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Micro- To Nano- To from Surface to Bulk: Influence of Halogen-Free Ionic Liquid Architecture and Dissociation on Green Oil Lubricity
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
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2021 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 9, no 40, p. 13606-13617Article in journal (Refereed) Published
Abstract [en]

Four nonhalogenated ionic liquids (ILs) based on the same phosphonium cation are investigated in terms of the anion suitability for enhancing the lubricity of a biodegradable oil. For all test conditions, typical for industrial machine components, the lubrication is shown to be governed by nonsacrificial films formed by the physisorption of ionic species on the tribo-surfaces. The anionic structure appears to have an important role in the formation of friction modifying films. The orthoborate ILs exhibit the formation of robust ionic boundary films, resulting in reduced friction and better wear protection. On the contrary, the surface adsorption of phosphinate and phosphate ILs appears to antagonistically disrupt the intrinsic lubrication properties of the biodegradable oil, resulting in high friction and wear. Through additional investigations, it is postulated that the higher dissociation of orthoborate ILs in the biodegradable oil allows the formation of hierarchical and electrostatically overscreened layer structures with long-range order, whereas the ILs with phosphate and phosphinate anions exhibit low dissociation in biodegradable oil, possibly due to the ion pairs being surrounded by a hydrocarbon halo, which presumably results in weak adsorption to form a mixed interfacial layer with no long-range order. © 2021 The Authors. 

Place, publisher, year, edition, pages
American Chemical Society , 2021. Vol. 9, no 40, p. 13606-13617
Keywords [en]
elastohydrodynamic lubrication, friction, ion dissociation, lubricant additives, lubricity, nonhalogenated ionic liquids, surface adsorption, Additives, Adsorption, Dissociation, Ionic liquids, Lubricants, Negative ions, Shafts (machine components), Tribology, Van der Waals forces, Wear of materials, Bio-degradable oil, Halogen-free ionic liquids, Ion dissociations, Long range orders, Nonhalogenated ionic liquid, Ortho-borates, Phosphinate
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:ri:diva-56920DOI: 10.1021/acssuschemeng.1c04854Scopus ID: 2-s2.0-85117307754OAI: oai:DiVA.org:ri-56920DiVA, id: diva2:1613417
Note

 Funding details: Stiftelsen för Strategisk Forskning, SSF, EM16-0013; Funding details: Knut och Alice Wallenbergs Stiftelse, KAW2012.0078; Funding details: Vetenskapsrådet, VR, 2018-05017; 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: 2021-11-22 Created: 2021-11-22 Last updated: 2023-05-25Bibliographically approved

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Rutland, Mark W.

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