The evaluation of the long term stability of a material requires the estimation of its long-time dynamics. For amorphous materials such as structural glasses, it has proven difficult to predict the long-time dynamics starting from static measurements. Here we consider how long one needs to monitor the dynamics of a structural glass to predict its long-time features. We present a detailed characterization of the statistical features of the single-particle intermittent motion, and show that single-particle jumps are the irreversible events leading to the relaxation of the system. This allows us to evaluate the diffusion constant on the time-scale of the jump duration, which is small and temperature independent, i.e. well before the system enters the diffusive regime. The prediction is obtained by analyzing the particle trajectories via a parameter-free algorithm.

From cage-jump motion to macroscopic diffusion in supercooled liquids / Pastore, Raffaele; Coniglio, Antonio; Pica Ciamarra, Massimo. - In: SOFT MATTER. - ISSN 1744-683X. - 10:31(2014), pp. 5724-5728. [10.1039/c4sm00739e]

From cage-jump motion to macroscopic diffusion in supercooled liquids

Pastore, Raffaele
;
Coniglio, Antonio;
2014

Abstract

The evaluation of the long term stability of a material requires the estimation of its long-time dynamics. For amorphous materials such as structural glasses, it has proven difficult to predict the long-time dynamics starting from static measurements. Here we consider how long one needs to monitor the dynamics of a structural glass to predict its long-time features. We present a detailed characterization of the statistical features of the single-particle intermittent motion, and show that single-particle jumps are the irreversible events leading to the relaxation of the system. This allows us to evaluate the diffusion constant on the time-scale of the jump duration, which is small and temperature independent, i.e. well before the system enters the diffusive regime. The prediction is obtained by analyzing the particle trajectories via a parameter-free algorithm.
2014
From cage-jump motion to macroscopic diffusion in supercooled liquids / Pastore, Raffaele; Coniglio, Antonio; Pica Ciamarra, Massimo. - In: SOFT MATTER. - ISSN 1744-683X. - 10:31(2014), pp. 5724-5728. [10.1039/c4sm00739e]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/718720
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