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Capillary force-driven particle orientation in rod networks.

Lingyue Liu1, Sebastian Gassenmeier1, Erin Koos1

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Summary
This summary is machine-generated.

Anisotropic rod particles in capillary suspensions form complex networks that change structure and rheology with liquid content. These findings enable the design of advanced materials with tunable mechanical properties.

Keywords:
Anisotropic particleCapillary suspensionNetwork structureRheologyYielding

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Rheology

Background:

  • Anisotropic particles, like rods, exhibit unique network structures and rheological behaviors in capillary suspensions compared to spheres.
  • Understanding particle orientation is crucial for predicting bulk properties.

Purpose of the Study:

  • To investigate the microstructural and rheological changes in capillary suspensions of glass microrods as a function of secondary liquid volume fraction.
  • To correlate particle network characteristics (coordination number, clustering, orientation) with macroscopic rheological properties.

Main Methods:

  • Dispersion of glass microrods in capillary suspensions with varying secondary liquid volume fractions.
  • Analysis of microstructure using confocal microscopy.
  • Rheological property measurements via rheometry and rheoconfocal techniques.
  • Quantification of particle networks: coordination number, clustering coefficient, orientation distribution.

Main Results:

  • Increased secondary liquid fraction shifted rod networks from point-to-point contacts to side-to-side aligned clusters.
  • The average clustering coefficient decreased with increasing coordination number, indicating complex cluster formation.
  • Rod networks showed increased sensitivity to deformation; higher side-to-side contact probability correlated with greater viscoplastic fragility.

Conclusions:

  • The study reveals a transition in anisotropic particle network structures and rheology with changing liquid content.
  • Findings provide a basis for engineering advanced materials with tunable mechanical properties by controlling anisotropic particle interactions in capillary suspensions.