Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 1, Pages 189-193Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b02960
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Funding
- European Innovative Training Network (ITN) Transport of Soft Matter at the Nanoscale (NANOTRANS)
- [16J00042]
- Grants-in-Aid for Scientific Research [16J00042] Funding Source: KAKEN
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The electrolyte surface tension exhibits a characteristic minimum around a salt concentration of 1 mM for all ion types, known as the Jones Ray effect. We show that a consistent description of the experimental surface tension of salts, bases, and acids is possible by assuming charged impurities in the water with a surface affinity typical for surfactants. Comparison with experimental data yields an impurity concentration in the nanomolar range, well below the typical experimental detection limit. Our modeling reveals salt-screening enhanced impurity adsorption as the mechanism behind the Jones-Ray effect: for very low salt concentration added salt screens the electrostatic repulsion between impurities at the surface, which dramatically increases impurity adsorption and thereby reduces the surface tension.
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