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Related Experiment Videos

Dewetting Patterns in a Drying Liquid Film.

Leonard W. Schwartz1, R. Valery Roy, Richard R. Eley

  • 1Departments of Mechanical Engineering and Mathematical Sciences, The University of Delaware, Newark, Delaware, 19716

Journal of Colloid and Interface Science
|February 13, 2001
PubMed
Summary

This study investigates liquid coating failures, termed reticulation, on substrates with high contact angles. Mathematical models and experiments reveal how evaporation and liquid properties drive defect pattern formation during drying.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Chemistry

Background:

  • Liquid coatings often fail to form continuous films on substrates with high equilibrium contact angles.
  • This phenomenon, known as reticulation, results in defect patterns, perforations, dewetting, and droplet formation, impacting industrial applications.

Purpose of the Study:

  • To present a comprehensive mathematical and experimental investigation of liquid coating reticulation.
  • To model and understand the mechanisms driving defect pattern formation during the drying of liquid films.

Main Methods:

  • Utilized a disjoining-conjoining pressure model incorporating substrate energetics.
  • Employed the small-slope (lubrication) approximation and included evaporation and drying effects.
  • Modeled a two-component liquid with viscosity dependent on nonvolatile mixture fraction.

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Main Results:

  • Linear analysis predicted a most-unstable wavelength and growth rate, showing approximate agreement with modeling.
  • Nonlinear model computations demonstrated diverse pattern formation during liquid drying.
  • Numerical simulations, initiated with small experimental defects, reproduced observed reticulation patterns qualitatively and quantitatively.

Conclusions:

  • The study provides a robust theoretical and numerical framework for understanding liquid coating reticulation.
  • The findings offer insights into the complex pattern formation driven by substrate-liquid interactions and drying dynamics.
  • The developed model accurately predicts and replicates experimental observations of coating defects.