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Related Experiment Videos

Slowing down supercooled liquids by manipulating their local structure.

Susana Marín-Aguilar1, Henricus H Wensink, Giuseppe Foffi

  • 1Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France. giuseppe.foffi@u-psud.fr frank.smallenburg@u-psud.fr.

Soft Matter
|December 5, 2019
PubMed
Summary

Controlling glassy systems is difficult. This study introduces a colloidal model that reinforces icosahedral structures, significantly slowing down dynamics and offering control over dense glassy systems.

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Determining fluid-crystal phase boundaries for a binary hard-sphere mixture using direct-coexistence simulations.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Glasses are poorly understood states of matter.
  • Controlling macroscopic dynamics of glassy systems via microscopic properties remains a challenge.

Purpose of the Study:

  • To propose a simple directional colloidal model for binary hard-sphere glasses.
  • To investigate the effect of promoting specific local structures on glassy dynamics.

Main Methods:

  • Development of a directional colloidal model.
  • Simulation of binary hard-sphere glasses with reinforced icosahedral local structures.

Main Results:

  • The proposed model successfully reinforces optimal icosahedral local structures.
  • A dramatic slowing down of dynamics was observed in systems with promoted icosahedral symmetry.

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Conclusions:

  • Promoting specific local structural environments, like the icosahedral structure, can control the dynamics of dense glassy systems.
  • This approach offers a new pathway for manipulating the behavior of complex materials.