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Control of Nanoscale Friction on Gold in an Ionic Liquid by a Potential-Dependent Ionic Lubricant Layer
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2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 15, 155502- p.Article in journal (Refereed) Published
Abstract [en]

The lubricating properties of an ionic liquid on gold surfaces can be controlled through application of an electric potential to the sliding contact. A nanotribology approach has been used to study the frictional behavior of 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate ([Py-1,Py-4]FAP) confined between silica colloid probes or sharp silica tips and a Au(111) substrate using atomic force microscopy. Friction forces vary with potential because the composition of a confined ion layer between the two surfaces changes from cation-enriched (at negative potentials) to anion-enriched (at positive potentials). This offers a new approach to tuning frictional forces reversibly at the molecular level without changing the substrates, employing a self-replenishing boundary lubricant of low vapor pressure.

Place, publisher, year, edition, pages
2012. Vol. 109, no 15, 155502- p.
Keyword [en]
Atomic force microscopy, Electric potential, Gold, Ionic liquids, Silica, Substrates
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-105000DOI: 10.1103/PhysRevLett.109.155502ISI: 000309658300014Scopus ID: 2-s2.0-84867294548OAI: oai:DiVA.org:kth-105000DiVA: diva2:569996
Funder
Swedish Research Council
Note

QC 20121116

Available from: 2012-11-16 Created: 2012-11-15 Last updated: 2017-12-07Bibliographically approved

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