Charge Renormalization and Charge Oscillation in Asymmetric Primitive Model

19 Feb 2016  ·  Ding Mingnan Institute of Natural Sciences and Department of Physics and Astronomy, Shanghai Jiao Tong University, Liang Yihao Institute of Natural Sciences and Department of Physics and Astronomy, Shanghai Jiao Tong University, Lu Bing-Sui Institute of Natural Sciences and Department of Physics and Astronomy, Shanghai Jiao Tong University, Xing Xiangjun Institute of Natural Sciences and Department of Physics and Astronomy, Shanghai Jiao Tong University ·

The Debye charging method is generalized to study the linear response properties of the asymmetric primitive model for electrolytes. Analytic results are obtained for the effective charge distributions of constituent ions inside the electrolyte, from which all static linear response properties of system follow... It is found that, as the ion density increases, both the screening length and the dielectric constant receive substantial renormalization due to ionic correlations. Furthermore, the valence of larger ion is substantially renormalized upwards by ionic correlations, whilst that of smaller ions remains approximately the same. For sufficiently high density, the system exhibit charge oscillations. The threshold ion density for charge oscillation is much lower than the corresponding value for symmetric electrolytes. Our results agree well with large scale Monte Carlo simulations. read more

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Soft Condensed Matter Statistical Mechanics Chemical Physics