Novel halogen-free chelated orthoborate-phosphonium ionic liquids : synthesis and tribophysical properties

Shah, Faiz Ullah, Glavatskih, Sergei, MacFarlane, Douglas R., Somers, Anthony, Forsyth, Maria and Antzutkin, Oleg N. 2011, Novel halogen-free chelated orthoborate-phosphonium ionic liquids : synthesis and tribophysical properties, Physical chemistry chemical physics, vol. 13, no. 28, pp. 12865-12873.

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Title Novel halogen-free chelated orthoborate-phosphonium ionic liquids : synthesis and tribophysical properties
Author(s) Shah, Faiz Ullah
Glavatskih, Sergei
MacFarlane, Douglas R.
Somers, AnthonyORCID iD for Somers, Anthony
Forsyth, MariaORCID iD for Forsyth, Maria
Antzutkin, Oleg N.
Journal name Physical chemistry chemical physics
Volume number 13
Issue number 28
Start page 12865
End page 12873
Total pages 9
Publisher Royal Society of Chemistry
Place of publication Cambridge, U. K.
Publication date 2011-07-28
ISSN 1463-9076
Keyword(s) halogen-free ionic liquids
halogen-free orthoborate ionic liquids (hf-BILs)
lubricant applications
Summary We 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.
Notes Article first available online 20th June 2011
Language eng
Field of Research 091205 Functional Materials
091207 Metals and Alloy Materials
030304 Physical Chemistry of Materials
Socio Economic Objective 860603 Lubricants
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, The Owner Societies
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