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Boundary lubricity of phosphonium bisoxalatoborate ionic liquids
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden; Tokyo University of Science, Japan.
Luleå University of Technology, Sweden.
Axel Christiernsson International AB, Sweden.
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2021 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 161, article id 107075Article in journal (Refereed) Published
Abstract [en]

The lubricating performance of trihexyl(tetradecyl)phosphonium bisoxalatoorthoborate (P-BOB) ionic liquid is analysed at 80 °C and 140 °C, and compared to an ionic liquid containing a partially hydrated version of the anion. The reduction of the anions produces oxalate complexes that contribute synergistically to lower friction. The role of oxalate in enhancing lubricity was indicated by the fact that the partially hydrated anion is a precursor orthoborate anion complexed with oxalic acid. It consequently showed the lowest friction at 80 °C. Upon heating, the precursor was converted into [BOB]− and displayed the same friction at 140 °C as the fully synthesised species. The mechanisms of the breakdown of the [BOB]− anion and formation of the tribofilm are elucidated. © 2021 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd , 2021. Vol. 161, article id 107075
Keywords [en]
Friction, Orthoborate, Oxalate, Wear
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-53469DOI: 10.1016/j.triboint.2021.107075Scopus ID: 2-s2.0-85106485187OAI: oai:DiVA.org:ri-53469DiVA, id: diva2:1565549
Note

Funding details: Vetenskapsrådet, VR, 2018-05017; Funding details: Stiftelsen för Strategisk Forskning, SSF, EM16-0013; Funding details: Knut och Alice Wallenbergs Stiftelse, KAW2012.0078; Funding text 1: The Swedish Foundation for Strategic Research (Project EM16-0013 ), the Knut and Alice Wallenberg Foundation (Project KAW2012.0078 ) and the Swedish Research Council (Project 2018-05017 ) are gratefully acknowledged for financial support.

Available from: 2021-06-14 Created: 2021-06-14 Last updated: 2023-05-25Bibliographically approved

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Rutland, Mark W.

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