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Novel halogen-free chelated orthoborate-phosphonium ionic liquids : synthesis and tribophysical properties
journal contribution
posted on 2011-07-28, 00:00 authored by F Shah, S Glavatskih, D MacFarlane, Anthony SomersAnthony Somers, Maria ForsythMaria Forsyth, O AntzutkinWe report on the synthesis, characterisation, and physical and tribological properties of halogen-free ionic liquids based on various chelated orthoborate anions with different phosphonium cations, both without halogen atoms in their structure. Important physical properties of the ILs including glass transition temperatures, density, viscosity and ionic conductivity were measured and are reported here. All of these new halogen-free orthoborate ionic liquids (hf-BILs) are hydrophobic and hydrolytically stable liquids at room temperature. As lubricants, these hf-BILs exhibit considerably better antiwear and friction reducing properties under boundary lubrication conditions for steel–aluminium contacts as compared with fully formulated (15W-50 grade) engine oil. Being halogen free these hf-BILs offer a more environmentally benign alternative to ILs being currently developed for lubricant applications.
History
Journal
Physical chemistry chemical physicsVolume
13Issue
28Pagination
12865 - 12873Publisher
Royal Society of ChemistryLocation
Cambridge, U. K.ISSN
1463-9076eISSN
1463-9084Language
engNotes
Article first available online 20th June 2011Publication classification
C1 Refereed article in a scholarly journalCopyright notice
2011, The Owner SocietiesUsage metrics
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No categories selectedKeywords
halogen-free ionic liquidshalogen-free orthoborate ionic liquids (hf-BILs)lubricant applicationsScience & TechnologyPhysical SciencesChemistry, PhysicalPhysics, Atomic, Molecular & ChemicalChemistryPhysicsFILM FORMATIONLUBRICANTSBORONPERFORMANCEADDITIVESCONDUCTIVITYTRANSITIONEXTRACTIONEFFICIENCYMONOLAYERS
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