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TitleElectrical conductivity and permittivity measurements near the percolation transition in a microemulsion: I. Experiment
Publication TypeJournal Article
Year of Publication1988
AuthorsClarkson, M.T., and Smedley S.I.
JournalPhysical Review A
Pagination2070 - 2078
Date Published1988
ISSN10502947 (ISSN)
AbstractWe have made conductivity and permittivity measurements from 5"13 MHz on the microemulsion system toluene" brine "sodium-dodecyl-sulfate "butanol in the region where, by varying the brine salinity, the volume fraction of brine in the microemulsion varies from 0.1 to 0.9 as the system passes from one two-phase region to another via a three-phase region. In the two-phase region at high salinities, where the microemulsion consists of brine droplets dispersed in oil, a percolation transition, identified by a steep rise in the electrical conductivity, and a peak in the permittivity, is observed at brine volume fraction fp=0.130±0.001. This transition, although very close to the boundary between the two-phase and three-phase regions, clearly lies inside the two-phase region. The data also suggest that there is a discontinuity in the conductivity at the phase boundary, and we argue that the microemulsion undergoes a change in structure at the phase boundary. © 1988 The American Physical Society.

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