1. Nanostructure-Dependent Water-Droplet Adhesiveness Change in Superhydrophobic Anodic Aluminum Oxide Surfaces: From Highly Adhesive to Self-Cleanable
- Author
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Dae Hyun Kim, Sang Hoon Lee, Dong Jun Ahn, Wonbae Lee, Yongdoo Park, Kyu Back Lee, and Bo Gi Park
- Subjects
Materials science ,Nanostructure ,Anodizing ,Oxide ,Adhesiveness ,Water ,Nanotechnology ,Surfaces and Interfaces ,Condensed Matter Physics ,Nanostructures ,Contact angle ,Nanopore ,chemistry.chemical_compound ,chemistry ,Aluminum Oxide ,Microscopy, Electron, Scanning ,Electrochemistry ,General Materials Science ,Wetting ,Adhesive ,Hydrophobic and Hydrophilic Interactions ,Porosity ,Spectroscopy ,Nanopillar - Abstract
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.
- Published
- 2009
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