Dielectric relaxation study of oil-continuous microemulsion systems

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Abstract
Extensive dielectric measurements in the frequency range 100 kHz–15 GHz have been performed at 25 °C on two oil-continuous microemulsion systems composed of water, n-dodecane, 1-pentanol, sodium dodecylsulfate and water, toluene, 1-butanol, sodium dodecylsulfate. It was found that in the above mentioned systems, the micellar phases display broad dielectric relaxation spectra which imply different dielectric processes. Two processes, occurring in the low frequency region around 1 and 100 MHz seem to be of ionic origin. They can be attributed to Maxwell–Wagner effect for heterogenous systems and the counterion movement in the interfacial layer around the micelles. The relaxation observed in the high frequency range (1 GHz) could possibly be attributed to the presence of water and alcohol in the vicinity of the reverse micellar surface. The strength of the dielectric relaxation process in the very high frequency region of about 16 GHz is dependent on the water content and is possibly related to pure water outside the interfacial layer.

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