Fig. 2: Characterization of bubble dynamics.
From: Cyclic jetting enables microbubble-mediated drug delivery
In the legend, low pa and high pa refer to Fig. 1c,d, respectively. The red arrows at the top indicate when jets occur in the high-pa case. Methods provides details about the theoretical models. a, Experimental and theoretical radial motion of the microbubble. The uncertainty in the bubble radius measurement corresponds to half the pixel size (80 nm). b, Ultrasound pulse driving the microbubble. The pulse shape is recorded with a hydrophone. The pulse amplitude is inferred as the only fitting parameter from the corresponding radius–time curve in a. c, Experimental and theoretical vertical positions of the microbubble centroid. The yellow area represents the plastic substrate. The uncertainty in the bubble position measurement corresponds to half the pixel size (80 nm). d, Time evolution of the pressure-gradient contributions from the ultrasound pulse and plastic substrate at the bubble position. The curves for the two ultrasound pressure cases are vertically offset to enhance visibility. e, Evolution of the dimensionless impulse contributions from the ultrasound, the plastic substrate and the sum thereof over ultrasound cycles.
