4 years ago

Identification of Single Adsorbed Cations on Mica–Liquid Interfaces by 3D Force Microscopy

Identification of Single Adsorbed Cations on Mica–Liquid Interfaces by 3D Force Microscopy
Daniel Martin-Jimenez, Ricardo Garcia
Force microscope provides atomically resolved images of surfaces immersed in a liquid. The presence of different chemical species in the interface (cations, anions, water, neutral atoms) complicates the adscription of the observed features to a given species. We develop a 3D atomic force microscopy method to identify the cations adsorbed on a mica surface from a potassium chloride solution. The method is based on measuring the peak value of the attractive force within the Stern layer. The maximum of the attractive force shows site-specific variations. The positions with the highest attractive force values are associated with the presence of adsorbed potassium ions, while the other positions are associated with a local depletion of the hydration layer. This criterion provides a surface coverage of K cations that is consistent with the one reported by other techniques.

Publisher URL: http://dx.doi.org/10.1021/acs.jpclett.7b02671

DOI: 10.1021/acs.jpclett.7b02671

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