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Related Experiment Video

Updated: Sep 10, 2025

A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice

A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice

Published on: November 23, 2015

Label-Free, Sheathless Ferrohydrodynamic Microfluidic Chip for Size-Dependent Sorting.

Pufan Yang, Xintong Xie, Zhinan Zhang

IEEE Transactions on Bio-Medical Engineering

|August 21, 2025

Summary

This summary is machine-generated.

This study introduces a novel sheathless microfluidic sorting chip using ferrohydrodynamics, eliminating sample dilution. The technology achieves high-throughput, precise separation of rare biological particles like circulating tumor cells.

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Last Updated: Sep 10, 2025

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Area of Science:

Biotechnology
Microfluidics
Biophysics

Background:

Conventional microfluidic sorting systems often suffer from sample dilution due to sheath flow.
Sheath flow dependency limits the efficiency and applicability of current sorting technologies.

Purpose of the Study:

To develop a sheathless microfluidic sorting chip to overcome sample dilution issues.
To leverage ferrohydrodynamic effects for precise particle separation without sheath flow.

Main Methods:

Integration of Dean flow pre-focusing in asymmetric serpentine channels.
Utilized gradient magnetic field modulation with Halbach magnet arrays for precise separation.
Achieved effective magnetic gradients over short distances.

Main Results:

Demonstrated precise separation of size-similar particles (5 µm resolution).
Achieved high throughput of 6×10⁴ particles/min.
Reported sorting purity of 82.6% for 20 µm and 82.2% for 15 µm microspheres.

Conclusions:

Developed a novel label-free, sheathless sorting technology.
This method offers significant potential for isolating rare biological particles, such as circulating tumor cells.
The technology has substantial scientific and practical implications for various applications.