Nanostructure-Dependent Water-Droplet Adhesiveness Change in Superhydrophobic Anodic Aluminum Oxide Surfaces: From Highly Adhesive to Self-Cleanable

Water-droplet adhesiveness was freely controlled on a single platform of superhydrophobic anodized aluminum oxide (AAO) within the range from highly adhesive to self-cleanable. Changing the structure from nanopore to nanopillar arrays at the surface caused a dramatic increase in the receding angle a...

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Bibliographic Details
Published in:Langmuir 2010-02, Vol.26 (3), p.1412-1415
Main Authors: Lee, Wonbae, Park, Bo Gi, Kim, Dae Hyun, Ahn, Dong Jun, Park, Yongdoo, Lee, Sang Hoon, Lee, Kyu Back
Format: Article
Language:English
Subjects:
Adhesiveness
Aluminum Oxide - chemistry
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Hydrophobic and Hydrophilic Interactions
Microscopy, Electron, Scanning
Nanostructures - chemistry
Porosity
Porous materials
Surface physical chemistry
Water - chemistry
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Summary:Water-droplet adhesiveness was freely controlled on a single platform of superhydrophobic anodized aluminum oxide (AAO) within the range from highly adhesive to self-cleanable. Changing the structure from nanopore to nanopillar arrays at the surface caused a dramatic increase in the receding angle and a decrease in the hysteresis of water contact angles. The presence of dead-end nanopores but not through nanoholes was recognized as one of the main causes of the adhesiveness of superhydrophobic surfaces. The adhesiveness-controllable superhydrophobic AAO can be an excellent platform on which to elucidate the physical nature of the wetting phenomenon related to the nanostructure and has promising potential in technological applications.
ISSN:0743-7463
1520-5827
DOI:10.1021/la904095x