Engineering 3D parallelized microfluidic droplet generators with equal flow profiles by computational fluid dynamics...

Area of Science:

• Microfluidics and Biomedical Engineering
• Materials Science and Nanotechnology

Background:

• Microfluidic droplet generators produce precise droplets but suffer from low throughput, limiting applications.
• Existing parallelization methods for microfluidic devices are constrained by traditional 2D fabrication techniques.

Purpose of the Study:

• To develop a facile method for producing high-throughput, three-dimensionally (3D) parallelized microfluidic droplet generators.
• To demonstrate the capability of these 3D-printed devices for generating microparticles and encapsulating cells.

Main Methods:

• Designed 3D-parallelized microfluidic droplet generators using stacked and radially multiplexed channels.
• Employed computational fluid dynamics (CFD) for microflow distributor design to ensure uniform flow rates.
• Utilized stereolithography for fabricating microdevices with features as small as 50 μm, including hollow channels.

Main Results:

• Successfully fabricated robust 3D microfluidic devices capable of operating up to 4 bars without leakage or deformation.
• Demonstrated high-throughput production of water-in-oil emulsions and polymer droplets for microparticle templating.
• Showcased cytocompatibility by encapsulating mesenchymal stem cells, maintaining viability and metabolic activity for 21 days.

Conclusions:

• Stereolithography enables effective 3D parallelization of microfluidic droplet generators, overcoming throughput limitations.
• The developed 3D-printed microfluidic devices offer a versatile platform for microparticle generation and cell encapsulation applications.