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A hovering bubble with a spontaneous horizontal oscillation.

Man Hu1, Yuqi Li1, Li Chen1

  • 1Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China.

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|October 24, 2024
PubMed
Summary
This summary is machine-generated.

Researchers created an active bubble that oscillates horizontally on a liquid surface using a laser. This controlled oscillation has potential for microrobots and drug delivery applications.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Active matter exhibits complex motions crucial for engineering and biological systems.
  • Typically, active objects require symmetry-broken structures, compositions, or interfacial activities.
  • Understanding novel active matter systems is key to advancing technology.

Purpose of the Study:

  • To report a novel active bubble system with spontaneous horizontal oscillation.
  • To investigate the physical mechanism behind the bubble's synchronized oscillation.
  • To explore controllable oscillation directions and potential applications.

Main Methods:

  • Impacting a stationary laser beam into a liquid through a transparent solid cover.
  • Observing and analyzing spontaneous bubble oscillation at the solid/liquid interface.
  • Conducting scaling analysis of oscillation frequency and bubble trajectory.

Main Results:

  • A spontaneously oscillating active bubble was generated at the solid/liquid interface.
  • Bubble oscillation synchronized with interfacial temperature and hydrodynamic flow.
  • Azimuthal rotation of bubble trajectory observed due to symmetry breaking.
  • Demonstrated a controllable double pendulum system of oscillating bubbles.

Conclusions:

  • The study presents a new physical mechanism for active bubble generation and oscillation.
  • Findings advance the understanding of active matter and its multi-mode motions.
  • Highlights potential applications in microrobots, drug delivery, and other bubble-mediated technologies.