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Article Dans Une Revue Journal of Physical Chemistry C Année : 2015

Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces

Résumé

Using synchrotron radiation Near-Ambient Pressure X-ray photoemission spectroscopy (NAP-XPS) in surface and bulk sensitive conditions, we specifically explored the depth distribution of Na+ ions near the vapor/liquid interface of saturated solutions of sodium halides (NaCl, NaBr, and NaI) kept at 278 K under a pressure of 8 mbar. By varying the photoelectron kinetic energy, and hence the probing depth, we show that the Na+ depth distribution near the surface is highly sensitive to the size and polarizability of the anion. The large polarizable anions, Br– and I– that segregate at the surface, tend to drag the Na+ ions closer to the liquid–water surface. However, this situation is not observed for the NaCl solution, in line with recent theoretical results.

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Chimie
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Dates et versions

hal-01480753 , version 1 (01-03-2017)

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Citer

Héloïse Tissot, Giorgia Oivieri, Jean-Jacques Gallet, Fabrice Bournel, Mathieu G. Silly, et al.. Cation Depth-Distribution at Alkali Halide Aqueous Solution Surfaces. Journal of Physical Chemistry C, 2015, 119 (17), pp.9253-9259. ⟨10.1021/jp512695c⟩. ⟨hal-01480753⟩
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