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Microfluidics and Nanofluidics

, Volume 18, Issue 5–6, pp 785–794 | Cite as

Ion transport and selection through DCGC-based electroosmosis in a conducting nanofluidic channel

  • Cunlu Zhao
  • Chun YangEmail author
Research Paper

Abstract

Compared to conventional electroosmosis over a non-polarizable insulating surface with fixed surface charge (or zeta potential), induced-charge electroosmosis occurs over an electrically polarizable surface with the ability of surface charge modulation (both magnitude and sign) under externally applied electric fields. Here, for the first time we propose to extend the induced-charge electroosmosis to nanofluidic channels with conducting (ideally polarizable) walls. Furthermore, we present a numerical model to describe the electrokinetic transport in such conducting nanofluidic channels. The analysis of numerical results shows new applications of induced-charge electroosmosis for actively tunable ion selection and flexible flow control in nanofluidics. This is achieved through the direct contact gate control (DCGC) of surface charge in induced-charge electroosmosis by applying very low voltages directly on conducting walls of nanochannels.

Keywords

Induced-charge electroosmosis Nanofluidic transport Ion selection Flow control 

Notes

Acknowledgments

This work was supported by the Ministry of Education of Singapore under Grant No. RG 93/14 to CY and ZCL would like to thank Nanyang Technological University for the Ph.D. research student scholarship.

Supplementary material

10404_2014_1471_MOESM1_ESM.docx (3.6 mb)
Supplementary material 1 (DOCX 3685 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingaporeRepublic of Singapore

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