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On the derivations of the Debye–Hückel equations
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In this paper , the authors present the derivations of basic thermodynamic properties and activity coefficients equations from the linearised Poisson-Boltzmann equation, and demonstrate the necessary steps to reach all original models derived from the Debye-Hückel model and further explore their capabilities and limitations concerning individual ion and mean ionic activity coefficients for different size dissimilarities scenarios between ions.Abstract:
This work presents the derivations of basic thermodynamic properties and activity coefficients equations from the linearised Poisson–Boltzmann equation. We consider two main approaches, the first one is based in classical thermodynamics, which has been used in the original work of Debye and Hückel, leading to the model which has been an important cornerstone of electrolyte thermodynamics since its original publication in 1923. The second approach relies on more modern derivations based on statistical mechanics, the so-called charging approaches. Both derivation routes have differences and shortcomings. We demonstrate the necessary steps to reach all original models derived from the Debye–Hückel model and further explore their capabilities and limitations concerning individual ion, and mean ionic activity coefficients for different size dissimilarities scenarios between ions. One immediate conclusion is that there is an unnecessary consideration in the Debye and Hückel derivation which is cancelled by another one they have made, leading to a correct expression for the activity coefficient. Also, the long-lasting consideration that both the Debye and Güntelberg charging processes lead to the same thermodynamic properties is demonstrated to be inaccurate, as it is rigorously true only when a common distance of closest approach is used. GRAPHICAL ABSTRACTread more
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Investigation of the Limits of the Linearized Poisson-Boltzmann Equation.
TL;DR: In this article , a comparison between a numerical solution of the Poisson-Boltzmann equation and the analytical solution of its linearized version through the Debye-Hückel equations considering both size-dissimilar and common ion diameters approaches is presented.
Journal ArticleDOI
The true Hückel equation for electrolyte solutions and its relation with the Born term
TL;DR: In this article , the authors presented Hückel's original derivation and considerations, verifying the approximations that were done in his paper, and compared these equations to the original Debye-Hueckel equation.
Journal ArticleDOI
How to account for the concentration dependency of relative permittivity in the Debye-Hückel and Born equations
TL;DR: In this article , the authors discussed the impact of introducing the concentration dependency of relative permittivity in the context of activity coefficient models at different stages of the derivation of the models and showed that using concentration dependency as early as before deriving the Helmholtz free energy has the best overall performance.
Journal ArticleDOI
Ionization Difference between Weak and Strong Electrolytes as Perturbed by Conductivity Spectra Analysis.
TL;DR: In this article , the intrinsic short-lived ions of water, namely, excess protons (H3O+) and proton holes (OH-), were introduced into consideration and the model accounting for the neutralization of these ions by the species of electrolyte explains the conductivity of aqueous solutions.
Journal ArticleDOI
Resurrection of Hückel’s idea: Decoupling ion-ion and ion-water terms in activity coefficients via the state-dependent dielectric constant
Mónika Valiskó,Dezső Boda +1 more
TL;DR: Vincze et al. as mentioned in this paper proposed a decoupled II+IW theory that splits the excess chemical potential into two terms corresponding to interactions between ions (II) and interactions between ion and water (IW), which can be computed independently with ϵ(c) being the only link between them.
References
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Thermodynamics of electrolytes. V. Effects of higher-order electrostatic terms
TL;DR: The contribution of higher-order electrostatic terms (beyond the Debye-Huckel approximation) to the thermodynamic properties of mixed and pure electrolytes is investigated in this article.
Journal ArticleDOI
Modeling of aqueous electrolyte solutions with perturbed-chain statistical associated fluid theory
TL;DR: In this article, the vapor pressure and liquid densities of single-salt electrolyte solutions were modeled with an equation of state based on perturbed-chain statistical associated fluid theory (PC-SAFT).
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