Antagonistic salts are salts that consist of hydrophilic and hydrophobic ions. In a binary mixture of water and an organic solvent, these ions preferentially dissolve into different phases. We investigate the effect of an antagonistic salt, tetraphenylphosphonium chloride ${\text{PPh}}_4^{+}{\text{Cl}}^{-}$, in a mixture of water and 2,6-lutidine by means of Molecular Dynamics (MD) simulations. For increasing concentrations of the salt, the two-phase region is shrunk and the interfacial tension in reduced, in contrast to what happens when a normal salt is added to such a mixture. The MD simulations allow us to investigate in detail the mechanism behind the reduction of the surface tension. We obtain the ion and composition distributions around the interface and determine the hydrogen bonds in the system and conclude that the addition of salt alters the hydrogen bonding.

中文翻译：

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拮抗盐存在下水/油界面消失

拮抗盐是由亲水和疏水离子组成的盐。在水和有机溶剂的二元混合物中，这些离子优先溶解成不同的相。我们研究了拮抗盐四苯基氯化chloride的作用${\text{聚丙烯}}_4^{+}{\text{氯}}^{-}$通过分子动力学（MD）模拟在水和2,6-二甲基吡啶的混合物中 为了增加盐的浓度，与将普通盐添加到这种混合物中时的情况相反，两相区域收缩并且界面张力减小。MD模拟使我们能够详细研究降低表面张力的机制。我们获得界面周围的离子和组成分布，并确定系统中的氢键，并得出结论，添加盐会改变氢键。