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Charged Surface-Active Impurities at Nanomolar Concentration Induce Jones–Ray Effect
The Journal of Physical Chemistry Letters ( IF 5.7 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1021/acs.jpclett.7b02960
Yuki Uematsu 1, 2 , Douwe Jan Bonthuis 2 , Roland R. Netz 2
Affiliation  

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.

中文翻译:

纳摩尔浓度的带电表面活性杂质引起琼斯射线效应

对于所有离子类型,电解质表面张力在1 mM的盐浓度附近均表现出特征最小值,称为琼斯射线效应。我们表明,通过假设水中的带电荷杂质具有表面活性剂的典型表面亲合力,可以对盐,碱和酸的实验表面张力进行一致的描述。与实验数据进行比较得出的杂质浓度在纳摩尔范围内,远低于典型的实验检测极限。我们的模型揭示了盐筛分增强了杂质吸附,这是琼斯射线效应背后的机理:对于非常低的盐浓度,添加的盐筛分了表面杂质之间的静电排斥力,从而极大地增加了杂质吸附,从而降低了表面张力。
更新日期:2017-12-26
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