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Figure 2

From: Inertial cavitation of lyophilized and rehydrated nanoparticles of poly(L-lactic acid) at 835 kHz and 1.8 MPa ultrasound

Figure 2

Acoustic response of different nanodispersions on insonation at 835 kHz and 1.8 MPa in the ultrasound test device. The results are given as plots of the voltage spectral density [V/(Hz)1/2], versus time [s] for the replicate individual samples. (a) Left-hand frame: Rehydrated nanodispersions, either non-filtered (dark blue) or filtered (brown). (b) Right-hand frame: Polystyrene nanospheres of diameter 300 nm,10% w/v in water; and Optison microbubbles in water.

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