title: Interplay between Nanochannel and Microchannel Resistances.
abstract: 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.
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology , Technion City 32000, Israel.
authors.forename: Yoav
authors.initials: Y
authors.lastname: Green
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology , Technion City 32000, Israel.
authors.forename: Ran
authors.initials: R
authors.lastname: Eshel
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology , Technion City 32000, Israel.
authors.forename: Sinwook
authors.initials: S
authors.lastname: Park
authors.affiliation: Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory, Technion-Israel Institute of Technology , Technion City 32000, Israel.
authors.forename: Gilad
authors.initials: G
authors.lastname: Yossifon
keywords: Nanofluidics; concentration polarization; electrokinetics; fluid-based circuits