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Low power sessile droplets actuation via modulated surface acoustic waves

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4 Author(s)
Baudoin, Michael ; International Associated Laboratory LEMAC, IEMN, UMR CNRS 8520, Université des Sciences et Technologies de Lille and EC Lille, 59652 Villeneuve dAscq Cédex, France ; Brunet, Philippe ; Bou Matar, Olivier ; Herth, Etienne

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Low power actuation of sessile droplets is of primary interest for portable or hybrid lab-on-a-chip and harmless manipulation of biofluids. In this paper, we show that the acoustic power required to move or deform droplets via surface acoustic waves can be substantially reduced through the forcing of the drops inertio-capillary modes of vibrations. Indeed, harmonic, superharmonic, and subharmonic (parametric) excitation of these modes are observed when the high frequency acoustic signal (19.5 MHz) is modulated around Rayleigh-Lamb inertio-capillary frequencies. This resonant behavior results in larger oscillations and quicker motion of the drops than in the non-modulated case.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 15 )

Date of Publication:

Apr 2012

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