DYNAMIC PERCOLATION IN FLUORINATED WATER-IN-OIL MICROEMULSIONS

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