Electrostatics of Phase Boundaries in Coulomb systems
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
Any interface boundary in an equilibrium system of Coulomb particles is accompanied by the existence of a finite difference in the average electrostatic potential through this boundary. The discussed interface potential drop is a thermodynamic quantity. It depends on temperature only and does not depend on surface properties. The zero-temperature limit of this drop (along the coexistence curve) is an individual substance coefficient. At high temperature the drop tends to zero at critical point of gasliquid phase transition. A special critical exponent can be defined to describe this behavior. Study of the interface potential drop is illuminative in simplified Coulomb models: i.e. for melting and evaporation in variants of One Component Plasma model (OCP), or for model of Charged Hard/Soft Spheres (CHS/CSS) etc. In all these cases properties of the potential drop can be easily calculated by the DNS methods (direct numerical simulation) when the two-phase coexistence in Coulomb system is really simulated. Electrostatics of phase boundaries in real systems could be elucidated in analytical calculation of two-phase coexistence via finite-temperature DFT approach (density functional theory).
4 pages, 1 figure, Proceedings of 30th EPS Conference on Contr. Fusion and Plasma Phys., St. Petersburg, 7-11 July 2003
4 pages, 1 figure, Proceedings of 30th EPS Conference on Contr. Fusion and Plasma Phys., St. Petersburg, 7-11 July 2003