Abstract
The capture of locomotive small organisms is challenging but interesting. In this study, we developed a method to capture Paramecium with acoustic valve. Constructed by the focused surface acoustic waves (FSAW), acoustic valve can be used to block the dispersed phase in liquid flow. Under the joint action of acoustic radiation force and drag force, Paramecium can be successfully confined in a narrow space in the channel without losing its movement ability. By adjusting the applied voltage and the inlet pressure, the Paramecium can be allowed to pass, but the Paramecium cysts get captured. This acoustic device is potential in biochemical experiments, providing a new method for capturing or sorting micro swimmers.
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