Block-and-break generation of microdroplets with fixed volume

Area of Science:

• Microfluidics
• Fluid Dynamics
• Chemical Engineering

Background:

• Traditional droplet generators often suffer from volume variability due to fluctuating flow rates.
• Precise control over droplet volume is crucial for applications in drug delivery, diagnostics, and materials science.

Purpose of the Study:

• To introduce a novel microfluidic device for generating droplets with volumes determined solely by geometry.
• To demonstrate the versatility of this fixed-volume droplet generator across different experimental conditions.

Main Methods:

• A T-junction microfluidic chip incorporating a bypass channel was designed and fabricated.
• The bypass channel redirects the continuous phase, allowing droplet formation without premature breakup.
• Droplet generation was triggered by the dispersed phase blocking the bypass exit.

Main Results:

• The generator produced highly monodisperse droplets with volumes independent of liquid flow rates.
• Demonstrated controlled formation of droplets with varying internal solute concentrations.
• Showcased parallel production of multiple streams of monodisperse droplets.

Conclusions:

• The novel droplet generator offers precise, geometry-defined volume control, overcoming limitations of flow-rate-dependent methods.
• This technology enables robust and reproducible droplet generation for advanced microfluidic applications.
• The demonstrated capabilities highlight its potential for scalable and customizable droplet production.