Tribological Characteristics of Imidazolium-based Room Temperature Ionic Liquids Under High Vacuum

Suzuki, Akihito; Shinka, Yoshihiro; Masuko, Masabumi

doi:10.1007/s11249-007-9235-8

Cited by 115 publications

(95 citation statements)

References 31 publications

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“…Lubricating oils are typically optimized through additive technology and the development of new additives suitable for use with MACs is important in improving their tribological properties. During the last decade, ionic liquids (ILs) have been rapidly developed as new types of lubricant or lubricant additives due to their excellent tribological performance and unique physicochemical properties, which satisfy the requirements of high-performance lubricants [6][7][8][9]. The structures of commonly used IL lubricants or additives are based on bulky asymmetrical cations such as ammonium, phosphonium, pyridinium and imidazolium cations.…”

Section: Introductionmentioning

confidence: 99%

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

et al. 2013

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Two lithium-based ionic liquids (ILs, L-C3N3, and L-P3N3) were synthesized and evaluated as novel lubricant additives for multiply alkylated cyclopentanes (MACs). They were found to be approximately 1.0% soluble in MACs at room temperature (RT), whereas traditional ILs, such as 1-ethyl-3-methylimidazolium tetrafluoroborate (L-B102), 1-hexyl-3-methylimidazolium hexafluorophosphate (L-P106), and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (L-F102), could not be dissolved in this base oil. Friction tests indicated that these ILs exhibit excellent friction-reducing and anti-wear properties both at RT and at 100 °C . They can improve the tribological properties of MACs at RT to a greater extent than the commonly used lubricant zinc dialkyldithiophosphate (T204), even at a concentration of 0.1%. The load ramp test showed that MACs with L-C3N3 and L-P3N3 also exhibit high load-carrying capabilities. Scanning electron microscope (SEM) and X-ray photoelectron spectrometer (XPS) results indicated that physical adsorption and complex tribochemical reactions occurred between the ILs and metal surfaces during the sliding process, thereby forming a surface protective film that significantly contributed to the excellent tribological properties of the new ILs.

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Section: Introductionmentioning

confidence: 99%

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

et al. 2013

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“…They have been used as novel highperformance lubricants, because of their attractive properties, such as low vapor pressure, low volatility, high thermal stability, and high oxidation stability [4][5][6][7]. Most of the studies on ionic liquids as lubricants focus on fluorine-based ionic liquids, such as tetrafluoroborate, hexafluorophosphate, trifluoromethanesulfonate, and tris(perfluoroalkyl) trifluorophosphate [8][9][10][11][12][13][14][15][16][17]. Zinc dialkyldithiophosphate (ZDDP) is a well-known lubricant additive and exhibites good tribological properties [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Zinc dialkyldithiophosphate (ZDDP) is a well-known lubricant additive and exhibites good tribological properties [18][19][20][21][22]. Fluorine-based ionic liquids exhibit superior tribological properties than ZDDP, because of the formation of tribo-films composed of FeF 2 and FeF 3 during sliding [8][9][10][11][12][13][14][15][16][17]23]. However, use of fluorine-based ionic liquids as a lubricant results in corrosion of metallic materials due to the formation of hydrogen fluoride [8,24].…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Cyano-Based Ionic Liquids under Different Environments

Kawada

Sasaki

2018

Tribology Online

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Ionic liquids have been used as novel high-performance lubricants. However, fluorine-based ionic liquids cause corrosion of materials by the formation of FeF 2 and FeF 3 . This study focuses on cyano-based ionic liquids, as they have low corrosion tendencies owing to the absence of fluorine in their structures. However, cyano-based ionic liquids are hydrophilic, and hence, the effect of ambient conditions (e.g., atmospheric moisture) on the tribological properties needs to be investigated. This study reports the tribological properties of two types of cyano-based ionic liquids 1-ethyl-3-methylimidazolium dicyanamide and 1-ethyl-3-methylimidazolium tricyanomethane under air, vacuum, and dry air environments. Their friction coefficients were found to be dependent on the ambient condition. Both the ionic liquids exhibited low friction coefficients in vacuum. The time-of-flight secondary ion mass spectrometry results indicated that the anion was adsorbed on the worn surface under vacuum conditions, and the adsorbed anion exhibited a low friction. In dry air, the cation was adsorbed on the worn surface, and the adsorbed cation exhibited a higher friction coefficient than the adsorbed anion. In air, the cyano-based ionic liquids caused corrosion of the sliding material and exhibited a high friction coefficient, because of the absorption of moisture from air.

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“…Features such as a negligible vapor pressure and a remarkable thermal stability [1][2][3][4] promise future applications as solvents for syntheses, electrolytes in fuel cells, solar cells, and batteries, as well as in biomass processing [5][6][7][8][9][10]. Moreover, due to the tiny vapor pressure many applications are conceivable under ultrahigh vacuum [1,3,11,12]. However, the technological use of RTILs requires an in-depth understanding of ionic systems.…”

Section: Introductionmentioning

confidence: 99%

Thermal and structural properties of ionic fluids

2015

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The electrostatic interaction in ionic fluids is well-known to give rise to a characteristic phase behavior and structure. Sometimes its long range is proposed to single out the electrostatic potential over other interactions with shorter ranges. Here the importance of the range for the phase behavior and the structure of ionic fluids is investigated by means of grandcanonical Monte Carlo simulations of the lattice restricted primitive model (LRPM). The long-ranged electrostatic interaction is compared to various types of short-ranged potentials obtained by sharp and/or smooth cut-off schemes. Sharply cut off electrostatic potentials are found to lead to a strong dependence of the phase behavior and the structure on the cut-off radius. However, when combined with a suitable additional smooth cut-off, the short-ranged LRPM is found to exhibit quantitatively the same phase behavior and structure as the conventional long-ranged LRPM. Moreover, the Stillinger-Lovett perfect screening property, which is well-known to be generated by the long-ranged electrostatic potential, is also fulfilled by short-ranged LRPMs with smooth cut-offs. By showing that the characteristic phase behavior and structure of ionic fluids can also be found in systems with short-ranged potentials, one can conclude that the decisive property of the electrostatic potential in ionic fluids is not the long range but rather the valency dependence.

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Tribological Characteristics of Imidazolium-based Room Temperature Ionic Liquids Under High Vacuum

Cited by 115 publications

References 31 publications

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

Tribological Properties of Cyano-Based Ionic Liquids under Different Environments

Thermal and structural properties of ionic fluids

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