Domains of phase separation in a charged colloidal dispersion driven by electrolytes

G. F. Wang, S. K. Lai

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We put forth the idea of treating coexisting phases as a composite system and express its free energy as the average of its constitutent free energies weighted by their respective volume proportions. As a result, the theoretical study of charged colloidal phase separation in the presence of electrolytes reduces to optimizing solely the entities pertaining to colloids and small ions. As concrete illustrations, we demarcated the boundaries of coexisting phases for the simplest colloidal dispersion driven by salts at moderate to high concentrations and compared the results with those obtained in the usual manner to numerically show the robust efficiency of the present theory. Also, for a charged colloidal dispersion at very low ionic strength, we crosshatched both the homogeneous one phase and coexisting phases, and used the domains of coexisting phases to interpret an anomalous “transition” of phase diagrams exhibited in dilute colloidal dispersions induced by salts on dilution.

Original languageEnglish
Pages (from-to)7
Number of pages1
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume70
Issue number5
DOIs
StatePublished - 2004

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