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Polygonal Wrinkles in a Soft Solidified Droplet.

Li Chen1, Cheng Cao1, Yuqi Li1

  • 1Department of Aeronautics and Astronautics & College of Intelligent Robotics and Advanced Manufacturing, Fudan University, Shanghai 200433, China.

Nano Letters
|June 11, 2025
PubMed
Summary

Soft solidified droplets exhibit self-folding and polygonal wrinkling. The thin film

Keywords:
Elasto-capillarity effectPolygonal wrinklesSoft solidified dropletSupercooling

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Phase Change Phenomena

Background:

  • Liquid freezing impacts materials science and manufacturing.
  • Solidified liquids resist deformation, complicating thin-film mechanics.
  • Understanding freezing patterns is crucial for advanced applications.

Purpose of the Study:

  • Investigate the mechanical behavior of solidified droplets.
  • Analyze pattern formation during droplet freezing.
  • Explore the transition of polygonal wrinkles in thin films.

Main Methods:

  • Studied hexadecane droplet impact on an aluminum substrate.
  • Applied strong supercooling conditions.
  • Utilized scaling analysis and numerical simulations.

Main Results:

  • Observed self-folding and polygonal wrinkling in solidified droplets.
  • Documented a sequential transformation of wrinkles from octagonal to tetragonal.
  • Found excellent agreement between simulations and experimental observations.

Conclusions:

  • Soft solidified droplets can form complex, transforming polygonal wrinkles.
  • Gauss's theorema egregium governs the wrinkling patterns.
  • This phenomenon offers insights into thin-film mechanics and pattern formation.