期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep43234
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资金
- Engineering and Physical Sciences Council (UK) [EP/M506321/1]
- European Council (MC-CIG) [631186]
- Durham University (UK)
- Swiss National Science Foundation
- EPSRC [1788302] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1452230] Funding Source: researchfish
The dynamics of ions adsorbed at the surface of immersed charged solids plays a central role in countless natural and industrial processes such as crystal growth, heterogeneous catalysis, electrochemistry, or biological function. Electrokinetic measurements typically distinguish between a so-called Stern layer of ions and water molecules directly adsorbed on to the solid's surface, and a diffuse layer of ions further away from the surface. Dynamics within the Stern layer remain poorly understood, largely owing to a lack of in-situ atomic-level insights. Here we follow the dynamics of single Rb+ and H3O+ ions at the surface of mica in water using high-resolution atomic force microscopy with 25 ms resolution. Our results suggest that single hydrated Rb+ ions reside tau(1) = 104 +/- 5 ms at a given location, but this is dependent on the hydration state of the surface which evolves on a slower timescale of tau(2) = 610 +/- 30 ms depending on H3O+ adsorption. Increasing the liquid's temperature from 5 degrees C to 65 degrees C predictably decreases the apparent glassiness of the interfacial water, but no clear effect on the ions' dynamics was observed, indicating a diffusion-dominated process. These timescales are remarkably slow for individual monovalent ions and could have important implications for interfacial processes in electrolytes.
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