A mould for flat cavity inserts was designed and fabricated by Maier. Several inserts have been laser structured by Lightmotif and used for injection moulding of test plaques. In the first experiments various structures have been applied to the insert. The injection moulding of the micro-nano structures was optimized by Maier and Gaiker-IK4. Analysis by SEM and confocal microscopy was performed by the University of Twente to understand the replication behaviour.
The plastic test plaques have been tested for various properties by Gaiker-IK4 and CRF. Most importantly the super water repelling behaviour was studied by contact angle measurements and falling droplets experiments.
Besides applications as self-cleaning surfaces, the structures can also be adapted towards improved haptics: silky soft surfaces are generated by specific microstructures.
The structured surfaces are also highly anti-reflective. This is illustrated in the two pictures at the bottom right. A bright light reflects from the non-structured area, whereas the blinding reflection disappears on the micro-nano structured surface.