Buckling resistance of solid shell bubbles under ultrasound
Journal of the Acoustical Society of America , Volume 129 - Issue 3 p. 1231- 1239
Thin solid shell contrast agents bubbles are expected to undergo different volume oscillating behaviors when the acoustic power is increased: small oscillations when the shell remains spherical, and large oscillations when the shell buckles. Contrary to bubbles covered with thin lipidic monolayers that buckle as soon as compressed: the solid shell bubbles resist compression, making the buckling transition abrupt. Numerical simulations that explicitly incorporate a shell bending modulus give the critical buckling pressure and post-buckling shape, and show the appearance of a finite number of wrinkles. These findings are incorporated in a model based on the concept of effective surface tension. This model compares favorably to experiments when adjusting two main parameters: the buckling tension and the rupture shell tension. The buckling tension provides a direct estimation of the acoustic pressure threshold at which buckling occurs.
|Journal of the Acoustical Society of America|
|Organisation||Erasmus MC: University Medical Center Rotterdam|
Marmottant, P, Bouakaz, A, de Jong, N, & Quilliet, C. (2011). Buckling resistance of solid shell bubbles under ultrasound. Journal of the Acoustical Society of America, 129(3), 1231–1239. doi:10.1121/1.3543943