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Thermal Characterization of Surfactant-Modified Montmorillonites

Published online by Cambridge University Press:  01 January 2024

Hongping He ,
Zhe Ding ,
Jianxi Zhu ,
Pen Yuan ,
Yunfei Xi ,
Dan Yang  and
Ray L. Frost
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, PO Box 2434 GPO, Brisbane, QLD 4001, Australia
Zhe Ding
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, PO Box 2434 GPO, Brisbane, QLD 4001, Australia
Jianxi Zhu
Affiliation:
Department of Environment Science, Xixi Campus, Zhejiang University, 148 Tianmushan Street, Hangzhou, Zhejiang, China 310028
Pen Yuan
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China
Yunfei Xi
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China
Dan Yang
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou 510640, China
Ray L. Frost
Affiliation:
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, PO Box 2434 GPO, Brisbane, QLD 4001, Australia
*
*E-mail address of corresponding author: hehp@gig.ac.cn
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Abstract

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The thermal stability of surfactant-modified clays plays a key role in the synthesis and processing of organoclay-based nanocomposites. Differential thermal analysis (DTA), thermogravimetric measurement and differential scanning calorimetry (DSC) were used in this study to characterize the thermal stability of hexadecyltrimethylammonium bromide-modified montmorillonites prepared at different surfactant concentrations. Analysis by DSC shows that the molecular environment of the surfactant within the montmorillonite galleries is different from that in the bulk state. The endothermic peak at 70–100°C in the DTA curves of the modified montmorillonites is attributed to both the surfactant phase transformation and the loss of free and interlayer water. With an increase of surfactant-packing density, the amount of water residing in the modified montmorillonite decreases gradually, reflecting the improvement of the hydrophobic property for the organoclay. However, the increase in the surfactant packing density within the galleries leads to a decrease in the thermal stability of the organoclays.

With an increase of initial surfactant concentration for the preparation of organoclays, the surfactant- packing density increases gradually to a ‘saturated’ state. It was found that the cationic surfactant was introduced into the montmorillonite interlayer not only by cation exchange but also by physical adsorption.

Keywords

DSCDTASurfactant-modified MontmorilloniteThermal StabilityTG
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 3 , June 2005 , pp. 287 - 293
Copyright
Copyright © The Clay Minerals Society 2005

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