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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Acknowledgments
The authors are grateful to National Natural Science Foundation of China (Grant Nos. 51605471 and 51505460) and National 973 program (No. 2013CB632301) for financial support.
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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.
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Jiang, C., Li, W., Nian, J. et al. Tribological evaluation of environmentally friendly ionic liquids derived from renewable biomaterials. Friction 6, 208–218 (2018). https://doi.org/10.1007/s40544-017-0170-x
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DOI: https://doi.org/10.1007/s40544-017-0170-x