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Liquid membranes can self-heal ultrafast after impact. Researchers identified critical impact speeds and scaling laws, revealing healing occurs before thinning, defining the operational self-healing regime.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Soft matter physics

Background:

  • Liquid membranes, like soap films, possess self-healing capabilities after impact.
  • Key parameters and thresholds for self-healing versus rupture remain unestablished.

Purpose of the Study:

  • Establish scaling relationships for self-healing time and critical impact speed in liquid membranes.
  • Define the operational regime and practical limits for self-healing in liquid membranes.

Main Methods:

  • Conducted nearly 1000 impact tests using spheres of varying size, speed, and wettability.
  • Analyzed healing dynamics, including cavity formation, pinch-off, and thinning.
  • Derived scaling relationships based on experimental data.

Main Results:

  • Self-healing occurs via cavity formation and pinch-off, driven by surface tension.
  • Successful healing requires closure to outpace impact-induced thinning.
  • Healing timescales are sub-millisecond to milliseconds, significantly faster than solid self-healing.
  • A critical Weber number (We_critical ≈ 13,052) was identified as the upper limit for self-healing.

Conclusions:

  • Liquid membranes represent an ultrafast self-healing material class.
  • The study defines the operational self-healing regime and practical limits for liquid membranes.
  • Findings are crucial for applications requiring robust self-healing functionality.