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Influence of sub-10 nm anodic alumina nanowire morphology formed by two-step anodizing aluminum on water wettability and slipping behavior

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Title: Influence of sub-10 nm anodic alumina nanowire morphology formed by two-step anodizing aluminum on water wettability and slipping behavior
Authors: Kikuchi, Tatsuya Browse this author →KAKEN DB
Onoda, Fumiya Browse this author
Iwai, Mana Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Keywords: Anodizing
Aluminum nanobowls
Alumina nanowires
Contact angle
Issue Date: 30-Apr-2021
Publisher: Elsevier
Journal Title: Applied surface science
Volume: 546
Start Page: 149090
Publisher DOI: 10.1016/j.apsusc.2021.149090
Abstract: The influence of the nanomorphology of alumina nanowires (ANWs) fabricated by a two-step anodizing process on the superhydrophobicity was investigated through advancing contact angle (ACA) and receding contact angle (RCA) measurements. Aluminum nanobowl specimens were anodized in pyrophosphoric acid to fabricate an ordered ANW structure with an average diameter of 7.1 nm, and the outermost surface of the ANWs was chemically bonded with fluorinated self-assembled monolayers. The growing ANWs bent immediately their own weight, and pyramidal ANW structures were formed as they joined the surrounding nanowires together. The ACA value increased with the number density of pyramidal ANW structures due to the reducing area fraction of ANWs, and an increased superhydrophobicity with a contact angle of approximately 165. was measured on the low-density pyramidal structure with a density of 8.1 x 10(11) m(-2). Additional anodizing led to complete nanowire bending; thus, the advancing contact angle decreased. The pyramidal nanowire structure exhibited a large slipping property with a contact angle hysteresis (CAH) < 10 degrees, whereas the bent nanowire structure exhibited a decreased slipping property with a CAH > 100 degrees. Superhydrophobic surfaces with opposite water slipping properties were demonstrated by a water dropping experiment.
Rights: © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 菊地 竜也

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