Principles of surface potential estimation in mixed electrolyte solutions: Taking into account dielectric saturation

Zou, Wenxin; Peng, Jing; Xiu, Wei-ning; Liu, Xinmin

doi:10.1063/1674-0068/cjcp1907132

Cited by 1 publication

(1 citation statement)

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“…Previous studies have showed that monovalent cations such as Li + , Na + , and K + demonstrate strong specific ion effects on the kinetic stability of proteins (Broering and Bommarius, 2005), in ion exchange (Liu et al, 2013), under the influence of active energy in particle interaction . In addition, a principle of surface potential determination of the charged particles in mixed electrolyte solutions was established considering the dielectric saturation (Zou et al, 2020). According to the aforementioned analysis, we believe that it is necessary to consider the specific ion effects in the calculation of surface potential when the particles are in Li + , Na + , and K + solutions.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the surface potential of clay mineral taking Na+/K+-specific ion effects into account

Gao

Zhu²,

Zhang³

et al. 2022

Front. Mater.

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Surface potential is a key electrochemical property of colloids in the study of particle interactions. However, the specific ion effects are not involved in the existing measuring methods. In this study, approaches for the estimation of the surface potential of montmorillonite with or without consideration of the specific ion effects were explored through the montmorillonite particle aggregation in the presence of Li+, Na+, and K+ ions. The montmorillonite aggregation process exhibited remarkable specific ion effects, and the critical coagulation concentration (CCC) values show the following: Li+ (271.8 mm) > Na+ (130.8 mm) > K+ (85.04 mm). Based on the mathematic relationship between electrostatic repulsion and the van der Waals attractive interaction at the CCC, the fluctuation coefficient ß was obtained. The value of β could quantify the strength of the specific ion effects of different cations. Then, the fluctuation coefficient β was introduced into the classical method for calculating the surface potential, considering the specific ion effects. The quantificational sequence of the ionic specificity of K+ and Na+ was as follows: βK = 1.433 > βNa = 1.187. Simultaneously, the surface potential considering specific ion effects can be obtained by introducing this coefficient. Our findings provide ideas for getting reliable surface potentials of charged particles in different electrolyte environments.

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Section: Introductionmentioning

confidence: 99%