Monte Carlo simulations for the restricted primitive model of an electrolyte solution above the critical temperature are performed at a wide range of concentrations and temperatures. Thermodynamic properties such as internal energy, osmotic coefficient, activity coefficient, as well as spatial correlation functions are determined. These observables are used to investigate whether quasiuniversality in terms of an effective screening length exists, similar to the role played by the effective electron mass in solid-state physics. To that end, an effective screening length is extracted from the asymptotic behavior of the Fourier-transformed charge-correlation function and plugged into the Debye–Hückel limiting expressions for various thermodynamic properties. Comparison with numerical results is favorable, suggesting that correlation and other effects not captured on the Debye–Hückel limiting level can be successfully incorporated by a single effective parameter while keeping the functional form of Debye–Hückel expressions. We also compare different methods to determine mean ionic activity coefficient in molecular simulations and check the internal consistency of the numerical data.
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21 February 2009
Research Article|
February 17 2009
Effective screening length and quasiuniversality for the restricted primitive model of an electrolyte solution
Jiří Janeček;
Jiří Janeček
a)
1Institute of Physical and Applied Chemistry,
Brno University of Technology
, Purkyňova 118, 61200 Brno, Czech Republic
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Roland R. Netz
Roland R. Netz
2Department für Physik,
Technische Universität München
, 85748 Garching, Germany
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a)
Electronic mail: janecek@fch.vutbr.cz.
J. Chem. Phys. 130, 074502 (2009)
Article history
Received:
August 25 2008
Accepted:
December 08 2008
Citation
Jiří Janeček, Roland R. Netz; Effective screening length and quasiuniversality for the restricted primitive model of an electrolyte solution. J. Chem. Phys. 21 February 2009; 130 (7): 074502. https://doi.org/10.1063/1.3058777
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