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Structural and dynamic studies of water in mesoporous silicas using neutron scattering and nuclear magnetic resonance

Beau Webber and John Dore

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Experimental techniques for studying the behaviour of water in confined geometry using neutron scattering and NMR methods are reviewed. A brief survey is given of earlier work on sol–gel silicas and these findings are updated by reference to current work on MCM- and SBA-type silicas. Particular attention is focused on the phase transitions and the relation between supercooled water and ice phases in the confined geometry of the mesopores. The characteristics are found to behave in a systematic manner although the nucleation phenomenon for partially filled pores reveals some unexpected complexity for the SBA silicas.


PACS

61.05.Qr Magnetic resonance techniques; Mössbauer spectroscopy

76.60.Es Relaxation effects

61.05.fg Neutron scattering (including small-angle scattering)

61.05.fm Neutron diffraction

64.60.Q- Nucleation

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 45 (17 November 2004)

Received 5 April 2004, in final form 15 September 2004

Published 29 October 2004



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