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Updated: Mar 21, 2026

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A microfluidics-based on-chip impinger for airborne particle collection.

I Mirzaee1, M Song, M Charmchi

  • 1Mechanical Engineering Department, University of Massachusetts Lowell, Lowell, MA, USA. Hongwei_Sun@uml.edu.

Lab on a Chip
|May 18, 2016
PubMed
Summary

A novel microimpinger device effectively captures airborne particles using controlled microbubble generation. This miniaturized system achieves over 90% collection efficiency for various particle sizes, advancing sensor technology.

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Area of Science:

  • Microfluidics and particle analysis
  • Development of novel microfluidic devices
  • Particle capture and sensing technologies

Background:

  • Airborne particle capture is crucial for sensors and analytical systems.
  • Existing methods may lack miniaturization and efficiency.
  • Microfluidic approaches offer potential for improved particle sampling.

Purpose of the Study:

  • To develop and characterize a miniaturized airborne particle sampling device (microimpinger).
  • To investigate the bubble generation and particle capture mechanisms within the microimpinger.
  • To optimize the microimpinger for high collection efficiency.

Main Methods:

  • Fabrication of microchannel arrays using soft-lithography with polydimethylsiloxane (PDMS).
  • Development of a PDMS-only sealing technique for air leakage prevention.

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  • Surface modification with a Teflon layer to enhance hydrophobicity for stable bubble generation.
  • Experimental measurement of collection efficiency using fluorescent polystyrene latex particles.
  • Computational fluid dynamics (CFD) modeling (Navier-Stokes, Volume-of-Fluid, Lagrangian particle tracking) to study capture mechanisms and bubble dynamics.

    • Main Results:

    • Successful fabrication of a microimpinger with a PDMS-only sealing technique.
    • Demonstrated critical role of microchannel surface hydrophobicity for stable bubble formation.
    • Achieved collection efficiencies exceeding 90% for various particle sizes.
    • CFD model elucidated particle capture mechanisms during microbubble formation and rise.
    • CFD analysis indicated bubble size influences collection efficiency.

    Conclusions:

    • The developed microimpinger is a highly efficient device for airborne particle sampling.
    • Surface hydrophobicity is a key parameter for optimizing microbubble generation and particle capture.
    • CFD modeling provides valuable insights into the underlying physics of particle-microbubble interaction.
    • This technology holds promise for advancing miniaturized sensor and analytical systems.