Friction Control by Applying Electric Potential under Lubrication with Ionic Liquids

Kawada, Shouhei; Ogawa, Seishi; Sasaki, Shinya; Miyatake, Masaaki

doi:10.2474/trol.14.71

Cited by 11 publications

(11 citation statements)

References 34 publications

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“…In the cases of [HMIM][BF 4 ] and [OMIM][BF 4 ] with longer alkyl chains, the friction coefficient of the applied surface potential increased compared to that of OCP. When no potential is applied, ionic liquids form the adsorption layer and have cations and anions aligned side by side on the worn surfaces [27,29,30]. It is considered that these adsorption layer exhibit the lowest friction.…”

Section: Potential Windows Of Ionic Liquidsmentioning

confidence: 99%

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Friction Manipulation of Ionic Liquids under Boundary Lubrication by Controlling the Surface Potential

Tanji,

Sato,

Kawada

et al. 2023

Tribology Online

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This study attempted to manipulate the friction coefficient of ionic liquids at contact pressures on the order of several hundred MPa (maximum Hertzian pressure) via the surface potential. Because the manipulation of the friction coefficient requires the adsorption and desorption of ionic liquids, the tests were conducted at potentials where electrolysis does not occur. The friction coefficients at negative potentials were different for the same cationic ionic liquid at a constant friction potential. This indicates that the ionic liquid was not a monolayer film but a multilayer film in which anions also exist. The friction coefficient was reduced by lengthening the cationic alkyl chains. These results suggest that the conductivity has a significant effect on the frictional response of ionic liquids. Moreover, the friction coefficient remained constant after the surface potential was removed. The adsorption layer at the surface potential was considered stable, and it was difficult to overcome the energy barrier to change the adsorption structure of the ionic liquids.

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Section: Potential Windows Of Ionic Liquidsmentioning

confidence: 99%

“…In pure rolling friction tests, the thickness of the boundary lubrication layer varied according to the surface potential [28]. It was observed that the friction coefficient varied with low contact pressure (the order of several hundred kPa) under sliding friction conditions [29].…”

Section: Introductionmentioning

confidence: 99%

Friction Manipulation of Ionic Liquids under Boundary Lubrication by Controlling the Surface Potential

Tanji,

Sato,

Kawada

et al. 2023

Tribology Online

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“…Due to their purely ionic composition, ILs interact strongly with surfaces, which lead to the formation of tribologically protective layers 45 . These interactions can be controlled by applying electrical potentials, which influences the tribological behaviour 46‐51 . Some wear additives such as ZDDP have synergetic effects with ILs 45 .…”

Section: Introductionmentioning

confidence: 99%

“…45 These interactions can be controlled by applying electrical potentials, which influences the tribological behaviour. [46][47][48][49][50][51] Some wear additives such as ZDDP have synergetic effects with ILs. 45 From an environmental point of view, the addition of graphene to ILs should also be investigated.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ionic liquids with and without graphene as lubricant additive for metal/metal and metal/PEEK contacts over a wide temperature range

Amann

Gatti

et al. 2020

Lubrication Science

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The aim of the work is to improve tribological properties of an ATF oil by means of additives. Two ionic liquids (IL) and one IL with 0.1 wt.% graphene were chosen as candidates. The ILs were selected because of their promising surface interactions and proven synergy with anti-wear additives. However, little is known about the addition of ILs to fully formulated lubricants, especially in the low temperature range. Therefore, static and sliding friction as well as wear were measured in an application-relevant temperature range of −30 to 100 C using a rotating ball-on-3-plate test. The best additive for ATF oil for material pairing 100Cr6/polyether ether ketone was 5 wt.% [P66614][TMPP] [G] (halogen-free) and for 100Cr6/sintered iron 3 wt.% [P66614][BTA]. The additives lead to a wear reduction of more than 50%. Furthermore, it could be observed that the selected ILs have different effects on the friction behaviour at the temperatures investigated.

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“…In recent years, new challenges have emerged regarding the use of ionic liquids as lubricants. For example, the control of the friction surface potential using these liquids as additives was investigated [27][28][29][30][31][32][33][34][35]. In addition, as a very important challenge, it is necessary to evaluate the effect of moisture on the friction properties of an ionic liquid.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids

2019

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The properties of ionic liquids make them an appealing choice for use as lubricant oil. However, the effect of moisture on the friction properties of ionic liquids needs to be elucidated. Moisture affects the disappearance and growth of the lubricating layer of these liquids. To express the high friction reduction effect, the lubricating layer formed by the ionic liquids at the friction interface plays a very important role. Thus, it is necessary to evaluate the relationship between these liquid structures and moisture, for the development of design guidelines for new ionic liquid structures that can achieve very low friction. This investigation evaluated the friction properties and the friction mechanisms of hydrophobic ionic liquids (1-butyl-3-methylimidazolium dicyanamide [BMIM][DCN] and 1-butyl-3methylimidazolium tetrafluoroborate [BMIM][BF 4 ]), and a hydrophilic ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF 6 ]) under various atmospheres (vacuum, dry air, and air) to better understand the effect of moisture on the friction properties. The hydrophilic ionic liquid exhibited differences in the friction properties depending on the atmosphere, while the hydrophobic ionic liquid remained unaffected by the atmosphere. The adsorption layer formed by [BMIM][DCN] was anion-rich, both ion-rich, and cationrich in vacuum, dry air, and air respectively. In air, [BMIM][BF 4 ] developed corrosive wear and the reaction layer formed by [BMIM][PF 6 ] increased with moisture.

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Friction Control by Applying Electric Potential under Lubrication with Ionic Liquids

Cited by 11 publications

References 34 publications

Friction Manipulation of Ionic Liquids under Boundary Lubrication by Controlling the Surface Potential

Friction Manipulation of Ionic Liquids under Boundary Lubrication by Controlling the Surface Potential

Investigation of ionic liquids with and without graphene as lubricant additive for metal/metal and metal/PEEK contacts over a wide temperature range

Effect of Surrounding Atmosphere on Friction Properties of Hydrophobic and Hydrophilic Ionic Liquids

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