Volume 199, 2017

Dynamic shear force microscopy of confined liquids at a gold electrode

Abstract

The confinement of liquids in nanometer-scale gaps can lead to changes in their viscous shear properties. For liquids of polar molecules, the charge state of the confining surfaces has a significant influence on the structure in the confined liquid. Here we report on the implementation of dynamic shear force microscopy in an electrochemical cell. Lateral oscillations of the tip of an atomic force microscope were magnetically activated at a frequency of about 50 kHz. The damping of the lateral tip oscillation was recorded as a function of the tip–sample distance and of the electrode potential at the surface of a Au(100) single crystal electrode. The influence of surface charges on the shear response of the nano-confined liquids was demonstrated for the ionic liquid [EMIM][NTf2] and for aqueous Na2SO4 solution.

Associated articles

Article information

Article type
Paper
Submitted
21 nov 2016
Accepted
03 jan 2017
First published
03 jan 2017

Faraday Discuss., 2017,199, 299-309

Dynamic shear force microscopy of confined liquids at a gold electrode

G. Krämer, F. Hausen and R. Bennewitz, Faraday Discuss., 2017, 199, 299 DOI: 10.1039/C6FD00237D

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