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Dehydration Characteristics of Cationic Surfactant-Modified Montmorillonite  

Seung Yeop Lee (School of Earth Environmental Sciences, Seouul National University)
Soo Jin Kim (School of Earth Environmental Sciences, Seouul National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.15, no.4, 2002 , pp. 305-314 More about this Journal
Abstract
The dehydration of hexadecyltrimethylammonium (HDTMA)-exchanged montmorillonite has been studied using X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The dehydration in HDTMA-montmorillonite seems to influence the swelling behavior of the organo-clay during heating. The basal d(001) spacing vs temperature curve of the HDTMA-montmorillonite has one broad swelling edge with a shoulder on the low-temperature side. We believe that the shoulder at $100^{\circ}C$ for the HDTMA-montmorillonite is due to interlayer swelling induced by the initial rearrangement of surfactants, and the second edge at $200^{\circ}C$ is caused by interlayer swelling resulting from the secondary vertical reorientation of alkyl chains. It seems that the dehydration of organo-clay induces a reorientation of the alkyl chains by transition to more vertical position relative to the silicate sheets, allowing instantly greater d-spacing.
Keywords
dehydration; hexadecyltrimethylammonium; X-ray diffractometry; differential scanning calorimetry; swelling; organo-clay; HDTMA;
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