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Amplification of Acoustic Forces Using Microbubble Arrays Enables Manipulation of Centimeter-Scale Objects

Rahul Goyal, Athanasios G. Athanassiadis, Zhichao Ma, and Peer Fischer
Phys. Rev. Lett. 128, 254502 – Published 24 June 2022
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Abstract

Manipulation of macroscale objects by sound is fundamentally limited by the wavelength and object size. Resonant subwavelength scatterers such as bubbles can decouple these requirements, but typically the forces are weak. Here we show that patterning bubbles into arrays leads to geometric amplification of the scattering forces, enabling the precise assembly and manipulation of cm-scale objects. We rotate a 1 cm object continuously or position it with 15μm accuracy, using sound with a 50 cm wavelength. The results are described well by a theoretical model. Our results lay the foundation for using secondary Bjerknes forces in the controlled organization and manipulation of macroscale structures.

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  • Received 28 December 2021
  • Revised 18 April 2022
  • Accepted 13 May 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.254502

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsPolymers & Soft Matter

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Manipulating Objects Using Air Bubbles and Sound Waves

Published 24 June 2022

Centimeter-scale objects in liquid can be manipulated using the mutual attraction of two arrays of air bubbles in the presence of sound waves.

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Authors & Affiliations

Rahul Goyal1, Athanasios G. Athanassiadis1,*, Zhichao Ma1,†, and Peer Fischer1,2

  • 1Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany
  • 2Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany

  • *thanasi@is.mpg.de
  • zma@is.mpg.de

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Vol. 128, Iss. 25 — 24 June 2022

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