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Some unusual features in the behaviour of cyclohexane in confined geometry studied by neutron scattering

Farman, Hossein, Dore, John C., Webber, J. Beau W. (2002) Some unusual features in the behaviour of cyclohexane in confined geometry studied by neutron scattering. Journal of Molecular Liquids, 96-97 . pp. 353-362. ISSN 0167-7322. (doi:10.1016/S0167-7322(01)00359-2) (KAR id:13457)

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Abstract

Cyclohexane, C6H12, is one of the simplest organic molecules due to its sixfold symmetry and weak van der Waals interaction. The dynamic characteristics have been extensively studied in the liquid and plastic crystal phases by spectroscopic means and have been analysed in terms of an unhindered rotator model. The transition from the liquid to the plastic crystal at 6.55oC involves a low entropy change and leads to a fcc crystal with a large defect concentration. At lower temperatures, -87oC, the rotational motion is frozen out to give a brittle crystal phase.

Another unexpected phenomenon has been observed when cyclohexane liquid is added to the top of a granular powder of porous sol-gel silica in a sealed container. After a few minutes, an orange coloration develops in transmitted light (blue in reflected), which persists for up to a day. This behaviour indicates that there are spatial density variations on a scale comparable with that of light. Some test experiments using small-angle neutron scattering [5] showed that these features were changing on a time-scale of minutes; the effect could be observed in C6D12 but not in C6H12, confirming that the effect was due to the liquid behaviour in the pores. As a consequence of these recent studies, it is now interesting to make a more detailed study of the phase behaviour of cyclohexane in confined geometry and the following sections outline some of the research which is currently in progress.

Item Type: Article
DOI/Identification number: 10.1016/S0167-7322(01)00359-2
Additional information: EMLG Meeting on Physical Chemistry of Liquids - Molecules, Macromolecules, Biomolecule, REGENSBURG, GERMANY, SEP 08-13, 2000
Subjects: Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: J.B.W. Webber
Date Deposited: 11 Mar 2009 23:07 UTC
Last Modified: 06 Jun 2019 10:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/13457 (The current URI for this page, for reference purposes)
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