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Effective cell trapping using PDMS microspheres in an acoustofluidic chip.

Di Yin1, Gangwei Xu1, Mengyuan Wang1

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People's Republic of China.

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|June 17, 2017
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Summary

Acoustic radiation forces enable facile particle-based cell manipulation. Different particles align uniquely in ultrasonic standing waves, allowing for precise cell trapping and non-invasive biological sample separation.

Keywords:
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Area of Science:

  • Biophysics
  • Microfluidics
  • Acoustofluidics

Background:

  • Particle manipulation is crucial for cell-based assays and biological sample separation.
  • Acoustic radiation forces offer a non-invasive method for manipulating microparticles and cells.

Purpose of the Study:

  • To investigate particle behavior under ultrasonic standing waves (USWs) in microfluidic chips.
  • To demonstrate a facile particle-based cell manipulation method using acoustic forces.
  • To evaluate the potential for cell trapping and non-invasive biological sample manipulation.

Main Methods:

  • Utilized a microfluidic chip with ultrasonic standing waves (USWs).
  • Investigated responses of poly(lactic-co-glycolic acid) (PLGA) microspheres, silica-coated magnetic microbeads, and polydimethylsiloxane (PDMS) microspheres to USWs.
  • Performed cell viability tests to assess the impact of ultrasonic manipulation.

Main Results:

  • Particles with positive acoustic contrast factors (PLGA, silica-coated magnetic microbeads) aligned centrally.
  • Particles with negative acoustic contrast factors (PDMS microspheres) translocated to channel sidewalls.
  • Functional PDMS microspheres successfully trapped cells at pressure antinodes.
  • Ultrasonic manipulation showed no harmful effects on cell viability.

Conclusions:

  • Acoustic radiation forces provide a versatile platform for particle and cell manipulation in microfluidics.
  • The differential alignment of particles based on acoustic contrast factors enables targeted cell trapping.
  • This acoustofluidic technique holds promise for developing rapid, non-invasive cell detection and biological sample separation assays.