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Titolo:
The critical locus of a simple fluid with added salt
Autore:
Kim, YC; Fisher, ME;
Indirizzi:
Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 & Technol, College Pk, MD 20742 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 47, volume: 105, anno: 2001,
pagine: 11785 - 11795
SICI:
1520-6106(20011129)105:47<11785:TCLOAS>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEBYE-HUCKEL THEORY; CRITICAL END-POINTS; SPHERE IONIC FLUID; PHASE-EQUILIBRIA; SODIUM-CHLORIDE; CORRELATION LENGTHS; CRITICAL-BEHAVIOR; AQUEOUS-SOLUTIONS; CRITICAL LINES; LENNARD-JONES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Fisher, ME Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 College Pk, MD 20742 USA
Citazione:
Y.C. Kim e M.E. Fisher, "The critical locus of a simple fluid with added salt", J PHYS CH B, 105(47), 2001, pp. 11785-11795

Abstract

A single-component, nonionic fluid that exhibits a standard gas-liquid critical point is considered under the addition of a salt at concentration phi. The critical loci, T-c(phi), p(c)(phi), and p(c)(phi) are studied perturbatively. Since the Debye screening length, xi (D), diverges as phi (-1/2) in the pure-fluid limit, singular behavior of the critical loci is to be expected when phi -->0. Using classical (i.e., van der Waals-type) theory for the solvent+ion mixture combined with Debye-Hackel theory for the ionic interactions, we find a phi (3/2) dependence of the critical loci so that, e.g., (d(2)T(c)/d phi (2)) diverges when phi --> 0. After extending the theoryto allow for ion pairing, experimental data for T-c(phi) for solutions of sodium chloride in water are analyzed and found to support a phi (3/2) anomaly of the predicted magnitude and sign. The latter turns out to be a consequence of the density dependence of the dielectric constant of pure water.

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Documento generato il 04/04/20 alle ore 21:53:06