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Dynamics of cracking in drying colloidal sheets.

Rajarshi Sengupta1, Mahesh S Tirumkudulu

  • 1Department of Chemical Engineering, Indian Institute of Technology Powai, Mumbai, India. mahesh@che.iitb.ac.in.

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|March 1, 2016
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Summary
This summary is machine-generated.

Drying polymer-particle dispersions form cracks. Critical cracking stress depends on film thickness, and crack velocity is influenced by energy release, surface energy, fluid dissipation, and kinetic energy.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Fracture Mechanics

Background:

  • Colloidal dispersions form intricate crack networks upon drying.
  • Understanding the fracture mechanics of these drying films is crucial for material design.

Purpose of the Study:

  • To investigate the fracture mechanics of free-standing films of aqueous polymer-particle dispersions during drying.
  • To quantify the relationship between film thickness and critical cracking stress.
  • To model and measure the velocity of crack propagation.

Main Methods:

  • Casting thin films of polymer-particle dispersions between steel wires.
  • Measuring the deflection of wires to calculate stress during drying.
  • Observing and measuring crack velocities in drying films.

Main Results:

  • Critical cracking stress was found to vary inversely with the two-thirds' power of film thickness.
  • Crack motion was modeled considering elastic energy release, surface energy increase, viscous dissipation, and kinetic energy.
  • Experimental crack velocities showed fair agreement with model predictions.

Conclusions:

  • The study provides quantitative insights into the fracture mechanics of drying colloidal films.
  • The findings contribute to understanding crack formation and propagation in polymer-particle dispersions.
  • The developed model offers a framework for predicting crack behavior in such systems.