Formulation of a criterion predicting the development of uniform regular and non-uniform abnormal porous anodic alumina coatings and revealing the mechanisms of their appearance and progress

Patermarakis, G.; Moussoutzanis, K.

doi:10.1016/s0010-938x(00)00161-x

Cited by 26 publications

(33 citation statements)

References 29 publications

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“…Patermarakis et al [271][272][273][364][365][366][367][368][369][370][371][372][373][374][375][376][377][378] described, in several publications, a compact theoretical model of porous alumina growth in various electrolytes. Different approaches have been employed to obtain information about the kinetics and mechanism of the oxide growth mainly in sulfate solutions.…”

Section: Growth Models Proposed By Patermarakis and Colleaguesmentioning

confidence: 99%

“…The model showed that the sulfuric acid concentration can increase, decrease or reach a local minimum when the analysis of concentration is performed along the pore depth in the direction from the top of the film to the pore bottoms [369]. The transport analysis criterion, which allows prediction of the conditions of regular and abnormal oxide growth, was also performed [370,371]. The most important parameter influencing abnormal oxide growth is electrolyte concentration at the pore base in relation to the current density [370].…”

Section: Growth Models Proposed By Patermarakis and Colleaguesmentioning

confidence: 99%

“…The transport analysis criterion, which allows prediction of the conditions of regular and abnormal oxide growth, was also performed [370,371]. The most important parameter influencing abnormal oxide growth is electrolyte concentration at the pore base in relation to the current density [370]. The promotion of pitting occurs at low temperature and sulfuric acid concentration or high current density and sulfate additives including Al 2 (SO 4 ) 3 [371,372].…”

Section: Growth Models Proposed By Patermarakis and Colleaguesmentioning

confidence: 99%

See 2 more Smart Citations

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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Section: Growth Models Proposed By Patermarakis and Colleaguesmentioning

confidence: 99%

Section: Growth Models Proposed By Patermarakis and Colleaguesmentioning

confidence: 99%

Section: Growth Models Proposed By Patermarakis and Colleaguesmentioning

confidence: 99%

See 1 more Smart Citation

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Sulka

2008

Nanostructured Materials in Electrochemistry

236

298

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“…Several studies have shown that anodization processes carried out at room and higher temperatures dramatically decrease the oxide formation current efficiency, leading to severe aluminum dissolution [3,17,18]. Therefore, in this study we decided to carry out the process just above the freezing point of the electrolyte.…”

Section: Anodic Oxidationmentioning

confidence: 99%

Optimization of anodic oxidation and Cu–Cr oxide catalyst preparation on structured aluminum plates processed by electro discharge machining

et al. 2005

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“…[15][16][17] Fabrication of organized molecular assembly (selfassembled monolayer, SAM) on a micro-or nano-scale structured surface with a low free energy material is an effective approach for obtaining a hydrophobic or a superhydrophobic surface. One technical detail that should be considered in the coating of a SAM on nanoporous surface is the dehydration of nanopores.…”

mentioning

confidence: 99%

Fabrication of Superhydrophobic Surface of Alumina with Nanoporous Structure

Lee¹,

Park²,

Lee³

2010

Bulletin of the Korean Chemical Society

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, the bottom area of , the top area of , and the bottom area of .Controlling the wetting property of a surface to be superhydrophobic has been an attractive subject in science and technology.1-4 Self-cleanable superhydrophobic surfaces promise not only the self-removal of undesired contaminants from the surfaces of high-end products, but also a decrease in the surface energy of the mother molds for the easy departure of a replica pattern in template base lithography.Anodized aluminum oxide (AAO) is a well-defined nanoporous template to produce ordered pillar patterns 5-7 or rod-type nanostructures, [8][9][10][11][12][13][14] because the pore size, depth and ordering regime of the resulting pattern can be tuned in the nanometer scale.15-17 Fabrication of organized molecular assembly (selfassembled monolayer, SAM) on a micro-or nano-scale structured surface with a low free energy material is an effective approach for obtaining a hydrophobic or a superhydrophobic surface. One technical detail that should be considered in the coating of a SAM on nanoporous surface is the dehydration of nanopores. Because the AAOs are obtained from acidic aqueous solutions and the pore-depth to diameter aspect ratio strongly affects the hysteresis in the permeability and capillary pressure, 18 dehydration of the water-filled nanopores is crucial for fabricating a well-defined SAM in the pores. This paper suggests an effective process for fabricating a heptadecafluoro-1,1,2,2-tetrahydrodecyl-trichlorosilane (HDFS) monolayer to reduce the surface energy of porous AAO focusing on its superhydrophobicity and its use as a nanoimprinting template. An ultrapure aluminum plate (Goodfellow, UK) was laser cut into 2 × 5 cm 2 pieces. A well-ordered oxalic AAO (OAAO) mold was fabricated by two-step anodizing in an oxalic acid solution (0.3 M) at 40 V followed by post-etching for 25 min. The phosphoric AAO (PAAO) mold also was obtained with phosphoric acid (0.1 M) at 193 V. Dehydration of the AAOs was carried out in two different ways. One was 'simple drying' with a gentle stream of N2 gas (OAAO-sd and PAAO-sd), and the other was the more effective 'MeOH-exchange dehydration' (OAAO-md and PAAO-md) with soaking in methanol for more than 1 hour followed by drying in a vacuum desiccator. The plates were then soaked into a 1 mM solution of HSFS (Gelest Inc., Penn.) in n-hexane for 1 hour.The cross-section FE-SEM image of OAAO in Figure 1 (a) shows well-ordered straight nanometer-scale holes (several tens nanometer of the diameter) with a micrometer-scale depth a These authors contributed equally.(3.32 µm). The fabrication of a self-assembled HDFS monolayer on the surface with the two different dehydrations was investigated using wavelength dispersed spectroscopy (WDS) and contact angle (CA) measurements. The WDS of the OAAOs were obtained by JXA-8500F electron probe micro analyzer (EPMA, Jeol, Japan). The silicon peak, which is due to the HDFS molecular layer, was detected with discrete peaks at both the lower and upper regions of the grown oxide in...

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Formulation of a criterion predicting the development of uniform regular and non-uniform abnormal porous anodic alumina coatings and revealing the mechanisms of their appearance and progress

Cited by 26 publications

References 29 publications

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Highly Ordered Anodic Porous Alumina Formation by Self‐Organized Anodizing

Optimization of anodic oxidation and Cu–Cr oxide catalyst preparation on structured aluminum plates processed by electro discharge machining

Fabrication of Superhydrophobic Surface of Alumina with Nanoporous Structure

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