Enhanced Ion Transport in 2-nm Silica Nanochannels

  • Chuanhua Duan
Conference paper
Part of the NATO Science for Peace and Security Series C: Environmental Security book series (NAPSC)


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.


Surface Charge Density Hydration Layer Proton Concentration Proton Mobility Debye Screening Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringBoston UniversityBostonUSA

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