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Microscopic investigation of the Johari-Goldstein relaxation in cumene: Insights on the mosaic structure in a van der Waals liquid.

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Title: Microscopic investigation of the Johari-Goldstein relaxation in cumene: Insights on the mosaic structure in a van der Waals liquid.
Authors: Caporaletti, Federico1,2 (AUTHOR) federico.caporaletti@ulb.be, Capaccioli, Simone3,4 (AUTHOR), Bessas, Dimitrios5 (AUTHOR), Chumakov, Aleksander I.5 (AUTHOR), Martinelli, Alessandro6 (AUTHOR), Monaco, Giulio1,6 (AUTHOR) giulio.monaco@unipd.it
Source: Journal of Molecular Liquids. Aug2023, Vol. 383, pN.PAG-N.PAG. 1p.
Subjects: Cumene, Supercooled liquids, Molecular interactions, Investigation reports, Liquids, Inelastic scattering
Abstract: The Johari-Goldstein (β J G) relaxation anticipates in time, and is closely connected to, the structural relaxation in deeply supercooled liquids. Probing its microscopic properties is a crucial step for a complete understanding of the glass-transition. We here report the investigation of the van der Waals glass-former cumene using time-domain interferometry, a technique able to probe microscopic density fluctuations at the spatial and temporal scales relevant for the β J G -relaxation. We find that the molecules participating in it undergo a restricted motion, though sufficient to induce local, cage-breaking events at the characteristic time-scale for molecular re-orientations. A detailed characterization of the relaxation strength, i.e. the fraction of molecules involved in the relaxation process, shows that such molecules are connected in a percolating cluster which, above the glass-transition temperature, T g , is weakly dependent on temperature. Our results confirm thus previous observations of a mosaic structure associated to the β J G -relaxation in the supercooled state, and provide additional information on its temperature evolution above the glass-transition temperature. We conclude that the observed microscopic properties of the β J G -relaxation, and thus of the associated mosaic structure, are generic and independent of the molecular interaction potential. In addition, we show that, while the dynamics within the percolating cluster becomes progressively slower on approaching T g , the fraction of the molecules involved in cage-breaking events within the β J G -relaxation is not affected by temperature. • The Johari-Goldstein relaxation of cumene is studied by nuclear γ -resonance time-domain interferometry. • The microscopic properties of the Johari-Goldstein relaxation are shown to be independent of the interaction potential. • The "mosaic structure" associated to the Johari-Goldstein relaxation is weakly dependent on temperature. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Molecular Liquids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 164417731
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  Data: Microscopic investigation of the Johari-Goldstein relaxation in cumene: Insights on the mosaic structure in a van der Waals liquid.
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  Data: <searchLink fieldCode="AR" term="%22Caporaletti%2C+Federico%22">Caporaletti, Federico</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> federico.caporaletti@ulb.be</i><br /><searchLink fieldCode="AR" term="%22Capaccioli%2C+Simone%22">Capaccioli, Simone</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bessas%2C+Dimitrios%22">Bessas, Dimitrios</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chumakov%2C+Aleksander+I%2E%22">Chumakov, Aleksander I.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Martinelli%2C+Alessandro%22">Martinelli, Alessandro</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Monaco%2C+Giulio%22">Monaco, Giulio</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)<i> giulio.monaco@unipd.it</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Molecular+Liquids%22">Journal of Molecular Liquids</searchLink>. Aug2023, Vol. 383, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Cumene%22">Cumene</searchLink><br /><searchLink fieldCode="DE" term="%22Supercooled+liquids%22">Supercooled liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+interactions%22">Molecular interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Investigation+reports%22">Investigation reports</searchLink><br /><searchLink fieldCode="DE" term="%22Liquids%22">Liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Inelastic+scattering%22">Inelastic scattering</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Johari-Goldstein (β J G) relaxation anticipates in time, and is closely connected to, the structural relaxation in deeply supercooled liquids. Probing its microscopic properties is a crucial step for a complete understanding of the glass-transition. We here report the investigation of the van der Waals glass-former cumene using time-domain interferometry, a technique able to probe microscopic density fluctuations at the spatial and temporal scales relevant for the β J G -relaxation. We find that the molecules participating in it undergo a restricted motion, though sufficient to induce local, cage-breaking events at the characteristic time-scale for molecular re-orientations. A detailed characterization of the relaxation strength, i.e. the fraction of molecules involved in the relaxation process, shows that such molecules are connected in a percolating cluster which, above the glass-transition temperature, T g , is weakly dependent on temperature. Our results confirm thus previous observations of a mosaic structure associated to the β J G -relaxation in the supercooled state, and provide additional information on its temperature evolution above the glass-transition temperature. We conclude that the observed microscopic properties of the β J G -relaxation, and thus of the associated mosaic structure, are generic and independent of the molecular interaction potential. In addition, we show that, while the dynamics within the percolating cluster becomes progressively slower on approaching T g , the fraction of the molecules involved in cage-breaking events within the β J G -relaxation is not affected by temperature. • The Johari-Goldstein relaxation of cumene is studied by nuclear γ -resonance time-domain interferometry. • The microscopic properties of the Johari-Goldstein relaxation are shown to be independent of the interaction potential. • The "mosaic structure" associated to the Johari-Goldstein relaxation is weakly dependent on temperature. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Molecular Liquids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
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      – Type: doi
        Value: 10.1016/j.molliq.2023.122107
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Cumene
        Type: general
      – SubjectFull: Supercooled liquids
        Type: general
      – SubjectFull: Molecular interactions
        Type: general
      – SubjectFull: Investigation reports
        Type: general
      – SubjectFull: Liquids
        Type: general
      – SubjectFull: Inelastic scattering
        Type: general
    Titles:
      – TitleFull: Microscopic investigation of the Johari-Goldstein relaxation in cumene: Insights on the mosaic structure in a van der Waals liquid.
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          Name:
            NameFull: Caporaletti, Federico
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            NameFull: Capaccioli, Simone
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            NameFull: Bessas, Dimitrios
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            NameFull: Chumakov, Aleksander I.
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            NameFull: Martinelli, Alessandro
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            NameFull: Monaco, Giulio
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          Dates:
            – D: 01
              M: 08
              Text: Aug2023
              Type: published
              Y: 2023
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              Value: 01677322
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              Value: 383
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            – TitleFull: Journal of Molecular Liquids
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