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Expansion of Smectite by Hexadecyltrimethylammonium

Published online by Cambridge University Press:  01 January 2024

Seung Yeop Lee  and
Soo Jin Kim
Seung Yeop Lee*
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea
Soo Jin Kim
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea
*
*E-mail address of corresponding author: lsyblue@hanmir.com
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Abstract

The adsorption of hexadecyltrimethylammonium (HDTMA) in smectite was studied by adsorption isotherms, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Smectites that had reacted for 48 h with HDTMA cations equivalent to 0.2–3.0 times the cation exchange capacity (CEC) were converted to HDTMA-exchanged smectites with various d-spacings. Study of HDTMA-smectites by HRTEM suggests that the HDTMA adsorption results in interlayer expansion with various d-spacings and irregular wavy layer structures. We believe that HDTMA loading beyond the CEC of smectite affects the structure of clay by the additional adsorption of HDTMA-Br− via hydrophobic bonding. Surfactant orientation probably depends on the quantity of surfactant in the interlayer. Our TEM study shows that the structure of the adsorbed HDTMA layer in the interlayers of smectite depends on the charge distribution and chemical composition of smectite.

Keywords

AdsorptionHexadecyltrimethylammoniumHigh-resolution Transmission Electron MicroscopyInterlayersSmectiteSurfactant
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 4 , August 2002 , pp. 435 - 445
Copyright
Copyright © 2002, The Clay Minerals Society

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