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Label-Free Particle Accumulation in Helical Microtubes with Secondary Flows.

Tianmian Liu1, Deyun Liu1, Shenghong Zhang1

  • 1Key Laboratory of Hydrodynamics (Ministry of Education), Department of Engineering Mechanics, School of Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

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Summary

This study introduces helical microfluidic channels for label-free sorting of rare cells and exosomes. The research clarifies particle dynamics, improving precision in biological separation systems.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Cell Sorting

Background:

  • Curved microfluidic channels use secondary flows for label-free sorting of rare and heterogeneous targets like exosomes and cells.
  • Limited understanding of particle dynamics in these channels restricts sorting efficiency and precision.

Purpose of the Study:

  • To develop a 3D microfluidic platform with helical channels to study particle dynamics and improve sorting.
  • To observe cross-sectional particle distributions and understand factors influencing migration patterns.

Main Methods:

  • Developed a 3D microfluidic platform with helical microtubular channels.
  • Generated steady, tunable secondary flows across various Reynolds and Dean numbers.
  • Identified and classified five distinct particle dynamic patterns using an inertial force ratio (γ).

Main Results:

  • Observed five distinct dynamic patterns in particle migration.
  • Classified patterns based on evolution from lift-dominated to drag-dominated regimes.
  • Found that particle distribution depends on inertial force ratio (γ) and capillary number (Ca) for deformable cells.

Conclusions:

  • Particle migration in secondary-flow microfluidics is complex, influenced by inertial and capillary forces.
  • An off-axis collection strategy can enhance sorting performance by utilizing nonhorizontal equilibrium positions.
  • The findings support the design of high-precision, label-free separation systems for biological analysis.