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Abstract:

Steel samples were passivated in 0.1 M NaOH solutions at 0.3 V vs. Ag/AgCl (3 M KC1) and then poly(allylamine) derivatized with osmium pyridine- bipyridine-chloride complex and poly-(vinylsulfonate) were sequentially self-assembled electrostatically layer-by-layer. The resulting electrodes were examined by cyclic voltammetry, ellipsometry, and X-ray Photoelectron Spectroscopy (XPS). These studies demonstrate the formation of a redox polyelectrolyte multilayer onto the passive film protecting the ferrous metal. As the number of deposited polyelectrolyte layers increases there is an increase in the measured thickness of the self-assembled film. The rate of thickness growth in osmium polymer film with the number of deposition cycles is slower for films thinner than ~30 nm. Cyclic voltammetry shows that the electron transfer rate to the outer sphere osmium complex tethered to the polymer backbone is much slower for the multilayer on passive iron than on gold surfaces. This is in agreement with the well-known behavior of soluble redox couples on passive metals and with electrochemical tunelling spectroscopy.

Registro:

Documento: Artículo
Título:Layer-by-layer self-assembled redox polyelectrolytes on passive steel
Autor:Völker, E.; Calvo, E.J.; Williams, F.J.
Filiación:Departamento de Química Inorgdnica, Analítica y Quimica Física, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Departmento de Quimica de Superficies y Recubirmientos, Tenaris Siderca, Simini 250, Campana, Buenos Aires B2804MHA, Argentina
Año:2008
Volumen:48
Número:3-4
Página de inicio:305
Página de fin:312
DOI: http://dx.doi.org/10.1560/IJC.48.3-4.305
Título revista:Israel Journal of Chemistry
Título revista abreviado:Isr. J. Chem.
ISSN:00212148
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00212148_v48_n3-4_p305_Volker

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Citas:

---------- APA ----------
Völker, E., Calvo, E.J. & Williams, F.J. (2008) . Layer-by-layer self-assembled redox polyelectrolytes on passive steel. Israel Journal of Chemistry, 48(3-4), 305-312.
http://dx.doi.org/10.1560/IJC.48.3-4.305
---------- CHICAGO ----------
Völker, E., Calvo, E.J., Williams, F.J. "Layer-by-layer self-assembled redox polyelectrolytes on passive steel" . Israel Journal of Chemistry 48, no. 3-4 (2008) : 305-312.
http://dx.doi.org/10.1560/IJC.48.3-4.305
---------- MLA ----------
Völker, E., Calvo, E.J., Williams, F.J. "Layer-by-layer self-assembled redox polyelectrolytes on passive steel" . Israel Journal of Chemistry, vol. 48, no. 3-4, 2008, pp. 305-312.
http://dx.doi.org/10.1560/IJC.48.3-4.305
---------- VANCOUVER ----------
Völker, E., Calvo, E.J., Williams, F.J. Layer-by-layer self-assembled redox polyelectrolytes on passive steel. Isr. J. Chem. 2008;48(3-4):305-312.
http://dx.doi.org/10.1560/IJC.48.3-4.305