DIELECTRIC RESPONSE OF A DILUTE SUSPENSION OF SPHERICAL COLLOIDAL PARTICLES TO AN OSCILLATING ELECTRIC-FIELD

The theory developed by Mangelsdorf and White (C. S. Mangelsdorf and L . R. White, J. Chem. Soc., Faraday Trans., 1992, 88, 3567) to calculat e the electrophoretic mobility of a solid, spherical colloidal particl e subjected to an oscillating electric field is extended to compute th e dielectric response and electrical conductivity of a dilute suspensi on of spherical colloidal particles in an oscillating electric field. The magnitude and phase of the dipole strength are displayed as functi ons of zeta potential, frequency, particle size and electrolyte concen tration. The numerical results are compared with the model of De Lacey and White (E. H. B. De Lacey and L. R. White, J. Chem. Soc., Faraday Trans. 2, 1981, 77, 2007) and the thin double layer theories developed by O'Brien (R. W. O'Brien, J. Colloid Interface Sci., 1986, 113, 81) and Hinch et al. (E. J. Hinch, J. D. Sherwood, W. C. Chew and P. N. Se n, J. Chem. Soc. Faraday Trans. 2, 1984, 80, 535). A program for calcu lating the dielectric response and other variable frequency transport properties, is available from the authors.