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Water-induced correlation between single ions imaged at the solid–liquid interface

Author

Listed:
  • Maria Ricci

    (Ecole Polytechnique Fédérale de Lausanne, (EPFL))

  • Peter Spijker

    (COMP Centre of Excellence, Aalto University)

  • Kislon Voïtchovsky

    (Ecole Polytechnique Fédérale de Lausanne, (EPFL)
    Durham University)

Abstract

When immersed into water, most solids develop a surface charge, which is neutralized by an accumulation of dissolved counterions at the interface. Although the density distribution of counterions perpendicular to the interface obeys well-established theories, little is known about counterions’ lateral organization at the surface of the solid. Here we show, by using atomic force microscopy and computer simulations, that single hydrated metal ions can spontaneously form ordered structures at the surface of homogeneous solids in aqueous solutions. The structures are laterally stabilized only by water molecules with no need for specific interactions between the surface and the ions. The mechanism, studied here for several systems, is controlled by the hydration landscape of both the surface and the adsorbed ions. The existence of discrete ion domains could play an important role in interfacial phenomena such as charge transfer, crystal growth, nanoscale self-assembly and colloidal stability.

Suggested Citation

  • Maria Ricci & Peter Spijker & Kislon Voïtchovsky, 2014. "Water-induced correlation between single ions imaged at the solid–liquid interface," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5400
    DOI: 10.1038/ncomms5400
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    Cited by:

    1. Giada Franceschi & Pavel Kocán & Andrea Conti & Sebastian Brandstetter & Jan Balajka & Igor Sokolović & Markus Valtiner & Florian Mittendorfer & Michael Schmid & Martin Setvín & Ulrike Diebold, 2023. "Resolving the intrinsic short-range ordering of K+ ions on cleaved muscovite mica," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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