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Related Experiment Video

Updated: Jul 15, 2026

A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice
11:32

A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice

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Microparticle separation with an acoustic-gravity field controlled by phase-shift operation.

Takashi Masudo1, Tetsuo Okada

  • 1Department of Chemistry, Tokyo Institute of Technology, Tokyo, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|April 11, 2007
PubMed
Summary

Particle elution from acoustic-gravity channels is controlled using ultrasound phase shifts. This method allows for particle retention and separation within the channel for precise manipulation.

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Area of Science:

  • Acoustofluidics
  • Particle Manipulation
  • Separation Science

Background:

  • Particle manipulation in microfluidic devices is crucial for various applications.
  • Controlling particle elution in coupled acoustic-gravity channels presents challenges.
  • Existing methods may lack precision or efficiency in particle separation.

Purpose of the Study:

  • To investigate the control of particle elution in acoustic-gravity channels.
  • To demonstrate particle separation using phase-shifted ultrasound.
  • To establish a method for retaining and separating particles within a channel.

Main Methods:

  • Utilizing a coupled acoustic-gravity channel.
  • Employing two ultrasound transducers driven at the same frequency but different phases.

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  • Implementing a phase-shift operation to control ultrasound wave patterns.

    • Main Results:

    • Successful control of particle elution via phase-shift operation.
    • Formation of an ultrasound node near the channel wall, enabling particle retention.
    • Demonstrated separation of two distinct particle types under specific conditions.

    Conclusions:

    • Phase-shifted ultrasound offers precise control over particle elution in acoustic-gravity channels.
    • This technique enables efficient particle retention and separation.
    • The developed method has potential applications in microfluidic particle sorting and analysis.