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Interplay between Nanochannel and Microchannel Resistances

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Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion−Israel Institute of Technology, Technion City 32000, Israel
*(Y.G.) E-mail: [email protected]
*(G.Y.) E-mail: [email protected]
Cite this: Nano Lett. 2016, 16, 4, 2744–2748
Publication Date (Web):March 9, 2016
Copyright © 2016 American Chemical Society

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    Current nanochannel system paradigm commonly neglects the role of the interfacing microchannels and assumes that the ohmic electrical response of a microchannel–nanochannel system is solely determined by the geometric properties of the nanochannel. In this work, we demonstrate that the overall response is determined by the interplay between the nanochannel resistance and various microchannel attributed resistances. Our experiments confirm a recent theoretical prediction that in contrast to what was previously assumed at very low concentrations the role of the interfacing microchannels on the overall resistance becomes increasingly important. We argue that the current nanochannel-dominated conductance paradigm can be replaced with a more correct and intuitive microchannel–nanochannel-resistance-model-based paradigm.

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