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

Ricci, M.; Spijker, P.; Voïtchovsky, K.

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.

Citation

Ricci, M., Spijker, P., & Voïtchovsky, K. (2014). Water-induced correlation between single ions imaged at the solid–liquid interface. Nature Communications, 5, Article 4400. https://doi.org/10.1038/ncomms5400

• Journal Article Type: Article
• Acceptance Date: Jun 13, 2014
• Online Publication Date: Jul 16, 2014
• Publication Date: Jul 16, 2014
• Deposit Date: Aug 15, 2014
• Publicly Available Date: Aug 15, 2014
• Journal: Nature Communications
• Electronic ISSN: 2041-1723
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Article Number: 4400
• DOI: https://doi.org/10.1038/ncomms5400
• Public URL: https://durham-repository.worktribe.com/output/1422267