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Related Experiment Videos

Why do drying films crack?

Wai Peng Lee1, Alexander F Routh

  • 1Department of Chemical and Process Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 3, 2004
PubMed
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Cracks in drying films are caused by capillary pressures from moving particle fronts. This new scaling explains crack spacing across various conditions, aiding in controlling film failure.

Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Chemistry

Background:

  • Film failure during drying is a critical phenomenon.
  • Previous models for crack spacing relied on energy balance assumptions.
  • Understanding drying-induced failure mechanisms is essential for material control.

Purpose of the Study:

  • To introduce a new scaling law for crack spacing in drying dispersions.
  • To identify the primary cause of failure in drying films.
  • To provide a framework for controlling film integrity during drying.

Main Methods:

  • Developed a new scaling relationship for crack spacing.
  • Analyzed crack spacing data across varied experimental conditions.
  • Investigated the role of solvent flow and capillary stress.

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Main Results:

  • The new scaling law successfully collapses data for diverse evaporation rates, film thicknesses, particle sizes, and materials.
  • Identified horizontal particle front movement as a key factor.
  • Demonstrated that capillary pressures induced by these fronts cause film failure.

Conclusions:

  • Capillary pressures generated by travelling particle fronts are the main drivers of failure in drying films.
  • The new scaling provides a predictive tool for crack spacing.
  • This research offers insights into preventing or managing film defects during drying.