Active manipulation of inhomogeneous miscible fluid interfaces using acoustical tweezers

Samir Almohamad*, Sarah Cleve, Udita Ghosh, Ravinder Chutani, Gustav K. Modler, Henrik Bruus, Michael Baudoin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

The manipulation of immiscible fluids at microscales has paved the way for a wide range of applications and technologies. In particular, ultrasounds serve as versatile tools for manipulating dispersed immiscible droplets. By shaping the acoustic field, droplets can be sorted, divided, merged, selected, and positioned. Typical approaches involve standing waves to attract and trap droplets at fixed pressure nodes/antinodes or traveling waves to displace droplets in the direction of the ultrasound wave propagation. Recent advancements have enabled precise manipulation of selected droplets using selective acoustic tweezers based on focused beams, or acoustical vortices. However, the ultrasound-based manipulation of miscible fluids has only recently been demonstrated theoretically by Karlsen, Augustsson, and Bruus [1]. In this case, the manipulation results from an acoustic force density appearing due to the inhomogeneity in density and sound speed between the two fluids. In this work, we experimentally demonstrate the application of acoustic tweezers to pattern, trap, and displace high-concentration miscible-fluid islands (Ficoll-PM400) within a lower-concentration medium (water) using ultrasounds. This research establishes the basis for ultrasound-based drug and chemical manipulation, with diverse applications in biology and medicine.

Original languageEnglish
Title of host publicationProceedings of 10th Convention of the European Acoustics Association
PublisherEuropean Acoustics Association
Publication date2023
Pages5743-5746
ISBN (Electronic)978-888894267-4
Publication statusPublished - 2023
Event10th Convention of the European Acoustics Association - Politecnico di Torino, Torino, Italy
Duration: 11 Sept 202315 Sept 2023
https://www.fa2023.org/

Conference

Conference10th Convention of the European Acoustics Association
LocationPolitecnico di Torino
Country/TerritoryItaly
CityTorino
Period11/09/202315/09/2023
Internet address
SeriesProceedings of Forum Acusticum
ISSN2221-3767

Keywords

  • Acoustic tweezers
  • Acoustic vortices
  • Acoustofluidics
  • Microfluidics
  • Miscible fluids

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