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Dehydration behaviour hexadecyltrimethylammonium-exchanged smectite

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Abstract:

The dehydration of hexadecyltrimethylammonium (HDTMA)-exchanged smectites has been studied using X-ray diffractometry (XRD) and differential scanning calorimetry (DSC).The basal spacing of hydrated HDTMA-smectites changed with temperature. The 2.5 HDTMA-smectite (i.e.smectite treated with HDTMA equivalent to 2.5 times the CEC) showed a continuous increase in its basal spacing during dehydration up to 200ÂșC, while the 1.2 HDTM A-smectite showed a significant decrease in basal spacing. It is assumed that the less ordered alkyl chains in the wet state in the interlayer region may be rearranged to ordered chains (e.g. all-trans conformation) during sequential dehydration. This results in a decrease in interlayer spacing in the phase with low organic packing density and a flat-lying array (i.e.1.2 HDTMA-smectite), and a gradual increase in the basal spacing when the chains have a vertical configuration (2.5 HDTM A-smectite).

Keywords: DEHYDRATION; DIFFERENTIAL SCANNING CALORIMETRY; HEXADECYLTRIMETHYLAMMONIUM; INTERLAYER; SMECTITE; X-RAY DIFFRACTOMETRY

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/0009855033820091

Publication date: June 1, 2003

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minsoc/cm/2003/00000038/00000002/art00008
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