Figure 2.

(A) Three-dimensional schematic of the acoustic trapping device. A glass capillary is attached to a piezoelectric transducer. The transducer is soldered to a circuit board for electronic interfacing and controlling the sound wave. (B) Model of the trapping device viewed from the top. Particles are trapped over the transducer. (C) Model of the standing acoustic wave inside the channel viewed from the side. Particle clusters are shown, collected in the nine nodes created by the standing wave.