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Pattern formation in drying drops

Deegan1

  • 1James Franck Institute, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 25, 2000
PubMed
Summary

Evaporating liquid drops can self-pin their edges, leading to ring formation. This self-pinning, combined with dewetting, creates complex deposit patterns like cellular structures and Sierpinski gaskets.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Pattern formation

Background:

  • Ring formation in evaporating sessile drops is a common phenomenon.
  • Solids in the drop move to the edge (contact line) during evaporation.
  • A ring-shaped deposit remains after the liquid fully evaporates.

Purpose of the Study:

  • To investigate the role of the drop itself in initiating ring formation.
  • To explore pattern generation driven by self-induced contact line pinning and dewetting.

Main Methods:

  • Hydrodynamic analysis of evaporating sessile drops.
  • Investigation of self-induced contact line pinning mechanisms.
  • Study of pattern formation resulting from dewetting and pinning competition.

Main Results:

  • The evaporating drop can inherently generate contact line pinning.
  • Self-induced pinning, without external factors, leads to diverse deposit patterns.
  • Observed patterns include cellular, lamellar, sawtooth, and Sierpinski gasket structures.

Conclusions:

  • Self-induced pinning is a crucial factor in ring formation.
  • The interplay between dewetting and self-induced pinning drives complex pattern formation in evaporating drops.

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