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A Facile Route to C2-Substituted Imidazolium Ionic Liquids
Molecules 2009, 14(6), 2286-2305; doi:10.3390/molecules14062286

Ionic Liquids in Tribology

Department of Chemical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate, 020-8551, Japan
Received: 24 May 2009 / Revised: 20 June 2009 / Accepted: 23 June 2009 / Published: 24 June 2009
(This article belongs to the Special Issue Ionic Liquids)
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Current research on room-temperature ionic liquids as lubricants is described. Ionic liquids possess excellent properties such as non-volatility, non-flammability, and thermo-oxidative stability. The potential use of ionic liquids as lubricants was first proposed in 2001 and approximately 70 articles pertaining to fundamental research on ionic liquids have been published through May 2009. A large majority of the cations examined in this area are derived from 1,3-dialkylimidazolium, with a higher alkyl group on the imidazolium cation being beneficial for good lubrication, while it reduces the thermo-oxidative stability. Hydrophobic anions provide both good lubricity and significant thermo-oxidative stability. The anions decompose through a tribochemical reaction to generate metal fluoride on the rubbed surface. Additive technology to improve lubricity is also explained. An introduction to tribology as an interdisciplinary field of lubrication is also provided.
Keywords: synthetic lubricant; surface chemistry; molecular design; friction and wear; thermo-oxidative stability synthetic lubricant; surface chemistry; molecular design; friction and wear; thermo-oxidative stability
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Minami, I. Ionic Liquids in Tribology. Molecules 2009, 14, 2286-2305.

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