Force measurements between mica surfaces in concentrated electrolyte solutions

Peng Zhang, Zhicheng Liu, Yongkang Wang, Yajing Kan, Yunfei Chen
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Abstract

The force-distance profiles are in agreement with Derjaguin-Landau-Verwey-Overbeek (DLVO) theory in dilute solutions. However as solute concentration being elevated, the deviations from DLVO theoretical prediction are observed with the experiment. In this work, the force as a function of distance between two molecularly smooth mica sheets immersed in concentrated NaCl solutions is measured using the surface forces apparatus (SFA). In 0.1 M solution, the long-range force shows no deviation from DLVO force, while at short distance the discrepancies between experiment and theory can be explained by introducing a hydration force. The fitted surface potential Ψd consists with ion-exchange model prediction by shifting the diffuse layer on the mica surface at a distance of a diameter of hydrated ion. In the more concentrated solutions, the measured results indicate that an extra diffuse layer is formed. Here, the cause of the unexpected phenomenon is due to the effect of crowing and overadsorption by considering co-ions, which result in Na+ and Cl− alternated layering distributions at the interface. Therefore, solidification areas are more likely to be formed under the condition of the confined space, especially in the highly concentrated 3 M and 5 M solutions.
浓电解质溶液中云母表面间的力测量
在稀溶液中,力距分布符合Derjaguin-Landau-Verwey-Overbeek (DLVO)理论。但随着溶质浓度的升高,实验结果与DLVO理论预测结果存在偏差。在这项工作中,使用表面力仪(SFA)测量了浸在浓NaCl溶液中的两个分子光滑云母片之间的力作为距离的函数。在0.1 M溶液中,远程力与DLVO力没有偏差,而在短距离时,实验与理论的差异可以通过引入水合力来解释。拟合的表面电位Ψd与离子交换模型预测一致,该模型通过将云母表面的扩散层移动一直径的水合离子来预测。在较浓的溶液中,测量结果表明形成了一个额外的扩散层。这里,意想不到的现象的原因是由于考虑到共生离子的生长和过度吸附的影响,导致Na+和Cl−在界面上交替分层分布。因此,在密闭空间条件下,凝固区域更容易形成,特别是在高浓度的3m和5m溶液中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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