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Changes in microbubble dynamics upon adhesion to a solid surface.

Jordan S Lum1, Verya Daeichin, Daniel F Kienle2

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|April 2, 2020
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Summary
This summary is machine-generated.

Surface adhesion significantly increases microbubble resonance frequency, contrary to expectations. This finding suggests adhesion effects dominate acoustic influences in microbubble behavior near surfaces.

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Area of Science:

  • Acoustic physics
  • Materials science
  • Biophysics

Background:

  • Microbubble-surface interactions are crucial for ultrasound imaging and therapy.
  • Previous studies indicated rigid boundaries decrease microbubble resonance frequency.
  • The behavior of adherent microbubbles requires further investigation.

Purpose of the Study:

  • To investigate the acoustic response of lipid-coated microbubbles adherent to a rigid surface.
  • To determine how surface adhesion affects microbubble resonance frequency and oscillation dynamics.
  • To compare the influence of adhesion versus acoustic effects on microbubble behavior.

Main Methods:

  • Achieving firm microbubble adhesion using specific (biotin/avidin) and nonspecific (lipid/glass) interactions.
  • Utilizing total internal reflection fluorescence microscopy to confirm adhesion conditions.
  • Employing a photoacoustic technique to drive individual microbubbles and measure sub-nanometer radial oscillations.

Main Results:

  • Adherent microbubbles exhibited a higher resonance frequency compared to non-adherent ones.
  • Analysis revealed surface adhesion stiffens the microbubble, increasing shell elasticity.
  • Adhesion also led to a decrease in shell viscosity.

Conclusions:

  • Surface adhesion is a dominant factor influencing microbubble oscillations at low amplitudes.
  • Contrary to previous findings, adhesion enhances microbubble resonance frequency.
  • These results have implications for optimizing microbubble applications in ultrasound technologies.