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Mean particle size distributions measured for oxygen nanobubbles, argon nanobubbles and oxygenated water by (a) SPOS and (b) DLS. Error bars indicate the standard deviation in each measurement (n = 9; 3 readings containing 10 runs from 3 samples of each liquid). Panels (c) and (d) show transmission electron micrographs of a sample from the oxygen nanobubble suspension indicating the presence of nanoscale particles (scale bar in (c) is 2 μm, in (d) 200 nm).
