ON THE CAPACITY OF POROUS ALUMINUM OXIDE LAYERS

1950 ◽  
Vol 28b (9) ◽  
pp. 541-550 ◽  
Author(s):  
A. J. Dekker ◽  
Helen M. A. Urquhart
Keyword(s):  
Aluminum Oxide ◽  
Current Density ◽  
Barrier Layer ◽  
Critical Value ◽  
Final Thickness ◽  
Oxide Layers ◽  
Porous Aluminum ◽  
Electronic Current ◽  
Density Concentration ◽  
Porous Aluminum Oxide

Porous aluminum oxide layers may be obtained by anodic oxidation in sulphuric acid. The base of the pores is separated from the metal by a thin insulating barrier layer. The experiments show that the ultimate thickness of the barrier layer remains constant after a critical value has been reached. The dependence of the final thickness on current density, concentration, and temperature has been investigated. It is suggested that an electronic current is involved in the mechanism which limits the growth of the barrier layer.

Preparation of cobalt nanowires in porous aluminum oxide: Study of the effect of barrier layer

2012 ◽  
Vol 27 (18) ◽  
pp. 2382-2390 ◽  
Author(s):  
Mojgan Najafi ◽  
Saeid Soltanian ◽  
Habibollah Danyali ◽  
Rahman Hallaj ◽  
Abdollah Salimi ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Barrier Layer ◽  
Porous Aluminum ◽  
Cobalt Nanowires ◽  
Porous Aluminum Oxide ◽  
Image Position

Abstract

scholarly journals Peculiar Porous Aluminum Oxide Films Produced viaElectrochemical Anodizing in Malonic Acid Solution withArsenazo-I Additive

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5118
Author(s):  
Alexander Poznyak ◽  
Gerhard Knörnschild ◽  
Anatoly Karoza ◽  
Małgorzata Norek ◽  
Andrei Pligovka
Keyword(s):  
Oxide Film ◽  
Aluminum Oxide ◽  
Malonic Acid ◽  
Current Density ◽  
Pure Aluminum ◽  
Film Structure ◽  
Hydroxyl Groups ◽  
Porous Aluminum ◽  
Aluminum Oxide Film ◽  
Porous Aluminum Oxide

The influence of arsenazo-I additive on electrochemical anodizing of pure aluminum foil in malonic acid was studied. Aluminum dissolution increased with increasing arsenazo-I concentration. The addition of arsenazo-I also led to an increase in the volume expansion factor up to 2.3 due to the incorporation of organic compounds and an increased number of hydroxyl groups in the porous aluminum oxide film. At a current density of 15 mA·cm–2 and an arsenazo-I concentration 3.5 g·L–1, the carbon content in the anodic alumina of 49 at. % was achieved. An increase in the current density and concentration of arsenazo-I caused the formation of an arsenic-containing compound with the formula Na1,5Al2(OH)4,5(AsO4)3·7H2O in the porous aluminum oxide film phase. These film modifications cause a higher number of defects and, thus, increase the ionic conductivity, leading to a reduced electric field in galvanostatic anodizing tests. A self-adjusting growth mechanism, which leads to a higher degree of self-ordering in the arsenazo-free electrolyte, is not operative under the same conditions when arsenazo-I is added. Instead, a dielectric breakdown mechanism was observed, which caused the disordered porous aluminum oxide film structure.

Structure of triglycine sulfate embedded in porous aluminum oxide

2012 ◽  
Vol 54 (11) ◽  
pp. 2296-2300 ◽  
Author(s):  
O. M. Golitsyna ◽  
S. N. Drozhdin ◽  
I. E. Zanin ◽  
A. E. Gridnev
Keyword(s):  
Aluminum Oxide ◽  
Triglycine Sulfate ◽  
Porous Aluminum ◽  
Porous Aluminum Oxide

AC Electrodeposition of Uniform High Aspect-Ratio Metal Nanowires in Porous Aluminum Oxide Templates

2005 ◽  
Vol 879 ◽  
Author(s):  
Nathan J. Gerein ◽  
Shazma S. Mithani ◽  
Joel A. Haber
Keyword(s):  
Aluminum Oxide ◽  
Continuous Wave ◽  
Cost Effective ◽  
Fractional Factorial ◽  
Metal Nanowires ◽  
Porous Aluminum ◽  
Multiple Variables ◽  
Porous Aluminum Oxide ◽  
Iron Nanowires ◽  
The Impact

AbstractThe use of alternating current (ac) electrodeposition permits deposition through the resistive Al2O3 barrier layer, enabling the use of the as-grown porous aluminum oxide (PAO) template. This results in a process that is cost effective, simple, and scalable. However, achieving uniform filling using this technique is challenging. We have carried out a systematic study of the effect of multiple variables on the ac electrodeposition of copper nanowires using a fractional factorial design of experiment (FFDOE). This experiment led to the identification of template damage that occurs when continuous wave ac deposition conditions are employed, as well as to effective pulsed wave ac electrodeposition conditions. Subsequent examination of the effect of wave shape has identified the impact of this variable on electrodeposition, producing a further optimized set of ac electrodeposition conditions. The utility of these electrodeposition conditions has also been extended to the deposition of iron nanowires with similar results.

scholarly journals Measurements of porous aluminum oxide thermal properties

2020 ◽  
Vol 1560 ◽  
pp. 012055
Author(s):  
A D Kurilov ◽  
V V Belyaev ◽  
E E Alyasova ◽  
A V Osin ◽  
O A Tokareva ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Aluminum Oxide ◽  
Porous Aluminum ◽  
Porous Aluminum Oxide

Photochromism of Diarylethenes on Porous Aluminum Oxide: Fatigue Resistance and Redox Potentials of the Photochromes

2001 ◽  
Vol 30 (4) ◽  
pp. 366-367 ◽  
Author(s):  
Kingo Uchida ◽  
Masayuki Fujita ◽  
Yoshifumi Aoi ◽  
Mitsunori Saito ◽  
Masahiro Irie
Keyword(s):  
Aluminum Oxide ◽  
Fatigue Resistance ◽  
Redox Potentials ◽  
Porous Aluminum ◽  
Porous Aluminum Oxide
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