On-Demand Droplet Routing and Splitting Using Independently Addressable Interdigitated Electrodes.

Area of Science:

• Microfluidics
• Biotechnology
• Electrical Engineering

Background:

• Droplet microfluidics offers precise control over small fluid volumes for applications like drug discovery and diagnostics.
• Droplet splitting is crucial for multi-step assays and parallel processing.
• Existing electric-field methods often require high voltages.

Purpose of the Study:

• To develop a low-voltage microfluidic platform for electrically tunable droplet splitting and sorting.
• To integrate tilted interdigitated electrodes (IDEs) with an asymmetric Y-junction for enhanced control.

Main Methods:

• Utilized a microfluidic device with two independently addressable tilted IDE arrays.
• Generated localized electric-field gradients to induce dielectrophoretic droplet deflection.
• Adjusted voltage amplitude and selectively activated electrode arrays for dynamic control.

Main Results:

• Achieved electrically tunable droplet splitting and sorting at moderate voltages.
• Demonstrated dynamic routing of droplets into designated outlets.
• Enabled deterministic real-time splitting with minimal structural complexity.

Conclusions:

• The developed low-voltage platform offers adaptable electrohydrodynamic control for droplet manipulation.
• This technology has potential for advancing high-throughput screening and diagnostics.
• The integrated design simplifies complex droplet operations.