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Fig. 2 Acoustofluidic behavior of the vibrating capillary in an open liquid channel. a) Schematic of the polarized vortex. Blue and yellow curved arrows denote the out-of-plane vortex and in-plane vortex, respectively. b) Visualization of both the out-of-plane vortex and in-plane vortex using 2 μm polystyrene particles. The ultrasound excitation frequency and voltage were 185 kHz and 4 VPP, respectively. c) Trapping of 15 μm polystyrene particles around the capillary in liquid. The ultrasound excitation frequency and voltage were 185 kHz and 6 VPP, respectively. Scale bar, 100 μm.
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