Control of Nanoscale Friction on Gold in an Ionic Liquid by a Potential-Dependent Ionic Lubricant Layer | Zendy

James Sweeney | Zendy; Florian Hausen | Zendy; Robert Hayes | Zendy; Grant B. Webber | Zendy; Frank Endres | Zendy; Mark W. Rutland | Zendy; Roland Bennewitz | Zendy; Rob Atkin | Zendy

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Control of Nanoscale Friction on Gold in an Ionic Liquid by a Potential-Dependent Ionic Lubricant Layer

Author(s) -

James Sweeney,

Florian Hausen,

Robert Hayes,

Grant B. Webber,

Frank Endres,

Mark W. Rutland,

Roland Bennewitz,

Rob Atkin

Publication year - 2012

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.109.155502

Subject(s) - lubricant , materials science , ionic liquid , ion , nanoscopic scale , nanotribology , substrate (aquarium) , layer (electronics) , colloid , chemical physics , ionic bonding , nanotechnology , atomic force microscopy , chemical engineering , composite material , chemistry , organic chemistry , catalysis , oceanography , geology , engineering

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(pentauoroethyl) triuorophosphate ([Py₁,₄]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

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