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Coplanar Electrowetting-Induced Droplet Detachment from Radially Symmetric Electrodes.

Marcette Greyson¹, Kara L Maki², Michael J Schertzer¹

¹Mechanical Engineering, Rochester Institute of Technology, 76 Lomb Memorial Drive, Rochester, New York 14623, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 20, 2020

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This study shows how to detach droplets in air using electrowetting with a single voltage pulse. New models incorporating gravity accurately predict detachment, improving digital microfluidics.

Area of Science:

Physics
Engineering
Materials Science

Background:

Electrowetting is a technique used to manipulate droplets on surfaces.
Previous models for droplet detachment in air using electrowetting did not account for gravitational effects.
Accurate prediction of droplet detachment is crucial for microfluidic applications.

Purpose of the Study:

To demonstrate electrowetting-induced droplet detachment in air using a single voltage pulse.
To develop and validate models for predicting droplet detachment thresholds.
To incorporate gravitational potential energy changes into detachment models.

Main Methods:

Experiments were conducted using electrowetting devices with coplanar electrodes.
Droplets of varying volumes were detached using single voltage pulses in air.

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Two models were developed, one including gravitational potential energy, and compared to experimental data.

Main Results:

The incorporation of gravitational potential energy significantly improved the accuracy of detachment predictions.
The updated models successfully predicted the critical electrowetting number for droplet detachment.
The models captured the experimentally observed increase in required voltage with increasing droplet volume.

Conclusions:

New models accurately predict electrowetting-induced droplet detachment in air by including gravitational effects.
These models enhance the understanding and control of droplet manipulation in microfluidic systems.
The findings are particularly relevant for 3D digital microfluidics applications involving droplet ejection in air.