Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels

The formation of silver patterns via electrolysis from aqueous silver sulfate + x% w/v agarose sol and gel media, with and without supporting electrolyte, in a quasi-two-dimensional (2D) cylindrical cell at room temperature, is utilized as a reference system to investigate the complexity of pinning...

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Autores principales: Pasquale, Miguel Ángel, Saracco, Gustavo Pablo, Marchiano, Susana Lucy, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Ciencias Exactas
Química
Electrolysis
Silver
Pinning effects
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121356
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121356
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Electrolysis
Silver
Pinning effects
spellingShingle Ciencias Exactas
Química
Electrolysis
Silver
Pinning effects
Pasquale, Miguel Ángel
Saracco, Gustavo Pablo
Marchiano, Susana Lucy
Arvia, Alejandro Jorge
Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels
topic_facet Ciencias Exactas
Química
Electrolysis
Silver
Pinning effects
description The formation of silver patterns via electrolysis from aqueous silver sulfate + x% w/v agarose sol and gel media, with and without supporting electrolyte, in a quasi-two-dimensional (2D) cylindrical cell at room temperature, is utilized as a reference system to investigate the complexity of pinning effects. From pattern morphology and electrochemical data, both delocalized and localized pinning in the bulk dominate the drift of the growth front, depending on the concentration of agarose in the heterogeneous media. Delocalized pinning results from mobile, small agarose aggregates at the growth front and from their accumulation by the front drift. For gels, localized pinning comes from their own percolated structure. A depinning/pinning transition is observed in going from sols to gels. The relative contribution of diffusion and advection in mass-transport-controlled silver electrodeposition depends on the plating bath composition. On the other hand, silver ion attachment to the cathode appears to be interfered with by some screening caused by weakly adsorbed, mobile agarose aggregates at the metal surface without slowing down the rate of the electron-transfer step at the cathode. Their relative contribution of a delocalized, localized pinning and screening effect to a great extent determines the morphology and transition in the growth mode of silver patterns in both media. The analysis of charge and current transients and the corresponding silver pattern morphologies for open and dense radial patterns is made. Results are qualitatively simulated with a novel, rather simple cellular automaton algorithm.
format Articulo
Articulo
author Pasquale, Miguel Ángel
Saracco, Gustavo Pablo
Marchiano, Susana Lucy
Arvia, Alejandro Jorge
author_facet Pasquale, Miguel Ángel
Saracco, Gustavo Pablo
Marchiano, Susana Lucy
Arvia, Alejandro Jorge
author_sort Pasquale, Miguel Ángel
title Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels
title_short Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels
title_full Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels
title_fullStr Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels
title_full_unstemmed Influence of Pinning Effects on the Electrochemical Formation of Silver Patterns in Agarose-Containing Sols and Gels
title_sort influence of pinning effects on the electrochemical formation of silver patterns in agarose-containing sols and gels
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/121356
work_keys_str_mv AT pasqualemiguelangel influenceofpinningeffectsontheelectrochemicalformationofsilverpatternsinagarosecontainingsolsandgels
AT saraccogustavopablo influenceofpinningeffectsontheelectrochemicalformationofsilverpatternsinagarosecontainingsolsandgels
AT marchianosusanalucy influenceofpinningeffectsontheelectrochemicalformationofsilverpatternsinagarosecontainingsolsandgels
AT arviaalejandrojorge influenceofpinningeffectsontheelectrochemicalformationofsilverpatternsinagarosecontainingsolsandgels
bdutipo_str Repositorios
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