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Enhanced Ion Transport in 2-nm Silica Nanochannels

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Transport and Reactivity of Solutions in Confined Hydrosystems

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Abstract

Fluidic nanochannels with 1–2 nm in size are functional mimics of protein channels, and have recently attracted significant attention for exploring the transport of ions and molecules in confined liquids. Here we report ion transport in 2 nm deep nanochannels fabricated by standard semiconductor manufacturing processes. Ion transport in these nanochannels is dominated by surface charge until the ion concentration exceeds 100 mM. At low concentrations, proton mobility increases by a factor of four over its bulk value, possibly due to overlap of the two hydration layers adjacent to hydrophilic surfaces. The mobility of K+/Na + ions also increases as the bulk concentration decreases, although the reasons are not completely understood.

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Note: This work is a revision of a previous paper titled “Anomalous ion transport in 2-nm hydrophilic nanochannels”, which has been published in Nature Nanotechnology 5, 848–852, 2010.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Boston University, 110 Cummington Street, Boston, MA, 02215, USA

    Chuanhua Duan

Authors
  1. Chuanhua Duan
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Correspondence to Chuanhua Duan .

Editor information

Editors and Affiliations

  1. Institute of Earth Sciences, University of Orléans, Orléans, France

    Lionel Mercury

  2. Department of Transducers Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands

    Niels Tas

  3. The Hydrological Service; Research Division, Israeli Water Authority, Jerusalem, Israel

    Michael Zilberbrand

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Duan, C. (2014). Enhanced Ion Transport in 2-nm Silica Nanochannels. In: Mercury, L., Tas, N., Zilberbrand, M. (eds) Transport and Reactivity of Solutions in Confined Hydrosystems. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7534-3_7

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