Droplet trapping and fast acoustic release in a multi-height device with steady-state flow

Rambach, R. W., Linder, K., Heymann, M. and Franke, T. (2017) Droplet trapping and fast acoustic release in a multi-height device with steady-state flow. Lab on a Chip, 17(20), pp. 3422-3430. (doi: 10.1039/C7LC00378A) (PMID:28792054)

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We demonstrate a novel multilayer polydimethylsiloxane (PDMS) device for selective storage and release of single emulsion droplets. Drops are captured in a microchannel cavity and can be released on-demand through a triggered surface acoustic wave pulse. The surface acoustic wave (SAW) is excited by a tapered interdigital transducer (TIDT) deposited on a piezoelectric lithium niobate (LiNbO3) substrate and inverts the pressure difference across the cavity trap to push a drop out of the trap and back into the main flow channel. Droplet capture and release does not require a flow rate change, flow interruption, flow inversion or valve action and can be achieved in as fast as 20 ms. This allows both on-demand droplet capture for analysis and monitoring over arbitrary time scales, and continuous device operation with a high droplet rate of 620 drops per s. We hence decouple long-term droplet interrogation from other operations on the chip. This will ease integration with other microfluidic droplet operations and functional components.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Franke, Professor Thomas
Authors: Rambach, R. W., Linder, K., Heymann, M., and Franke, T.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Lab on a Chip
Publisher:Royal Society of Chemistry
ISSN (Online):1473-0189
Published Online:02 August 2017

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