Ultra-long lifetime water bubbles stabilized by negative pressure generated between microparticles.

Area of Science:

• Fluid dynamics
• Materials science
• Surface science

Background:

• Bubbles typically burst within seconds due to gravity, surface tension, and evaporation.
• Existing methods to extend bubble lifetime have limitations in preventing film thinning and evaporation effects.

Purpose of the Study:

• To investigate a novel method for significantly extending the lifetime of water bubbles.
• To elucidate the underlying physical mechanism responsible for enhanced bubble stability.

Main Methods:

• Experimental observation of centimeter-scale water bubbles covered with microparticles.
• Theoretical modeling using Surface Evolver for numerical computation.
• Three-dimensional fluorescence experiments to visualize water transfer.

Main Results:

• Centimeter-scale water bubbles covered with microparticles achieved lifetimes exceeding one month at room temperature.
• A stability mechanism involving negative pressure within the bubble film was identified.
• This negative pressure, generated by surface tension over microparticles, counteracts evaporation and gravity by drawing water from the bulk.

Conclusions:

• Microparticle coating on bubble surfaces enables ultra-long bubble lifetimes by self-adaptively compensating for water loss.
• The discovered mechanism is applicable to various liquids and particles meeting specific contact angle criteria.
• This finding opens new possibilities for creating exceptionally stable bubbles.