Heat capacity anomalies along the critical isotherm in fluid-fluid phase transitions
authors Losada-Perez, P; Perez-Sanchez, G; Troncoso, J; Cerdeirina, CA
nationality International
journal JOURNAL OF CHEMICAL PHYSICS
author keywords critical points; density; heat of transformation; isothermal transformations; liquid-liquid transformations; organic compounds; specific heat; topology
keywords CRITICAL END-POINTS; LIQUID; THERMODYNAMICS; UNIVERSALITY
abstract The behavior of the isochoric heat capacity of pure fluids and the isobaric heat capacity at constant composition of binary mixtures along isothermal paths of approach to liquid-gas and liquid-liquid critical points is studied. From the complete scaling formulation of fluid-fluid criticality, explicit expressions for the critical amplitudes of the leading vertical bar Y-Y-c vertical bar(-alpha/beta) (where Y can be the density or the mole fraction) contributions are found to reveal previously discovered features of the scaling function, whereas the nature of the most important asymmetry-related terms is characterized. Data for pure toluene and for the binary mixture nitromethane-isobutanol are described within experimental uncertainty using the vertical bar Y-Y-c vertical bar(-alpha/beta) singularity plus a linear term. Extensive data for mixtures allow proper visualization of the topological features of the heat capacity-density-temperature surface in the critical region.
publisher AMER INST PHYSICS
issn 0021-9606
year published 2010
volume 132
issue 15
digital object identifier (doi) 10.1063/1.3374819
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000276971500031
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journal analysis (jcr 2017):
journal impact factor 2.843
5 year journal impact factor 2.743
category normalized journal impact factor percentile 60.149
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