Condensed Matter Physics, 2013, vol. 16, No. 4, 43607:1-10
DOI:10.5488/CMP.16.43607           arXiv:1312.4566

Title: Density anomaly of charged hard spheres of different diameters in a mixture with core-softened model solvent. Monte Carlo simulation results
  B. Hribar-Lee (Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva c. 5, SI-1000 Ljubljana, Slovenia) ,
  O. Pizio (Instituto de Quimica, Universidad Nacional Autonoma de Mexico, Circuito Exterior, 04510, Mexico, D.F., Mexico)

Very recently the effect of equisized charged hard sphere solutes in a mixture with core-softened fluid model on the structural and thermodynamic anomalies of the system has been explored in detail by using Monte Carlo simulations and integral equations theory (J. Chem. Phys., 137, 244502 (2012)). Our objective of the present short work is to complement this study by considering univalent ions of unequal diameters in a mixture with the same soft-core fluid model. Specifically, we are interested in the analysis of changes of the temperature of maximum density (TMD) lines with ion concentration for three model salt solutes, namely sodium chloride, potassium chloride and rubidium chloride models. We resort to Monte Carlo simulations for this purpose. Our discussion also involves the dependences of the pair contribution to excess entropy and of constant volume heat capacity on the temperature of maximum density line. Some examples of the microscopic structure of mixtures in question in terms of pair distributions functions are given in addition.

Key words: liquid theory, soft-core model fluid, electrolyte solution, canonical Monte Carlo simulations, density anomaly
PACS: 61.20.-p (61.20.Gy, 6120.Ja, 61.20.Ne, 61.20.Qg), 65.20.-w

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