Approximate analytic expression for the dynamic electrophoretic mobility of a spherical colloidal particle in an oscillating electric field.
An approximate analytic expression is derived for the dynamic electrophoretic mobility of a spherical charged colloidal particle in an electrolyte solution in an applied oscillating electric field. This expression, which takes into account the relaxation effects, is applicable for all values of zeta potential at large kappa a (kappa a > or = ca. 30) and omega/2pi < or = ca. 10 MHz, where kappa is the Debye-Hückel parameter, a is the particle radius, and omega is the frequency of the electric field. It is shown that the obtained mobility expression is in excellent agreement with the exact numerical results of Mangelsdorf and White (J. Chem. Soc., Faraday Trans. 1992, 88, 3567).
Ohshima
Hiroyuki
H
Faculty of Pharmaceutical Sciences and Institute of Colloid and Interface Science, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. ohshima@rs.noda.tus.ac.jp
D003102:Colloids / Q000737:chemistry*; D004560:Electricity; D004563:Electrochemistry / Q000379:methods; D004573:Electrolytes / Q000737:chemistry*; D004586:Electrophoresis; D007700:Kinetics; D015233:Models, Statistical; D008962:Models, Theoretical; D009991:Oscillometry / Q000379:methods*; D016012:Poisson Distribution; D013499:Surface Properties; D013696:Temperature
D003102:Colloids; D004573:Electrolytes