Communication: Virial coefficients and demixing in highly asymetric binary additive hard-sphere mixtures

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Communication: Virial coefficients and demixing in highly asymetric binary additive hard-sphere mixtures

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Title: Communication: Virial coefficients and demixing in highly asymetric binary additive hard-sphere mixtures
Author: López de Haro, Mariano; Fernández Tejero, Carlos; Santos Reyes, Andrés
Abstract: Se revisa el problema de la disgregación de una mezcla binaria fluida con aditivos altamente asimétricos de esferas duras. Se presenta una comparación entre los resultados previos obtenidos usando expansiones de viriales truncados para tres relaciones de tamaño finito; con ellos se obtiene el mismo enfoque en el caso extremo en el que uno de los componentes consiste en partículas puntuales. Dado que este último sistema es conocido por no exhibir la segregación de líquido fluido, la similitud observada en el comportamiento de las constantes críticas surgidas en la serie truncada en todos los casos, si bien no es concluyente, podrá emitir con serias dudas como la existencia real de un separador de mezclas en la transición de líquido a fluido es de tamaños dispares y de aditivos binarios en mezclas de esferas duras.The problem of demixing in a binary fluid mixture of highly asymmetric additive hard spheres is revisited. A comparison is presented between the results derived previously using truncated virial expansions for three finite size ratios with those that one obtains with the same approach in the extreme case in which one of the components consists of point particles. Since this latter system is known not to exhibit fluid-fluid segregation, the similarity observed for the behavior of the critical constants arising in the truncated series in all instances, while not being conclusive, may cast serious doubts as to the actual existence of a demixing fluid-fluid transition in disparate-sized binary additive hard-sphere mixtures.
Description: Publicado en: J. Chem. Phys. 138, 161104 (2013) DOI: 10.1063/1.4803097
URI: http://hdl.handle.net/10662/3378
Date: 2013-05


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