Mean-field to Ising crossover in ionic fluids

Journal Article · Mon Nov 28 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.3002· OSTI ID:7065297

Narayanan, T; Pitzer, K S ^[1]

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1. Department of Chemistry and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

We present evidence for a classical to nonclassical [ital crossover], in the osmotic compressibility ([chi][sub [ital T]]) of model ionic fluids, as [ital T][sub [ital c]] is neared. [chi][sub [ital T]] was deduced from precision turbidity measurements. The phase separation in this class of ionic fluids is driven by the long-ranged Coulombic interactions. For a moderately Coulombic case, we observed a complete [ital crossover] from near Ising asymptotic behavior to a fully established mean-field character. Our results indicate that the crossover region shifts away from [ital T][sub [ital c]] as the Coulombic interactions are progressively lessened, by increasing the dielectric constant ([epsilon]) of the solvent.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7065297
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 73:22; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

661300* -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPRESSIBILITY
COULOMB FIELD
CRYSTAL MODELS
ELECTRIC FIELDS
FLUIDS
IONIZATION
ISING MODEL
MATHEMATICAL MODELS
MEAN-FIELD THEORY
MECHANICAL PROPERTIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TURBIDITY