Microscopic origin of excess wings in relaxation spectra of supercooled liquids

Guiselin, Benjamin; Scalliet, Camille; Berthier, Ludovic

doi:10.1038/s41567-022-01508-z

Cited by 51 publications

(34 citation statements)

References 46 publications

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“…For supercooled liquids, recent simulations attribute the wing to rare and localized rearrangement events, while the peak relates to the growth by "dynamical facilitation" of regions in the material that have already rearranged. 35,36 Within the framework of foam mechanics, the wing can be considered corresponding to delayed elastic storage, consistent with the idea that the few intermittent events occurring within a short lag time will lead to an increase of strain in a matrix that has not yet been restructured-a contribution that can be fully recovered. Whether the final relaxation of foam can be attributed to a growth of already rearranged zones or to a percolation of the rearranged zones has yet to be established.…”

Section: Discussionmentioning

confidence: 63%

Delayed elastic contributions to the viscoelastic response of foams

Lavergne

Sollich

Trappe

2022

The Journal of Chemical Physics

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We show that the slow viscoelastic response of a foam is that of a power-law fluid with a terminal relaxation. Investigations of the foam mechanics in creep and recovery tests reveal that the power-law contribution is fully reversible, indicative of a delayed elastic response. We demonstrate how this contribution fully accounts for the non-Maxwellian features observed in all tests, probing the linear mechanical response function. The associated power-law spectrum is consistent with soft glassy rheology of systems with mechanical noise temperatures just above the glass transition [Fielding et al., J. Rheol. 44, 323 (2000)] and originates from a combination of superdiffusive bubble dynamics and stress diffusion, as recently evidenced in simulations of coarsening foam [Hwang et al., Nat. Mater. 15, 1031 (2016)].

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Section: Discussionmentioning

confidence: 63%

Delayed elastic contributions to the viscoelastic response of foams

Lavergne

Sollich

Trappe

2022

The Journal of Chemical Physics

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“…[130]). Understanding the properties of the most probable paths between minima of the energy landscape is of particular interest to understand the dynamics of relaxation in glasses, and could help bridge the gap between microscopic dynamics and mesoscopic models that recently shed new light on the interpretation of the relaxation spectrum of glassy materials [72,73].…”

Section: The Road Ahead: From Packings To Generic Dynamical Systemsmentioning

confidence: 99%

When you can’t count, sample!

Martiniani¹,

Casiulis²

2023

Pap. Phys.

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In statistical mechanics, measuring the number of available states and their probabilities, and thus the system’s entropy, enables the prediction of the macroscopic properties of a physical system at equilibrium. This predictive capacity hinges on the knowledge of the a priori probabilities of observing the states of the system, given by the Boltzmann distribution. Unfortunately, the successes of equilibrium statistical mechanics are hardto replicate out of equilibrium, where the a priori probabilities of observing states are, in general, not known, precluding the naı̈ve application of common tools. In the last decade, exciting developments have occurred that enable direct numerical estimation of the entropy and density of states of athermal and non-equilibrium systems, thanks to significant methodological advances in the computation of the volume of high-dimensional basins of attraction. Here, we provide a detailed account of these methods, underscoring the challenges present in such estimations, recent progress on the matter, and promising directions for future work.

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“…[116]). Understanding the properties of the most probable paths between minima of the energy landscape is of particular interest to understand the dynamics of relaxation in glasses, and could help bridge the gap between microscopic dynamics and mesoscopic models that recently shed new light on the interpretation of the relaxation spectrum of glassy materials [74,75].…”

Section: The Road Ahead: From Packings To Generic Dynamical Systemsmentioning

confidence: 99%