title: A trapped water network in nanoporous material: the role of interfaces.
abstract: The infrared spectra of water confined in well controlled pore glasses were recorded as a function of the pore size ranging from 8 to 320 nm and in the 30-4000 cm(-1) spectral range using the ATR technique. The experiments prove that even in the large pores, the water network is significantly perturbed. The energy of the connectivity (or hindered translation) band (around 150 cm(-1)) is found to increase when the pore size decreases, indicating that confinement increases the H-bonding between neighbouring water molecules. Moreover, a drastic decrease of the FWHM of the connectivity band was observed upon confinement. This can be related to some ordering induced by the rigid walls of the pores. Furthermore, the partial filling of pores causes a significant modification to the water network, resembling heating of the trapped liquid and suggesting a role played by the water/air interface.
authors: Institut Rayonnement Matière de Saclay, Service Interdisciplinaire sur les Systèmes Moléculaires et les Matériaux, UMR 3299 CNRS/CEA SIS2M, Laboratoire de Radiolyse, Bâtiment 546, F-91191 Gif-sur-Yvette Cedex, France. sophie.le-caer@cea.fr
authors: S
authors: S
authors: Le Caër
authors: S
authors: S
authors: Pin
authors: S
authors: S
authors: Esnouf
authors: Q
authors: Q
authors: Raffy
authors: J Ph
authors: JP
authors: Renault
authors: J-B
authors: JB
authors: Brubach
authors: G
authors: G
authors: Creff
authors: P
authors: P
authors: Roy
mesh_terms: D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D013055:Spectrophotometry, Infrared; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water