GIANT DIELECTRIC RESPONSE OF THE SPONGE PHASE

Michael Cates, P VANDERSCHOOT, C Y D LU

Research output: Contribution to journalArticlepeer-review

Abstract

We consider a simple model for the dielectric response of a water-rich surfactant sponge phase (L3), in which an insulating bilayer separates two continuous brine domains (''in'' and ''out''). Experiments of Vinches, Coulon and Roux (J. Phys. II, 4 (1994) 1165) show for high salt concentrations a bimodal relaxation. We associate their higher-frequency mode with behaviour on the sale of a single pore of the sponge, and the lower-frequency one with fluctuations in the ''in/out'' order parameter. For a perfect bilayer, we predict a divergence of the real part of the relative permittivity at the in/out symmetry breaking transition. This is consistent with the extremely high values (epsilon congruent-to 10(7)) observed experimentally in some high salt samples.

Original languageEnglish
Pages (from-to)669-674
Number of pages6
JournalEurophysics Letters
Volume29
Issue number9
DOIs
Publication statusPublished - 20 Mar 1995

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