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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.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 3, 2023
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.
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.
