Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster II
DY 29.37: Poster
Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C
Liquid interfaces in Ising fluids — •Wolfgang Fenz1, Igor Omelyan1,2, Reinhard Folk1, and Igor Mryglod1,2 — 1Institute for Theoretical Physics, Linz University, A-4040 Linz, Austria — 2Institute for Condensed Matter Physics, 1 Svientsitskii Street, UA-79011 Lviv, Ukraine
We study the thermodynamic properties and microscopic structure of liquid-liquid and liquid-vapor interfaces in Ising spin fluids by an integral equation approach. The coupled set of the Lovett-Mou-Buff-Wertheim equations for the inhomogeneous one-particle distribution functions and the Ornstein-Zernike equations for the bulk two-particle correlation functions complimented by the closure relation are solved using a modified soft mean spherical approximation. The two-particle inhomogeneous direct correlation functions are consistently constructed by nonlinear interpolation of the bulk ones corresponding to the coexisting phases. The density and magnetization profiles at the liquid-liquid and liquid-vapor interfaces are calculated in a wide range of temperatures including subcritical regions. The liquid-liquid adsorption coefficient and the liquid-vapor surface tension are evaluated as well. The influence of the external magnetic field on the structure of the liquid-vapor interfaces is also analyzed.
Supported by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung, project No. P18592.
[1] I. P. Omelyan, R. Folk, I. M. Mryglod, and W. Fenz, J. Chem. Phys. 126, 124702 (2007).