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Lubricants 2017, 5(3), 31;

Ionic Liquids as Grease Base Liquids

2,* and 2,*
Priority Research Centre for Advanced Fluids and Interfaces, University of Newcastle, Callaghan, NSW 2308, Australia
School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Received: 10 July 2017 / Revised: 31 July 2017 / Accepted: 4 August 2017 / Published: 8 August 2017
(This article belongs to the Special Issue Ionic Liquids in Tribology)
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The rheological characteristics of one mineral oil and two ionic liquid (IL) based lubricating greases were explored as a function of thickener concentration. The ILs used are 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][TFSI]) and trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P6,6,6,14][TFSI]), with polytetra-fluoroethylene (PTFE) particles used as thickeners. Greases with different base liquid concentrations (60–80 wt %) were investigated using small-amplitude oscillatory shear and viscous flow measurements, and contact angle measurements probed adhesion at base liquid–PTFE interfaces. Rheological properties are influenced by base liquid–PTFE adhesion and the chemical structure of the grease base liquids. With the addition of thickener, the greases generally have higher elasticity, strain resistance, and frequency independent properties. Viscometric rheological tests illustrate non-Newtonian shear-thinning behaviour for all greases. [BMIM][TFSI] based greases show the most elastic properties and strain resistance, as well as the highest initial and lowest final viscosities of the greases tested. View Full-Text
Keywords: ionic liquids; lubricating grease; rheology ionic liquids; lubricating grease; rheology

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Mozes, R.; Cooper, P.K.; Atkin, R.; Li, H. Ionic Liquids as Grease Base Liquids. Lubricants 2017, 5, 31.

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