Viscosity Effects in Thin-Layer Electrodeposition

We present experimental results and a theoretical macroscopic model on the effects of viscosity in thin-layer electrochemical growth. The viscosity was changed through glycerol additions; simultaneous use was made of optical and schlieren techniques for tracking concentration and convective fronts,...

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Autores principales: Gonzalez, Graciela Alicia, Molina, Fernando Victor, Dengra, Silvina
Publicado: 2001
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v148_n7_pC479_Gonzalez
http://hdl.handle.net/20.500.12110/paper_00134651_v148_n7_pC479_Gonzalez
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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_00134651_v148_n7_pC479_Gonzalez2023-06-08T14:35:42Z Viscosity Effects in Thin-Layer Electrodeposition Gonzalez, Graciela Alicia Molina, Fernando Victor Dengra, Silvina We present experimental results and a theoretical macroscopic model on the effects of viscosity in thin-layer electrochemical growth. The viscosity was changed through glycerol additions; simultaneous use was made of optical and schlieren techniques for tracking concentration and convective fronts, while pH indicators were used for migratory fronts. The theoretical model describes diffusive, migratory, and convective ion transport in a fluid subject to an electric field. The equations are written in terms of dimensionless quantities, in particular, the Migration, Peclet, Poisson, Reynolds, and electrical Grashof numbers, which are found to depend on viscosity. Experiments reveal that with increasing viscosity, convection decreases, concentration profiles are less pronounced, while electric resistance and voltage increase. Concentration and convective fronts slow down with viscosity, but their time scaling follows the same law as for solutions without glycerol, only differing by a constant. Moreover, under constant electrical current, an increase in viscosity yields slower deposit front velocities, a more uniform deposit with smaller separation between branches, i.e., a change in morphology from more separated compact trees to a more dense, fractal-like structure. © 2001 The Electrochemical Society. [DOI: 10.1149/1.1377280] All rights reserved. Fil:Gonzalez, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Dengra, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v148_n7_pC479_Gonzalez http://hdl.handle.net/20.500.12110/paper_00134651_v148_n7_pC479_Gonzalez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We present experimental results and a theoretical macroscopic model on the effects of viscosity in thin-layer electrochemical growth. The viscosity was changed through glycerol additions; simultaneous use was made of optical and schlieren techniques for tracking concentration and convective fronts, while pH indicators were used for migratory fronts. The theoretical model describes diffusive, migratory, and convective ion transport in a fluid subject to an electric field. The equations are written in terms of dimensionless quantities, in particular, the Migration, Peclet, Poisson, Reynolds, and electrical Grashof numbers, which are found to depend on viscosity. Experiments reveal that with increasing viscosity, convection decreases, concentration profiles are less pronounced, while electric resistance and voltage increase. Concentration and convective fronts slow down with viscosity, but their time scaling follows the same law as for solutions without glycerol, only differing by a constant. Moreover, under constant electrical current, an increase in viscosity yields slower deposit front velocities, a more uniform deposit with smaller separation between branches, i.e., a change in morphology from more separated compact trees to a more dense, fractal-like structure. © 2001 The Electrochemical Society. [DOI: 10.1149/1.1377280] All rights reserved.
author Gonzalez, Graciela Alicia
Molina, Fernando Victor
Dengra, Silvina
spellingShingle Gonzalez, Graciela Alicia
Molina, Fernando Victor
Dengra, Silvina
Viscosity Effects in Thin-Layer Electrodeposition
author_facet Gonzalez, Graciela Alicia
Molina, Fernando Victor
Dengra, Silvina
author_sort Gonzalez, Graciela Alicia
title Viscosity Effects in Thin-Layer Electrodeposition
title_short Viscosity Effects in Thin-Layer Electrodeposition
title_full Viscosity Effects in Thin-Layer Electrodeposition
title_fullStr Viscosity Effects in Thin-Layer Electrodeposition
title_full_unstemmed Viscosity Effects in Thin-Layer Electrodeposition
title_sort viscosity effects in thin-layer electrodeposition
publishDate 2001
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v148_n7_pC479_Gonzalez
http://hdl.handle.net/20.500.12110/paper_00134651_v148_n7_pC479_Gonzalez
work_keys_str_mv AT gonzalezgracielaalicia viscosityeffectsinthinlayerelectrodeposition
AT molinafernandovictor viscosityeffectsinthinlayerelectrodeposition
AT dengrasilvina viscosityeffectsinthinlayerelectrodeposition
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