Issue 36, 2020

Nanolubrication in deep eutectic solvents


We report surface force balance measurements of the normal surface force and friction between two mica surfaces separated by a nanofilm of the deep eutectic solvent ethaline. Ethaline, a 1 : 2 mixture of choline chloride and ethylene glycol, was studied under dry conditions, under ambient conditions and with added water, revealing surface structural layers and quantised frictional response highly sensitive to water content, including regions of super-lubric behaviour under dry conditions and with added water. We also report exceptionally long-ranged electrostatic repulsion far in excess of that predicted by Debye–Hückel theory for a system with such high electrolyte content, consistent with previously reported observations of “underscreening” in ionic liquid and concentrated aqueous electrolyte systems [Smith et al., J. Phys. Chem. Lett., 2016, 7(12), 2157].

Graphical abstract: Nanolubrication in deep eutectic solvents

Article information

Article type
16 Jul 2020
26 Aug 2020
First published
26 Aug 2020
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2020,22, 20253-20264

Nanolubrication in deep eutectic solvents

J. E. Hallett, H. J. Hayler and S. Perkin, Phys. Chem. Chem. Phys., 2020, 22, 20253 DOI: 10.1039/D0CP03787G

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