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Bilayer Microfluidic Device for Combinatorial Plug Production

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Eletrochemically actuated stop-go valves for capillary force-operated diagnostic microsystems.

Alemayehu P Washe¹, Pablo Lozano, Diego Bejarano

¹Bioengineering and Bioelectrochemistry Group, Department of Chemical Engineering, Universitat Rovira i Virgili, Avinguda Països Catalans, 26, 43007, Tarragona, Spain.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|April 18, 2013

Summary

Electrochemically activated valves control fluid flow in microchannels without moving parts. This innovation enhances analytical microdevices by enabling simple, low-voltage operation for capillary-driven systems.

Keywords:

electrochemistry graphite ion effects microsystems stop-go valve

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Area of Science:

Microfluidics
Analytical Chemistry
Materials Science

Background:

Lateral-flow immunosensing devices are successful analytical microdevices due to simple, capillary-driven flow.
Further advancements require simple fluid manipulation in microscale systems.

Purpose of the Study:

To demonstrate electrochemically activated valves for manipulating capillary-driven flow in microchannels.
To develop a simple-to-operate fluid control mechanism for microanalytical devices.

Main Methods:

Utilized screen-printed electrode pairs transversal to microchannels.
Incorporated a superhydrophobic surface on one electrode via solvent-etching.
Employed electrowetting for low-voltage (~1 V) flow actuation.

Main Results:

Successfully demonstrated electrochemically activated valves in a stop-go mode.
Achieved response times between 2 and 45 seconds, dependent on salt type and concentration.
Identified electrocapillarity, double-layer capacitance, ion adsorption, and electrohydrodynamics as key response mechanisms.

Conclusions:

Electrochemical valves offer a viable, no-moving-parts solution for fluid control in microfluidic devices.
This technology can enhance the simplicity and performance of analytical microdevices, competing with existing lateral-flow systems.