Diffusional and vibrational properties of water confined in very thin nanoporous glasses probed by light and neutron scattering

Rayleigh-wing, Raman and quasi-elastic neutron scattering data on water con fined into nanoporous glasses (silica 26 Angstrom pores), are presented and discussed. The H-bond among water molecules and Si-Oil surface groups orig inates strong hydration effects, that induce more stable structural environ ments in which the memory of collective modes (the similar to 60 cm(-1) and similar to 190 cm(-1) shoulders due to the HE bending and HE stretching mo des of water) is lost and the O-H stretching band connected to low-density water tends to disappear. The quasi-elastic neutron response is explained i n terms of two available current models: the Dianoux-Volino model and the M CT model.