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Related Experiment Video

Updated: Nov 17, 2025

Studying Cavitation Enhanced Therapy

Studying Cavitation Enhanced Therapy

Published on: April 9, 2021

Acoustic cavitation rheometry.

Lauren Mancia¹, Jin Yang², Jean-Sebastien Spratt³

¹Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA. lamancha@umich.edu.

|February 15, 2021

Summary

This summary is machine-generated.

This study introduces acoustic-cavitation-based inertial microcavitation rheometry (IMR) to measure soft material properties. This method accurately characterizes agarose hydrogels at high strain rates without altering material properties.

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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

Published on: April 11, 2014

Area of Science:

Materials Science
Rheology
Acoustics

Background:

Characterizing soft materials like hydrogels is difficult due to their compliance and strain-rate dependent properties.
Existing inertial microcavitation-based high strain-rate rheometry (IMR) uses laser-induced cavitation, which can alter material properties.
High strain-rate rheometry is crucial for understanding material behavior under dynamic conditions.

Purpose of the Study:

To adapt the inertial microcavitation rheometry (IMR) method using acoustic cavitation instead of laser-induced cavitation.
To characterize the viscoelastic properties of agarose hydrogels at high strain rates (10^3 to 10^8 s^-1).
To validate the use of acoustic cavitation and data assimilation for material property measurement.

Main Methods:

Developed an acoustic-cavitation-based IMR technique using high-amplitude focused ultrasound.
Applied the method to 0.3% and 1% agarose hydrogels, measuring bubble radius histories.
Utilized ensemble-based data assimilation to interpret the inferred material properties.

Main Results:

Successfully inferred viscosity, elastic constants, and stress-free bubble radius for agarose hydrogels.
Results were consistent with existing agarose gel data and expected trends for gel concentration and high strain-rate loading.
Demonstrated that acoustic cavitation does not alter material properties during measurement.

Conclusions:

Acoustic-cavitation-based IMR is a viable method for characterizing soft material viscoelastic properties at high strain rates.
The integration of data assimilation enhances the interpretation of rheological measurements from bubble dynamics.
This technique offers a promising alternative for studying material behavior under extreme dynamic conditions without inducing material alteration.