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Drying paint: from micro-scale dynamics to mechanical instabilities.

Lucas Goehring1,2, Joaquim Li2, Pree-Cha Kiatkirakajorn2

  • 1School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK lucas.goehring@ntu.ac.uk.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|April 5, 2017
PubMed
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This study models drying colloidal films to understand particle concentration and mechanical instabilities. Researchers predict and experimentally validate how shear-banding and fracture can be controlled in these complex systems.

Area of Science:

  • Colloid science
  • Materials science
  • Soft matter physics

Background:

  • Charged colloidal dispersions are vital in paints, coatings, and cosmetics.
  • Drying these dispersions leads to particle concentration and mechanical instabilities due to internal pressures.

Purpose of the Study:

  • To model and predict concentration gradients in drying colloidal films.
  • To investigate the microscopic physics governing macroscopic instabilities like shear-banding and fracture.
  • To explore methods for controlling these instabilities.

Main Methods:

  • Pairing an advection-diffusion model with a Poisson-Boltzmann cell model.
  • Osmotic compression experiments on colloidal silica.
  • Small-angle X-ray scattering on silica dispersions drying in Hele-Shaw cells.
Keywords:
colloidsdryingfractureshear bandssmall-angle X-ray scatteringsolidification

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Main Results:

  • Successfully predicted concentration gradients in drying colloidal films.
  • Validated model predictions through experimental osmotic compression and X-ray scattering.
  • Identified links between microscopic physics and macroscopic instabilities.

Conclusions:

  • The study provides a framework for understanding and controlling mechanical instabilities in drying colloidal films.
  • Insights into shear-banding and fracture control can benefit material design.
  • This work advances the understanding of complex media patterning through instabilities.