Dielectric constant of fluids and fluid mixtures at criticality
authors Losada-Perez, P; Perez-Sanchez, G; Cerdeirina, CA; Thoen, J
nationality International
journal PHYSICAL REVIEW E
keywords CRITICAL SOLUTION POINT; COEXISTENCE-CURVE DIAMETERS; CRITICAL CONSOLUTE POINT; BINARY-LIQUID MIXTURES; VAPOR CRITICAL-POINT; CRITICAL END-POINTS; HEAT-CAPACITY; ELECTRIC-FIELD; CRITICAL-BEHAVIOR; NITROETHANE-CYCLOHEXANE
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.
publisher AMER PHYSICAL SOC
issn 2470-0045
year published 2010
volume 81
issue 4
digital object identifier (doi) 10.1103/PhysRevE.81.041121
web of science category Physics, Fluids & Plasmas; Physics, Mathematical
subject category Physics
unique article identifier WOS:000277265700029
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journal analysis (jcr 2017):
journal impact factor 2.284
5 year journal impact factor 2.293
category normalized journal impact factor percentile 75.543
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