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Related Experiment Videos

Stability of an encapsulated bubble shell.

Boris Krasovitski1, Eitan Kimmel

  • 1The Department of Biomedical Engineering, Technion, Haifa 32000, Israel. agboris@tx.technion.ac.il

Ultrasonics
|January 4, 2006
PubMed
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This study models encapsulated gas bubble stability, considering gas diffusion and shell properties. It identifies critical radii for bubble collapse, influenced by surface tension and shell stiffness, crucial for ultrasound contrast agents.

Area of Science:

  • Biophysics
  • Materials Science
  • Fluid Dynamics

Background:

  • Encapsulated gas bubbles are vital for medical imaging, particularly as ultrasound contrast agents.
  • Understanding bubble stability is crucial for optimizing their performance and predicting lifespan.
  • Gas diffusion and mechanical properties of the shell significantly influence bubble behavior.

Purpose of the Study:

  • To develop a mechanistic model for encapsulated bubble stability considering gas diffusion.
  • To investigate the interplay between shell stiffness and surface tension in determining bubble mechanical stability.
  • To predict bubble size ranges susceptible to collapse over time.

Main Methods:

  • A mechanistic model incorporating shell stiffness and surface tension was developed.

Related Experiment Videos

  • A technique adapted for small radii was used to derive a critical shell radius for mechanical instability.
  • A new parameter was defined to quantify the relative importance of surface tension and shell stiffness.

    • Main Results:

    • A critical shell radius for mechanical instability was derived.
    • A new parameter highlights the balance between surface tension and shell stiffness.
    • Surface tension dominates critical radius determination but negligibly affects minimal collapse radius.
    • The model predicts bubble populations and gas saturation levels that lead to collapse.

    Conclusions:

    • The study provides a predictive framework for encapsulated bubble collapse based on physical parameters.
    • Surface tension plays a dominant role in initial stability loss, while shell stiffness is also critical.
    • The findings are relevant for the design and application of ultrasound contrast agents like Optison.