Phase-separation transition in liquid mixtures near curved charged objects.


Marcus, G., Samin, S. & Tsori, Y. Phase-separation transition in liquid mixtures near curved charged objects. Journal of Chemical Physics 129, 6, 061101 - 4 (2008).
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We study the thermodynamic behavior of nonpolar liquid mixtures in the vicinity of curved charged objects, such as electrodes or charged colloids. There is a critical value of charge (or potential), above which a phase-separation transition occurs, and the interface between high- and low-dielectric constant components becomes sharp. Analytical and numerical composition profiles are given, and the equilibrium front location as a function of charge or voltage is found. We further employ a simple Cahn–Hilliard type equation to study the dynamics of phase separation in spatially nonuniform electric fields. We find an exponential temporal relaxation of the demixing front location. We give the dependence of the steady-state location and characteristic time on the charge, mixture composition and ambient temperature. [ABSTRACT FROM AUTHOR]


Accession Number: 34360348; Marcus, Gilad 1 Samin, Sela 2 Tsori, Yoav 2; Email Address:; Affiliation:  1: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany  2: Department of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel; Source Info: 8/14/2008, Vol. 129 Issue 6, p061101; Subject Term: THERMODYNAMICS; Subject Term: COLLOIDS; Subject Term: RELAXATION (Nuclear physics); Subject Term: ELECTRIC fields; Subject Term: THERMODYNAMIC equilibrium; Number of Pages: 4p; Illustrations: 5 Graphs; Document Type: Article


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