We report depolarized light scattering measurements of water–glucose solutions in a wide spectral range from 0.01 to 1000 cm-1, performed by the combined use of a double monocromator and a multipass Fabry–Perot interferometer. For the first time evidence is given of a low frequency relaxation process related to the glucose dynamics well separated from that of water. This low frequency process has a different origin with respect to the broad relaxation feature detected by dielectric spectroscopy and is interpreted in terms of Stokes–Einstein–Debye rotational diffusion of single glucose molecules.
Separate dynamics of solute and solvent in water-glucose solutions by depolarized light scattering
FIORETTO, Daniele;GALLINA, MARIA ELENA;MORRESI, Assunta;PALMIERI, Luciano;PAOLANTONI, Marco;SASSI, Paola;
2007
Abstract
We report depolarized light scattering measurements of water–glucose solutions in a wide spectral range from 0.01 to 1000 cm-1, performed by the combined use of a double monocromator and a multipass Fabry–Perot interferometer. For the first time evidence is given of a low frequency relaxation process related to the glucose dynamics well separated from that of water. This low frequency process has a different origin with respect to the broad relaxation feature detected by dielectric spectroscopy and is interpreted in terms of Stokes–Einstein–Debye rotational diffusion of single glucose molecules.File in questo prodotto:
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