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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Correlation between crystalline order and vitrification in colloidal monolayers.

Elisa Tamborini1, C Patrick Royall, Pietro Cicuta

  • 1Institut Lumière Matière, Université Lyon 1, 69100 Villeurbanne, France. Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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Summary
This summary is machine-generated.

Polydispersity in colloidal hard discs reveals that local hexagonal order correlates with slower dynamics, but dynamic heterogeneity and structural order do not scale together near the glass transition.

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Area of Science:

  • Soft matter physics
  • Colloidal systems
  • Glass transition physics

Background:

  • Understanding dynamical arrest is crucial for soft matter systems.
  • Local structure influences macroscopic properties in colloidal suspensions.
  • Polydispersity is used to prevent crystallization in model systems.

Purpose of the Study:

  • To experimentally investigate the link between local structure and dynamical arrest.
  • To explore the nature of dynamical heterogeneity in a quasi-2D colloidal system.
  • To determine how structural order and dynamic heterogeneity scale near the glass transition.

Main Methods:

  • Utilizing a quasi-2D colloidal model system approximating hard discs.
  • Introducing polydispersity to suppress crystallization.
  • Compressing the system and analyzing structural relaxation times and dynamical heterogeneity.

Main Results:

  • Increased structural relaxation time correlates with emergent local hexagonal symmetry upon compression.
  • Three types of motion (0D, 1D, 2D) characterize dynamical heterogeneity.
  • Dynamically slow regions exhibit local hexagonal order.
  • Lengthscales of dynamic heterogeneity and local structure do not scale together approaching the glass transition.

Conclusions:

  • Local hexagonal order is associated with slower dynamics in colloidal systems.
  • The decoupling of dynamic heterogeneity and structural order lengthscales provides insight into glass transition mechanisms.
  • This study offers a detailed experimental perspective on structure-dynamics relationships in soft matter.