Issue 26, 2010

Pore size dependent dynamics of confined water probed by FIR spectroscopy

Abstract

We measured the FIR (Far Infrared) absorbance of a series of organic hydrated sub-nanopores (i.e. pores of the size of several Å) containing confined water. Our results show that the FIR frequency region between 400 and 570 cm−1 is sensitive to the differences in water mobility. The absorbance of these compounds was significantly higher than that of chemically similar anhydrous or non-porous hydrated compounds in the same region. Moreover, changes in the water dynamics inside the hydrated pores were found and characterized by their temperature dependent studies in the range from −5 to 20 °C. Upon increasing the temperature, water confined in narrow pores shows a small increase in FIR absorbance, while less confined water molecules inside larger pores exhibit a higher increase in absorbance, resembling more what has been observed for bulk water.

Graphical abstract: Pore size dependent dynamics of confined water probed by FIR spectroscopy

Supplementary files

Article information

Article type
Communication
Submitted
15 Jan 2010
Accepted
08 Apr 2010
First published
11 May 2010

Phys. Chem. Chem. Phys., 2010,12, 6928-6932

Pore size dependent dynamics of confined water probed by FIR spectroscopy

N. Pérez-Hernández, T. Q. Luong, C. Pérez, J. D. Martín and M. Havenith, Phys. Chem. Chem. Phys., 2010, 12, 6928 DOI: 10.1039/C000985G

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