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Summary

This summary is machine-generated.

Highly viscous flow in undercooled liquids arises from structural transitions. This explains why relaxation times are longer than predicted by the Maxwell time, revealing key insights into liquid dynamics.

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Area of Science:

Condensed matter physics
Materials science
Rheology

Background:

Understanding the behavior of undercooled liquids is crucial for materials science and predicting their flow properties.
Viscous flow in these systems is complex and not fully explained by classical models.

Purpose of the Study:

To investigate the mechanism behind highly viscous flow in undercooled liquids.
To explain the discrepancy between structural relaxation time and Maxwell time.

Main Methods:

The study proposes a model based on thermally activated Eshelby transitions.
It involves a self-consistent determination of viscosity within this framework.

Main Results:

Eshelby transitions create structural changes with differing elastic misfit, driving viscous flow.
The model explains the observed structural relaxation time being eight times longer than the Maxwell time.
Strongly strained inherent states significantly contribute to fluidity (inverse viscosity).

Conclusions:

Thermally activated Eshelby transitions are the primary cause of high viscosity in undercooled liquids.
The coexistence of viscous no-return and retardation processes at the Maxwell time is highlighted.