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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Stacked Rayleigh-Taylor Instabilities Grow Drops into Soft Stalactitelike Structures.

Barath Venkateswaran1, Trevor J Jones2, Grace Kresge3

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Researchers created "flexicles," unique corrugated structures, by repeatedly coating, flowing, and solidifying liquid elastomer. This process reveals a fascinating interplay between fluid dynamics and solidification, leading to ordered yet chaotic patterns in elastic solids.

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Area of Science:

  • Geophysical fluid dynamics
  • Materials science
  • Soft matter physics

Background:

  • Thin film hydrodynamics and solidification create complex natural structures like stalactites and icicles.
  • Rayleigh-Taylor instability in Newtonian fluid films on surfaces yields drop lattices.
  • The solidification of thin films and its effect on interfacial instabilities are less understood.

Purpose of the Study:

  • To investigate pattern formation in solidifying thin elastomer films.
  • To explore the iterative coat-flow-cure process for creating novel structures.
  • To analyze the structure, shape, arrangement, and deformability of the resulting corrugated structures, termed "flexicles".

Main Methods:

  • Coating the underside of a flat surface with liquid elastomer.
  • Allowing the liquid film to destabilize and flow under gravity while curing into an elastic solid.
  • Iteratively repeating the coat-flow-cure process to build corrugated structures.

Main Results:

  • The iterative process generates arrays of solid droplets from initial film destabilization.
  • Subsequent iterations lead to the formation of corrugated slender structures named "flexicles" by the authors.
  • The study analyzes the interplay of order and chaos in flexicle formation and properties.

Conclusions:

  • The coat-flow-cure process offers a method for creating intricate, deformable structures from solidifying thin films.
  • Flexicles exhibit a unique combination of order and chaos in their morphology and arrangement.
  • Understanding these structures provides insights into geophysical pattern formation and soft matter physics.