  Ultrasound contrast agents comprise gas microbubbles surrounded by
stabilising elastic or viscoelastic shells. Microbubbles containing liquid or
solid cores are referred to as antibubbles. The manufacturing process of
long-lived antibubbles involves the adsorption of colloidal particles at the
interfaces, a process called Pickering stabilisation. With and without cores
present inside, Pickering-stabilised microbubbles generate a harmonic response,
even at modest transmission amplitudes. Therefore, Pickering-stabilised
ultrasound contrast agents may be of interest in contrast-enhanced ultrasonic
imaging. In a previous study, we determined that the presence of a core inside
Pickering-stabilised microbubbles slightly hampered the oscillation amplitude
compared to identical microbubbles without a core. The purpose of the present
study is to determine whether the absence of a core negatively influences the
stability of Pickering-stabilised microbubbles under sonication.
