Projects per year
Hypothesis: The dynamics of the self-assembled liquid nanostructure of the ionic liquids (ILs) near a mica surface can be determined from video-rate atomic force microscopy (AFM) data.Experiments: Video-rate AFM has been used to record the nanostructure dynamics of two most widely studied ILs, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIM TFSI) and ethylam-monium nitrate (EAN), as well as EAN-water mixtures, above a model anode, mica. Diffusion coefficients were extracted from the AFM videos using dynamic differential microscopy and direct tracking.Findings: Video rate AFM is able to record the movement of the IL nanostructure. This is the first time that any liquid has been directly visualized at a scale of 10 nm x 10 nm in real-time. Diffusion coefficients determined from AFM videos reveal IL nanostructures near surfaces diffuse orders of magnitude more slowly than individual ions in the bulk. Thus, rather than free-flowing liquid, the near-surface nanostruc-ture is better conceptualized as self-assembled aggregates of IL ions diffusing slowly over the cation-rich Stern layer, akin to adsorbed surfactant micelles in aqueous systems. This new and surprising insight affects wide-ranging processes involving the interfacial dynamics of concentrated electrolytes.Crown Copyright (c) 2022 Published by Elsevier Inc. All rights reserved.
|Number of pages||8|
|Journal||Journal of Colloid and Interface Science|
|Publication status||Published - 15 Jan 2023|
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Nanoscale Dynamics and Structure of SAILs at Electrodes
Atkin, R., Silvester-Dean, D., Warr, G., Costa Gomes, M. & Padua, A.
25/01/21 → 24/01/24
Nanostructured Ionic-Molecular Hybrid Liquids
Warr, G., Atkin, R., Perkin, S. & Edlar, K.
1/01/20 → 31/12/23
Quantitative Movies of Nanoscale Dynamics by Video Atomic Force Microscopy
Atkin, R., Swaminatha Iyer, K., Ludwig, M., Parish, G., Smith, N., Poinem, G., Hartley, P. & Parsons, D.
1/01/20 → 31/12/20