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Friction 2013, 1(3): 222-231 https://doi.org/10.1007/s40544-013-0019-x
Research Article | Open Access | Issue | Published: 06 September 2013

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

Show Author's Information Zenghong SONG1,2,  Yongmin LIANG1,  Mingjin FAN1,*( ),  Feng ZHOU1,  Weimin LIU1,*( )
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100049, China
Keywords:
tribology, ionic liquids, sym-triazine, cyclotriphosphazene, additives, multiply alkylated cyclopentanes
An erratum to this article is available online at https://doi.org/10.1007/s40544-014-0066-y
Cite this article:
SONG Z, LIANG Y, FAN M, et al. Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs). Friction, 2013, 1(3): 222-231. https://doi.org/10.1007/s40544-013-0019-x
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Abstract Full text About this article

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 ℃. 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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About this article

Lithium-based ionic liquids as novel lubricant additives for multiply alkylated cyclopentanes (MACs)

Show Author's information Zenghong SONG1,2, Yongmin LIANG1, Mingjin FAN1,*( ), Feng ZHOU1, Weimin LIU1,*( )
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100049, China

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 ℃. 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.

Keywords: tribology, ionic liquids, sym-triazine, cyclotriphosphazene, additives, multiply alkylated cyclopentanes

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Publication history
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Publication history

Received: 11 April 2013
Revised: 31 May 2013
Accepted: 14 June 2013
Published: 06 September 2013
Issue date: September 2013

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© The author(s) 2013

Acknowledgements

The authors are gratefully acknowledge the support of this work by The National Natural Science Foundation of China (NSFC) (Nos. 51105353, 51175492, and 21173243) and The National Key Basic Research and Development (973) Program of China project (2013CB632300). The authors would like to thank Enayo for the English language review.

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