arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0802.1986cond-mat.softphysics.chem-ph
收藏

离子型表面活性剂浓溶液中的双电层

Electric double layer in concentrated solutions of ionic surfactants

R. Tsekov

摘要:

建立了一个简单的非局部理论模型,将浓离子表面活性剂溶液视为常规溶液。它们的热力学是由Cahn-Hilliard理论与静电耦合描述的。发现不稳定解具有两个临界温度,在此温度下,所有特征长度的温度系数都是不连续的。在低于较低临界温度的温度下,离子表面活性剂溶液分离成分布在整个系统上的带相反电荷的液体薄层,并且电势是严格周期性的。在两个临界温度之间的温度下,分离只能在溶液表面附近发生,从而导致双电层的衰减。在高于较高临界温度的温度下以及在稳定溶液中,没有分离,并且电势呈指数衰减。

英文摘要:

A simple non-local theoretical model is developed considering concentrated ionic surfactant solutions as regular ones. Their thermodynamics is described by the Cahn-Hilliard theory coupled with electrostatics. It is discovered that unstable solutions possess two critical temperatures, where the temperature coefficients of all characteristic lengths are discontinuous. At temperatures below the lower critical temperature ionic surfactant solutions separate into thin layers of oppositely charged liquids spread across the whole system and the electric potential is strictly periodic. At temperatures between the two critical temperatures separation can occur only near the solution surface thus leading to an oscillatory-decaying electric double layer. At temperatures above the higher critical temperature as well as in stable solutions there is no separation and the electric potential decays exponentially.

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。

↑