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The transient electric current of surfactants dissolved in a nonpolar solventis investigated both experimentally and theoretically in the parallel-plategeometry. Due to a low concentration of free charges the cell can be completelypolarized by an external voltage of several volts. In this state, all thecharged micelles are compacted against the electrodes. After the voltage is setto zero the reverse current features a sharp discharge spike and a broad peak.This shape and its variation with the compacting voltage are reproduced in aone-dimensional drift-diffusion model. The model reveals the broad peak isformed by a competition between an increasing number of charges drifting backto the middle of the cell and a decreasing electric field that drives themotion. After complete polarization is achieved, the shape of the peak stopsevolving with further increase of the compacting voltage. The spike-peakseparation time grows logarithmically with the charge content in the bulk. Thetime peak is a useful measure of the micelle mobility. Time integration of thepeak yields the total charge in the system. By measuring its variation withtemperature, the activation energy of bulk charge generation has been found tobe 0.126 eV.

Transient electrophoretic current in a nonpolar solvent