Electrical conductivity of reverse micelles in supercritical carbon dioxide

Abstract

The conductivity of water/ClPFPE-NH₄/scCO₂ systems is studied over a wide range of pressures and droplet volume fractions at 35 °C and at two constant water-to-surfactant molar ratios, W₀ = 10.3 and 18.7, respectively. The results are interpreted according to three different models for low, intermediate and high concentrations of water and surfactant. Information is obtained about a possible bulk-like behaviour of water, about the approximate size of the micelles, about micellar percolation, and about changes of CO₂–water droplet interactions with pressure.