Abstract
Highly viscous, optically isotropic water-in-oil microemulsion samples (dodecane, hexanol, potassium oleate plus water) with water content in the concentration interval 0.68≤C<0.8 (C, mass fraction) were studied by means of the thermally-stimulated-depolarization (TSD) method. Different polarizing temperatures were tested from 293 K down to 188 K. Depending on the polarizing temperature, the intensity of the static electric field was increased from 33 V/cm up to 10 kV/cm. The temperature dependence of the field-induced orientation processes was investigated and the activation energy and the relaxation time of the depolarization processes that were found to follow a first-order relaxation kinetic were evaluated. The temperature domain within which the viscous, isotopic mesophase may exist was also identified. The low-temperature TSD spectra of highly viscous, isotropic microemulsion samples are characterized by a current peak atT=198 K which follows a first-order kinetic and whose maximum current peak intensity is an inverse function of the polarizing temperature.
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