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Entropy 2018, 20(4), 250; https://doi.org/10.3390/e20040250

Fluid-Fluid Interfaces of Multi-Component Mixtures in Local Equilibrium

PoreLab, Department of Chemistry, Norwegian University of Science and Technology, 7491 Trondheim, Norway
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Received: 18 February 2018 / Revised: 20 March 2018 / Accepted: 3 April 2018 / Published: 4 April 2018
(This article belongs to the Special Issue Mesoscopic Thermodynamics and Dynamics)
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Abstract

We derive in a new way that the intensive properties of a fluid-fluid Gibbs interface are independent of the location of the dividing surface. When the system is out of global equilibrium, this finding is not trivial: In a one-component fluid, it can be used to obtain the interface temperature from the surface tension. In other words, the surface equation of state can serve as a thermometer for the liquid-vapor interface in a one-component fluid. In a multi-component fluid, one needs the surface tension and the relative adsorptions to obtain the interface temperature and chemical potentials. A consistent set of thermodynamic properties of multi-component surfaces are presented. They can be used to construct fluid-fluid boundary conditions during transport. These boundary conditions have a bearing on all thermodynamic modeling on transport related to phase transitions. View Full-Text
Keywords: Gibbs interface; surface equation of state; dividing interface; local equilibrium; dynamic boundary conditions; phase transition Gibbs interface; surface equation of state; dividing interface; local equilibrium; dynamic boundary conditions; phase transition
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Bedeaux, D.; Kjelstrup, S. Fluid-Fluid Interfaces of Multi-Component Mixtures in Local Equilibrium. Entropy 2018, 20, 250.

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