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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium

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Published on: July 8, 2015

Single stream inertial focusing in low aspect-ratio triangular microchannels.

Prithviraj Mukherjee¹, Xiao Wang, Jian Zhou

¹Department of Bioengineering, University of Illinois at Chicago, 851 S. Morgan Street, 218 SEO, Chicago, IL 60607, USA. papauts@uic.edu.

|November 30, 2018

Summary

Researchers developed a novel triangular microchannel for sheathless inertial microfluidics, achieving efficient single-stream focusing of particles. This simple yet effective design enables high-precision particle manipulation and integration into flow cytometry systems.

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Area of Science:

Microfluidics
Biotechnology
Particle Manipulation

Background:

Microfluidic devices are crucial for single stream focusing of cells and particles.
Inertial microfluidics offers sheathless passive focusing but faces challenges with multiple equilibrium positions in rectangular channels.

Purpose of the Study:

To present a new approach for single-stream inertial focusing using a triangular microchannel geometry.
To demonstrate efficient particle focusing and integration into a flow cytometer.

Main Methods:

Fabrication of microchannels using PMMA through micromilling.
Utilizing triangular channel geometry to create a size-dependent single stable equilibrium position.
Employing confocal microscopy for position confirmation and integrating with a laser counting system.

Main Results:

Achieved efficient single-stream focusing of 15 μm diameter beads.
Demonstrated a sheathless flow cytometer with a throughput of ~326 s⁻¹.
Confirmed precise focusing positions using confocal microscopy.

Conclusions:

Triangular microchannels provide a simple, effective method for high-precision single-stream inertial focusing.
The design offers benefits like simplicity, control, small footprint, and ease of integration.
This approach facilitates the development of advanced sheathless flow cytometry systems.