Addition of low concentrations of an ionic liquid to a base oil reduces friction over multiple length scales: a combined nano- and macrotribology investigation

Li, Hua, Somers, Anthony E., Howlett, Patrick C, Rutland, Mark W., Forsyth, Maria and Atkin, Rob 2016, Addition of low concentrations of an ionic liquid to a base oil reduces friction over multiple length scales: a combined nano- and macrotribology investigation, Physical chemistry chemical physics, vol. 18, no. 9, pp. 6541-6547, doi: 10.1039/c5cp07061a.

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Title Addition of low concentrations of an ionic liquid to a base oil reduces friction over multiple length scales: a combined nano- and macrotribology investigation
Author(s) Li, Hua
Somers, Anthony E.
Howlett, Patrick CORCID iD for Howlett, Patrick C orcid.org/0000-0002-2151-2932
Rutland, Mark W.
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Atkin, Rob
Journal name Physical chemistry chemical physics
Volume number 18
Issue number 9
Start page 6541
End page 6547
Total pages 7
Publisher Royal Society of Chemistry
Place of publication London, Eng.
Publication date 2016
ISSN 1463-9084
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
PRESSURE-VISCOSITY COEFFICIENT
ATOMIC-FORCE MICROSCOPY
NEAR-SURFACE STRUCTURE
LUBRICANT ADDITIVES
ANTIWEAR PERFORMANCE
SILICA SURFACES
TEMPERATURE
INTERFACE
NANOSTRUCTURE
NANOTRIBOLOGY
Summary The efficacy of ionic liquids (ILs) as lubricant additives to a model base oil has been probed at the nanoscale and macroscale as a function of IL concentration using the same materials. Silica surfaces lubricated with mixtures of the IL trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate and hexadecane are probed using atomic force microscopy (AFM) (nanoscale) and ball-on-disc tribometer (macroscale). At both length scales the pure IL is a much more effective lubricant than hexadecane. At the nanoscale, 2.0 mol% IL (and above) in hexadecane lubricates the silica as well as the pure IL due to the formation of a robust IL boundary layer that separates the sliding surfaces. At the macroscale the lubrication is highly load dependent; at low loads all the mixtures lubricate as effectively as the pure IL, whereas at higher loads rather high concentrations are required to provide IL like lubrication. Wear is also pronounced at high loads, for all cases except the pure IL, and a tribofilm is formed. Together, the nano- and macroscales results reveal that the IL is an effective lubricant additive - it reduces friction - in both the boundary regime at the nanoscale and mixed regime at the macroscale.
Language eng
DOI 10.1039/c5cp07061a
Field of Research 02 Physical Sciences
03 Chemical Sciences
091205 Functional Materials
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083338

Document type: Journal Article
Collection: Institute for Frontier Materials
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