scholarly journals Highly Ordered Anodic Alumina Nanofibers Fabricated via Two Distinct Anodizing Processes

2015 ◽  
Vol 4 (5) ◽  
pp. H14-H17 ◽  
Author(s):  
D. Nakajima ◽  
T. Kikuchi ◽  
S. Natsui ◽  
R. O. Suzuki
Keyword(s):  
Anodic Alumina ◽  
Alumina Nanofibers

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

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2271
Author(s):  
Mikhail Pashchanka
Keyword(s):  
Film Growth ◽  
Theoretical Models ◽  
Anodic Alumina ◽  
Transport Processes ◽  
Self Organization ◽  
Anodized Aluminum ◽  
Hierarchical Pores ◽  
Alumina Nanofibers ◽  
Current Voltage ◽  
Experimental Findings

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.

Formation of ordered anodic alumina nanofibers during aluminum anodizing in oxalic acid at high voltage and electrical power

2020 ◽  
Vol 394 ◽  
pp. 125813
Author(s):  
K. Chernyakova ◽  
A. Ispas ◽  
R. Karpicz ◽  
G. Ecke ◽  
I. Vrublevsky ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
High Voltage ◽  
Electrical Power ◽  
Anodic Alumina ◽  
Alumina Nanofibers ◽  
Aluminum Anodizing

scholarly journals Fabrication of a novel aluminum surface covered by numerous high-aspect-ratio anodic alumina nanofibers

2015 ◽  
Vol 356 ◽  
pp. 54-62 ◽  
Author(s):  
Daiki Nakajima ◽  
Tatsuya Kikuchi ◽  
Shungo Natsui ◽  
Norihito Sakaguchi ◽  
Ryosuke O. Suzuki
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Anodic Alumina ◽  
Aluminum Surface ◽  
Alumina Nanofibers

scholarly journals Ultra-High Density Single Nanometer-Scale Anodic Alumina Nanofibers Fabricated by Pyrophosphoric Acid Anodizing

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Tatsuya Kikuchi ◽  
Osamu Nishinaga ◽  
Daiki Nakajima ◽  
Jun Kawashima ◽  
Shungo Natsui ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
High Density ◽  
Nanometer Scale ◽  
Alumina Nanofibers ◽  
Pyrophosphoric Acid

Superhydrophilicity of novel anodic alumina nanofibers films and their formation mechanism

2017 ◽  
Vol 4 (6) ◽  
pp. 065007 ◽  
Author(s):  
Rong Peng ◽  
Wulin Yang ◽  
Licai Fu ◽  
Jiajun Zhu ◽  
Deyi Li ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Anodic Alumina ◽  
Alumina Nanofibers

Fabrication of Nanoscale Hydrophobic Regions on Anodic Alumina for Selective Adhesion of Biologic Molecules

2003 ◽  
Vol 773 ◽  
Author(s):  
Xiefan Lin ◽  
Anthony S. W. Ham ◽  
Natalie A. Villani ◽  
Whye-Kei Lye ◽  
Qiyu Huang ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Biological Molecules ◽  
Spatial Density ◽  
Length Scale ◽  
Adhesion Sites ◽  
A Cell ◽  
Adhesive Molecules ◽  
Receptor Clusters ◽  
Molecular Bonding ◽  
Fabrication Parameters

AbstractStudies of selective adhesion of biological molecules provide a path for understanding fundamental cellular properties. A useful technique is to use patterned substrates, where the pattern of interest has the same length scale as the molecular bonding sites of a cell, in the tens of nanometer range. We employ electrochemical methods to grow anodic alumina, which has a naturally ordered pore structure (interpore spacing of 40 to 400 nm) controlled by the anodization potential. We have also developed methods to selectively fill the alumina pores with materials with contrasting properties. Gold, for example, is electrochemically plated into the pores, and the excess material is removed by backsputter etching. The result is a patterned surface with closely separated islands of Au, surrounded by hydrophilic alumina. The pore spacing, which is determined by fabrication parameters, is hypothesized to have a direct effect on the spatial density of adhesion sites. By attaching adhesive molecules to the Au islands, we are able to observe and study cell rolling and adhesion phenomena. Through the measurements it is possible to estimate the length scale of receptor clusters on the cell surface. This information is useful in understanding mechanisms of leukocytes adhesion to endothelial cells as well as the effect of adhesion molecules adaptation on transmission of extracellular forces. The method also has applications in tissue engineering, drug and gene delivery, cell signaling and biocompatibility design.

Fabrication of Fe nanowires using anodic alumina template

2017 ◽  
Author(s):  
yongson hong ◽  
O Pong-Sik ◽  
Ryang Se-Hun ◽  
Sin Kum-Chol ◽  
Ri Un-Byol
Keyword(s):  
Magnetic Property ◽  
Deposition Time ◽  
Anodic Alumina ◽  
Aao Template ◽  
Alumina Template ◽  
Deposition Voltage ◽  
Temperature Deposition ◽  
Anodic Alumina Template

In this paper, we considered fabrication of Fe nanowires by AAO template, magnetic property, and influences (fabrication voltage of template, temperature, deposition time, and deposition voltage) on them. <br>

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