Phase behavior of three-component ionic fluids

Details Phase behavior of three-component ionic fluids Phase behavior of three-component ionic fluids

2000-09-11

arxiv.org/abs/cond-mat/0009150v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures; to appear in the European Physical Journal D

Scientific paper

10.1007/s100530170287

We study the phase behavior of solutions consisting of positive and negative ions of valence z to which a third ionic species of valence Z>z is added. Using a discretized Debye-Hueckel theory, we analyze the phase behavior of such systems for different values of the ratio Z/z. We find, for Z/z>1.934, a three-phase coexistence region and, for Z/z>2, a closed (reentrant) coexistence loop at high temperatures. We characterize the behavior of these ternary ionic mixtures as function of charge asymmetry and temperature, and show the complete phase diagrams for the experimentally relevant cases of Z/z=2 and Z/z=3, corresponding to addition of divalent and trivalent ions to monovalent ionic fluids, respectively.

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