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Published on: October 24, 2017
Super-Arrhenius temperature dependent viscosity due to liquid-liquid phase separation in the super-cooled
1Department of Chemistry and Ames Laboratory, Iowa State University, Ames,IA50010, Ames, 50011-2042, United States.
Abstract:
In this study, a recently introduced order parameter called the weighted coordination number (WCN) is used to study the liquid-liquid (LL) phase separation, indicating temperature-dependent coarsening of the LL interface as a possible mechanism for the glass transition. The well-established glass-forming Kob-Andersen binary Lennard-Jones system was used for this study. The gas-liquid binodal line was reconstructed using the WCNs, and the same approach is extended to study the liquid-liquid binodal line. Systems of various densities are instantaneously quenched from high to low temperatures where a liquid-liquid separation is observed. Densities and the composition of each liquid state are used to check the level rule, along with density and pressure profiles, demonstrating local equilibrium of liquid-liquid phase separation.The transition from the liquid-liquid phase separation in the supercooled region to the glass transition region is modeled by adopting a Markov Network Model to estimate the temperature dependent viscosity using liquid-liquid interfacial information from the classification.
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