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Reshaping sub-millimetre bubbles from spheres to tori.

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Researchers created sub-millimetre bubbles that rapidly change shape and topology from sphere to torus using pressure. These protein-stabilized bubbles offer new possibilities for materials science and surface mechanics research.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Surface Mechanics

Background:

  • Shape-changing materials are crucial for advanced applications in acoustics and robotics.
  • Controlling the topology of materials, in addition to their shape, presents unique challenges and opportunities.

Purpose of the Study:

  • To report the creation of sub-millimetre bubbles capable of reversible topological transformations.
  • To investigate the mechanism enabling rapid shape and topological changes in these bubbles.
  • To explore potential applications in materials science and surface mechanics.

Main Methods:

  • Fabrication of sub-millimetre bubbles stabilized by a solid-like protein nanoparticle film.
  • Application of controlled pressure treatments to induce shape and topological changes.
  • Microscopic observation and analysis of bubble morphology and protein expulsion.

Main Results:

  • Demonstrated reversible transitions between spherical and toroidal topological classes in the bubbles.
  • Observed stable toroidal bubble forms persisting for several days, often matching Clifford torus dimensions.
  • Identified protein expulsion as the key mechanism for enabling rapid topological class crossing.

Conclusions:

  • Sub-millimetre protein-stabilized bubbles can rapidly and reversibly change topological class via pressure treatment.
  • This rapid topological transformation capability offers advantages over existing methods for studying surface mechanics.
  • The findings suggest novel pathways for developing lightweight materials with high surface areas.