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Updated: Sep 29, 2025

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Harmonic acoustics for dynamic and selective particle manipulation.

Shujie Yang1, Zhenhua Tian1, Zeyu Wang1

  • 1Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC, USA.

Nature Materials
|March 25, 2022
PubMed
Summary
This summary is machine-generated.

We developed a harmonic acoustics for non-contact, dynamic, selective (HANDS) particle manipulation platform. This method enables precise, reversible assembly of colloids and cells, and quantifies intercellular forces.

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Area of Science:

  • * Physics
  • * Materials Science
  • * Life Sciences

Background:

  • * Precise manipulation of colloids and biological cells is crucial for advancements in materials science, physics, and life sciences.
  • * Existing methods often require surface treatments or material property modifications.
  • * Non-contact, dynamic, and selective manipulation techniques are highly sought after.

Purpose of the Study:

  • * To introduce a novel particle manipulation platform using harmonic acoustics.
  • * To demonstrate the reversible assembly of colloidal crystals and cells without material modification.
  • * To apply the platform for quantifying intercellular adhesion forces in cancer cell lines.

Main Methods:

  • * Development of a harmonic acoustics for non-contact, dynamic, selective (HANDS) particle manipulation platform.
  • * Use of Fourier-synthesized harmonic waves to create soft acoustic lattices and colloidal crystals.
  • * Modulation of acoustic trapping positions with subwavelength resolution for dynamic control.

Main Results:

  • * Achieved reversible assembly of colloidal crystals and cells via acoustic trapping.
  • * Demonstrated active control of lattice constant and interparticle distance.
  • * Successfully quantified intercellular adhesion forces among various cancer cell lines with high sensitivity.

Conclusions:

  • * The HANDS platform offers a versatile, non-contact method for manipulating soft matter.
  • * The platform enables precise, selective, and reversible assembly of particles.
  • * HANDS is a valuable tool for measuring biological interactions, such as intercellular forces.