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Novel Electrochemical Flow Sensor Based on Sensing the Convective-Diffusive Ionic Concentration Layer.

Sinwook Park¹, Ramadan Abu-Rjal¹, Leon Rosentsvit¹

¹Faculty of Mechanical Engineering, Micro- and Nanofluidics Laboratory , Technion - Israel Institute of Technology , Technion City 3200000 , Israel.

|June 18, 2019

Summary

This summary is machine-generated.

This study introduces a novel electrochemical flow sensor utilizing ionic concentration-polarization (CP) layers in microchannels. The sensor effectively estimates fluid flow by measuring electrical properties within the device.

Keywords:

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

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Area of Science:

Electrochemistry
Microfluidics
Sensor Technology

Background:

Ionic concentration-polarization (CP) is a key phenomenon in microchannel-ion permselective membrane systems.
Understanding the influence of advection on CP is crucial for developing advanced sensing technologies.

Purpose of the Study:

To present a novel flow sensor based on electrochemical sensing of the CP layer.
To investigate the effect of advection on transient and steady-state CP phenomena in microchannel-Nafion membrane systems.
To explore two distinct methods for flow estimation using this sensor.

Main Methods:

Development of a microchannel-ion permselective membrane device for electrochemical sensing.
Measurement of local impedance using embedded electrode pairs.
Monitoring of total current across the permselective medium.
Examination of stepwise CP application under steady-state flow and stepwise flow under steady-state CP.

Main Results:

Demonstrated the working principle of the electrochemical flow sensor.
Quantified the effect of advection on the ionic CP layer.
Validated local impedance and total current as effective parameters for flow estimation.

Conclusions:

The novel electrochemical sensor shows promise for accurate fluid flow measurement.
The study provides insights into the interplay between advection and ionic CP in microfluidic devices.
This technology offers a new approach for microflow sensing applications.