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Conformation of surfactant molecules in the interlayer of montmorillonite studied by 13C MAS NMR

He, Hongping, Frost, Ray L., Deng, Feng, Zhu, Jianxi, Wen, Xiaoyan, & Yuan, Peng (2004) Conformation of surfactant molecules in the interlayer of montmorillonite studied by 13C MAS NMR. Clays and Clay Minerals, 52(3), pp. 350-356.

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Abstract

The ordering conformation of surfactant molecules in intercalated montmorillonite prepared at various concentrations has been investigated by 13C MAS NMR. The 13C MAS NMR study demonstrates the coexistence of ordered and disordered chain conformations. Two main resonance peaks are associated with the backbone alkyl chains: the resonance at 33 ppm corresponds to the ordered conformation (all-trans), and the resonance at 30 ppm corresponds to the disordered conformation (mixture of trans and gauche). The deconvolution of 13C MAS NMR spectra indicates that the ordering conformation of surfactant molecules within the gallery of montmorillonite strongly depends on their orientation and packing density. When amine chains have orientation parallel to the silicate layers, the amount of all-trans conformer decreases with the increase of amine concentration. However, the amount of all-trans conformer increases with the increase of amine concentration when amine chains radiate from the silicate layers. Furthermore, 13C MAS NMR spectra show that the intercalated surfactant molecules in the clay minerals never attained the complete liquidlike or solidlike behaviour.

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ID Code: 1473
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website (see link) or contact the author. Ray Frost: r.frost@qut.edu.au or Hongping He: hehp@gig.ac.cn
Keywords: Conformation, Surfactant, Montmorillonite, 13C MAS NMR
DOI: 10.1346/CCMN.2004.0520310
ISSN: 0009-8604
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Clay Minerals Society
Deposited On: 18 Oct 2005
Last Modified: 02 Mar 2012 12:10

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