Zhou Hao, Tilton Robert D, White Lee R
Department of Chemical Engineering, Center for Complex Fluids Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
J Colloid Interface Sci. 2006 May 15;297(2):819-31. doi: 10.1016/j.jcis.2005.11.024. Epub 2005 Dec 5.
Microelectromechanical systems (MEMS) employing spatially and/or temporally nonuniform electric fields have been extensively employed to control the motion of suspended particles or fluid flow. Design and control of microelectromechanical processes require accurate calculations of the electric field distribution under varying electrolyte conditions. Polarization of electrodes under the application of an oscillating voltage difference produces dynamic electrical double layers. The capacitive nature of the double layers significantly inhibits the penetration of the electric field through the double layer and into the surrounding bulk electrolyte at low frequencies. This paper quantitatively discusses the effect of electrode impedance on the electric field distribution as a function of field frequency, electrolyte composition, and electrode zeta potential in microelectrode systems. The design principles for the electrode geometry and configuration are also discussed in terms of their effects on the electric field magnitude and nonuniformity.
采用空间和/或时间上不均匀电场的微机电系统（MEMS）已被广泛用于控制悬浮颗粒的运动或流体流动。微机电过程的设计和控制需要在不同电解质条件下精确计算电场分布。在施加振荡电压差时电极的极化会产生动态电双层。双层的电容性质在低频时会显著抑制电场穿过双层并进入周围本体电解质。本文定量讨论了电极阻抗对微电极系统中电场分布的影响，该影响是场频率、电解质成分和电极zeta电位的函数。还从电极几何形状和配置对电场大小和不均匀性的影响方面讨论了设计原则。
