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Effect of temperature and pressure on the structural (alpha-) and the true Johari-Goldstein (beta-) relaxation in binary mixtures (Articolo in rivista)
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- 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)
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- Kessairi, K; Capaccioli, S; Prevosto, D; Sharifi, S; Rolla, P (literal)
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- ISI Web of Science (WOS) (literal)
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- 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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