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(a) Ultrasound signal recorded during HIFU interrogation from 300–400 nm (mean diameter) PFH droplets, formulated out of 100:0:0 (purple diamonds) and 47.5:47.5:5 (red circles) compositions; (b) Mass yield of 300–400 nm mean diameter droplets for representative shell compositions; (c–d): Progression of mean size (c) and concentration (d) over time for fractionated PFH droplets stored at 2–8°C – 100:0:0 (purple diamonds) and 47.5:47.5:5 (red circles). Error bars represent 1 SD.
