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Conformation of Surfactant Molecules in the Interlayer of Montmorillonite Studied by 13C MAS NMR

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Clays and Clay Minerals

Abstract

The ordering conformation of surfactant molecules in intercalated montmorillonite prepared at various concentrations was 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). Deconvolution of 13C MAS NMR spectra indicates that the ordering conformation of surfactant molecules within the gallery of montmorillonite depends very much on their orientation and packing density. When amine chains are oriented 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 behavior.

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Authors and Affiliations

  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou, 510640, China

    Hongping He, Jianxi Zhu & Peng Yuan

  2. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Hongping He & Ray L. Frost

  3. Wuhan Institute of Physics, Chinese Academy of Sciences, National Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan, 430071, China

    Hongping He, Feng Deng, Jianxi Zhu, Xiaoyan Wen & Peng Yuan

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  1. Hongping He
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  2. Ray L. Frost
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  3. Feng Deng
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  4. Jianxi Zhu
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Correspondence to Hongping He.

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He, H., Frost, R.L., Deng, F. et al. Conformation of Surfactant Molecules in the Interlayer of Montmorillonite Studied by 13C MAS NMR. Clays Clay Miner. 52, 350–356 (2004). https://doi.org/10.1346/CCMN.2004.0520310

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  • DOI: https://doi.org/10.1346/CCMN.2004.0520310

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