Abstract
We characterized the water adsorbed to amorphous cellulose by means of quasielastic neutron scattering experiments. In a transition range 205 K⩽ T⩽273 K, a strong and continuous loss of elastic intensity signals the presence of relaxational processes. Quasielastic scattering is found both on the ns and ps time scale. The ns process is thought to arise from strongly bound water while the ps process is attributed to fast reorientational movements of H 2O molecules. Both motions disappear upon drying. This clearly demonstrates that they are related to the water system. No relaxations on these time scales are found in crystalline or amorphous ice. Different scenarii are invoked to explain the experimental observations.
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