Calculation of the dynamic impedance of the double layer on a planar electrode by the theory of electrokinetics.
Applications of microelectromechanical systems in the biotechnological arena (bioMEMS) are a subject of great current interest. Accurate calculation of electric field distribution in these devices is essential to the understanding and design of processes such as dielectrophoresis and AC electroosmosis that drive MEMS-based devices. In this paper, we present the calculation of the electrical double-layer impedance (Z(el)) of an ideally polarizable plane electrode using the standard model of colloidal electrokinetics. The frequency variation of the electrical potential drop across the double layer above a planar electrode in a general electrolyte solution is discussed as a function of the electrode zeta potential zeta, the Debye length kappa(-1), the electrolyte composition and the bulk region thickness L.
Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Hao
H
Zhou
Matthew A
MA
Preston
Robert D
RD
Tilton
Lee R
LR
White
D003102:Colloids / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D004573:Electrolytes; D055590:Electromagnetic Phenomena; D007700:Kinetics; D008956:Models, Chemical; D012996:Solutions / Q000737:chemistry
D003102:Colloids; D004573:Electrolytes; D012996:Solutions