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Updated: Dec 6, 2025

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Ultrasound can make bubbles move in yield-stress fluids like Carbopol. However, bubble release from this material requires high acoustic pressures, leading to erratic motion rather than controlled release.

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Area of Science:

  • Rheology
  • Acoustic Physics
  • Soft Matter Physics

Background:

  • Yield-stress fluids trap bubbles when buoyancy forces are below the material's yield stress.
  • Acoustic excitation can induce bubble oscillations, potentially triggering yielding and aiding bubble release.

Purpose of the Study:

  • Investigate microbubble oscillation and translation in Carbopol microgel under ultrasound.
  • Analyze linear and non-linear bubble dynamics to understand material properties and release mechanisms.

Main Methods:

  • Analysis of linear bubble oscillation dynamics to determine high-frequency viscosity.
  • Induction of bubble translation using acoustic pressure gradients to study elastic response.
  • Observation of bubble behavior at varying acoustic pressure amplitudes.

Main Results:

  • Linear oscillations provided insights into the material's high-frequency viscosity.
  • Moderate acoustic pressures did not induce irreversible bubble motion or release.
  • High acoustic pressures caused non-spherical shape oscillations and erratic bubble motion, differing from theoretical predictions.

Conclusions:

  • Carbopol microgel exhibits complex bubble dynamics under ultrasound.
  • Bubble release is challenging and requires high pressures, leading to unpredictable motion.
  • Findings inform potential applications of ultrasound in manipulating bubbles in soft materials.