Fabrication of self-ordered nanoporous alumina with 500–750 nm interpore distances using hard anodization in phosphoric/oxalic acid mixtures

Azimi, Hasan Ali Rayat; Zarei, M; Rafati, Amir; Noormohammadi, Mohammad

doi:10.1007/s10934-015-0088-5

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…The micro-cracks on the surface were straight, long (over 1000 μm), and perpendicular in Figure 1a. Due to the stress, cylindrical oxide cells with micro-pores (21-26 nm) spreading vertically down through the thickness of the coating were observed in Figure 1d [22][23][24]. When the cylindrical oxide cells adjoined to each other, they formed a porous layer.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

Shao

Jiang

et al. 2018

Metals

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Two kinds of metal oxide coatings were fabricated on 7050 Al alloy by hard anodization (HA) and micro-arc oxidation (MAO) techniques. The microstructure, phase composition, and corrosion behavior of the two coatings were studied by scanning electron microscopy, X-ray diffraction, and corrosion tests, respectively. When compared with the HA coating, the MAO one was more effective to isolate the substrate from the corrosive environment. In addition, as confirmed by electrochemical tests, the MAO coating was of better corrosion resistance than the HA coating. Furthermore, it was revealed by neutral salt spray test that the MAO coating could protect substrate alloy over 1140 h, while the HA coating can only protect substrate alloy for 46 h due to the amorphous composition and through thickness defects (micro-pores and micro-cracks).

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Section: Resultsmentioning

confidence: 99%

A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

Shao

Jiang

et al. 2018

Metals

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“…It was also demonstrated that addition of ethanol to the oxalic electrolyte under HA (1:4 ethanolto-water volumetric mixture) resulted in a larger D c and slightly lower degree of pore ordering as compared to that produced in a pure water-based electrolyte. 102 Various phosphoric/oxalic mixtures was used by Azimi et al 103 to conduct HA of aluminium in the voltage range of 230-360 V. The obtained D c varied between 500 and 750 nm, however, pores in the PAAs were rather irregular. The HA in a phosphoric/oxalic mixture was also studied by Mohammadniaei.…”

Section: Experimental Strategiesmentioning

confidence: 99%

Self-Ordered Porous Anodic Alumina with Large Pore Intervals: Review on Experimental and Theoretical Research

Norek¹

2022

J. Electrochem. Soc.

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The production of self-organized porous anodic alumina (PAA) with large intepore intervals (Dc > 380 nm) is still under development. The PAA is very interesting for applications in optics and photonics where a large-scale periodicity corresponding to visible or infrared light is required. However, the process remains challenging because it usually involves anodization under high voltages that is prone to instabilities and breakdown events. The basic problem relies on harnessing the electrochemical conditions to find a balance between various phenomena that occur during transformation from aluminum to porous alumina. The overall process is quite complicated but it is believed that regularity of pore formation is governed mainly by an equilibrated counter-ion (Al3+ and electrolyte anions A-) exchange at the electrolyte/oxide interface. Accordingly, a new concept of PAA growth is proposed which takes into account three basic elements of field-enhanced dissolution, plastic flow, and electro-convective models. The results on recent achievements in the high-voltage anodization is discussed focusing on the strategies that led to the self-ordering growth of PAA with large Dc. It is hoped that the review will contribute to better designing of anodization parameters to produce the ordered porous material with desired morphology.

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“…An AAO substrate was fabricated using the two-step anodization method. , The anodization condition was adjusted according to the particle size of SNs. A high purity aluminum plate of 1 mm in thickness was cut into rectangular specimens of 10 × 50 mm in size.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…As a novel technique for fabrication of ordered NCP-SNMA, an anodic aluminum oxide (AAO) substrate has received much attention as a nanotemplate. It is well known that the arrangement of AAO-nanosized pores can be controlled by electrochemical anodization conditions. − For that reason, the AAO substrate is one of the famous nanotemplates to prepare multifunctional nanomaterials such as nanoparticle arrays , and nanometal pillar arrays for various applications. Wang and co-workers reported the fabrication of NCP silver nanoparticle monolayer arrays on an organized AAO substrate by an electrochemical synthesis for surface-enhanced Raman scattering (SERS) .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Silica Nanoparticle Monolayer Arrays Using an Anodic Aluminum Oxide Template

et al. 2019

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Non-close-packed (NCP) silica nanoparticle monolayer arrays (SNMA) on ordered porous anodic aluminum oxide (AAO) templates were fabricated for the first time by a novel two-step spin-coating technique. The obtained NCP-SNMA-AAO was composed of silica nanoparticles (average primary particle size of 440 nm) and well-organized nanopores on the AAO substrates. NCP-SNMA-AAO with a supporting ratio of 87% silica nanoparticles showed a hydrophilic surface (water contact angle of 51.0°), while the original AAO substrate shows a hydrophobic surface (water contact angle of 107.9°). The maximum coefficient of static friction was decreased by 29% (0.327 → 0.233). The coefficient of dynamic friction was also decreased by 20% (0.281 → 0.226). We found that controlling the silica supporting ratio using the two-step spin-coating technique is an effective approach for surface modification of an AAO substrate.

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Fabrication of self-ordered nanoporous alumina with 500–750 nm interpore distances using hard anodization in phosphoric/oxalic acid mixtures

Cited by 8 publications

References 22 publications

A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

Self-Ordered Porous Anodic Alumina with Large Pore Intervals: Review on Experimental and Theoretical Research

Fabrication of Silica Nanoparticle Monolayer Arrays Using an Anodic Aluminum Oxide Template

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