Michler Dominik, Shahidzadeh Noushine, Westbroek Marise, van Roij René, Bonn Daniel
van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
Langmuir. 2015 Jan 27;31(3):906-11. doi: 10.1021/la504801g. Epub 2015 Jan 15.
It is well known that surfactants decrease both water/air and water/oil interfacial tensions whereas in contrast inorganic salts increase both. We study a new, third class of surface-active ionic solutes, which have been called antagonistic salts, consisting of an organic group with a small inorganic counterion. These show decreased interfacial tension at the oil/water interface due to a redistribution of the organic group in the oil but do not show any surface activity at the air/water interface and are consequently different from surfactants that lower both tensions. We use a simple modeling using Poisson-Boltzmann theory that accounts for the surface activity of the antagonistic salt at the water/oil interface.
众所周知，表面活性剂会降低水/空气和水/油的界面张力，而无机盐则会使这两种界面张力都增加。我们研究了一类新的、第三种表面活性离子溶质，它们被称为拮抗盐，由带有小无机抗衡离子的有机基团组成。由于有机基团在油中的重新分布，这些溶质在油/水界面处显示出降低的界面张力，但在空气/水界面处不显示任何表面活性，因此不同于能降低两种界面张力的表面活性剂。我们使用基于泊松-玻尔兹曼理论的简单模型来解释拮抗盐在水/油界面的表面活性。
