Dielectric spectroscopy was performed to study fluorinated water-in-oil microemulsions with perfluoropolyether surfactant and oil. The phase diagram experimental path, with a water to surfactant molar ratio equal to 11, was chosen as the most suitable for detecting a percolation phenomenon that occurs in the system. The study of the percolation phenomenon as a function of temperature was presented in Phys. Rev. E $50$, 1313 (1994). In this work, the concentration dependence of both the static dielectric constant and Ohmic conductivity, as well as the frequency dependence of the complex dielectric constant, are reported. The results show that the percolation is dynamic throughout both the composition and the temperature range in which the samples are monophasic.

• Received 10 February 1997

DOI:https://doi.org/10.1103/PhysRevE.56.4356