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Density, ultrasonic velocity, viscosity, and electrical conductance of water/AOT/n-heptane microemulsions as a function of the volume fraction of the dispersed phase (0 < Q < 70) and of the molar ratio water/AOT = R (0 < R < 40) have been measured at 25 O C . The density and the isentropic compressibility of the micellar phase are derived from the experimental data. The volumetric properties, at high R, exhibit a trend toward an enhanced water-like character of the dispersed phase. At low R there is evidence for a structural change in the hydrogen-bonded network of water filling the droplets. Electrical conductivity data show the existence of a percolation threshold depending on R. Below the percolation threshold, the specific conductance qualitatively and quantitatively agrees with the prediction of the droplet charge fluctuation model. Comparison of the viscosity and the electric conductance behavior with 4 indicates that the processes for momentum and charge transfer, even if related to the droplets cluster formation, are different.

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Data are reported on the conductances of dilute solutions of hydrogen chloride in wet ethanol and wet butan-2-01 at 25°C.From these and supplementary data in other homologous alcohols of the CnH2n+10H series the correlation between monomer concentration and proton limiting conducatance/viscosity product is discussed in terms of the structure of the solvent.

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