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Strain Pattern in Supercooled Liquids.

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Summary
This summary is machine-generated.

Shear strain fluctuations in supercooled liquids exhibit elastic Eshelby-strain patterns, even at long times. This phenomenon persists beyond structural relaxation, offering new insights into glass transition physics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Investigations into the glass transition reveal complex phenomena in strain correlations.
  • Shear strain fluctuations in liquids can exhibit elastic Eshelby-strain patterns, typically associated with solid-like elastic responses.

Purpose of the Study:

  • To investigate the origin and characteristics of Eshelby-strain patterns in supercooled liquids near the glass transition.
  • To understand the long-ranged and long-lived nature of these strain signatures.

Main Methods:

  • Utilized mode-coupling theory for analyzing strain fluctuations in supercooled liquids.
  • Analyzed experimental data from video microscopy of a two-dimensional colloidal glass former.
  • Performed simulations of Brownian hard disks to complement theoretical and experimental findings.

Main Results:

  • Observed Eshelby-strain patterns [∼cos(4θ)/r^{2}] in shear strain fluctuations, characteristic of elastic response, even in liquids at long times.
  • Demonstrated that these strain signatures follow a scaling law near the glass transition.
  • Found the Eshelby-strain pattern to be visible on timescales longer than structural relaxation time (τ) and after shear modulus relaxation for sufficiently high viscosities.

Conclusions:

  • The presence of Eshelby-strain patterns in supercooled liquids challenges conventional understanding of liquid dynamics at the glass transition.
  • These findings highlight the importance of elastic-like correlations in the dynamics of glassy systems.
  • The observed scaling law provides a quantitative description of these long-range strain correlations near the glass transition.