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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal polycrystalline monolayers under oscillatory shear.

Ivo Buttinoni1, Mathias Steinacher1, Hendrik Th Spanke1

  • 1Laboratory for Interfaces, Soft Matter and Assembly, Department of Materials, ETH Zurich, CH-8093, Zurich, Switzerland.

Physical Review. E
|February 18, 2017
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Summary
This summary is machine-generated.

Large strains fluidize soft colloidal systems, while smaller strains promote crystal growth by annealing defects. Rearrangements occur in regions with high deviatoric stress, minimizing stored stress.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Materials Science

Background:

  • The mechanical response of soft materials depends heavily on their microstructure.
  • Disordered jammed materials present challenges in identifying plastic rearrangement regions compared to crystalline materials.
  • Polycrystalline monolayers of soft repulsive colloids offer a model system between crystalline and jammed states.

Purpose of the Study:

  • To investigate the structural response of colloidal monolayers to oscillatory shear.
  • To understand the relationship between microstructure, deformation, and mechanical properties.
  • To identify pathways for structural evolution under shear.

Main Methods:

  • Confining soft repulsive colloidal monolayers at a fluid interface.
  • Applying oscillatory shear deformations using a magnetic microdisk.
  • Imaging particle behavior with optical microscopy.
  • Utilizing numerical simulations to analyze particle stresses.

Main Results:

  • Large strains were found to fluidize the system, correlating with a local Lindemann criterion.
  • Smaller strains induced localized particle rearrangements and defect annealing, promoting crystalline domain growth.
  • Numerical simulations identified rearranging particles with high deviatoric stresses, localized near grain boundaries and defects.
  • Structural evolution was observed to minimize the stored stress within the system.

Conclusions:

  • Oscillatory shear in colloidal monolayers can lead to either fluidization or defect-driven crystalline growth depending on strain amplitude.
  • Deviatoric stress is a key indicator for predicting plastic rearrangement regions in these systems.
  • The study provides insights into the microstructural mechanisms governing the mechanical behavior of soft materials.