Effects of stern-layer conductance on electrokinetic transport properties of colloidal particles

摘要: The theory developed by O'Brien and White (R. W. L. R. White, J. Chem. Soc., Faraday Trans. 2, 1978, 77, 1607) to calculate the electrophoretic mobility of a solid, spherical colloidal particle, is reviewed extended.The equations governing ion distribution, electrostatic potential hydrodynamic flow field around are modified allow for lateral movement ions within Stern layer. Two classes Stern-layer adsorption isotherms considered: (1) onto available surface area; (2) underlying charge (C. F. Zukoski IV D. A. Saville, Colloid Interface Sci., 1986, 114, 32). model solved numerically both isotherms, effects varying individual parameters on conductivity increment, discussed compared with case when conductance absent.Regardless used, presence mobile causes decrease increase, in comparison conduction absent. magnitude this effect greater owing important contributions from coion counterion adsorption. Furthermore extra conditions density can lead negative site densities some positive zeta potentials ridiculously high at large or salt concentrations. In contrast, shows negligible modest throughout range concentration.A program calculating electrokinetic transport properties, including these models transport, authors.