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Issue 7, 2012
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Nebulisation on a disposable array structured with phononic lattices

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We demonstrate the use of a phononic crystal to enable the nebulisation of liquid droplets from low-cost disposable arrays, using surface acoustic waves (SAW). The SAWs were generated using interdigitated transducers (IDT) on a piezoelectric surface (LiNbO3) and the acoustic waves were coupled into a disposable phononic crystal structure, referred to as a superstrate. Using its excellent reflecting properties, the phononic structures confined the acoustic field within the superstrate, resulting in the concentration of the acoustic energy, in a manner controllable by the excitation frequency. We show that this capability mitigates against coupling losses incurred by the use of a disposable superstrate, greatly reducing the time needed to nebulise a drop of water with respect to an unstructured superstrate for a given power. We also demonstrate that by changing the excitation frequency, it is possible to change the spatial position at which the acoustic energy is concentrated, providing a means to specifically nebulise drops across an array. These results open up a promising future for the use of phonofluidics in high-throughput sample handling applications, such as drug delivery or the “soft” transfer of samples to a mass spectrometer in the field of proteomics.

Graphical abstract: Nebulisation on a disposable array structured with phononic lattices

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The article was received on 30 Jul 2011, accepted on 19 Jan 2012 and first published on 10 Feb 2012

Article type: Paper
DOI: 10.1039/C2LC20705B
Citation: Lab Chip, 2012,12, 1268-1273
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    Nebulisation on a disposable array structured with phononic lattices

    J. Reboud, R. Wilson, Y. Zhang, M. H. Ismail, Y. Bourquin and J. M. Cooper, Lab Chip, 2012, 12, 1268
    DOI: 10.1039/C2LC20705B

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