Experimental analysis on the surface oscillation of acoustic liposomes in a standing sound field

Abstract

In the present study, the characteristics of surface oscillation of acoustic liposomes (ALs) in a standing sound field at 110 kHz has been investigated experimentally. The dependence of the bubble radius on the mode and the amplitude of surface oscillation has been analyzed. As the decrease in the bubble radius from 39.28 μm to 26.45 μm, the surface oscillation of the 5th mode to the 3rd mode were observed. It was found that there exists a radius where the amplitude of surface oscillation takes the maximum in each mode. Assuming that the surface oscillation of ALs is caused by the mechanism of parametric excitation by the surface tension model, the surface tension of ALs is estimated to be about 0.03 N/m.