Acoustic trapping in bubble-bounded micro-cavities

P. O'Mahoney (Lead / Corresponding author), C. McDougall, P. Glynne-Jones, M. P. MacDonald

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We present a method for controllably producing longitudinal acoustic trapping sites inside microfluidic channels. Air bubbles are injected into a micro-capillary to create bubble-bounded ‘micro-cavities’. A cavity mode is formed that shows controlled longitudinal acoustic trapping between the two air/water interfaces along with the levitation to the centre of the channel that one would expect from a lower order lateral mode. 7 µm and 10 µm microspheres are trapped at the discrete acoustic trapping sites in these micro-cavities. We show this for several lengths of micro-cavity.
Original languageEnglish
Pages (from-to)22-26
Number of pages5
JournalOptofluidics, Microfluidics and Nanofluidics
Issue number1
Publication statusPublished - 5 Dec 2016


  • acoustic trapping
  • transducer
  • lab-on-a-chip
  • 3D trapping


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