Neutron Diffraction Cryoporometry - A measurement technique for studying mesoporous materials and the phases of contained liquids and their crystalline forms

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. (Access to this publication is restricted)

PDF (Published Paper)
Restricted to Repository staff only
Contact us about this Publication Download (516kB)
[img]
PDF (Final Draft) - Accepted Version
Available under License Creative Commons Attribution No Derivatives.
Download (301kB)
[img]
Preview
Official URL
http://dx.doi.org/10.1016/j.nima.2007.12.004

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
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)
  • Depositors only (login required):

Downloads

Downloads per month over past year