Self-organized formation of hexagonal pore arrays in anodic alumina

1998 ◽  
Vol 72 (10) ◽  
pp. 1173-1175 ◽  
Author(s):  
O. Jessensky ◽  
F. Müller ◽  
U. Gösele
Keyword(s):  
Anodic Alumina ◽  
Self Organized

Sputter Deposition of Self-Organized Nanoclusters Through Porous Anodic Alumina Templates

2007 ◽  
Vol 7 (2) ◽  
pp. 641-646 ◽  
Author(s):  
Smita Gohil ◽  
Ramesh Chandra ◽  
Bhagyashree Chalke ◽  
Sangita Bose ◽  
Pushan Ayyub
Keyword(s):  
Ambient Pressure ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Average Pore ◽  
Self Organized ◽  
Atomic Force ◽  
Sputter Deposited ◽  
Anodic Alumina Templates ◽  
Hexagonally Ordered ◽  
Ordered Porous

Silver nanoparticles were sputter deposited through self organized hexagonally ordered porous anodic alumina templates that were fabricated using a two-step anodization process. The average pore diameter of the template was 90 nm and the interpore spacing was 120 nm. Atomic force microscope studies of the sputter-deposited silver nanoparticle array on a Si substrate indicate an approximate replication of the porous anodic alumina mask. The nature of the deposition depends strongly on the process parameters such as sputtering voltage, ambient pressure and substrate temperature. We report a detailed study of the sputtering conditions that lead to an optimal deposition through the template.

scholarly journals Etching the Oxide Barrier of Micrometer-Scale Self-Organized Porous Anodic Alumina Membranes

2015 ◽  
Vol 162 (4) ◽  
pp. E47-E50 ◽  
Author(s):  
Jonathan Bellemare ◽  
Louis-Philippe Carignan ◽  
Frédéric Sirois ◽  
David Ménard
Keyword(s):  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Alumina Membranes ◽  
Self Organized ◽  
Oxide Barrier ◽  
Micrometer Scale

Fabrication of Micrometer-Scale Self-Organized Pore Arrays in Anodic Alumina

2014 ◽  
Vol 161 (5) ◽  
pp. E75-E80 ◽  
Author(s):  
Jonathan Bellemare ◽  
Frédéric Sirois ◽  
David Ménard
Keyword(s):  
Anodic Alumina ◽  
Self Organized ◽  
Micrometer Scale

A Study of a New Ceramic Membrane for Use in Hemodialysis

2004 ◽  
Author(s):  
Zhongping Huang ◽  
Weiming Zhang ◽  
Sonja M. Tang ◽  
Jianping Yu ◽  
Stephen J. Lai-Fook ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Hydraulic Conductivity ◽  
Oxalic Acid ◽  
Pore Structure ◽  
Pore Size ◽  
Ceramic Membrane ◽  
Anodic Alumina ◽  
Pore Distribution ◽  
Self Organized ◽  
Hemodialysis Membrane

The non-uniformity of pore size and pore distribution of the current hemodialysis membrane results in low efficiency of uremic solute removal as well as the loss of albumin. By using nano technology, an anodic alumina membrane (ceramic membrane) with self-organized nano-pore structure was produced. The objective of this study was to investigate the correlation between various anodization conditions and the pore characteristics of the ceramic membrane as a potential use in artificial kidney / hemodialysis. An aluminum thin film was oxidized in two electrolytes consisting of 3% and 5% sulfuric acid and 2.7% oxalic acid. The applied voltages were 12.5, 15, 17.5 and 20 (V) for sulfuric acid and 20, 30, 40 and 50 (V) for oxalic acid. Pore size and porosity were determined by analyzing scanning electron microscopy (SEM) images and hydraulic conductivity was measured. Pore size increased linearly with voltage. Acid concentration affected pore formation but not pore size and pore distribution. Hydraulic conductivity of the ceramic membrane was higher than that of polymer dialysis membrane. The optimal formation conditions for self-organized nano-pore structure of ceramic membrane were 12.5–17.5V in 3–5% sulfuric acid at 0 °C. These conditions produced ceramic membranes with pores of ~ 10 nm diameter. Conclusion: Anodic alumina technology reliably produced in quantity structures with pore sizes in the 10–50 nm diameter range. Because of more uniform pore size, high porosity, high hydraulic conductivity and resistance to high temperature, the ceramic membrane has potential for future application as a hemodialysis membrane.

Effects of Annealing Treatment of Aluminum Substrate on Nanopore Arrangements in Anodic Alumina

2006 ◽  
Vol 118 ◽  
pp. 549-554 ◽  
Author(s):  
Han Jun Oh ◽  
Kyung Wook Jang ◽  
Jong Ho Lee ◽  
Beom Su Ki ◽  
Chang Hoe Heo ◽  
...  
Keyword(s):  
Annealing Treatment ◽  
Anodic Alumina ◽  
Aluminum Substrate ◽  
Alumina Template ◽  
Alumina Layer ◽  
Ordered Arrays ◽  
Self Organized ◽  
Annealing Conditions ◽  
Nanopore Arrays ◽  
The Relationship

Effects of annealing treatments of aluminum substrate for ordered nanopore arrays formed by self-organized anodization have been investigated. To observe the relationship between microstructures of aluminum substrate and nanopore regularity formed after anodization of the aluminum substrate, aluminum specimens were annealed at 300, 400, and 500 °C. The anodic alumina layer was prepared by two-step anodizing process in oxalic acid at 40 V. The ordered arrays of nanopore on anodic alumina were shown to be strongly dependent on the annealing conditions, and nanopore regularity on alumina template increased with increasing annealing temperature and time.

ChemInform Abstract: Self-Organized Formation of Hexagonal Pore Structures in Anodic Alumina.

ChemInform ◽  
2010 ◽  
Vol 30 (3) ◽  
pp. no-no
Author(s):  
O. JESSENSKY ◽  
F. MUELLER ◽  
U. GOESELE
Keyword(s):  
Anodic Alumina ◽  
Self Organized ◽  
Pore Structures
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