Webber, J.B.W. and Dore, J.C. (2008) Neutron Diffraction Cryoporometry - A measurement technique for studying mesoporous materials and the phases of contained liquids and their crystalline forms. Nuclear Instruments & Methods In Physics Research Section A-Accelerators Spectrometers Detectors And Associated Equipment, 586 (2). pp. 356-366. ISSN 0168-9002.
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| Official URL http://dx.doi.org/10.1016/j.nima.2007.12.004 |
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Abstract
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.
| Item Type: | Article |
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| 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: | 22 Dec 2011 21:14 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/13471 (The current URI for this page, for reference purposes) |
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