Electrical Double Layer on Silver Iodide and Overcharging in the Presence of Hydrolyzable CationsReportar como inadecuado




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Croatica Chemica Acta, Vol.80 No.3-4 November 2007. -

Previous studies on the surface charge and electrokinetic charge on silver iodide as a function of the pAg in the presence of some monovalent and trivalent cations as the counterions were extended to include the influence of pH. The main reason for this study was to investigate the possible propensity of overcharging by adsorption of hydrolyzed counterions. It was found that for K+ as the counterion the double layer properties could be well represented in terms of a simple Gouy-Stern model, without accounting for hydrolysis. However, with Al3+ or La3+ as the counterions, adsorption of hydrolyzed species takes place when the pH is high enough, leading to electrokinetic charge reversal.

electrical double layer; silver iodide; surface charge; overcharging; charge reversal; hydrolysis at interfaces



Autor: Johannes Lyklema - ; Department of Physical Chemistry and Colloid Science, Wageningen University, Wageningen, Netherlands Tatiana

Fuente: http://hrcak.srce.hr/



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