution owing to its low conductivity. However, the friction coefficient, when lubricated with 1-butyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate and 1-butyl-3-methylimidazolium hexafluorophosphate, changed when the electric potential of the surface was varied. At-2.0 V, cations were adsorbed on the sliding surface. The alkyl chain of cations supported the load and achieved a low friction coefficient. However, at 2.0 V, anions were adsorbed on the sliding surface. Such ions cannot support the load, and thus reach a high friction coefficient.

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Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

Cited by 44 publications

References 23 publications

Boundary lubrication by adsorption film

Boundary lubrication by adsorption film

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Friction Control by Applying Electric Potential under Lubrication with Ionic Liquids

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