This paper presents a novel approach for microfluid mixing by loosely-focused acoustic waves (generated by piezoelectric Zinc Oxide thin film). Initial results show that our acoustic-wave liquid mixer (AWLM) produces a convection flow in liquid very efficiently, when it is driven by a sinusoidal wave with frequencies corresponding to the thickness-mode resonances (e.g. 240 and 480 MHz) of the piezoelectric film. The AWLM operates without any significant temperature increase in liquid, and will be very attractive for mixing temperature-sensitive fluids.

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