Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 17: Solid-Liquid Interfaces I: Reactions and Electrochemistry
O 17.1: Talk
Monday, March 16, 2020, 15:00–15:15, TRE Phy
Hydration layers at the graphite-water interface: Attraction or confinement? — Hagen Söngen1, Ygor Morais Jaques2, Lidija Zivanovic2, Sebastian Seibert1, •Ralf Bechstein1, Peter Spijker2, Hiroshi Onishi3, Adam S. Foster2, 4, and Angelika Kühnle1 — 1Physical Chemistry I, Bielefeld University, Germany — 2COMP Centre of Excellence, Department of Applied Physics, Aalto University, Helsinki, Finland — 3Department of Chemistry, Kobe University, Japan — 4Division of Electrical Engineering and Computer Science, Kanazawa University, Japan
Water molecules at solid surfaces typically arrange in layers. The physical origin of the hydration layers is usually explained by (1) the attraction between the surface and the water and/or (2) the confinement of water due to the presence of the surface. While attraction is specific for the particular solid-solvent combination, confinement is a general effect at surfaces. A differentiation between the two effects is critical for interpreting hydration structures. At the graphite-water interface, the solid-solvent attraction is often considered to be negligible. Nevertheless, we observe hydration layers using three-dimensional atomic force microscopy at the graphite-water interface. We use Monte Carlo simulations to explain why confinement alone could cause the formation of hydration layers. With molecular dynamics simulations, we show that at ambient conditions, there is a significant graphite-water attraction which is pivotal for the formation of layers at the graphite-water interface.
[1] H. Söngen et al., Physical Review B, 100 (2019) 205410