Issue 34, 2016
From the journal:

Physical Chemistry Chemical Physics

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

P. K. Cooper,a   H. Li,a   M. W. Rutland,bc   G. B. Webbera  and  R. Atkin*a  

* Corresponding authors

a Priority Research Centre for Advanced Fluids and Interfaces, Newcastle Institute for Energy and Resources, University of Newcastle, Callaghan, NSW 2308, Australia
E-mail: rob.atkin@newcastle.edu.au

b KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, SE-100 44 Stockholm, Sweden

c SP Technical Research Institute of Sweden, SP Chemistry, Materials and Surfaces, SE-114 86 Stockholm, Sweden

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.

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

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Article information

DOI
https://doi.org/10.1039/C6CP04405K
Article type
Paper
Submitted
23 Jun 2016
Accepted
03 Aug 2016
First published
03 Aug 2016

Phys. Chem. Chem. Phys., 2016,18, 23657-23662

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

P. K. Cooper, H. Li, M. W. Rutland, G. B. Webber and R. Atkin, Phys. Chem. Chem. Phys., 2016, 18, 23657 DOI: 10.1039/C6CP04405K

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