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Restructuring and aging in a capillary suspension.

Erin Koos1, Wolfgang Kannowade1, Norbert Willenbacher1

  • 1Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology (KIT), Straße am Forum 8, 76131 Karlsruhe, Germany.

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Summary
This summary is machine-generated.

Capillary suspensions exhibit unique aging and restructuring behaviors distinct from other gels. Their response to oscillatory shear is highly sensitive, indicating network rearrangement and rupture under deformation.

Keywords:
AgingCapillary forceCapillary suspensions

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Area of Science:

  • Materials Science
  • Rheology
  • Colloid Science

Background:

  • Capillary suspensions, containing a small amount of immiscible fluid, exhibit significantly altered rheological properties.
  • These suspensions differ from particulate gels, which are primarily influenced by van der Waals forces.

Purpose of the Study:

  • To investigate the aging and restructuring dynamics of a model capillary suspension.
  • To understand the network's response to rest conditions and external shear deformation.

Main Methods:

  • Utilized a model system of calcium carbonate suspended in silicone oil with added water (11% solids).
  • Applied oscillatory shear deformation to probe the linear viscoelastic regime and aging behavior.

Main Results:

  • Capillary suspensions demonstrated power-law aging behavior, sensitive to oscillatory flow, with the linear viscoelastic regime ending at 0.1% deformation.
  • Aging persisted longer at low deformations but decreased in strength at higher deformations, suggesting network rearrangement and rupture.
  • Unlike oscillatory shear, shear flow required high shear rates to rupture agglomerates, returning viscosity to that of pure van der Waals suspensions.

Conclusions:

  • The rheological response of capillary suspensions is highly sensitive to oscillatory flow, differing significantly from van der Waals-dominated systems.
  • Aging in these suspensions is influenced by deformation magnitude and duration, indicating a dynamic network structure.
  • A transitional region exists at intermediate water content, where material response is strongly dependent on external forcing characteristics.