Critical behavior of ionic fluids

Journal Article · Thu Sep 15 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100088a014· OSTI ID:7070252

Narayanan, T; Pitzer, K S ^[1]

---

1. Lawrence Berkeley Lab., CA (United States)

We report the critical behavior of osmotic compressibility ([chi]T) that was deduced from turbidity, for two ionic fluid mixtures. The measurements covered the reduced temperature, t, range 7 x 10[sup [minus]5] [le] t [le] 7 x 10[sup [minus]2]. The mechanism underlying the liquid-liquid phase separations, predominantly, Coulombic in one case and solvophobic for the other. We find that the criticality of Coulombic phase separation is better described in terms of a crossover from mean field to Ising critical exponents, rather than true mean field exponents, as the critical temperature (T[sub c]) is approached. In addition, we find that the critical phenomenon associated with the solvophobic phase separation in an ionic fluid is characterized by nonclassical critical exponents. 24 refs., 3 figs., 3 tabs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7070252
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:37; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALCOHOLS
AMMONIUM COMPOUNDS
BUTANEDIOLS
COMPILED DATA
CRITICAL TEMPERATURE
DATA
DISPERSIONS
FLUIDS
GLYCOLS
HYDROXY COMPOUNDS
INFORMATION
LASERS
MATHEMATICAL MODELS
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
SALTS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TURBIDITY