Microbubble-based measurement of shear and loss moduli in polyacrylamide hydrogels at MHz frequencies
Abstract
. Narrow resonance curves of single coated microbubbles embedded in PAM, obtained through high-speed imaging, were compared to a Rayleighâ€"Plesset-type model. The results show that the shear modulus is similar in both the Hz and MHz regimes, while the loss modulus behaves very differently, exhibiting an effective shear viscosity at MHz frequencies comparable to that of water. These findings demonstrate a new approach for probing the high-frequency rheology of viscoelastic media.
Fields of Study & Subjects
Ultrasound and Hyperthermia Applications
Ultrasound and Cavitation Phenomena
Ultrasound Imaging and Elastography
Publication details
- Journal / source
- Soft Matter
- Publisher
- Royal Society of Chemistry (RSC)
- Volume
- 22
- Issue
- 3
- Pages
- 763–772
- Publication date
- 1 January 2026
- Language
- EN