NMR-Studies of the Diffusion of Cyclohexane in Porous Silica

Mitzithras, A. and Coveney, F.M. and Strange, John H. (1992) NMR-Studies of the Diffusion of Cyclohexane in Porous Silica. In: Journal of Molecular Liquids. 1991 Annual Meeting Of The British Radiofrequency Spectroscopy Group , 54. Elsevier Science Bv, Elsevier Science BV, Po Box 211, 1000 AE Amsterdam, Netherlands pp. 253-259. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1016/0167-7322(92)80034-F

Abstract

Self diffusion measurements of cyclohexane adsorbed in porous silica glass with a range of pore diameters are reported. The diffusion measurements were made by Nuclear Magnetic Resonance (nmr) using the spin-echo pulsed field-gradient method (pgse). No deviation from a Gaussian diffusion process and no evidence of bounded motion was found. However, a different behaviour to that reported in the literature for similar samples which were water saturated was observed for the relative reduction of the diffusion constant, D(eff)/D(o). The relation D(eff)/D(o)=e(-b/d) was found to describe the diffusion of the cyclohexane and this supports a semi-empirical model of molecular motion in confined geometry which can be characterised by two physical parameters, namely the pore diameter, d, and the ''effective'' permeability, 1/b.

Item Type: Conference or workshop item (Paper)
Additional information: Issue number is : 4 The event is an annual meeting.
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: M. Nasiriavanaki
Date Deposited: 26 Aug 2009 08:24
Last Modified: 17 Apr 2014 08:58
Resource URI: http://kar.kent.ac.uk/id/eprint/22373 (The current URI for this page, for reference purposes)
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