中国物理B ›› 2017, Vol. 26 ›› Issue (6): 68203-068203.doi: 10.1088/1674-1056/26/6/068203

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

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

Yi-fei Duan(段一飞), Hong-wei Ma(马宏伟), Ze-yang Gao(高泽阳), Kai-ge Wang(王凯歌), Wei Zhao(赵伟), Dan Sun(孙聃), Gui-ren Wang(王归仁), Jun-jie Li(李俊杰), Jin-tao Bai(白晋涛), Chang-zhi Gu(顾长志)   

  1. 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, Xi'an 710069, China;
    2 Mechanical Engineering Department & Biomedical Engineering Program, University of South Carolina, Columbia SC 29208, USA;
    3 Laboratory of Microfabrication, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2016-11-25 修回日期:2017-04-14 出版日期:2017-06-05 发布日期:2017-06-05
  • 通讯作者: Kai-ge Wang E-mail:wangkg@nwu.edu.cn
  • 基金资助:
    Project 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), and the Natural Science Basic Research Program of Shaanxi Province-Major Basic Research Project (Grant No. 2016ZDJC-15).

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

Yi-fei Duan(段一飞)1, Hong-wei Ma(马宏伟)1, Ze-yang Gao(高泽阳)1, Kai-ge Wang(王凯歌)1, Wei Zhao(赵伟)1,2, Dan Sun(孙聃)1, Gui-ren Wang(王归仁)2, Jun-jie Li(李俊杰)3, Jin-tao Bai(白晋涛)1, Chang-zhi Gu(顾长志)3   

  1. 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, Xi'an 710069, China;
    2 Mechanical Engineering Department & Biomedical Engineering Program, University of South Carolina, Columbia SC 29208, USA;
    3 Laboratory of Microfabrication, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2016-11-25 Revised:2017-04-14 Online:2017-06-05 Published:2017-06-05
  • Contact: Kai-ge Wang E-mail:wangkg@nwu.edu.cn
  • Supported by:
    Project 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), and 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.

关键词: micro/nano-fluidic channel, reversed-current phenomenon, critical voltage, steady current, overpotential, electric double layer

Abstract: 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.

Key words: micro/nano-fluidic channel, reversed-current phenomenon, critical voltage, steady current, overpotential, electric double layer

中图分类号:  (Electrochemistry and electrophoresis)

  • 82.45.-h
73.30.+y (Surface double layers, Schottky barriers, and work functions)