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The Kinetics of Montmorillonite Expansion in the Treatment with Hexadecyltrimethylammonium  

Lee Seung Yeop (한국원자력연구소 방사성폐기물처분연구부)
Cho Won Jin (한국원자력연구소 방사성폐기물처분연구부)
Publication Information
Journal of the Mineralogical Society of Korea / v.17, no.4, 2004 , pp. 299-307 More about this Journal
Abstract
Surfactant adsorption by two montmorillonite types with different interlayer cations of Ca and Na was characterized by examining the time dependence of surfactant behavior on the clay surfaces. Surfactants with different micelle concentration were conducted in our experiment to observe a nonequilibrium activity of cationic surfactant on the clay over reaction periods ranging from 0.1 min to 11 days. As compared with Ca-montmorillonite (SAz), a more active intrusion of surfactant molecules into the interlayers was found in Na-montmorillonite (SWy). During a short 'initiation' stage, the basal spacing of SWy montmorillonite increased rapidly with logarithmic time. For SAz montmorillonite, however, the abrupt basal spacing increase occurred at the later stage of the reaction. From the result, the difference in the adsorption behavior exhibited by the two montmorillonite types partly results from their intrinsic nature, that is, inorganic cations originally existing on the clay surfaces. Additionally, the micelle concentration of surfactants affects the development of organo-montmorillonite, especially, in the intercalant formation and stabilization under nonequilibrium.
Keywords
interlayers; micelle; montmorillonite; nonequilibrium; surfactant adsorption;
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