关键词: 宽频介电谱, 紧密层, 表面电导率, Mathcad程序

On the basis of a thin double layer theory proposed by Shilov et al, the broadband dielectric spectroscopy of suspensions of non-conducting spherical particles including surface conductivity of the stagnant layer, the mechanisms of the two typical dielectric dispersions (high and low-frequency dielectric dispersion) was elucidated in an electrokinetic way. Based on the understanding above, the theory was programmed quantitatively by means of the Mathcad program, and the relationship between dielectric parameters and the inner phase parameters of particle/aqueous suspension was established. Then the influences of the inner phase parameters such as electrolyte concentration, Zeta potential and particle radius on both dispersions of non-conducting particle suspension were simulated through this program. Combining with the theory, the regular change of both dispersions under different conditions was interpreted in detail, which provided a valuable reference on better taking advantage of these dielectric dispersions to characterize the electrical properties of constituent phases and interfaces of suspensions of spherical particles with radii ranging from nanometer to millimeter.

Key words: broadband dielectric spectroscopy, stagnant layer, surface conductivity, Mathcad program