Relationship between Pore Diameter to Cell Diameter Ratio and Self-Ordering of Anodic Porous Alumina

Ono, Satoshi; Asoh, Hidetaka; Saito, M.; Ishiguro, Miyuki

doi:10.5796/electrochemistry.71.105

Cited by 12 publications

(2 citation statements)

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“…This trend shows that between the surface and internal areas of the film, the number of pores per unit area, i.e., pore density, was different, where the density decreased inside the film. The porosity of a porous alumina film prepared under the self-ordering condition, where pores are arranged regularly over a long distance, was approximately 10%, 21,22) indicating that the ratio of the pore diameter to interpore distance is approximately 1/3. However, the pore diameter/interpore distance ratio of sample b prepared in the H 3 PO 4 electrolyte solution at 60 V was 0.63, where the porosity was estimated to be approximately 40%.…”

Section: Dependence Of Pore Density (Interpore Distance)mentioning

confidence: 99%

Effects of Nanoporous Structure of Anodic Films on Adhesive Strength between Aluminum Alloys and Polyamide Resin

2021

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Section: Dependence Of Pore Density (Interpore Distance)mentioning

confidence: 99%

Effects of Nanoporous Structure of Anodic Films on Adhesive Strength between Aluminum Alloys and Polyamide Resin

2021

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“…They are also easy to produce in the laboratory and have a low processing cost. The diameter and density of pores in the alumina films can be controlled by the appropriate choice of temperature and concentration of electrolyte solution (such as sulfuric acid, phosphoric acid, and oxalic acid) and applied voltage between the aluminum substrate and a cathode. , Similarly, the length of the nanopores can be easily controlled with anodizing time. , …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nonlinear Nanopores in Alumina Films

et al. 2007

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Controlled and convenient synthetic approaches for more complex-shaped nanotubes and nanowires of different materials are needed to further advance the field of nanoscience and nanotechnology. In this paper, we report the synthesis and characterization of nonlinear nanopores (such as curved and dendritic nanopores) containing alumina films. We show that control over the orientation of nanopores can be accomplished by controlling the geometric shape of aluminum substrates on which nanoporous alumina is grown. The anodically grown alumina on square and rectangular aluminum substrates showed cracks at the sharp edges of the substrates but no cracks were observed in nanoporous alumina films grown on cylindrical substrates. Our electrostatic calculations suggest that the electric field intensity at sharp edges of the rectangular/square substrates is significantly larger than that at the flat faces of the substrates. This leads to a faster alumina growth rate and hence increased stresses at these edges. We also propose a simple model that predicts the shape and orientation of nonlinear nanopores grown on different geometric shaped substrates. Through the use of proposed nanoporous films as template, one can easily synthesize highly complex-shaped nanotubes and nanowires of different materials.

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