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Effect of temperature and pressure on the structural (α-) and the true Johari–Goldstein (β-) relaxation in binary mixtures

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Title: Effect of temperature and pressure on the structural (α-) and the true Johari–Goldstein (β-) relaxation in binary mixtures
Authors: Kessairi, Khadra1,2 khadra@df.unipi.it, Capaccioli, Simone1,3, Prevosto, Daniele1,2, Sharifi, Soheil1, Rolla, Pierangelo1,2
Source: Journal of Non-Crystalline Solids. Dec2007, Vol. 353 Issue 47-51, p4273-4277. 5p.
Subjects: Glass transition temperature, Dielectrics, Polarization (Electricity), Dispersion (Chemistry)
Abstract: Abstract: We investigated the microscopic origin of the excess wing through isothermal and isobaric dielectric relaxation measurements for the Quinaldine/tristyrene mixture. Our results show that the excess wing, characteristic of the high frequency side of the structural loss peak in neat Quinaldine, becomes a well resolved Johari–Goldstein secondary relaxation on mixing with the apolar tristyrene. Analyzing the temperature and pressure behavior of the two processes, a clear correlation has been found between the structural relaxation time, the Johari–Goldstein relaxation time and the dispersion of the structural relaxation (i.e. its Kohlrausch parameter). These results support the idea that the Johari–Goldstein relaxation acts as a precursor of the structural relaxation and therefore of the glass transition phenomenon. [Copyright &y& Elsevier]
Copyright of Journal of Non-Crystalline Solids 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 27356666
AccessLevel: 6
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PubTypeId: academicJournal
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  Data: Effect of temperature and pressure on the structural (α-) and the true Johari–Goldstein (β-) relaxation in binary mixtures
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  Data: <searchLink fieldCode="AR" term="%22Kessairi%2C+Khadra%22">Kessairi, Khadra</searchLink><relatesTo>1,2</relatesTo><i> khadra@df.unipi.it</i><br /><searchLink fieldCode="AR" term="%22Capaccioli%2C+Simone%22">Capaccioli, Simone</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Prevosto%2C+Daniele%22">Prevosto, Daniele</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Sharifi%2C+Soheil%22">Sharifi, Soheil</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rolla%2C+Pierangelo%22">Rolla, Pierangelo</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. Dec2007, Vol. 353 Issue 47-51, p4273-4277. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectrics%22">Dielectrics</searchLink><br /><searchLink fieldCode="DE" term="%22Polarization+%28Electricity%29%22">Polarization (Electricity)</searchLink><br /><searchLink fieldCode="DE" term="%22Dispersion+%28Chemistry%29%22">Dispersion (Chemistry)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: We investigated the microscopic origin of the excess wing through isothermal and isobaric dielectric relaxation measurements for the Quinaldine/tristyrene mixture. Our results show that the excess wing, characteristic of the high frequency side of the structural loss peak in neat Quinaldine, becomes a well resolved Johari–Goldstein secondary relaxation on mixing with the apolar tristyrene. Analyzing the temperature and pressure behavior of the two processes, a clear correlation has been found between the structural relaxation time, the Johari–Goldstein relaxation time and the dispersion of the structural relaxation (i.e. its Kohlrausch parameter). These results support the idea that the Johari–Goldstein relaxation acts as a precursor of the structural relaxation and therefore of the glass transition phenomenon. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Non-Crystalline Solids 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:
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      – Type: doi
        Value: 10.1016/j.jnoncrysol.2007.01.095
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 5
        StartPage: 4273
    Subjects:
      – SubjectFull: Glass transition temperature
        Type: general
      – SubjectFull: Dielectrics
        Type: general
      – SubjectFull: Polarization (Electricity)
        Type: general
      – SubjectFull: Dispersion (Chemistry)
        Type: general
    Titles:
      – TitleFull: Effect of temperature and pressure on the structural (α-) and the true Johari–Goldstein (β-) relaxation in binary mixtures
        Type: main
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          Name:
            NameFull: Kessairi, Khadra
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            NameFull: Capaccioli, Simone
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            NameFull: Prevosto, Daniele
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            NameFull: Sharifi, Soheil
      – PersonEntity:
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            NameFull: Rolla, Pierangelo
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          Dates:
            – D: 01
              M: 12
              Text: Dec2007
              Type: published
              Y: 2007
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              Value: 353
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              Value: 47-51
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            – TitleFull: Journal of Non-Crystalline Solids
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