Abstract

The microscopic dynamics of hydration water exhibits some universal features that do notdepend on the nature of the hydrated surface. We show that the hydration leveldependence of the dynamic transition in the mean squared atomic displacements measuredby means of elastic neutron scattering is qualitatively similar for hydration water ininorganic and organic hosts. The difference is that the former are ‘rigid’, whereas thedynamics of the latter can be enhanced by the motions of the hydration water. The overallhydration level appears to be the main parameter governing the magnitude of the meansquared atomic displacements in the hydration water, irrespective of the details of thehydrated host.

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