Abstract
The dielectric behavior of suspensions of polystyrene/zinc oxide (PS/ZnO) composite particles in aqueous and electrolyte solution have been investigated by dielectric relaxation spectroscopy (DRS) in the frequency range from 40 Hz to 110 MHz. Two relaxations were confirmed by means of the logarithmic derivative method in this frequency range, which turned out to be very effective in resolving overlapped relaxations. The effects of volume fraction and the electrolyte concentration of composite particles on the dielectric response of suspensions were examined in detail, respectively. According to dielectric analysis, we found an abnormal and significative phenomenon, namely, special dielectric increments, where ∂el = (el − em)/φ and ∂eh = (em − eh)/φ denoting the low- and high-frequency relaxation amplitude of suspensions of PS/ZnO particles per unit volume, respectively, were increasing with the enhancement of volume fraction φ. On the basis of the combination of studying the dielectric parameters by fitti...
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