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Universal features of water dynamics in solutions of hydrophilic polymers, biopolymers, and small glass-forming materials

AuthorsCerveny, Silvina ; Alegría, Ángel ; Colmenero de León, Juan
KeywordsBiomedical materials
Dielectric relaxation
Polymer solutions
Biopolymer chemistry, biopolymerization
Structure of molecular liquids
Dielectric loss and relaxation
Issue Date17-Mar-2008
PublisherAmerican Physical Society
CitationPhysical Review E 77, 031803 (2008).
AbstractA systematic investigation by dielectric spectroscopy of 18 different water-rich mixtures with very different hydrophilic substances shows universal features for the water dynamics. The temperature dependence of the relaxation times exhibits a crossover from non-Arrhenius to Arrhenius behavior at the Tg range of the mixtures. Furthermore, the temperature dependence of the relaxation times presents a universal behavior both above and below the crossover temperature. We also show that these features suggest that the observed crossover is associated with the emergence of confinement effects.
Description5 pp.-- PACS nrs.: 82.35.Pq, 61.25.Em, 77.22.Gm.-- PMID: 18517410.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevE.77.031803
Appears in Collections:(CFM) Artículos
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