Nanostructuring of surfaces using anodic alumina masks ― methods, materials and properties

摘要

Nanostructured surfaces gain more and more interest due to their significant change in properties caused by those nanoscale features in the surface. Processes to nanostructure surfaces are very often highly sophisticated. By using nanoporous alumina one can easily structure surfaces in the range of 20 nm to 400 nm. The features created are little pillars in the size of the pore separated by again a pore diameter spacing. Since there is no order the stochastic nanostructures exhibit very distinct properties with respect to wettability and reflectivity. When using low energetic surfaces like PTFE the wetting can drastically be changed by changing the feature size of the surface structure. Thus contact angles against water of more than 150°can be achieved. On the other hand a drop of water moves almost freely on those surfaces given rise for easy-to-clean properties. When structuring transparent polymeric samples, the legit reflection is decreased by 5 to 8 % which is new a method to produce anti-reflective shielding for automotive or even solar energy applications.