Novel electrochemical flow sensor based on sensing the convective-diffusive ionic concentration layer

Sinwook Park, Ramadan Abu-Rjal, Leon Rosentsvit, Gilad Yossifon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Presented is a novel flow sensor based on electrochemical sensing of the ionic concentration-polarization (CP) layer developed within a microchannel-ion permselective membrane device. To demonstrate the working principle of the electrochemical flow sensor, the effect of advection on the transient and steady-state ionic concentration-polarization (CP) phenomenon in microchannel-Nafion membrane systems is studied. In particular, we focused on the local impedance, measured using an array of electrode pairs embedded at the bottom of the microchannel, as well as the total current across the permselective medium, as two approaches for estimating the flow. We examined both a stepwise application of CP under steady-state flow and a stepwise application of flow under steady-state CP.

Original languageEnglish
Pages (from-to)1806-1815
Number of pages10
JournalACS Sensors
Volume4
Issue number7
DOIs
StatePublished - 26 Jul 2019
Externally publishedYes

Funding

FundersFunder number
Micro-Nano Fabrication Unit
Israel Science Foundation1938/16
Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology

    Keywords

    • flow sensor
    • ionic concentration-polarization
    • local impedance
    • microchannel-membrane device
    • perm-selective membrane

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