High-speed galvanostatic anodizing without oxide burning using a nanodimpled aluminum surface for nanoporous alumina fabrication

Iwai, Mana; Kikuchi, Tatsuya; Suzuki, Ryosuke O.

doi:10.1016/j.apsusc.2020.147852

Cited by 15 publications

(6 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all scenarios, the voltage peaked before settling at a steady-state level, consistent with previously reported trends. 3,27,28 When utilizing 0.1 mol•dm −3 phosphoric acid, the voltage reached approximately 163 V after 30 min of anodization. In electrolytes comprising 0.1 mol dm −3 phosphoric acid with 10, 20, and 50 vol% glycerol, the final voltages after 30 min were approximately 160, 163, and 169 V, respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Asoh,

Ota,

Hagiwara

2024

J. Electrochem. Soc.

View full text Add to dashboard Cite

Aluminum was anodized in a phosphoric acid solution containing glycerol. Anodization in high concentration and high temperature electrolytes typically faces challenges due to the chemical dissolution of the anodic film. However, we found that the maximum attainable film thickness could be doubled by incorporating glycerol into the electrolyte. This enhancement was more effective under conditions of high concentration and temperature than in environments with lower concentrations and temperatures.

show abstract

Section: Resultsmentioning

confidence: 99%

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Asoh,

Ota,

Hagiwara

2024

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The changes in the nanomorphology of porous AAO structures under various anodizing conditions in alkaline sodium tetraborate solution were investigated via electrochemical measurements, scanning electron microscopy (SEM), and image analysis. The conventional anodizing method using acidic solutions for the formation of ordered porous AAO structures is frequently carried out at low temperatures to remove the generated Joule heat and induce the rapid growth of anodic oxides without “burning” 23 – 25 . However, extremely low current densities measuring approximately 20 Am −2 were encountered when the electropolished Al was potentiostatically anodized in a 0.5 M sodium tetraborate solution at less than 335 K (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A major advantage of anodizing in sodium tetraborate is that a stable anodizing process at higher applied voltages (more than 100 V) can be achieved without the occurrence of oxide burning on complicated three-dimensional Al substrates for the formation of self-ordered porous AAO structures. During the typical anodizing process in acidic solutions such as phosphoric and etidronic acids to form ordered porous AAOs, the self-ordering process occurs under the highest current density condition at a maximum applied voltage, which is just below the burning voltage 13 , 25 . Therefore, the electrolyte solution should be vigorously stirred during the anodizing process to remove the Joule heat from the Al anode and avoid burning.…”

Section: Resultsmentioning

confidence: 99%

Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media

Iwai

Kikuchi

Suzuki

2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

High-aspect ratio ordered nanomaterial arrays exhibit several unique physicochemical and optical properties. Porous anodic aluminum oxide (AAO) is one of the most typical ordered porous structures and can be easily fabricated by applying an electrochemical anodizing process to Al. However, the dimensional and structural controllability of conventional porous AAOs is limited to a narrow range because there are only a few electrolytes that work in this process. Here, we provide a novel anodizing method using an alkaline electrolyte, sodium tetraborate (Na2B4O7), for the fabrication of a high-aspect ratio, self-ordered nanospike porous AAO structure. This self-ordered porous AAO structure possesses a wide range of the interpore distance under a new anodizing regime, and highly ordered porous AAO structures can be fabricated using pre-nanotexturing of Al. The vertical pore walls of porous AAOs have unique nanospikes measuring several tens of nanometers in periodicity, and we demonstrate that AAO can be used as a template for the fabrication of nanomaterials with a large surface area. We also reveal that stable anodizing without the occurrence of oxide burning and the subsequent formation of uniform self-ordered AAO structures can be achieved on complicated three-dimensional substrates.

show abstract

“…The technique is usually referred to as anodic oxidation or anodisation. Probably the best-known technique is anodisation of titanium, used for the formation of nanotubular or nanoporous films [ 18 , 21 ] and anodisation of aluminium, which is used for the formation of a thin oxide film [ 22 , 23 , 24 ], which prevents any further degradation of the material.…”

Section: Literature Surveymentioning

confidence: 99%

Nanoporous Stainless Steel Materials for Body Implants—Review of Synthesizing Procedures

et al. 2022

View full text Add to dashboard Cite

Despite the inadequate biocompatibility, medical-grade stainless steel materials have been used as body implants for decades. The desired biological response of surfaces to specific applications in the body is a highly challenging task, and usually not all the requirements of a biomaterial can be achieved. In recent years, nanostructured surfaces have shown intriguing results as cell selectivity can be achieved by specific surface nanofeatures. Nanoporous structures can be fabricated by anodic oxidation, which has been widely studied for titanium and its alloys, while no systematic studies are so far available for stainless steel (SS) materials. This paper reviews the current state of the art in the anodisation of SS; correlations between the parameters of anodic oxidation and the surface morphology are drawn. The results reported by various authors are scattered because of a variety of experimental configurations. A linear correlation between the pores’ diameter anodisation voltage was deduced, while no correlation with other processing parameters was found obvious. The analyses of available data indicated a lack of systematic experiments, which are recommended to understand the kinetics of pore formation and develop techniques for optimal biocompatibility of stainless steel.

show abstract

High-speed galvanostatic anodizing without oxide burning using a nanodimpled aluminum surface for nanoporous alumina fabrication

Cited by 15 publications

References 49 publications

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Communication—Anodization of Aluminum in Phosphoric Acid Containing Glycerol at 30 °C

Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media

Nanoporous Stainless Steel Materials for Body Implants—Review of Synthesizing Procedures

Contact Info

Product

Resources

About