Abstract
In this study, we report the numerical and experimental results of guided acoustic mode switching between surface and plate acoustic waves (SAWs and PAWs) for manipulating microparticles suspended in a microfluidic channel. Numerical results show switchable acoustic pressure and acoustic radiation force fields for controlling particle motion in the microfluidic channel by acoustic mode switching. Acoustic mode switching can be achieved by designing an acoustic-wave device and by changing the frequencies of the input electrical signal. The working mechanisms of acoustic-mode-switchable manipulation are revealed. On the basis of numerical prediction, the feasibility of a mode-switchable acoustic microfluidic device is experimentally demonstrated, and the actuation of suspended microparticles using SAWs and PAWs is achieved. We note that this study provides access to mode-switching acoustophoresis.
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