arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.05897cond-mat.softcond-mat.stat-mech
收藏

在拮抗盐存在下消失的水/油界面

The vanishing water/oil interface in the presence of antagonistic salt

Gudrun Glende, Astrid S. de Wijn, Faezeh Pousaneh

摘要:

拮抗盐是由亲水性和疏水性离子组成的盐。在水和有机溶剂的二元混合物中,这些离子优先溶解到不同的相中。我们通过分子动力学(MD)模拟研究了拮抗盐四苯基氯化磷PPh $_4$ Cl在水和2,6-二甲基吡啶混合物中的作用。随着盐浓度的增加,两相区收缩,界面张力降低,这与向这种混合物中加入正常盐时发生的情况相反。MD模拟使我们能够详细研究表面张力降低背后的机制。我们得到了界面周围的离子和组分分布,并确定了系统中的氢键,并得出结论,盐的加入改变了氢键。

英文摘要:

Antagonistic salts are salts which consist of hydrophilic and hydrophobic ions. In a binary mixture of water and organic solvent, these ions preferentially dissolve into different phases. We investigate the effect of an antagonistic salt, tetraphenylphosphonium chloride PPh$_4$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 alter the hydrogen bonding.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑