Understanding Relaxation in the Kob-Andersen Liquid Based on Entropy, String, Shoving, Localization, and Parabolic...

Area of Science:

• Condensed Matter Physics
• Computational Materials Science
• Chemical Physics

Background:

• Understanding glass formation is crucial for materials science.
• Numerous theoretical models exist, often focusing on different aspects like entropy, particle motion, or free volume.
• The relationship between these models and simulation data requires thorough investigation.

Purpose of the Study:

• To evaluate the validity of diverse glass formation models.
• To compare model predictions against molecular dynamics simulation data.
• To explore potential unifying principles in glass formation theories.

Main Methods:

• Utilized molecular dynamics simulations of the Kob-Andersen (KA) model system.
• Simulated the KA model under various constant volume and constant pressure conditions.
• Assessed the performance of multiple established glass formation models against simulation results.

Main Results:

• Demonstrated that Adam-Gibbs, string, shoving, localization, and parabolic models all reasonably describe relaxation and diffusion data.
• Found consistent model performance across different simulation conditions (constant volume and pressure).
• Highlighted the applicability of these models to the KA system.

Conclusions:

• The study reveals a significant unity among leading models of glass formation.
• These models effectively capture structural relaxation and diffusion phenomena in the KA system.
• Findings support previous inferences about the interconnectedness of glass formation theories, particularly for polymeric liquids.