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Effects of Weak Electrolytes on Electric Double Layer Ion Distributions.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-09-11 , DOI: 10.1021/acs.jpclett.0c02247
Christian F Chamberlayne 1 , Richard N Zare 1 , Juan G Santiago 2
Affiliation  

Many common experimental systems have electric double layers containing weak electrolytes, including systems with buffers. The pH at the boundary of the diffuse layer is an important parameter for determining the physicochemical state of the system, including surface charge density. We show that the Boltzmann equilibrium relation can be used as an exact solution for weak electrolyte electric double layers. Using these results, we provide a closed-form relation for the maximum pH change in a buffered electric double layer, in terms of the boundary potential. Importantly, our results suggest that equilibrium electric double layer concepts developed for strong electrolytes can be expanded to include weak electrolytes.

中文翻译:

弱电解质对双电层离子分布的影响。

许多常见的实验系统都有包含弱电解质的双电层,包括带有缓冲液的系统。扩散层边界的pH是确定系统物理化学状态(包括表面电荷密度)的重要参数。我们表明,玻尔兹曼平衡关系可以用作弱电解质双电层的精确解。使用这些结果,我们就边界电势而言,为双电层的最大pH变化提供了一种封闭形式的关系。重要的是,我们的结果表明,针对强电解质开发的平衡双电层概念可以扩展为包括弱电解质。
更新日期:2020-10-02
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