Halide-Free Synthesis and Tribological Performance of Oil-Miscible Ammonium and Phosphonium-Based Ionic Liquids

All the moving components in an internal combustion engine require a lubricant that allows smooth sliding and/or rolling of interacting surfaces. Lubricant not only minimizes the friction and wear but also dissipates the heat generated due to friction and removes debris from the area of contact. Environmental concerns, decreasing mineral oil reserves and difficult disposal of nonbiodegradable conventional lubricants have urged the researchers to shift towards environmental-friendly lubricants. Number of tribological studies carried out in the past have proved that ionic liquid-based bio-lubricants are sustainable and biodegradable alternative to mineral oils. This paper presents a brief review of properties of ionic liquids and their ability to reduce friction and wear between the interacting surfaces. Tribological performance and compatibility of ionic liquids with various base-oils have been compared under boundary lubrication. The results reveal that phosphonium-based ionic liquids namely tetra-decyl tri-hexyl phosphonium bis(2,4,4-trimethylpentyl) phosphinate (P66614)i(C8)2PO2 and tri-hexyl tetra-decyl phosphonium bis(2-ethylhexyl) phosphate (P-DEHP) are more suitable for tribological applications. Since, ionic liquids can be tailored according to the application and millions of combinations are possible therefore, there is a need to summarize the published data in a more systematic and logical way.

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Tribological Performance of Cyano-Based Ionic Liquids as Functional Fluid

Surfactants in Tribology ◽

10.1201/9780429287701-1 ◽

2019 ◽

pp. 3-15

Author(s):

Shouhei Kawada ◽

Seiya Watanabe ◽

Yuki Hirata ◽

Chiharu Tadokoro ◽

Ryo Tsuboi ◽

...

Keyword(s):

Ionic Liquids ◽

Tribological Performance

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Experimental investigation on the effect of ionic liquids (C16H36BrP and C16H36BrN) on the tribological performance of neem oil

International Journal of Surface Science and Engineering ◽

10.1504/ijsurfse.2020.105877 ◽

2020 ◽

Vol 14 (1) ◽

pp. 16

Author(s):

R. Panneer ◽

T. Panneerselvam

Keyword(s):

Experimental Investigation ◽

Ionic Liquids ◽

Tribological Performance ◽

Neem Oil

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Tribological Performance Evaluation of Task-Specific Ionic Liquids Derived from Amino Acids

Industrial & Engineering Chemistry Research ◽

10.1021/ie402141v ◽

2013 ◽

Vol 52 (45) ◽

pp. 15829-15837 ◽

Cited By ~ 27

Author(s):

Praveen K. Khatri ◽

Gananath D. Thakre ◽

Suman L. Jain

Keyword(s):

Amino Acids ◽

Performance Evaluation ◽

Ionic Liquids ◽

Tribological Performance

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Investigation of the tribological performance of ionic liquids in non-conformal EHL contacts under electric field activation

Friction ◽

10.1007/s40544-019-0342-y ◽

2020 ◽

Vol 8 (5) ◽

pp. 982-994

Author(s):

Michal Michalec ◽

Petr Svoboda ◽

Ivan Krupka ◽

Martin Hartl ◽

Aleksandar Vencl

Keyword(s):

Ionic Liquids ◽

Electric Field ◽

Tribological Performance

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Ionic Liquid Crystals in Tribology

Lubricants ◽

10.3390/lubricants7090072 ◽

2019 ◽

Vol 7 (9) ◽

pp. 72 ◽

Cited By ~ 9

Author(s):

M.D. Avilés ◽

C. Sánchez ◽

R. Pamies ◽

J. Sanes ◽

M.D. Bermúdez

Keyword(s):

Molecular Structure ◽

Ionic Liquid ◽

Ionic Liquids ◽

Liquid Crystals ◽

Tribological Performance ◽

Wear Rates ◽

Fatty Acid Derivatives ◽

Potential Applications ◽

Ionic Liquid Crystals ◽

Definition Of

The present work intends to provide a brief account of the most recent advances in the use of ionic liquid crystals (ILCs) in the field of tribology, that is, the development of new lubricants with the ability to reduce the coefficients of friction and the wear rates of materials under sliding conditions. After a definition of ILCs and their relationship with neutral liquid crystals (LCs) and ionic liquids (ILs), the review will be focused on the influence of molecular structure and composition on the tribological performance, the combination with base oils, surfactants or water, and the different sliding configuration and potential applications. The main mechanisms proposed in order to justify the lubricating ability of ILCs will be analyzed. Special emphasis will be made for recent results obtained for fatty acid derivatives due to their renewable and environmentally friendly nature.

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Tribological Performance of Halogen-Free Ionic Liquids as Lubricants of Hard Coatings and Ceramics

Tribology Letters ◽

10.1007/s11249-013-0159-1 ◽

2013 ◽

Vol 51 (2) ◽

pp. 243-249 ◽

Cited By ~ 37

Author(s):

Yuriko Kondo ◽

Takahiro Koyama ◽

Ryo Tsuboi ◽

Miki Nakano ◽

Koji Miyake ◽

...

Keyword(s):

Ionic Liquids ◽

Tribological Performance ◽

Hard Coatings ◽

Halogen Free

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Tribological Behavior of Si3N4/Ti3SiC2Contacts Lubricated by Lithium-Based Ionic Liquids

Advances in Materials Science and Engineering ◽

10.1155/2014/863230 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Haizhong Wang ◽

Zenghong Song ◽

Dan Qiao ◽

Dapeng Feng ◽

Jinjun Lu

Keyword(s):

Ionic Liquids ◽

Elevated Temperature ◽

Tribological Properties ◽

Friction And Wear ◽

Room Temperature ◽

Tribological Behavior ◽

Tribological Performance ◽

Experimental Conditions ◽

Thermal Stabilities ◽

Protective Films

The tribological performance of Si3N4ball sliding against Ti3SiC2disc lubricated by lithium-based ionic liquids (ILs) was investigated using an Optimol SRV-IV oscillating reciprocating friction and wear tester at room temperature (RT) and elevated temperature (100°C). Glycerol and the conventional imidazolium-based IL 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (L-F106) were used as references under the same experimental conditions. The results show that the lithium-based ILs had higher thermal stabilities than glycerol and lower costs associated with IL preparation than L-F106. The tribotest results show that the lithium-based ILs were effective in reducing the friction and wear of Si3N4/Ti3SiC2contacts. [Li(urea)]TFSI even produced better tribological properties than glycerol and L-F106 both at RT and 100°C. The SEM/EDS and XPS results reveal that the excellent tribological endurance of Si3N4/Ti3SiC2contacts lubricated by lithium-based ILs was mainly attributed to the formation of surface protective films composed of various tribochemical products.

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