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Size-Dependent Inertial Focusing Position Shift and Particle Separations in Triangular Microchannels.

Jeong-Ah Kim1, Je-Ryung Lee2, Tae-Jin Je2

  • 1Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea.

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|December 23, 2017
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Summary

Microfluidic channel shape controls particle focusing. Isosceles right triangle channels enable efficient particle separation (>95%) by manipulating inertial focusing positions, offering a simple, tunable method for rare cell isolation.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Biotechnology

Background:

  • Inertial microfluidics utilizes channel geometry for particle manipulation.
  • Cross-sectional shape is a key parameter influencing inertial focusing.
  • Nonrectangular channels offer unique control over particle behavior.

Purpose of the Study:

  • Investigate unique inertial focusing shifts in isosceles right triangle microchannels.
  • Explore the impact of Reynolds number and particle size on focusing positions.
  • Develop a novel microparticle separation method based on observed phenomena.

Main Methods:

  • Detailed investigation of inertial focusing in isosceles right triangle channels.
  • Analysis of particle behavior with varying Reynolds numbers and sizes.
  • Demonstration of rare cell separation using the developed method.

Main Results:

  • Focusing positions shift along channel walls with increasing Reynolds number and decreasing particle size.
  • Larger particles exhibit opposite focusing behavior due to shear gradient lift.
  • Achieved high-efficiency (>95%) microparticle separation with resolution <2 μm.
  • Successfully separated MCF-7 cells from blood with high yield and throughput.

Conclusions:

  • Isosceles right triangle channel geometry provides a novel mechanism for microparticle separation.
  • The method is simple, tunable via flow rate, and requires no complex optimization.
  • Demonstrated practical application in rare cell isolation from biological samples.