Effect of temperature and pressure on the structural (alpha-) and the true Johari-Goldstein (beta-) relaxation in binary mixtures (Articolo in rivista)

Type
Label
  • Effect of temperature and pressure on the structural (alpha-) and the true Johari-Goldstein (beta-) relaxation in binary mixtures (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Kessairi, K; Capaccioli, S; Prevosto, D; Sharifi, S; Rolla, P (2007)
    Effect of temperature and pressure on the structural (alpha-) and the true Johari-Goldstein (beta-) relaxation in binary mixtures
    in Journal of non-crystalline solids
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Kessairi, K; Capaccioli, S; Prevosto, D; Sharifi, S; Rolla, P (literal)
Pagina inizio
  • 4273 (literal)
Pagina fine
  • 4277 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 353 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; CNR, INFM, POLYLAB, I-56127 Pisa, Italy; CNR, INFM, CRS, SOFT, I-00185 Rome, Italy (literal)
Titolo
  • Effect of temperature and pressure on the structural (alpha-) and the true Johari-Goldstein (beta-) relaxation in binary mixtures (literal)
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. (c) 2007 Elsevier B.V. All rights reserved. (literal)
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