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

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 characteristic...

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Published inChinese physics B Vol. 26; no. 6; pp. 481 - 490
Main Author 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
Format Journal Article
LanguageEnglish
Published 01.06.2017
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/26/6/068203

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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.
AbstractList 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.
Author 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
AuthorAffiliation 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 Mechanical Engineering Department ＆ Biomedical Engineering Program, University of South Carolina, Columbia SC 29208, USA Laboratory of Microfabrication, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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Notes Yi-fei Duan1, Hong-wei Ma1, Ze-yang Gao1, Kai-ge Wang1, Wei Zhao1,2, Dan Sun1, Gui-ren Wang2, Jun-jie Li3, Jin-tao Bai1,Chang-zhi Gu3 （ 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 ;2Mechanical Engineering Department ＆ Biomedical Engineering Program, University of South Carolina, Columbia SC 29208, USA ; 3Laboratory of Microfabrication, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China）
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.
micro/nano-fluidic channel, reversed-current phenomenon, critical voltage, steady current, over-potential, electric double layer
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