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. Author manuscript; available in PMC: 2017 Nov 29.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2016 Oct 20;64(1):252–263. doi: 10.1109/TUFFC.2016.2619685

Fig. 4.

Fig. 4

Example of monodisperse DDFP droplets before and after conversion into bubbles. (a) Microscope image of droplets (mean diameter = 6.6 μm and CV = 2.7%) on the glass slide after complete condensation and cosolvent dissolution from the precursor cosolvent-infused bubbles. (b) Microscope images of droplets and bubbles (mean diameter = 52.4 μm and CV = 3.5%) embedded in PAA gel after exposure to high-pressure ultrasound, showing the monodispersity of both the converted bubbles and the unconverted droplets (shown in the white inset box). The image was taken 4 min after high-pressure ultrasound exposure. Reproduced from [68] with permission from The Royal Society of Chemistry.