Dynamic radial positioning of a hydrodynamically focused particle stream enabled by a three-dimensional microfluidic...

Area of Science:

• Microfluidics
• Particle Manipulation
• Biotechnology

Background:

• Microfluidic systems are crucial for sample analysis, requiring precise control over particle streams.
• Confining and focusing particle flows are integral to microfluidic device design.

Purpose of the Study:

• To implement a 3D microfluidic nozzle for dynamic particle focusing and positioning.
• To enhance sample flexibility and capabilities in microfluidic analysis.

Main Methods:

• Independent adjustment of three sheath inlet flows to control focused stream size for various microparticle diameters (6, 10, 15 μm).
• Utilized COMSOL Multiphysics modeling (4.75 μm) to simulate fluidic behavior and lamina dynamics.
• Experimental validation of fluidic control for particle stream positioning.

Main Results:

• The 3D microfluidic nozzle successfully controlled focused stream size for different microparticle sizes.
• Dynamic positioning of the focused particle stream within the downstream channel was achieved.
• COMSOL modeling confirmed negligible influence of initial particle position on focusing ability.

Conclusions:

• The developed 3D microfluidic nozzle provides a simple, fast, and fluidically controlled solution for selective particle focusing and positioning.
• This technology holds promise for advanced particle analysis and sorting applications.
• The system's design offers significant flexibility for diverse microfluidic applications.