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Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces

Over the past few years, researchers have made numerous breakthroughs in the field of aluminum anodizing and faced the problem of the lack of adequate theoretical models for the interpretation of some new experimental findings. For instance, spontaneously formed anodic alumina nanofibers and petal-l...

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Autor principal: Pashchanka, Mikhail
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8468298/
https://www.ncbi.nlm.nih.gov/pubmed/34578587
http://dx.doi.org/10.3390/nano11092271
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author Pashchanka, Mikhail
author_facet Pashchanka, Mikhail
author_sort Pashchanka, Mikhail
collection PubMed
description Over the past few years, researchers have made numerous breakthroughs in the field of aluminum anodizing and faced the problem of the lack of adequate theoretical models for the interpretation of some new experimental findings. For instance, spontaneously formed anodic alumina nanofibers and petal-like patterns, flower-like structures observed under AC anodizing conditions, and hierarchical pores whose diameters range from several nanometers to sub-millimeters could be explained neither by the classical field-assisted dissolution theory nor by the plastic flow model. In addition, difficulties arose in explaining the basic indicators of porous film growth, such as the nonlinear current–voltage characteristics of electrochemical cells or the evolution of hexagonal pore patterns at the early stages of anodizing experiments. Such a conceptual crisis resulted in new multidisciplinary investigations and the development of novel theoretical models, whose evolution is discussed at length in this review work. The particular focus of this paper is on the recently developed electroconvection-based theories that allowed making truly remarkable advances in understanding the porous anodic alumina formation process in the last 15 years. Some explanation of the synergy between electrode reactions and transport processes leading to self-organization is provided. Finally, future prospects for the synthesis of novel anodic architectures are discussed.
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spelling pubmed-84682982021-09-27 Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces Pashchanka, Mikhail Nanomaterials (Basel) Review Over the past few years, researchers have made numerous breakthroughs in the field of aluminum anodizing and faced the problem of the lack of adequate theoretical models for the interpretation of some new experimental findings. For instance, spontaneously formed anodic alumina nanofibers and petal-like patterns, flower-like structures observed under AC anodizing conditions, and hierarchical pores whose diameters range from several nanometers to sub-millimeters could be explained neither by the classical field-assisted dissolution theory nor by the plastic flow model. In addition, difficulties arose in explaining the basic indicators of porous film growth, such as the nonlinear current–voltage characteristics of electrochemical cells or the evolution of hexagonal pore patterns at the early stages of anodizing experiments. Such a conceptual crisis resulted in new multidisciplinary investigations and the development of novel theoretical models, whose evolution is discussed at length in this review work. The particular focus of this paper is on the recently developed electroconvection-based theories that allowed making truly remarkable advances in understanding the porous anodic alumina formation process in the last 15 years. Some explanation of the synergy between electrode reactions and transport processes leading to self-organization is provided. Finally, future prospects for the synthesis of novel anodic architectures are discussed. MDPI 2021-08-31 /pmc/articles/PMC8468298/ /pubmed/34578587 http://dx.doi.org/10.3390/nano11092271 Text en © 2021 by the author. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Review
Pashchanka, Mikhail
Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces
title Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces
title_full Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces
title_fullStr Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces
title_full_unstemmed Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces
title_short Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces
title_sort conceptual progress for explaining and predicting self-organization on anodized aluminum surfaces
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8468298/
https://www.ncbi.nlm.nih.gov/pubmed/34578587
http://dx.doi.org/10.3390/nano11092271
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