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Acoustic trapping in bubble-bounded micro-cavities

Acoustic trapping in bubble-bounded micro-cavities

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Original languageEnglish
Pages (from-to)22-26
Number of pages5
JournalOptofluidics, Microfluidics and Nanofluidics
Issue number1
StatePublished - 5 Dec 2016


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.

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    © 2016 P. O’Mahoney et al., published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.


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