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Contactless, programmable acoustofluidic manipulation of objects on water.

Peiran Zhang1, Chuyi Chen, Feng Guo

  • 1Department of Mechanical Engineering and Material Science, Duke University, NC 27708, USA. tony.huang@duke.edu.

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Summary

This study introduces a new acoustofluidic method for contactless manipulation of small objects on water. It utilizes a novel interdigital transducer (IDT) to precisely control the movement of droplets and biological samples without physical contact.

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Area of Science:

  • Acoustofluidics
  • Biotechnology
  • Materials Science

Background:

  • Contact-free manipulation of small objects is crucial for biological and material processing.
  • Existing acoustic manipulation techniques face limitations like evaporation and inefficient air coupling.

Purpose of the Study:

  • To develop a novel acoustofluidic mechanism for contactless manipulation of objects on water.
  • To demonstrate programmable manipulation of droplets and biological samples.

Main Methods:

  • Fabrication of a hollow-square-shaped interdigital transducer (IDT) on lithium niobate (LiNbO3) immersed in water.
  • Utilizing the IDT as both a sound source and a micropump for fluidic control.
  • Developing a 6-by-6 array fluidic processor with patterned IDT units.

Main Results:

  • Achieved unidirectional, horizontal manipulation of floating objects via directed acoustic wave propagation.
  • Demonstrated successful contactless manipulation of oil droplets and zebrafish larvae on water.
  • Showcased programmable control over object movement in orthogonal directions (±x and ±y).

Conclusions:

  • The developed acoustofluidic mechanism enables efficient, contactless manipulation of small objects on water.
  • This technology offers a promising platform for programmable processing of materials and biosamples.
  • The study advances acoustofluidic applications in microfluidics and lab-on-a-chip systems.