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Exploration of crossover criticality in an aqueous electrolyte solution

Jacob, J and Bagch, D and Kumar, A and Oswal, SL (2003) Exploration of crossover criticality in an aqueous electrolyte solution. In: Physica A: Statistical Mechanics and its Applications, 318 (1-2). pp. 101-112.

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The light scattering measurements that yield the osmotic susceptibility (chi(T)) in a ternary liquid mixture of 3-methylpyridine + water + sodium bromide are presented. The measurements have been performed in the one-phase region near the lower consolute points T-L's of samples with different concentrations (X) of NaBr. The data analysis has been performed by incorporating both one and ntwo correction-to-scaling terms. Results indicate that for large concentrations of NaBr, two correction-to-scaling terms are necessary for a proper description of the data. Moreover, it is observed that the amplitude of the first correction-to-scaling term (chi(1)) is negative for all the cases studied. These results are interpreted as a nonmonotonic crossover of the effective susceptibility exponent, gamma(eff), from its Ising value of 1.24 to the mean-field value of 1.00, when moving away from a given T-L. Investigations on the existence of an additional length scale in this mixture, using excess molar volume measurements, are also reported.

Item Type: Journal Article
Publication: Physica A: Statistical Mechanics and its Applications
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Equilibrium critical phenomena;Critical exponents; Multicritical point.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Jul 2009 06:11
Last Modified: 19 Sep 2010 04:54
URI: http://eprints.iisc.ac.in/id/eprint/16923

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