The relaxation of the double layer around colloidal particles and the low-frequency dielectric dispersion: Part III. Application of theory to experiments

A theory for the dielectric relaxation of homodisperse colloids, derived in Part I of this series, has been applied to the experimental results reported in Part II. The main prediction of the theory, namely that double-layer polarization is dominated by that of the diffuse part of the double layer over that of the bound ions, has been confirmed both with respect to the relaxation time and the low-frequency dispersion. Quantitative agreement is obtained for the relaxation time but not for the dielectric increment. The reason for the discrepancy is probably a slight aggregation of the latex particles in addition to some peculiarities in the ion binding mechanisms.