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How bulk liquid viscosity shapes capillary suspensions.

Christoph Haessig1, Jasper Landman1, Elke Scholten1

  • 1Physics and Physical Chemistry of Foods, Wageningen University, PO Box 17, 6700 AA Wageningen, the Netherlands.

Journal of Colloid and Interface Science
|September 10, 2024
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Summary
This summary is machine-generated.

Altering bulk liquid viscosity in capillary suspensions impacts material properties. Higher viscosity weakens the structure by causing liquid bridges to break sooner, reducing strength and yield stress.

Keywords:
Capillary bridgesCapillary suspensionsColloidal suspensionsGelViscosity

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Area of Science:

  • Materials Science
  • Colloid Science
  • Rheology

Background:

  • Capillary suspensions are ternary liquid-liquid-solid systems.
  • Particles are linked by liquid bridges within a second immiscible fluid.
  • Bulk liquid viscosity is a key parameter for tuning properties.

Purpose of the Study:

  • Investigate the effect of bulk liquid viscosity on capillary suspension structure and rheology.
  • Understand the relationship between viscosity, network connectivity, and mechanical properties.
  • Utilize experiments and simulations for comprehensive analysis.

Main Methods:

  • Experimental investigation of capillary suspensions with silica particles and water.
  • Modulation of bulk liquid viscosity using mixtures (dodecane/diisononyl phthalate) and silicone oils.
  • Rheological characterization (storage/loss moduli, yield stress).
  • Confocal laser scanning microscopy for structural visualization.
  • Molecular Dynamics (MD) simulations for particle-bridge interactions.

Main Results:

  • Increased bulk liquid viscosity decreased suspension strength, yield stress, and yield strain.
  • Higher viscosity led to reduced inter-connectivity of the particle network.
  • Numerical simulations indicated earlier liquid bridge breakup with increasing viscosity.
  • Structural analysis correlated rheological changes with network alterations.

Conclusions:

  • Bulk liquid viscosity is a critical factor in controlling capillary suspension mechanics.
  • Viscosity-induced changes in liquid bridge stability and network structure dictate material response.
  • The findings provide insights for designing novel materials with tailored rheological properties.