info:eu-repo/semantics/article
Electrical Conductivity of Supercooled Aqueous Mixtures of Trehalose with Sodium Chloride
Fecha
2000-11Registro en:
Miller, Danforth P.; Conrad, Paul B.; Fucito, Silvana; Corti, Horacio Roberto; de Pablo, Juan J.; Electrical Conductivity of Supercooled Aqueous Mixtures of Trehalose with Sodium Chloride; American Chemical Society; Journal of Physical Chemistry B; 104; 44; 11-2000; 10419-10425
1520-6106
CONICET Digital
CONICET
Autor
Miller, Danforth P.
Conrad, Paul B.
Fucito, Silvana
Corti, Horacio Roberto
de Pablo, Juan J.
Resumen
The viscosity and electrical conductivity of aqueous solutions of trehalose and other saccharides containing 1:1 electrolytes have been measured. The decrease in the molar conductivity of each of these electrolytes with increasing viscosity is less than that predicted by Walden's rule. Instead, the empirical relation Ληα = constant, which has already been found for other glass-forming liquids, holds for these mixtures. The microscopic origin of the deviation from the viscous friction model could be related to the presence of local heterogeneities in the distribution of water about the ions. This hypothesis is supported by the results of extensive molecular simulations. The temperature dependence of the Walden product of NaCl in aqueous trehalose mixtures indicates that this salt is fully dissociated close to the glass-transition temperature (Tg).