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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 104, 2006 - Issue 4
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Original Articles

Diffusive dynamics of water in ion-exchanged zeolites

C. Corsaro Physics Department, University of Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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V. Crupi Physics Department, University of Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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D. Majolino Physics Department, University of Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, ItalyCorrespondence[email protected]
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P. Migliardo Physics Department, University of Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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V. Venuti Physics Department, University of Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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U. Wanderlingh Physics Department, University of Messina, C. da Papardo, S. ta Sperone 31, P.O. Box 55, 98166 S. Agata, Messina, Italy
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T. Mizota Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Ube 755-8611, Japan
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M. Telling ISIS, Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, UK
 show all
Pages 587-598 | Received 19 Oct 2005, Published online: 20 Aug 2006
 
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Abstract

In this paper, an incoherent quasi-elastic neutron scattering (IQENS) study of the single-particle dynamics of water in fully hydrated Na-A and Mg50-A zeolites at T = 293 K and T = 333 K is presented. In order to probe different time scales, measurements were made at two resolutions, ∼8 µeV and ∼28 µeV. The high-resolution data allowed us to investigate the slower dynamics, which is mainly translational. The low-resolution spectra were used to probe the faster dynamics and distinguish between diffusional and rotational motion. We found that the partial exchange of Na+ with Mg2+ induces: (a) an increase of the available volume for diffusion; (b) a decrease of the fraction of water molecules taking part in the observed jump diffusion process; and (c) a shortening of the residence time.

Acknowledgement

The ISIS Scientific Coordination Office (SCO) is acknowledged for the dedicated beam time.

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