Raman spectroscopic study of organo-montmorillonites

He, Hongping and Frost, Ray L. and Xi, Yunfei and Zhu, Jianxi (2004) Raman spectroscopic study of organo-montmorillonites. Journal of Raman Spectroscopy, 35(4). pp. 316-323.

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DOI : 10.1002/jrs.1165

Abstract

A Raman spectroscopic study on the organo-montmorillonites prepared at different concentrations has provided a detailed observation about the ordering conformation of HDTMA+ ions confined within the montmorillonite interlayer. The ordering conformation shows strong dependence on the concentration of the confined amine. Both wavenumber and band width of antisymmetric and symmetric stretching modes are sensitive to the ordering conformation of the inserted organic cation. Furthermore, the wavenumber of the antisymmetric stretching mode is more sensitive to the mobility of the tail of amine chain than that of symmetric stretching mode does. At room temperature, the conformational ordering is more easily to be effected by the packing density in the lateral model than in the paraffin-type model. However, at liquid nitrogen temperature, both the positions of antisymmetric and symmetric stretching modes are independent of the amine concentration, and the band width of symmetric stretching mode is sensitive to the ordering conformation of organic. Upon heating the organo-montmorillonites, both the position of the antisymmetric and symmetric stretching bands shift to higher wavenumbers, indicating the decrease of conformational ordering.

ID Code:	844
Item Type:	Journal Article
Additional Information :	For more information, please refer to the journal's website (see hypertext link) or contact the author.
Keywords :	Raman spectroscopy, ordering conformation, intercalated organo, montmorillonite
ISSN:	0377-0486
Subjects:	Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions:	QUT Faculties and Divisions > Faculty of Science
Copyright Owner :	Copyright 2004 John Wiley & Sons
Deposited On:	15 Mar 2005
Last Modified:	03 Dec 2008 12:10

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