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Hofmeister effect for electrokinetic transport at ordered DNA layers

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Abstract

Development of DNA nanotechnology provides the basis to construct novel biomimetic DNA nanochannels. In this work, we report electrokinetic transport behavior of the fluid through the surfaces consisting of double-stranded DNA molecules based on all-atom molecular dynamics simulations. The results show that an electric double layer forms close to the DNA surface, and the fluid can be driven by an externally applied electric field. At large DNA–DNA separation, a velocity jump is observed when the electric field is exerted along the direction of the central axis of DNA. Increasing the DNA separation does not influence the flow velocity in the model parameters investigated. It was also found that the magnitude of electroosmotic flow velocity obeys the Hofmeister series.

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Acknowledgments

QC gratefully acknowledges support by the Alexander von Humboldt Foundation. This work was also supported by the National Natural Science Foundation of China under Grant No. 31500801.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Jiaxing University, Jiaxing, 314001, People’s Republic of China

    Qianqian Cao

  2. Fachbereich Physik, Freie Universität Berlin, 14195, Berlin, Germany

    Qianqian Cao

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  1. Qianqian Cao
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Correspondence to Qianqian Cao.

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Cao, Q. Hofmeister effect for electrokinetic transport at ordered DNA layers. Microfluid Nanofluid 20, 132 (2016). https://doi.org/10.1007/s10404-016-1797-z

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