Reversal current observed in micro-and submicro-channel flow under non-continuous DC electric field  

作　　者：段一飞 马宏伟 高泽阳 王凯歌 赵伟 孙聃 王归仁 李俊杰 白晋涛 顾长志 

机构地区：[1]State Key Laboratory of Cultivation Base for Photoelectric Technology and Functional Materials,Laboratory of Optoelectronic Technology of Shaanxi Province,National Center for International Research of Photoelectric Technology & Nanofunctional Materials and Application,Institute of Photonics and Photon-Technology,Northwest University [2]Mechanical Engineering Department & Biomedical Engineering Program,University of South Carolina [3]Laboratory of Microfabrication,Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2017年第6期481-490,共10页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61378083 and 11672229);the International Cooperation Foundation of the National Science and Technology Major Project of the Ministry of Science and Technology of China(Grant No.2011DFA12220);the Major Research Plan of the National Natural Science Foundation of China(Grant No.91123030);the Natural Science Foundation of Shaanxi Province of China(Grant Nos.2010JS110,14JS106,14JS107,and 2013SZS03-Z01);the Natural Science Basic Research Program of Shaanxi Province-Major Basic Research Project(Grant No.2016ZDJC-15)

摘　　要：In practical applications of biochips and bio-sensors, electrokinetic mechanisms are commonly employed to manipulate and analyze the characteristics of single bio-molecules. To accurately and flexibly control the movement of single molecule within micro-/submicro-fluidic channels, the characteristics of current signals at the initial stage of the flow are systematically studied based on a three-electrode system. The current response of micro-/submicro-fluidic channels filled with different electrolyte solutions in non-continuous external electric field are investigated. It is found, there always exists a current reversal phenomenon, which is an inherent property of the current signals in micro/submicro-fluidics Each solution has an individual critical voltage under which the steady current value is equal to zero The interaction between the steady current and external applied voltage follows an exponential function. All these results can be attributed to the overpotentials of the electric double layer on the electrodes. These results are helpful for the design and fabrication of functional micro/nano-scale fluidic sensors and biochips.In practical applications of biochips and bio-sensors, electrokinetic mechanisms are commonly employed to manipulate and analyze the characteristics of single bio-molecules. To accurately and flexibly control the movement of single molecule within micro-/submicro-fluidic channels, the characteristics of current signals at the initial stage of the flow are systematically studied based on a three-electrode system. The current response of micro-/submicro-fluidic channels filled with different electrolyte solutions in non-continuous external electric field are investigated. It is found, there always exists a current reversal phenomenon, which is an inherent property of the current signals in micro/submicro-fluidics Each solution has an individual critical voltage under which the steady current value is equal to zero The interaction between the steady current and external applied voltage follows an exponential function. All these results can be attributed to the overpotentials of the electric double layer on the electrodes. These results are helpful for the design and fabrication of functional micro/nano-scale fluidic sensors and biochips.

关 键 词：micro/nano-fluidic channel reversed-current phenomenon critical voltage steady current over-potential electric double layer 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]