Relaxation supercooled glucose

Molinero, V., Cagin, T., and Goddard III, W.A. The mechanisms of nonexponential relaxation in supercooled glucose solutions The role of water facilitation, /. Phys. Ghent., 108, 3699, 2004. 

Nonexponential parameter p of the translational relaxation of water (upper panel) and glucose (lower panel) in the viscous supercooled liquid at temperatures from 1.5Tg (365 K), through 1.4Tg (335 K), to 1.3Tg (310 K). Note that for each temperature, water relaxation is more nonexponential (lower p) than for glucose. The p parameters were obtained from the stretched exponential fit of the intermediate scattering function Fs(k,t) for each component. 

We did not find any evidence of free volume channels in the mixtures of water and glucose, consistent with previous results of a study for water-sucrose in a broader range of water content (Molinero et al., 2003). The existence of such charmels, and the role of free volume in the dynamics of mixtures of oligosaccahrides with a high degree of polymerization deserve further study. The results presented here for water relaxation in supercooled DP12 allows us to generalize the observed mechanism for water diffusion in... 

The dielectric behaviour of viscous molecular liquids has been studied since the early 1930 s. Baker and Smyth (48) had observed relaxation in supercooled isoamyl- and isobutyl bromide in the kHz region and had noted the similarity to the relaxations of liquid glucose (49) and glycerol (50). Similar... 

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