Title: Dielectric constant of fluids and fluid mixtures at criticality
Authors: Losada-Pérez, Patricia ×
Pérez-Sánchez, Germán
Cerdeirina, Claudio A ×
Thoen, Jan #
Issue Date: Apr-2010
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review E, Statistical, Nonlinear and Soft Matter Physics vol:81 issue:4
Article number: 041121
Abstract: The behavior of the dielectric constant epsilon of pure fluids and binary mixtures near liquid-gas and liquid-liquid critical points is studied within the concept of complete scaling of asymmetric fluid-fluid criticality. While mixing of the electric field into the scaling fields plays a role, pressure mixing is crucial as the asymptotic behavior of the coexistence-curve diameter in the epsilon-T plane is concerned. Specifically, it is found that the diameters, characterized by a vertical bar T-T-c vertical bar(1-alpha) singularity in the previous scaling formulation [J.V. Sengers, D. Bedeaux, P. Mazur, and S. C. Greer, Physica A 104, 573 (1980)], gain a more dominant vertical bar T-T-c vertical bar(2 beta) term, whose existence is shown to be supported by literature experimental data. The widely known vertical bar T-T-c vertical bar(1-alpha) singularity of epsilon along the critical isopleth in the one-phase region is found to provide information on the effect of electric fields on the liquid-liquid critical temperature: from experimental data it is inferred that T-c usually decreases as the magnitude of the electric field is enhanced. Furthermore, the behavior of mixtures along an isothermal path of approach to criticality is also analyzed: theory explains why the observed anomalies are remarkably higher than those associated to the usual isobaric path.
ISSN: 1539-3755
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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