Ion specific hydration in nano-confined electrical double layers

[Display omitted] We probe counter-ion specific effects in nano-confined electrical-double-layers (EDLs) by means of direct force measurements across a model slit pore in the extended surface forces apparatus. By variation of solution composition, we compare four different counter-ions with dissimil...

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Bibliographic Details
Published in:Journal of colloid and interface science 2017-11, Vol.506, p.263-270
Main Authors: Zachariah, Z., Espinosa-Marzal, R.M., Heuberger, M.P.
Format: Article
Language:English
Subjects:
Confinement
Electrical double layer
Hydration
Ion specificity
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Summary:[Display omitted] We probe counter-ion specific effects in nano-confined electrical-double-layers (EDLs) by means of direct force measurements across a model slit pore in the extended surface forces apparatus. By variation of solution composition, we compare four different counter-ions with dissimilar hydration properties, namely Na+, K+, Cs+ as well as H3O+, all confined between (001) mica surfaces. We discuss the results in terms of a recently proposed π–transition model, evoking hydrated ion layering as the recurrent structural element in highly confined EDLs. We demonstrate that the π–transition essentially proceeds in multiple steps in coherence with the event of single- or multiple- hydrated-ion layering.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2017.07.039