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

Published online by Cambridge University Press:  01 January 2024

Hongping He ,
Ray L. Frost ,
Feng Deng ,
Jianxi Zhu ,
Xiaoyan Wen  and
Peng Yuan
Hongping He*
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia National Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan 430071, China
Ray L. Frost
Affiliation:
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD 4001, Australia
Feng Deng
Affiliation:
National Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan 430071, China
Jianxi Zhu
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China National Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan 430071, China
Xiaoyan Wen
Affiliation:
National Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan 430071, China
Peng Yuan
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China National Laboratory of Magnetic Resonance and Atom and Molecular Physics, Wuhan Institute of Physics, Chinese Academy of Sciences, Wuhan 430071, China
*
*E-mail address of corresponding author: hehp@gig.ac.cn
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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.

Keywords

13C MAS NMRConformationMontmorilloniteSurfactant
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 3 , June 2004 , pp. 350 - 356
Copyright
Copyright © 2004, The Clay Minerals Society

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