Figure 6.

Maximum relative microbubble expansion, defined as the normalized maximum diameter (D_max/D₀), as a function of initial diameter D₀ for individual microbubbles insonicated at (a) 0.5 MPa and (b) 1.0 MPa, situated in either (circles) 1 cP or (squares) 4 cP fluid. Open symbols refer to microbubbles that have fragmented into smaller microbubbles, and in this case the relative expansion is calculated from the maximum diameter prior to fragmentation. Closed symbols denote microbubbles that do not fragment. Note that all microbubbles situated in 1 cP fluid undergo fragmentation at these pressures (see Figure 4).