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Título : Hydration water dynamics in solutions of hydrophilic polymers, biopolymers and other glass forming materials by dielectric spectroscopy
Autor : Cerveny, Silvina ; Alegría, Ángel ; Colmenero de León, Juan
Palabras clave : Glass
Differential scanning calorimetry
Permittivity
Carrier relaxation time
Fecha de publicación : 21-feb-2008
Editor: American Institute of Physics
Citación : AIP Conf. Proc. 982: 706-711 (2008)
Resumen: Broadband dielectric spectroscopy (10^−2 Hz–10^6 Hz) and differential scanning calorimetry measurements have been performed to study the molecular dynamics of several water solutions in the water concentration region from 30 wt% to 50 wt% and in the temperature range from 140 to 250 K. The analysis of the dielectric data in these water solutions revealed an universality in the temperature dependence of the relaxation times at temperatures lower and higher than the calorimetric glass transition (Tg). At temperatures lower than Tg, an universal Arrhenius behaviour with an average activation energy of (0.54 ± 0.10) eV is obtained, whereas at temperatures higher than Tg an universal VFT (Vogel-Fulcher-Tamman) behaviour is found.
Descripción : 6 pages.-- PACS nrs.: 77.22.Gm, 61.41.+e, 64.70.P-.-- Communication presented at the 5th International Workshop on Complex Systems (September 25-28, 2007, Sendai, Japan).
Versión del editor: http://dx.doi.org/10.1063/1.2897882
URI : http://hdl.handle.net/10261/7544
DOI: 10.1063/1.2897882
ISSN: 0094-243X
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