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Surface instability of Serpentine in Aqueous Suspensions

AutorTartaj, Pedro ; Cerpa, A.; García-González, M. T.; Serna Pereda, Carlos J.
Palabras claveElectrophoretic mobility
Surface properties
Fecha de publicación2000
EditorAcademic Press
CitaciónJournal of Colloid and Interface Science 231:176-181 (2000)
ResumenThe electrokinetic behavior and stability of aqueous suspensions containing serpentine minerals of different deposits have been studied. Crystallochemical analyses carried out by X-ray diffraction, IR spectroscopy, TEM, DTA/TG, and XRF revealed that all samples are lizardite-type serpentines with a similar chemical composition. It has been determined that the electrokinetic behavior of lizardite aqueous suspensions is mainly a function of the Mg/Si atomic ratio on surface. So, the low isoelectric point observed in some samples has been linked to values of this ratio lower than that of the ideal lizardite (Mg/Si D 1.5). Dissolution studies have shown that the removal of Mg cations from the solid at speeds faster than that theoretically expected (Mg/Si D 1.5), i.e., incongruent dissolution, is responsible for the enrichment of Si cations on surface. Therefore, it has been clearly established that the surface charge value developed in the lizardite/aqueous electrical interface is a function of the lizardite surface alteration grade
Descripción6 pages, figures, and tables statistics.
Versión del editor10.1006/jcis.2000.7109
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