Dehydration Characteristics of Cationic Surfactant-Modified Montmorillonite

양이온성 계면활성제로 표면개질된 몬모릴로나이트의 탈수 특성

  • Seung Yeop Lee (School of Earth Environmental Sciences, Seouul National University) ;
  • Soo Jin Kim (School of Earth Environmental Sciences, Seouul National University)
  • Published : 2002.12.01


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.


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