With most of the world still struggling to deal with the health crisis and more contagious variants of the virus spreading or yet to emerge, Japan is facing a tough problem.
Scientists from Tokyo Metropolitan University have unraveled how liquid foams collapse by visualizing individual collapse “events” using high-speed video microscopy.
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IMAGE: An initial crack in a film creates a RVPB (a). A second crack event in the film (b) causes a collapse front to be formed which sweeps up the RVPB. view more
Credit: Tokyo Metropolitan University
Tokyo, Japan - Researchers from Tokyo Metropolitan University have revealed how liquid foams collapse by observing individual collapse events with high-speed video microscopy. They found that cracks in films led to a receding liquid front which sweeps up the original film border, inverts its shape, and releases a droplet which hits and breaks other films. Their observations and physical model provide key insights into how to make foams more or less resistant to collapse.
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IMAGE: A rearrangement event in a monodisperse foam. Note how bubbles move in the same direction along the same row, or in exactly the opposite direction in adjacent rows over long. view more
Credit: Tokyo Metropolitan University
Tokyo, Japan - Researchers from Tokyo Metropolitan University studied the dynamics of foams. When a drop of water was added to a foam raft, the bubbles rearranged themselves to reach a new stable state. The team found that bubble movement was qualitatively different depending on the range of bubble sizes present. Along with analogies with soft-jammed materials, these findings may inspire the design of new foam materials for industry.
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