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 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.
Lee
Wonbae
W
Department of Biomedical Engineering, College of Health Science, Korea University San 1, Jeongneung-3-dong, Seongbuk-gu, Seoul 136-703, Korea.
Park
Bo Gi
BG
Kim
Dae Hyun
DH
Ahn
Dong Jun
DJ
Park
Yongdoo
Y
Lee
Sang Hoon
SH
Lee
Kyu Back
KB
D000268:Adhesiveness; D000537:Aluminum Oxide / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D016062:Porosity; D014867:Water / Q000737:chemistry*
D014867:Water; D000537:Aluminum Oxide