Formation of unidirectional nanoporous structures in thickly anodized aluminum oxide layer

Na, Hyun-Chae; Sung, T.J.; Yoon, Seung Hwan; Hyun, Seung-Kyoun; Kim, Mok‐Soon; Lee, Young-Gi; Shin, Sang-Hyun; Choi, S.C.; Yi, Seong‐Tae

doi:10.1016/s1003-6326(08)60398-2

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…In this study, the anodization process was developed by following Na et al's, 2009 anodization procedures (see Fig. 6(a)), where a sulfuric electrolyte solution composed of 20% Sulfuric Acid and 80% distilled water by weight was placed inside the test beaker followed by the two lead cathodes.…”

Section: Sample Preparationsmentioning

confidence: 99%

Opening-mode fractures of a brittle coating bonded to an elasto-plastic substrate

Chen

Prieto-Muñoz

et al. 2015

International Journal of Plasticity

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Section: Sample Preparationsmentioning

confidence: 99%

Opening-mode fractures of a brittle coating bonded to an elasto-plastic substrate

Chen

Prieto-Muñoz

et al. 2015

International Journal of Plasticity

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“…However, near ambient temperatures (equal to or greater than 20 • C) significantly shorten the anodization time, allowing the synthesis of thick membranes in a short time, without the need for a cooling circuit [3]. Another way to minimize AAO film synthesis costs is to use commercial aluminum alloys such as AA 1050 (99.5% Al) [1,[16][17][18][19] as the substrate, although high-purity aluminum anodizing allows obtaining higher order films [11,15,20,21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Morphological Characterization of Nanoporous Aluminum Oxide Films by Using a Single Anodization Step

et al. 2019

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Nanoporous anodic aluminum oxide (AAO) films play an important role in nanotechnology due to their easily adjustable morphological properties and wide range of applications. Thus, a deep and systematic characterization of the morphological properties of these coatings is essential. The most important variables in the synthesis of nanoporous AAO films include the anodization voltage, nature, concentration and temperature of the electrolyte, which, combined, result in pores of different sizes and geometries. In the present work, AA 1050 alloy was used to synthesize AAO films, using 0.3 and 0.9 M oxalic acid as the electrolyte and combining different electrolyte temperatures (20, 30 and 40 °C) and anodizing voltages (30, 40 and 60 V), with the aim to correlate the morphological properties of the coatings with the synthesis parameters of a single anodization step. The coatings obtained were characterized by optical microscopy and scanning electron microscopy, determining pore diameter, interpore distance, pore density and coating thickness. The results showed that, by varying the anodic synthesis conditions, it is possible to obtain coatings with a pore diameter between 21 and 97 nm, an interpore distance between 59 and 138 nm, pore density between 2.8 × 1010 and 5.4 × 109 pores/cm2 and thicknesses between 15 and 145 µm. In this way, the right combination of synthesis variables allows synthesizing AAO coatings with morphological characteristics best suited to each particular application.

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“…Moreover, the fraction of cracks increases significantly with anodizing time and electrolyte temperature. The crack-free oxide layers were obtained at the anodizing time of 2 h, irrespective of electrolyte temperature [46].…”

Section: Formation Of Defects and Cracks In The Oxide Structurementioning

confidence: 97%

“…On the other hand, too long exposition of the sample to the aggressive environment could result in damage of the aluminum substrate. [44][45][46] were applied for the fabrication of nanoporous alumina layers on the surface of low-purity Al substrates. A typical voltage versus time curve recorded during anodization under a constant current regime is shown in Fig.…”

Section: Al Substrate Pre-treatmentmentioning

confidence: 99%

“…The effect of intermetallic compound presence on the barrier layer side is clearly visible. Reprinted with permission from [44] diluted sulfuric acid electrolyte under the constant current density of 3 A dm −2 at different temperatures [46]. The AAO layers with a thickness of 105-284 µm were successfully obtained, however, when the anodizing time was longer than 4 h, a lot of cracks were observed in the cross sectional images.…”

Section: Formation Of Defects and Cracks In The Oxide Structurementioning

confidence: 99%

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Synthesis of Nanoporous Anodic Alumina by Anodic Oxidation of Low Purity Aluminum Substrates

et al. 2015

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The aim of this chapter is to present some recent findings on the fabrication of anodic aluminum oxide (AAO) layers by anodization of low purity aluminum substrates. The use of low purity, technical aluminum alloys, instead of high purity substrates, can significantly reduce the cost of AAO fabrication, however, this can also affect the structure and properties of as produced alumina layers. Here, we focused on the comparison of oxide layer growth on substrates with different Al contents, as well as on the new procedures used for the synthesis of well-ordered nanoporous oxides from technical aluminum alloys. Some applications of the formed nanoporous AAO layers are presented. IntroductionDuring the recent years nanomaterials have received significant attention due to many unique chemical and physical properties that make them promising materials for various modern applications. As a result, nanotechnology is now one of the most popular sciences which have opened a lot of new perspectives in almost all scientific disciplines [1]. Up to now, the main problem that limits the practical application of nanomaterials is a relatively high cost of nanofabrication [2]. That is why considerable research efforts focus on the design and control of novel nanostructures via innovative synthetic strategies. A big attention has been paid to development a simple and inexpensive method of nanofabrication that can be used not only in a laboratory scale but also could have some potential for a commercial-scale implementation. Among numerous strategies reported in the literature, one of the most popular method for fabricating nanostructured oxide layers on the metal surface is controlled anodic oxidation (anodization) of metals under

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Formation of unidirectional nanoporous structures in thickly anodized aluminum oxide layer

Cited by 14 publications

References 11 publications

Opening-mode fractures of a brittle coating bonded to an elasto-plastic substrate

Opening-mode fractures of a brittle coating bonded to an elasto-plastic substrate

Synthesis and Morphological Characterization of Nanoporous Aluminum Oxide Films by Using a Single Anodization Step

Synthesis of Nanoporous Anodic Alumina by Anodic Oxidation of Low Purity Aluminum Substrates

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