Artículo
Modeling the Zeta Potential of Silica Capillaries in Relation to the Background Electrolyte Composition
Fecha de publicación:
05/2003
Editorial:
Wiley VCH Verlag
Revista:
Electrophoresis
ISSN:
0173-0835
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A theoretical relation between the zeta potential of silica capillaries and the composition of the background electrolyte (BGE) is presented in order to be used in capillary zone electrophoresis (CZE). This relation is derived on the basis of Poisson- Boltzmann equation and considering the equilibrium dissociation of silanol groups at the capillary wall as the mechanism of charge generation. Therefore, the resulting model involves the relevant physicochemical parameters of the BGE-capillary interface. Special attention is centered in the characterization of the BGE, which can be either salt or/and buffer solutions. The model is successfully applied to electroosmotic flow (EOF) experimental data of different aqueous solutions, covering a wide range of pH and ionic strength. Numerical predictions are also presented showing the capability of the model to quantify the EOF, the control of which is relevant to improve analyte separation performance in CZE.
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Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
Berli, Claudio Luis Alberto; Piaggio, María Virginia; Deiber, Julio Alcides; Modeling the Zeta Potential of Silica Capillaries in Relation to the Background Electrolyte Composition; Wiley VCH Verlag; Electrophoresis; 24; 5-2003; 1587-1595
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