2024-03-29T00:17:59Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/243492022-06-24T07:55:15Zcom_10261_129com_10261_6col_10261_382
2010-05-17T08:07:11Z
urn:hdl:10261/24349
Surface instability of Serpentine in Aqueous Suspensions
Tartaj, Pedro
Cerpa, Arisbel
García-González, M. T.
Serna Pereda, Carlos J.
Electrophoretic mobility
Surface properties
Serpentine
Dissolution
6 pages, figures, and tables statistics.
The 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
2010-05-17T08:07:11Z
2010-05-17T08:07:11Z
2000
artículo
Journal of Colloid and Interface Science 231:176-181 (2000)
0021-9797
http://hdl.handle.net/10261/24349
eng
10.1006/jcis.2000.7109
closedAccess
Academic Press