Webber, J. Beau W. and Dore, John C. (2008) Neutron Diffraction Cryoporometry - A measurement technique for studying mesoporous materials and the phases of contained liquids and their crystalline forms. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 586 (2). pp. 356-366. ISSN 0168-9002. (Access to this publication is restricted)
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Neutron diffraction is a standard method for determining the structure of matter on an atomic scale; NMR cryoporometry is a recent widely applicable technique for characterising structure on a 2 nm to 2 mu m scale. An extension of these techniques is described, Neutron Diffraction Cryoporometry (NDC). The information from a set of neutron diffraction measurements of liquids and their crystalline forms in meso-pores, as a function of temperature, is displayed as a cryoporometry graph. The data may then be conveniently interpreted using the Gibbs-Thomson relationship by analogy with the existing technique, NMR cryoporometry. Clear information is thus obtained on the relationship between phase and nano-structure, in a form well suited to further analysis. This method is applied to an equilibrium study of water/ice in SBA-15 templated silicas, as model nano- to meso-structured systems. The method described here uses global pattern matching (a one-dimensional morphing algorithm inside a linear least-squares fitting algorithm) applied to the full range of the diffraction data. This is a rapid method by comparison with the conventional method of fitting individual (overlapping) peaks, and has already led to NMR observations indicating plastic (rotator phase) ice in the same system.
|Uncontrolled keywords:||confined geometry; phase-change; Gibbs-Thomson; neutron scattering; neutron diffraction; plastic ice; NMR; NMR relaxation; cryoporometry; DSC; thermoporosimetry; global fitting; pattern matching; morphing; porous silica|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group|
|Depositing User:||J.B.W. Webber|
|Date Deposited:||18 Apr 2009 09:21|
|Last Modified:||01 May 2014 08:59|
|Resource URI:||https://kar.kent.ac.uk/id/eprint/13471 (The current URI for this page, for reference purposes)|