Specific cation effects at aqueous solution−vapor interfaces: Surfactant-like behavior of Li + revealed by experiments and simulations
| Autor: | John C. Hemminger, Krista M. Parry, Kathryn A. Perrine, Abraham C. Stern, Bernd Winter, Douglas J. Tobias, J. Alfredo Freites, Michael J. Makowski, Marijke H. C. Van Spyk |
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| Rok vydání: | 2017 |
| Předmět: |
Multidisciplinary
Aqueous solution 010304 chemical physics Hofmeister series Chemistry Inorganic chemistry Halide 010402 general chemistry Alkali metal 01 natural sciences 0104 chemical sciences Ion Molecular dynamics Adsorption Pulmonary surfactant TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY 0103 physical sciences |
| Zdroj: | Proceedings of the National Academy of Sciences of the USA |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1707540114 |
| Popis: | It is now well established by numerous experimental and computational studies that the adsorption propensities of inorganic anions conform to the Hofmeister series. The adsorption propensities of inorganic cations, such as the alkali metal cations, have received relatively little attention. Here we use a combination of liquid-jet X-ray photoelectron experiments and molecular dynamics simulations to investigate the behavior of K+ and Li+ ions near the interfaces of their aqueous solutions with halide ions. Both the experiments and the simulations show that Li+ adsorbs to the aqueous solution−vapor interface, while K+ does not. Thus, we provide experimental validation of the “surfactant-like” behavior of Li+ predicted by previous simulation studies. Furthermore, we use our simulations to trace the difference in the adsorption of K+ and Li+ ions to a difference in the resilience of their hydration shells. |
| Databáze: | OpenAIRE |
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