Tribotronic control of friction in oil-based lubricants with ionic liquid additives
2016 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, no 34, 23657-23662 p.Article in journal (Refereed) Published
Atomic force microscopy (AFM) reveals that tribotronic control of friction using an external potential applied to a gold surface is possible for ionic liquid (IL) concentrations as low as 5 mol% in hexadecane. The IL used is trihexyl(tetradecyl) phosphonium bis(2,4,4-trimethylpentyl)phosphinate, in which both the cation and anion have surfactant-like structures, and is miscible with hexadecane in all proportions. For IL concentrations less than 5 mol% friction does not vary with applied potential, but for 5 mol% and above changing the potential changes the composition of the IL boundary layer from cation-enriched (negative potentials) to anion-enriched (positive potentials). As the lubricities of the cation-rich and anion-rich boundary layers differ, this enables active control of friction in oil-based lubricants.
Place, publisher, year, edition, pages
2016. Vol. 18, no 34, 23657-23662 p.
IdentifiersURN: urn:nbn:se:kth:diva-193397DOI: 10.1039/c6cp04405kISI: 000382107200025PubMedID: 27511143ScopusID: 2-s2.0-84984622214OAI: oai:DiVA.org:kth-193397DiVA: diva2:1037203
QC 201610142016-10-142016-10-032016-10-14Bibliographically approved