Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 9: Nanotribology
O 9.6: Talk
Monday, March 11, 2013, 11:45–12:00, H42
Electrochemical control of friction in an ionic liquid — •Florian Hausen1, Judith Hoth1, James Sweeney2, Robert Hayes2, Grant B. Webber2, Frank Endres3, Mark W. Rutland4, Roland Bennewitz1, and Rob Atkin2 — 1INM - Leibniz-Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany — 2Centre for Advanced Particle Processing and Transport, The University of Newcastle, Callaghan, NSW 2308, Australia — 3Institute of Particle Technology, Clausthal University of Technology, Arnold-Sommerfeld-Strasse 6, 38678 Clausthal, Germany — 4Department of Chemistry, Royal Institute of Technology, Drottning Kristinas Väg 51, SE-10044 Stockholm, Sweden
Ionic liquids are potential novel lubricants due to some unique properties which can be changed systematically by variation of the ion structures. Ionic liquids form ordered layers of anions and cations at solid interfaces which can be probed by atomic force microscopy and controlled by varying the electrode potential. Friction force microscopy with colloidal probes and sharp tips has been performed under electrochemical control to reveal the influence of the ordered layers of the ionic liquid [Py1,4][FAP] on the tribological behaviour of gold [1]. It is found that friction forces decrease for negative potentials which is attributed to a lubricating effect of the cation. The control of friction in ionic liquids by electrochemical potentials is based on confined ionic liquid layers rather than on a modification of the underlying surface itself as observed for aqueous electrolytes.
[1] J. Sweeney, et al., Phys. Rev. Lett. 2012, 109, 155502