Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride

The dealloying of β-brass in 0.5 M aqueous NaCl was studied by electrochemical techniques at different temperatures in the range 278 K ≤ T ≤ 318 K, complemented with in situ scanning tunneling microscopy (STM) imaging. In the potential region where the electrodissolution of zinc and the formation of...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Martín, H., Carro, P., Hernández Creus, A., Morales, J., Fernández, G., Esparza, P., González, S., Salvarezza, Roberto Carlos, Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Exactas
Química
β-Brass
Scanning tunneling microscopy
Electrodissolution
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/121359
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-121359
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
β-Brass
Scanning tunneling microscopy
Electrodissolution
spellingShingle Ciencias Exactas
Química
β-Brass
Scanning tunneling microscopy
Electrodissolution
Martín, H.
Carro, P.
Hernández Creus, A.
Morales, J.
Fernández, G.
Esparza, P.
González, S.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride
topic_facet Ciencias Exactas
Química
β-Brass
Scanning tunneling microscopy
Electrodissolution
description The dealloying of β-brass in 0.5 M aqueous NaCl was studied by electrochemical techniques at different temperatures in the range 278 K ≤ T ≤ 318 K, complemented with in situ scanning tunneling microscopy (STM) imaging. In the potential region where the electrodissolution of zinc and the formation of vacancies and copper islands take place, two different roughness regimes were distinguished. When dealloying involves only a few monolayers (ML) the process approaches a quasiuniform alloy electrodissolution, whereas after electrodissolution of more than 20 ML, void formation takes place. In both regimes the interface evolution was analyzed by applying the dynamic scaling method to in situ STM imaging data. The first roughness regime exhibits a stable interface consisting of copper-rich islands that coarsen with time according to a surface diffusion controlled process. The second roughness regime exhibits an unstable interface due to a curvature dependent corrosion rate enhancing zinc electrodissolution at cavities. The overall interface evolution is well-described by a differential stochastic equation containing an electrodissolution term and surface rearrangement terms related to surface diffusion and negative surface tension effect.
format Articulo
Articulo
author Martín, H.
Carro, P.
Hernández Creus, A.
Morales, J.
Fernández, G.
Esparza, P.
González, S.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_facet Martín, H.
Carro, P.
Hernández Creus, A.
Morales, J.
Fernández, G.
Esparza, P.
González, S.
Salvarezza, Roberto Carlos
Arvia, Alejandro Jorge
author_sort Martín, H.
title Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride
title_short Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride
title_full Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride
title_fullStr Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride
title_full_unstemmed Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces : Dealloying of β-Brass in Aqueous Sodium Chloride
title_sort interplay of surface diffusion and surface tension in the evolution of solid/liquid interfaces : dealloying of β-brass in aqueous sodium chloride
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/121359
work_keys_str_mv AT martinh interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT carrop interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT hernandezcreusa interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT moralesj interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT fernandezg interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT esparzap interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT gonzalezs interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT salvarezzarobertocarlos interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
AT arviaalejandrojorge interplayofsurfacediffusionandsurfacetensionintheevolutionofsolidliquidinterfacesdealloyingofbbrassinaqueoussodiumchloride
bdutipo_str Repositorios
_version_ 1764820449174224898

Ejemplares similares