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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, art. no. 155502Article in journal (Refereed)
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(penta-uoroethyl) tri-uorophosphate ([Py 1,4]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, art. no. 155502
Keyword [en]
Control of nanoscale friction on gold in an ionic liquid by a potential-dependent ionic lubricant layer
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27385OAI: oai:DiVA.org:ri-27385DiVA: diva2:1054389
Note
A3064Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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