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Water-oil core-shell droplets for electrowetting-based digital microfluidic devices.

Daniel Brassard¹, Lidija Malic, François Normandin

¹Industrial Materials Institute, National Research Council, Boucherville, QC, CanadaJ4B 6Y4.

|July 25, 2008

Summary

This study introduces a novel core-shell droplet manipulation method for electrowetting-on-dielectric (EWOD) digital microfluidic systems. This technique enhances droplet transport efficiency and reduces operational voltage compared to traditional methods.

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Area of Science:

Microfluidics
Surface Science
Electrical Engineering

Background:

Digital microfluidics utilizing electrowetting-on-dielectric (EWOD) offers flexible lab-on-a-chip solutions.
Traditional EWOD droplet manipulation in air or oil presents significant limitations for diverse applications.

Purpose of the Study:

To introduce and evaluate a novel core-shell droplet manipulation strategy for EWOD devices.
To compare the performance of core-shell droplets against traditional air and oil droplet manipulation methods.

Main Methods:

Development of EWOD devices capable of manipulating water-in-oil core-shell droplets in air.
Systematic comparison of fundamental fluidic operations (e.g., transport) using core-shell, air, and oil droplets.
Measurement and analysis of operational voltage and transport velocities.

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Main Results:

The core-shell configuration successfully enables on-chip manipulation of fundamental fluidic operations.
Core-shell droplet manipulation reduces the required operational voltage for EWOD devices.
Higher transport velocities are achieved with core-shell droplets compared to traditional methods.

Conclusions:

The core-shell droplet configuration in EWOD systems offers a superior alternative to traditional manipulation methods.
This approach combines the benefits of both air and oil manipulation mediums, enhancing device performance.
The findings pave the way for more efficient and flexible digital microfluidic applications.