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Nanolubrication in deep eutectic solvents

Hallett, J. E. ORCID:, Hayler, H. J. and Perkin, S. (2020) Nanolubrication in deep eutectic solvents. Physical Chemistry Chemical Physics, 22 (36). pp. 20253-20264. ISSN 1463-9076

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To link to this item DOI: 10.1039/D0CP03787G


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].

Item Type:Article
Divisions:No Reading authors. Back catalogue items
ID Code:101365
Publisher:Royal Society of Chemistry


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