This work describes the basic structural features, the origin and properties of clay minerals and of interstratified clays in order to outline the kinetics of structural changes induced by clay-water and clay- ionic solutions interactions. The role of layer charge is discussed because it is recognized as one of the most important features of 2:1 phyllosilicates that produce the mineral ability to retain cations and to adsorb water and various polar molecules. Sample preparation techniques in order to obtain a representative clay-mineral for structural X-ray analysis, such as chemical pre-treatment and preparation of oriented clay mineral aggregates was also considered. A special focus was devoted to water-bearing clay minerals. In 2:1 layer and in 1:1 structures water occurs in interlayer positions and forms complexes with interlayer cations which are affected by P-T and chemical environmental conditions. Some examples of polluted environment remediation were reported in order to enhance clay mineral properties as barrier in environmental pollution.
|Data di pubblicazione:||2002|
|Titolo:||Effect of ionic solutions on clay minerals crystal chemistry.|
|Autori:||M. BRIGATTI; MEDICI L.; POPPI L.|
|Titolo del libro:||Chemo-Mechanical Coupling in Clays: From Nano-Scale to Engineering Applications|
|Appare nelle tipologie:||Capitolo/Saggio|
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