Raman scattering and Fourier-transform infrared (FT-IR) absorption results on confined water are presented. The aim is to characterize different porous materials, studying the vibrational properties of water inserted in their porous structure, and determining the relationship between these two aspects. Confinement has been realized by using a sol–gel silica glass, GelSil, with 26 2 diameter pores of huge hydrophilic inner surface, and NaA type zeolites, with 10 2 diameter pores in which 27 H2O molecules can be located. The O–H stretching spectral range (2800–3800 cm1), as a function of temperature and for different water contents, has been explored. From a comparison of the data in these two cases, we put into evidence the structure breaker role of GelSil, as revealed by the slowing down of the collective contribution to the polarized O–H stretching band, indicating that the tetrabonded H2O network is destroyed. On the other side, NaA zeolites will be proofed to play a structure breaker effect on physisorbed water, since the contribution to the O–H stretching band linked to the tetrahedral ice-like arrangement is present ev

Dynamical properties of liquids in restricted geometries

CRUPI, Vincenza
;
MAJOLINO, Domenico;MIGLIARDO, Placido;VENUTI, Valentina
2005

Abstract

Raman scattering and Fourier-transform infrared (FT-IR) absorption results on confined water are presented. The aim is to characterize different porous materials, studying the vibrational properties of water inserted in their porous structure, and determining the relationship between these two aspects. Confinement has been realized by using a sol–gel silica glass, GelSil, with 26 2 diameter pores of huge hydrophilic inner surface, and NaA type zeolites, with 10 2 diameter pores in which 27 H2O molecules can be located. The O–H stretching spectral range (2800–3800 cm1), as a function of temperature and for different water contents, has been explored. From a comparison of the data in these two cases, we put into evidence the structure breaker role of GelSil, as revealed by the slowing down of the collective contribution to the polarized O–H stretching band, indicating that the tetrabonded H2O network is destroyed. On the other side, NaA zeolites will be proofed to play a structure breaker effect on physisorbed water, since the contribution to the O–H stretching band linked to the tetrahedral ice-like arrangement is present ev
File in questo prodotto:
File Dimensione Formato  
1432186.pdf

solo utenti autorizzati

Tipologia: Versione Editoriale (PDF)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 442.81 kB
Formato Adobe PDF
442.81 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11570/1432186
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 22
  • ???jsp.display-item.citation.isi??? 20
social impact