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Inner clocks of glass-forming fluids

Peredo-Ortiz, Ricardo and Medina-Noyola, Magdaleno and Voigtmann, Thomas and Elizondo Aguilera, Luis Fernando (2022) Inner clocks of glass-forming fluids. Journal of Chemical Physics, 156, p. 244506. American Institute of Physics (AIP). doi: 10.1063/5.0087649. ISSN 0021-9606.

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Abstract

Providing a physically sound explanation of aging phenomena in non-equilibrium amorphous materials is a challenging problem in modern statistical thermodynamics. The slow evolution of physical properties after quenches of control parameters is empirically well interpreted via the concept of material time (or internal clock) based on the Tool–Narayanaswamy–Moynihan model. Yet, the fundamental reasons of its striking success remain unclear. We propose a microscopic rationale behind the material time on the basis of the linear laws of irreversible thermodynamics and its extension that treats the corresponding kinetic coefficients as state functions of a slowly evolving material state. Our interpretation is based on the recognition that the same mathematical structure governs both the Tool model and the recently developed non-equilibrium extension of the self-consistent generalized Langevin equation theory, guided by the universal principles of Onsager’s theory of irreversible processes. This identification opens the way for a generalization of the material-time concept to aging systems where several relaxation modes with very different equilibration processes must be considered, and partially frozen glasses manifest the appearance of partial ergodicity breaking and, hence, materials with multiple very distinct inner clocks.

Item URL in elib:https://elib.dlr.de/187697/
Document Type:Article
Title:Inner clocks of glass-forming fluids
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Peredo-Ortiz, RicardoUNSPECIFIEDUNSPECIFIED
Medina-Noyola, MagdalenoUniversidad Autónoma de San Luis PotosíUNSPECIFIED
Voigtmann, ThomasUNSPECIFIEDUNSPECIFIED
Elizondo Aguilera, Luis FernandoInstitute of Materials Physics in SpaceUNSPECIFIED
Date:29 June 2022
Journal or Publication Title:Journal of Chemical Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:156
DOI:10.1063/5.0087649
Page Range:p. 244506
Publisher:American Institute of Physics (AIP)
ISSN:0021-9606
Status:Published
Keywords:glass transition; aging
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:24 Aug 2022 14:53
Last Modified:30 Aug 2022 09:07

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