Fig. 5.

a) Photo of the portable syringe pump that is controlled by an Arduino board. b) Flow rate characterization at different rotational speeds of the motor; a linear fit is included with the data (r² = 0.9995). c) Fluorescent images of mixing in the sputum liquefaction chip with the acoustic signal OFF (left) and ON (right). The acoustic signal was 30 V_pp and 4.8 kHz, with a total flow rate in the channel of 79 μL min⁻¹. d) Trapping and e) release of 20 μm particles using a sharp-edge acoustofluidic device. 2.5 μm particles continue to flow through the channel even when the acoustic signal is on. Red arrows indicate large particle motion, and the bulk flow and small particle movement is marked by the blue arrows.