Effects of Weak Electrolytes on Electric Double Layer Ion Distributions

被引:18
|
作者
Chamberlayne, Christian F. [1 ]
Zare, Richard N. [1 ]
Santiago, Juan G. [2 ]
机构
[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA
[2] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2020年 / 11卷 / 19期
基金
美国国家卫生研究院;
关键词
D O I
10.1021/acs.jpclett.0c02247
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
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收藏
页码:8302 / 8306
页数:5
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