Low power sessile droplet actuation via modulated surface acoustic waves

Details Low power sessile droplet actuation via modulated surface acoustic waves Low power sessile droplet actuation via modulated surface acoustic waves

2012-03-08

arxiv.org/abs/1203.1841v1

Physics

Fluid Dynamics

Scientific paper

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.

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