亚微米/纳米通道电渗流及控制  

Electro-osmotic flow and control in submicro/nano-fluidic channel

作　　者：龚磊[1] 吴健康[1] 王蕾[1] 晁侃[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2008年第9期48-51,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10472036)

摘　　要：通过联立分析双电层泊松-玻兹曼方程、液体流动纳维-斯托克斯方程,以及外加基电压-通道-液体耦合系统电场方程,获得了外加基电压调控下的亚微米/纳米通道电渗流的解析解.分析了固-液界面Zeta电位随外加基电压的响应,得到电渗流速度与外加基电压的关系特性.进一步研究了控制外加基电压以控制电渗流的方法,实时调控电渗流以满足增大输送的溶液流量、反向流动、多溶液混合等输送要求.An analytical solution is proposed for electro-osmotic flow modulated by externally applied transverse bias voltage in submicro/nano-fluidic channel by solving Navier-Stokes equation, PoissonBoltzmann equation and electric field equation of the entire couple system. The results indicate that the electro-osmotic solution based on weak overlap approximation of the electric double layer is suitable for flow in submicro/nano channel. The effect of externally applied transverse bias voltage on Zeta potential of the wall surface was also investigated. The relationship expression between the voltage bias and velocity in the channel is presented. Typical electro-osmotic flow controlling methods were carried out by simply changing the externally applied voltage bias on the channel wall.

关 键 词：电渗流 双电层 亚微米/纳米通道 基电压 ZETA电位 

分 类 号：O363[理学—流体力学]