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Issue 2, 2011
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Phononic crystal structures for acoustically driven microfluidic manipulations

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Abstract

The development of microfluidic systems is often constrained both by difficulties associated with the chip interconnection to other instruments and by limitations imposed by the mechanisms that can enable fluid movement and processing. Surface acoustic wave (SAW) devices have shown promise in allowing samples to be manipulated, although designing complex fluid operations involves using multiple electrode transducers. We now demonstrate a simple interface between a piezoelectric SAW device and a disposable microfluidic chip, patterned with phononic structures to control the acoustic wave propagation. The surface wave is coupled from the piezoelectric substrate into the disposable chip where it interacts with the phononic lattice. By implementing both a phononic filter and an acoustic waveguide, we illustrate the potential of the technique by demonstrating microcentrifugation for particle and cell concentration in microlitre droplets. We show for the first time that the interaction of the fluid within this metamaterial phononic lattice is dependent upon the frequency of the acoustic wave, providing a route to programme complex fluidic functions into a microchip (in much the same way, by analogy, that a holographic element would change the phase of a light wave in optical tweezers). A practical realisation of this involves the centrifugation of blood on the chip.

Graphical abstract: Phononic crystal structures for acoustically driven microfluidic manipulations

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Publication details

The article was received on 23 Jul 2010, accepted on 06 Oct 2010 and first published on 08 Nov 2010


Article type: Paper
DOI: 10.1039/C0LC00234H
Citation: Lab Chip, 2011,11, 323-328
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    Phononic crystal structures for acoustically driven microfluidic manipulations

    R. Wilson, J. Reboud, Y. Bourquin, S. L. Neale, Y. Zhang and J. M. Cooper, Lab Chip, 2011, 11, 323
    DOI: 10.1039/C0LC00234H

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