TITLE

Study of the electrical conductivity of four-component critical microemulsions

AUTHOR(S)

Rebbouh, N.; Hamelin, J.; Bose, T. K.; Thoen, J.

PUB. DATE

June 1992

SOURCE

Journal of Chemical Physics;6/1/1992, Vol. 96 Issue 11, p8470

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

Experimental data for the electric conductivity are reported for two microemulsions of n-dodecane, water, n-pentanol, and sodium dodecylsulfate with lower critical solution points along a critical line ending at a critical end point (CEP). One microemulsion (C) had a lower critical solution point (LCSP) close to the CEP. For the other microemulsion (A), the LCSP was away from the CEP. For a third microemulsion (D�) with a composition close to that of C, measurements were carried out near an upper critical solution point (UCSP) about 6 �C below the LCSP of sample C. For all three cases, an anomalous behavior was observed near the critical point. The anomaly for sample A can be well described in terms of a power law with Ising exponent values. This is not possible for sample C (near the CEP), where the anomalous behavior of s can be better described with an expression recently proposed by Rebbouh and Lalanne [J. Chem. Phys. 90, 1175 (1989)] on the basis of a microscopic model for the merging of dynamic clusters near the CEP. On the basis of our additional results for the microemulsion D�, we can find no evidence for the influence of critical fluctuations near the UCSP on the anomaly in s at the LCSP of sample C.

ACCESSION #

7614721

Tags: ELECTRIC conductivity;  EMULSIONS

 

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