Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Size-based separation of microscale droplets by surface acoustic wave-induced acoustic radiation force

표면파 유도 음향방사력을 이용한 미세액적의 크기 선별

  • Mushtaq, Ali (Department of Mechanical Engineering, Chonnam National University) ;
  • Beomseok, Cha (Department of Mechanical Engineering, Chonnam National University) ;
  • Muhammad, Soban Khan (Department of Mechanical Engineering, Chonnam National University) ;
  • Hyunwoo, Jeon (Department of Mechanical Engineering, Chonnam National University) ;
  • Song Ha, Lee (Department of Mechanical Engineering, Chonnam National University) ;
  • Woohyuk, Kim (Department of Mechanical Engineering, Chonnam National University) ;
  • Jeongu, Ko (Department of Mechanical Engineering, Chonnam National University) ;
  • Jinsoo, Park (Department of Mechanical Engineering, Chonnam National University)
  • Received : 2022.10.16
  • Accepted : 2022.10.27
  • Published : 2022.11.30
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Abstract

In droplet microfluidics, precise droplet manipulation is required in numerous applications. This study presents ultrasonic surface acoustic wave (USAW)-based microfluidic device for label-free droplet separation based on size. The proposed device is composed of a slanted-finger interdigital transducer on a piezoelectric substrate and a polydimethylsiloxane microchannel placed on the substrate. The microchannel is aligned in the cross-type configuration where the USAWs propagate in a perpendicular direction to the flow in the microchannel. When droplets are exposed to an acoustic field, they experience the USAW-induced acoustic radiation force (ARF), whose magnitude varies depending on the droplet size. We modeled the USAW-induced ARF based on ray acoustics and conducted a series of experiments to separate different-sized droplets. We found that the experimental results were in good agreement with the theoretical estimation. We believe that the proposed method will serve as a promising tool for size-based droplet separation in a label-free manner.

Keywords

Acknowledgement

This work was financially supported by Chonnam National University (Grant number: 2021-2225) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1F1A1048611). The microfluidic devices were fabricated by using a mask aligner (MDA-400S, MIDAS) at Energy Convergence Core Facility in Chonnam National University.

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