Effective one-component model of binary mixture : molecular arrest induced by the spatially correlated stochastic dynamics

doi:10.1038/s41598-019-54321-9

Effective one-component model of binary mixture : molecular arrest induced by the spatially correlated stochastic dynamics

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Effective one-component model of binary mixture : molecular arrest induced by the spatially correlated stochastic dynamics

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punktacja MEiN [2019]: 140

title:	Effective one-component model of binary mixture : molecular arrest induced by the spatially correlated stochastic dynamics
author:	Majka Maciej , Góra Paweł
journal title:	Scientific Reports
volume:	9
date of publication :	2019
article ID:	19661
eISSN:	2045-2322
DOI:	10.1038/s41598-019-54321-9
language:	English
journal language:	English
abstract in English:	Spatially correlated noise (SCN), i.e. the thermal noise that affects neighbouring particles in a similar manner, is ubiquitous in soft matter systems. In this work, we apply the over-damped SCN-driven Langevin equations as an effective, one-component model of the dynamics in dense binary mixtures. We derive the thermodynamically consistent fluctuation-dissipation relation for SCN to show that it predicts the molecular arrest resembling the glass transition, i.e. the critical slow-down of dynamics in the disordered phases. We show that the mechanism of singular dissipation is embedded in the dissipation matrix, accompanying SCN. We are also able to identify the characteristic length of collective dissipation, which diverges at critical packing. This novel physical quantity conveniently describes the difference between the ergodic and non-ergodic dynamics. The model is fully analytically solvable, one-dimensional and admits arbitrary interactions between the particles. It qualitatively reproduces several different modes of arrested disorder encountered in binary mixtures, including e.g. the re-entrant arrest. The model can be effectively compared to the mode coupling theory.
keywords in Polish:	przejście szkliste, szum skorelowany przestrzennie, mieszaniny dwuskładnikowe, układy nieuporządkowane, relacje fluktuacyjno-dyssypacyjne
keywords in English:	glass transition, disordered systems, binary mixtures, spatially correlated noise, molecular arrest, fluctuation-dissipation relations
departmental parameterization:	140
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper