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Micro/Nano-tribological Properties of Binary-Doped Ionic Liquid Lubricating Films on Alkyl Silane-Modified Silicon Surfaces

Abstract

In this work, a series of novel binary-doped ionic liquid lubricating films on alkyl silane N-3-(trimethoxysilyl)propylethylenediamine-modified silicon substrates were fabricated. The micro/nano-tribological properties of the films were analyzed. The results showed that the nano-adhesion reduced 63% compared to the silicon substrate and the nano-friction forces were also dramatically decreased. Moreover, the microscale friction coefficient was decreased to 0.09 under 100 mN, and the durability of the film is longer than 4500 s under 400 mN. The apparent improvements are ascribed to the synergistic effect of the load-bearing capacity of the bonded 1-carboxyethyl-3-methylimidazolium chloride molecules and the highly fluidity self-replenishment property of the mobilized 1-dodecyl-3-methylimidazolium hexafluorophosphate molecules. The research is expected to provide references for producing new surfaces in micro/nano-electromechanical systems.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China [Grant Nos. 51405413, 51605409], Special Projects of Changsha Zhuzhou Xiangtan National Independent Innovation Demonstration Zone [Grant Nos. 2018XK2302, 2017XK2107], and Natural Science Foundation of Hunan Province [Grant No. 2018JJ4055].

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Correspondence to Sisi Liu.

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Liu, S., Ruan, S., Huang, X. et al. Micro/Nano-tribological Properties of Binary-Doped Ionic Liquid Lubricating Films on Alkyl Silane-Modified Silicon Surfaces. Tribol Lett 68, 12 (2020). https://doi.org/10.1007/s11249-019-1255-7

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Keywords

  • Silicon
  • Binary-doped ionic liquids
  • Atomic force microscopy
  • Lubricating films
  • Micro/nano-tribological properties