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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Delamination and out-of-plane deformation in drying colloidal suspensions.

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Drying colloidal suspensions form 3D structures due to internal stresses. This study reveals that radial, not vertical, pressure gradients drive buckling and curvature in thin films, contradicting prior models.

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Area of Science:

  • Materials Science
  • Physics
  • Fluid Dynamics

Background:

  • Colloidal suspensions form solid deposits upon drying.
  • Drying-induced pore pressure gradients cause shrinkage, stress, cracking, and delamination.
  • Previous models linked out-of-plane deformation to through-thickness pore pressure gradients.

Purpose of the Study:

  • To investigate the mechanism driving out-of-plane deformation in drying colloidal deposits.
  • To challenge existing hypotheses regarding pore pressure gradients.
  • To establish a new model explaining the observed buckling behavior.

Main Methods:

  • Utilized interference and confocal microscopy to observe deposit formation and deformation.
  • Developed and employed non-Euclidean plate simulations for validation.
  • Analyzed the relationship between deposit thickness and curvature.

Main Results:

  • Demonstrated that final curvature is strongly dependent on deposit thickness, with thinner deposits exhibiting greater curvature.
  • Contradicted the hypothesis that vertical pore pressure gradients drive deformation.
  • Identified radial pore pressure gradients as the primary driver of in-plane differential shrinkage and subsequent buckling.

Conclusions:

  • The out-of-plane buckling of drying colloidal deposits is driven by radial, not vertical, pore pressure gradients.
  • In-plane differential shrinkage leads to geometric frustration, resolved by buckling.
  • The proposed mechanism accurately reproduces experimental observations and thickness dependence.