A trapped water network in nanoporous material: the role of interfaces

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 pertur...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2011-01, Vol.13 (39), p.17658-17666
Main Authors: Le Caër, S, Pin, S, Esnouf, S, Raffy, Q, Renault, J Ph, Brubach, J-B, Creff, G, Roy, P
Format: Article
Language:English
Subjects:
Confinement
Liquids
Nanostructure
Nanostructures - chemistry
Networks
Particle Size
Pore size
Porosity
Spectra
Spectrophotometry, Infrared
Surface Properties
Translations
Water - chemistry
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Summary: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.
ISSN:1463-9076
1463-9084
DOI:10.1039/c1cp21980d