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Microparticle Manipulation Performed on a Swirl-Based Microfluidic Chip Featured by Dual-Stagnation Points.

Yanping Dang1, Shuai Hu1, Zhiming Ou1

  • 1School of Mechanical and Automotive Engineering, South China University of Technology, Wushan Road, Tianhe District, 510641 Guangzhou, P. R. China.

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Summary

This study introduces a dual-stagnation microfluidic chip for precisely controlling two microparticles simultaneously using swirling flow regions. The novel design enhances soft control and manipulation capabilities for bio/chemical particle interactions.

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Biotechnology

Background:

  • Stagnation-based microfluidics offers noncontact, low-cost microparticle control.
  • Existing methods face limitations in precise pose regulation and soft control.
  • Previous work focused on single particle control using swirling flow regions (SFRs).

Purpose of the Study:

  • To propose and validate a novel 3-microchannel structure for simultaneous control of two microparticles.
  • To investigate the dual-stagnation model for generating two SFRs for particle capture and manipulation.
  • To explore the regulation of SFRs by adjusting microchannel inlet velocities.

Main Methods:

  • Computational fluid dynamics (CFD) simulations were used to optimize the fluid field structure.
  • A 3D-printed microfluidic chip was fabricated for experimental validation.
  • Inlet velocities were adjusted to regulate the generated SFRs and stagnation points.

Main Results:

  • The dual-stagnation model successfully generated two distinct SFRs with stable stagnation points.
  • Simultaneous capture and control of two microparticles were demonstrated experimentally.
  • Simulation and experimental results showed strong agreement in flow streamlines and stagnation point regulation.
  • Microparticles of varying shapes and sizes were effectively captured and manipulated.

Conclusions:

  • The dual-stagnation microfluidic chip enables advanced flow field structuring for swirl-based systems.
  • This technology provides a platform for soft contact and flexible manipulation of multiple microparticles.
  • The findings offer insights into studying interactions between bio/chemical microparticles.