Phase Separation of Ionic Ferrofluids

A. O. Ivanov

Ural State University, pr. Lenina 51, Yekaterinburg, 620083 Russia

Received November 19, 1996

Abstract—A theoretical model describing concentration phase separation of ionic ferrofluids (IFFs) under the
effect of the excess electrolyte was constructed. The structure of the electrical double layers was determined in
terms of the Poisson–Boltzmann equation at the adsorption mechanism of the surface charge formation. Poly
dispersity of the ferrofluid was taken into account by a two-fraction approximation. Phase diagrams of a bidis
perse ionic ferrofluid were constructed, and parameters of coexisting phases were determined based on the anal
ysis of the conditions of thermodynamic stability.

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