Is the Johari-Goldstein beta-relaxation universal? (Articolo in rivista)

Type
Label
  • Is the Johari-Goldstein beta-relaxation universal? (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Thayyil, MS; Capaccioli, S; Prevosto, D; Ngai, KL (2008)
    Is the Johari-Goldstein beta-relaxation universal?
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Thayyil, MS; Capaccioli, S; Prevosto, D; Ngai, KL (literal)
Pagina inizio
  • 4007 (literal)
Pagina fine
  • 4013 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 88 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Thayyil, M. Shahin; Capaccioli, S.; Prevosto, D.] Univ Pisa, CNR, INFM, PolyLab, Pisa, Italy; [Thayyil, M. Shahin; Capaccioli, S.; Prevosto, D.] Univ Pisa, Dept Phys, I-56100 Pisa, Italy; [Thayyil, M. Shahin] Univ Calicut, Dept Phys, Malappuram, Kerala, India; [Ngai, K. L.] USN, Res Lab, Washington, DC 20375 USA (literal)
Titolo
  • Is the Johari-Goldstein beta-relaxation universal? (literal)
Abstract
  • The Johari-Goldstein (JG) beta-relaxation is supposedly a universal feature of glassy dynamics and has strong connections to structural alpha-relaxation in all glass-formers. On the other hand, some small molecular glass-formers give no indication that JG relaxation is present, despite numerous investigations using a variety of experimental techniques. These exceptions cast doubt on universality and fundamental importance. Theoretical considerations suggest that the JG beta-relaxation is present but unresolved in these glass-formers because it is sandwiched between the more intense alpha-relaxation and a faster, but non-JG, secondary gamma-relaxation. We report representative data on two glass-formers, benzophenone and dimethyl phthalate. We show that by dissolving either glass-former in a host with a much higher glass transition temperature, we were able to move the alpha-relaxation further from the gamma-relaxation. We also report, for the first time, JG beta-relaxation in two glass-formers of current research interest. (literal)
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