Issue 37, 2013

Quantized friction across ionic liquid thin films


Ionic liquids – salts in the liquid state under ambient conditions – are of great interest as precision lubricants. Ionic liquids form layered structures at surfaces, yet it is not clear how this nano-structure relates to their lubrication properties. We measured the friction force between atomically smooth solid surfaces across ionic liquid films of controlled thickness in terms of the number of ion layers. Multiple friction–load regimes emerge, each corresponding to a different number of ion layers in the film. In contrast to molecular liquids, the friction coefficients differ for each layer due to their varying composition.

Graphical abstract: Quantized friction across ionic liquid thin films

Supplementary files

Article information

Article type
03 Jul 2013
06 Aug 2013
First published
07 Aug 2013
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2013,15, 15317-15320

Quantized friction across ionic liquid thin films

A. M. Smith, K. R. J. Lovelock, N. N. Gosvami, T. Welton and S. Perkin, Phys. Chem. Chem. Phys., 2013, 15, 15317 DOI: 10.1039/C3CP52779D

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