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Area of Science:

  • Colloidal Science
  • Materials Science
  • Rheology

Background:

  • Colloidal pastes exhibit plasticity and memory of motion, influencing desiccation crack patterns.
  • Calcium carbonate (CaCO3) paste shows vibrational memory but lacks flow memory due to interparticle repulsion.
  • Desiccation crack morphology is dictated by the paste's memory effects.

Purpose of the Study:

  • To investigate methods for controlling CaCO3 paste memory effects using polysaccharides.
  • To quantify paste memory anisotropy using Shannon's information entropy.
  • To understand the role of polysaccharide concentration on CaCO3 paste memory.

Main Methods:

  • Image analysis using Shannon's information entropy to quantify crack pattern anisotropy.
  • Experimental addition of varying polysaccharide concentrations to CaCO3 paste.
  • Flocculation and sedimentation experiments to study interparticle interactions.

Main Results:

  • Small polysaccharide additions to CaCO3 paste induced flow memory by promoting network formation.
  • Large polysaccharide additions eliminated both flow and vibrational memory effects.
  • Polysaccharide concentration influenced CaCO3 colloidal particle flocculation and sedimentation rates.

Conclusions:

  • Polysaccharides can be used to tune the memory effects of CaCO3 paste.
  • Polymer bridging at low concentrations facilitates flow memory, while high concentrations induce repulsion and eliminate memory.
  • Understanding these effects is crucial for controlling crack patterns in drying colloidal systems.