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Updated: Jun 3, 2025
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
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Structural Origin of Dynamic Heterogeneity in Supercooled Liquids
1Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
The Journal of Physical Chemistry. B
|January 10, 2025
Summary
Dynamic heterogeneity in supercooled liquids arises from structural order. Angular ordering in fragile liquids and local ordering in strong liquids influence particle dynamics and cooperativity, explaining complex liquid behaviors.
Area of Science:
- Condensed matter physics
- Materials science
- Physical chemistry
Background:
- Supercooled liquids exhibit dynamic heterogeneity, a phenomenon of spatially heterogeneous particle dynamics.
- The origins of dynamic heterogeneity in glass science remain a subject of extensive research and debate.
- Understanding this phenomenon is crucial for predicting liquid behavior near the glass transition point.
Purpose of the Study:
- To investigate the relationship between dynamic heterogeneity and structural order in supercooled liquids.
- To elucidate the physical origins of dynamic heterogeneity by examining fragile and strong liquids.
- To explore the role of angular and static ordering in influencing liquid dynamics.
Main Methods:
- Numerical simulations of fragile liquids with isotropic potentials.
- Numerical simulations of strong liquids with directional interactions.
- Analysis of angular ordering, static order, and particle rearrangement dynamics.
Main Results:
- Angular ordering, driven by steric interactions, significantly impacts fragile liquid dynamics and cooperativity.
- Growth of static order correlates with slower dynamics, particularly in fragile liquids exhibiting super-Arrhenius behavior.
- Strong liquids show a distinct "two-state" dynamic characteristic linked to spatially constrained local ordering.
Conclusions:
- Dynamic heterogeneity in supercooled liquids is fundamentally linked to underlying structural order, regardless of liquid fragility.
- The spatial extent of structural order dictates the observed dynamic heterogeneity.
- This study deepens the understanding of the interplay between structural and dynamic properties in metastable supercooled liquids.
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