Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury

In this work the influence of several factors on the adherence of hematite particles onto mercury electrodes is studied through capacitance, C, measurements at different applied potentials, E. The C/E relationship shows two maxima at potentials more positive and more negative with respect to the zer...

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Publicado: 1994
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v165_n2_p459_Andrade
http://hdl.handle.net/20.500.12110/paper_00219797_v165_n2_p459_Andrade
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00219797_v165_n2_p459_Andrade2023-06-08T14:44:52Z Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury In this work the influence of several factors on the adherence of hematite particles onto mercury electrodes is studied through capacitance, C, measurements at different applied potentials, E. The C/E relationship shows two maxima at potentials more positive and more negative with respect to the zero charge potential of the bare metal. The pH dependence of the capacity maxima shows an inflection point at a pH of about 4. The capacitance increases with ionic strength. The C/E curve depends markedly on the nature of the anion present in the electrolyte. In the potential range between the maxima, the capacitance depends on the potential in an approximately parabolic way. The number of attached particles as a function of hematite concentration in solution shows an adsorption isotherm-like behavior. The experimental findings can be rationalized in terms of the influence of the different variables on the electrochemical free energy of adhesion. © 1994 by Academic Press, Inc. 1994 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v165_n2_p459_Andrade http://hdl.handle.net/20.500.12110/paper_00219797_v165_n2_p459_Andrade
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description In this work the influence of several factors on the adherence of hematite particles onto mercury electrodes is studied through capacitance, C, measurements at different applied potentials, E. The C/E relationship shows two maxima at potentials more positive and more negative with respect to the zero charge potential of the bare metal. The pH dependence of the capacity maxima shows an inflection point at a pH of about 4. The capacitance increases with ionic strength. The C/E curve depends markedly on the nature of the anion present in the electrolyte. In the potential range between the maxima, the capacitance depends on the potential in an approximately parabolic way. The number of attached particles as a function of hematite concentration in solution shows an adsorption isotherm-like behavior. The experimental findings can be rationalized in terms of the influence of the different variables on the electrochemical free energy of adhesion. © 1994 by Academic Press, Inc.
title Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
spellingShingle Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
title_short Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
title_full Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
title_fullStr Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
title_full_unstemmed Adhesion of colloidal hematite onto metallic surfaces II. Influence of electrode potential, pH, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
title_sort adhesion of colloidal hematite onto metallic surfaces ii. influence of electrode potential, ph, ionic strength, colloid concentration, and nature of the electrolyte on the adhesion on mercury
publishDate 1994
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v165_n2_p459_Andrade
http://hdl.handle.net/20.500.12110/paper_00219797_v165_n2_p459_Andrade
_version_ 1768546193663590400

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