Mg-Exchanged Montmorillonite Undergoing External Environmental Solicitation: Crystalline Swelling Process Investigation
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This work reports a characterization of the possible effects that might affect the hydration properties of Mg-exchanged low-charge montmorillonite (SWy-2-Mg) when undergoes an external environmental solicitation. The latter was created by an alteration of relative humidity rates (i.e. RH%) over two hydration-dehydration cycles with different sequence. The study was mainly based on the X-ray diffraction profile modeling approach. Obtained results show strong hydration dependence as a function of the RH sequence. The interlayer configuration presents a heterogeneous hydration behavior which was systematically observed at different stages of both cycles. The interlayer water uptake process presents similar hysteresis characterized by fluctuations of interlayer water molecule abundances.
KeywordsClay mineral Ion exchange process Environmental solicitation XRD profile modeling approach
- 8.Tessier, D. : Etude expérimentale de l’organisation des matériaux argileux. [these], Université de Paris VII, Publication INRA Versailles, Paris, France (1984)Google Scholar