Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Water on Surfaces
O 6.9: Vortrag
Montag, 1. April 2019, 12:45–13:00, H16
Single ion hydrates under the SPM tip — •Jinbo Peng1, Duanyun Cao1, Zhili He1, Jing Guo1, Prokop Hapala2, Runze Ma1, Bowei Cheng1, Ji Chen3, Wen Jun Xie1, Xin-Zheng Li1, Pavel Jelínek2, Li-Mei Xu1, Yi Qin Gao1, En-Ge Wang1, and Ying Jiang1 — 1Peking University — 2Czech Academy of Sciences — 3University College London
Ion hydration and transport at interfaces are relevant to a wide range of applied fields and natural processes. To correlate atomic structure with the transport properties of hydrated ions, both the interfacial inhomogeneity and the complex competing interactions among ions, water and surfaces require detailed molecular-level characterization. Here we constructed individual sodium ion (Na+) hydrates on a NaCl(001) surface by progressively attaching single water molecules to the Na+ using a combined scanning tunnelling microscopy(STM) and atomic force microscopy(AFM) system. We found that the Na+ hydrated with three water molecules diffuses orders of magnitude more quickly than other ion hydrates. Ab initio calculations revealed that such high ion mobility arises from the existence of a metastable state, in which the three water molecules around the Na+ can rotate collectively with a rather small energy barrier. Our work suggests that anomalously high diffusion rates for specific hydration numbers of ions are generally determined by the degree of symmetry match between the hydrates and the surface lattice. Reference: Peng, J. et al. Nature 557, 701 (2018) Peng, J. et al, Nat. Commun. 9, 122 (2018)