Tribotronic control of friction in oil-based lubricants with ionic liquid additives

Literature Information

Publication Date 2016-08-03
DOI 10.1039/C6CP04405K
Impact Factor 3.676
Authors

P. K. Cooper, H. Li, G. B. Webber, R. Atkin


View Original

Abstract

Atomic force microscopy (AFM) reveals that tribotronic control of friction using an external potential applied to a gold surface is possible for ionic liquid (IL) concentrations as low as 5 mol% in hexadecane. The IL used is trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, in which both the cation and anion have surfactant-like structures, and is miscible with hexadecane in all proportions. For IL concentrations less than 5 mol% friction does not vary with applied potential, but for 5 mol% and above changing the potential changes the composition of the IL boundary layer from cation-enriched (negative potentials) to anion-enriched (positive potentials). As the lubricities of the cation-rich and anion-rich boundary layers differ, this enables active control of friction in oil-based lubricants.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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