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Crack densification in drying colloidal suspensions.

Paul Lilin1, Mario Ibrahim1, Irmgard Bischofberger1

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Summary
This summary is machine-generated.

Drying colloidal drops form cracks due to internal stresses. Crack spacing depends on deposit thickness, and crack shape relates to the deposit

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physics of Complex Systems

Background:

  • Sessile drops of aqueous colloidal suspensions form close-packed particle deposits as they dry.
  • Evaporation drives radial water flow within the deposit, creating negative pore pressure.
  • This pore pressure generates tensile drying stresses, leading to crack formation.

Purpose of the Study:

  • To rationalize the dynamics of crack propagation and densification during colloidal deposit drying.
  • To establish a relationship between drying stresses, crack formation, and deposit morphology.
  • To understand the energy balance governing fracture dynamics in drying colloidal films.

Main Methods:

  • Analysis of crack propagation and densification dynamics.
  • Application of a local energy balance model.
  • Investigation of the interplay between elastic energy, fracture cost, and pore pressure.

Main Results:

  • Crack density saturates as drying progresses.
  • Final radial crack spacing is proportional to the local deposit thickness.
  • Crack segment aspect ratio is determined by the deposit's overall shape.

Conclusions:

  • The study provides a framework for understanding crack formation in drying colloidal suspensions.
  • The findings offer insights into controlling crack patterns in thin films.
  • This work has implications for fabricating patterned materials and understanding natural drying processes.