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      Tribological evaluation of environmentally friendly ionic liquids derived from renewable biomaterials

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          Abstract

          Unlike most of the conventional ionic liquids (ILs) derived from non-renewable resources, five environmentally friendly ILs ([Ch][AA] ILs) derived from amino acids (AAs) and choline (Ch) were synthesized using biomaterials by a simple, green route: acid–base reaction of Ch and AAs. The thermal and corrosion properties, as well as viscosity, of the prepared ILs were examined. The results revealed that the anion structure of ILs plays a dominant role in their thermal and viscosity behavior. These ILs exhibited less corrosion toward copper, related to their halogen-, sulfur-, and phosphorus-free characteristics. The tribological behavior of the synthesized ILs was examined using a Schwingungs Reibung und Verschleiss tester, and the results indicated that these ILs exhibit good friction-reducing and anti-wear properties as lubricants for steel/steel contact. Results from energy-dispersive spectroscopy and X-ray photoelectron spectroscopy indicated that the good tribological properties of [Ch][AA] ILs are related to the formation of a physically adsorbed film on the metal surface during friction.

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          Ionic liquids. Green solvents for the future

          Ionic liquids, being composed entirely of ions, were once mainly of interest to electrochemists. Recently, however, it has become apparent that,
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            Ionic liquid lubricants: designed chemistry for engineering applications.

            This tutorial review outlines current state of the art research on ionic liquid lubricants. Ionic liquids (ILs) were first reported as very promising high-performance lubricants in 2001 and have attracted considerable attention in the field of tribology since then because of their remarkable lubrication and anti-wear capabilities as compared with lubrication oils in general use; in recent times we have seen dramatically increased interest in the topic. The review starts with a brief introduction to ILs and fluid lubrication, and then discusses in more detail the tribological properties of IL lubricants, either as lubrication oils, additives or thin films. As well as lubrication mechanisms, some current problems and potential solutions are tentatively discussed.
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              Ionic liquids are not always green: hydrolysis of 1-butyl-3-methylimidazolium hexafluorophosphate

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                Author and article information

                Journal
                Tsinghua Science and Technology
                Friction
                Tsinghua University Press (Xueyuan Building, Tsinghua University, Beijing 100084, China )
                2223-7690
                05 June 2018
                : 06
                : 02
                : 208-218 (pp. )
                Affiliations
                [ 1 ] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
                [ 2 ] Qingdao Center of Resource Chemistry & New Materials, Qingdao 266100, China
                Author notes
                * Corresponding author: Wenjing LOU, E-mail: wjlou@ 123456licp.cas.cn

                Wenjing LOU. She received her PhD degree in Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences in 2007. Her current position is an associate researcher in the State Key Laboratory of Solid Lubrication at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Her research areas include nanofluids, nanoparticle lubricant additives, and high performance lubricants.

                Cheng JIANG. She received her PhD degree in Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences in 2013. After then, she worked as an assistant research fellow in State Key Laboratory of Solid Lubrication at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Her research interests mainly focus on high performance lubricants.

                Jingyan NIAN. He received his master degree in physical chemistry in 2012 from Northwest Normal University, Lanzhou, China. During his undergraduate, he joined the State Key Laboratory of Solid Lubrication at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. His current position is an assistant research fellow. His research area covers the atomic-scale friction, superlubricity, and space lubrication.

                Article
                2223-7690-06-02-208
                10.1007/s40544-017-0170-x

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Page count
                Figures: 9, Tables: 2, References: 39, Pages: 11
                Categories
                Research Article

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