Abstract
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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Weimin LIU. Professor, got his PhD degree in 1990 at Lanzhou Institute of Chemical Physics. Currently, he is a full professor of Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, and the director of the State Key Laboratory of Solid Lubrication. His research interests are lubricating materials and technologies and space tribology. He has published over 400 journal papers that received over 5000 citations by SCI journals. He has gained a number of national scientific awards.
Mingjin FAN. Associate professor, obtained her bachelor degree in 2002 from Department of Chemistry & Engineering, Baoji University of Arts & Science and Ph. D degree in 2007 from State Key Laboratory of Applied Organic Chemistry, Lanzhou University. In 2007, she went to Germany as a post doctor (Alexander von Humboldt Fellowship) and studied in the department of chemistry in Technical University of Munich. On Jan. 2009, she came back and began to work at State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. She was promoted to Assistant Professor in 2007 and then to Associate Professor in 2009 at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Her research interests mainly focus on the investigation of new lubricants for rigorous environments.
Zenghong SONG. PhD candidate, obtained her bachelor degree in 2009 from Linyi University. Since then, she has been studied as a Master-PhD candidade in the State Key Laboratory of Solid Lubrication at Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. Her research interests are synthesis and tribological property investigations of novel ionic liquid lubricants.
An erratum to this article is available at http://dx.doi.org/10.1007/s40544-014-0066-y.
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Song, Z., Liang, Y., Fan, M. et al. Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs). Friction 1, 222–231 (2013). https://doi.org/10.1007/s40544-013-0019-x
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DOI: https://doi.org/10.1007/s40544-013-0019-x