Abstract
In this paper, we contribute new data on the dielectric dispersion of suspensions of two kinds of spheroidal hematite particles (α-Fe2O3). One of the samples consisted of nearly spherical particles, and the other included almost spindle-like particles. We intended to demonstrate the unique potential applications of dielectric dispersion measurements on the characterization of the electrical double layer of nonspherical particles. Thus, we show that while the electrophoretic velocity is practically the same for both systems, the dielectric spectra differ very significantly from each other. In addition to analyzing the role of axial ratios on the electrokinetic behavior, we have also focused on the effect of pH and of the frequency range in which experiments are performed. Thus, two relaxations can be identified in the suspensions: the so-called α-relaxation (typically in the kilohertz region), related to the polarization of the electrical double layer, and the Maxwell−Wagner−O'Konski relaxation (of the or...
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