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Ultra-Stretchable Microfluidic Devices for Optimizing Particle Manipulation in Viscoelastic Fluids.

Xiaoyue Kang1, Jingtao Ma2, Haotian Cha3

  • 1School of Mechanical and Mining Engineering, University of Queensland, St. Lucia, Brisbane, Queensland 4067, Australia.

ACS Applied Materials & Interfaces
|November 4, 2024
PubMed
Summary

Flexible microfluidic devices enable tunable channel dimensions for particle and cell separation. This adaptable approach optimizes viscoelastic microfluidics, reducing fabrication time and cost.

Keywords:
cancer cell separationcell separationparticle separationstretchable microfluidic deviceviscoelastic fluidsviscoelastic microfluidics

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Area of Science:

  • Microfluidics
  • Non-Newtonian fluid mechanics
  • Biomaterials

Background:

  • Viscoelastic microfluidics utilizes non-Newtonian fluid properties for particle manipulation.
  • Optimizing microchannel geometry in rigid devices is iterative and resource-intensive.
  • Flexible materials offer a novel approach to dynamic microfluidic device design.

Purpose of the Study:

  • To develop a flexible microfluidic device with adjustable channel dimensions.
  • To investigate the impact of channel aspect ratio on particle and cell migration in viscoelastic fluids.
  • To demonstrate the utility of stretchable microfluidics for separation applications.

Main Methods:

  • Fabrication of a microfluidic device using ultra-stretchable Flexdym material.
  • External stretching to dynamically alter microchannel dimensions and aspect ratio (1-5).
  • Systematic investigation of particle migration influenced by aspect ratio, particle size, flow rate, and poly(ethylene oxide) (PEO) concentration.

Main Results:

  • Achieved adjustable channel aspect ratios from 1 to 5 via external stretching.
  • Quantified the effects of varying parameters on particle migration within the viscoelastic fluid.
  • Successfully demonstrated particle and cell separation using channels with an aspect ratio of 3.

Conclusions:

  • Flexible microfluidic devices offer a versatile platform for optimizing particle and cell separation.
  • Dynamic control over channel geometry significantly impacts viscoelastic microfluidic performance.
  • This adaptable technology streamlines the development of microfluidic separation systems.