Superhydrophilicity of a nanofiber-covered aluminum surface fabricated via pyrophosphoric acid anodizing

Nakajima, Daiki; Kikuchi, Tatsuya; Natsui, Shungo; Suzuki, Ryosuke O.

doi:10.1016/j.apsusc.2016.06.088

Cited by 27 publications

(15 citation statements)

References 48 publications

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“…The contact angle of the droplet formed on the rough surface can be described by Wenzel’s equation as [56] cos θ W = R cos θ where R corresponds to the specific surface area, and θ W and θ are the contact angles obtained on the rough surface and the flat surface, respectively. The anodic alumina nanofibers formed by pyrophosphoric acid anodizing consists of pure aluminum oxide without any electrolyte anion, and anodic aluminum oxide exhibits hydrophilicity due to the presence of the surface-bound hydroxyl groups [51]. Therefore, Wenzel’s equation indicates that the contact angle decreases with increasing specific surface area on such a hydrophilic surface.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the fabrication of highly slippery and sticky superhydrophobic aluminum surfaces is easily achieved via the nanostructure control of alumina nanofibers [50]. On the other hand, the nanofiber-covered aluminum surface without SAM modification exhibits superhydrophilic behavior [51,52,53]. The contact angle measured on the superhydrophilic aluminum surface greatly changed with the anodizing time.…”

Section: Introductionmentioning

confidence: 99%

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A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

et al. 2019

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A superhydrophilic aluminum surface with fast water evaporation based on nanostructured aluminum oxide was fabricated via anodizing in pyrophosphoric acid. Anodizing aluminum in pyrophosphoric acid caused the successive formation of a barrier oxide film, a porous oxide film, pyramidal bundle structures with alumina nanofibers, and completely bent nanofibers. During the water contact angle measurements at 1 s after the water droplet was placed on the anodized surface, the contact angle rapidly decreased to less than 10°, and superhydrophilic behavior with the lowest contact angle measuring 2.0° was exhibited on the surface covered with the pyramidal bundle structures. As the measurement time of the contact angle decreased to 200–33 ms after the water placement, although the contact angle slightly increased in the initial stage due to the formation of porous alumina, at 33 ms after the water placement, the contact angle was 9.8°, indicating that superhydrophilicity with fast water evaporation was successfully obtained on the surface covered with the pyramidal bundle structures. We found that the shape of the pyramidal bundle structures was maintained in water without separation by in situ high-speed atomic force microscopy measurements.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

et al. 2019

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“…3− is concentrated in the intermediate part of the outer wall. As an interesting example, anodization in pyropohospohoric acid should be mentioned, which leads to the formation of honeycomb oxide with nanofibers [99,100]. The electron energy loss spectroscopy (EELS) revealed that phosphorus was incorporated into the barrier layer; however, the nanofibers were composed of relatively pure alumina, equivalent to the previously reported "interstitial rods".…”

Section: Mechanism Of Anions Incorporation: Duplex and Triplex Structurementioning

confidence: 88%

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

2021

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Anodic oxidation of metals leads to the formation of ordered nanoporous or nanotubular oxide layers that contribute to numerous existing and emerging applications. However, there are still numerous fundamental aspects of anodizing that have to be well understood and require deeper understanding. Anodization of metals is accompanied by the inevitable phenomenon of anion incorporation, which is discussed in detail in this review. Additionally, the influence of anion incorporation into anodic alumina and its impact on various properties is elaborated. The literature reports on the impact of the incorporated electrolyte anions on photoluminescence, galvanoluminescence and refractive index of anodic alumina are analyzed. Additionally, the influence of the type and amount of the incorporated anions on the chemical properties of anodic alumina, based on the literature data, was also shown to be important. The role of fluoride anions in d-electronic metal anodizing is shown to be important in the formation of nanostructured morphology. Additionally, the impact of incorporated anionic species, such as ruthenites, and their influence on anodic oxides formation, such as titania, reveals how the phenomenon of anion incorporation can be beneficial.

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“…A nanober-covered aluminum surface exhibits superhydrophilic properties with a water contact angle (WCA) of less than 10 observed within 0.1 seconds aer placement of the water drop. 29,30 Rapid drying and snow-sliding behaviors were observed on these aluminum surfaces covered with alumina nanobers. Conversely, the WCA drastically changes to show superhydrophobic behavior and is over 150 when the surface of the alumina nanobers is modied with a self-assembled monolayer (SAM).…”

Section: Introductionmentioning

confidence: 96%

Advancing and receding contact angle investigations for highly sticky and slippery aluminum surfaces fabricated from nanostructured anodic oxide

2018

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Superhydrophilicity of a nanofiber-covered aluminum surface fabricated via pyrophosphoric acid anodizing

Cited by 27 publications

References 48 publications

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

Advancing and receding contact angle investigations for highly sticky and slippery aluminum surfaces fabricated from nanostructured anodic oxide

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