Laser Zentrum Hannover e.V.
Superhydrophobic surfaces can be fabricated using e.g. laser-induced stochastic structures. Unfortunately, the laser process is cost-intensive because this surface functionalization takes a relatively long time and in addition the stochastic structures only form at very short pulse durations, in the pico respectively femtosecond regime. One approach is to provide a mold with the negative of a superhydrophobic surface and then use a fast, cost-effective manufacturing process, such as injection molding to apply the microstructures to the component. Molding has another advantage. Because of the radiation and the high temperatures during direct laser processing usually also chemically change the material to be processed, which can be avoided with injection molding. Therefore, in this work, inserts for injection molds were processed with a femtosecond laser and different stochastic structures were generated. Samples were then produced using injection molding with various olefin polymers, including Cyrolite, Styrolution, Borealis and Zeonex. Subsequently, the various microstructures, both on the inserts and on the samples were examined by laser scanning microscopy. In addition, the samples were analyzed by measuring the water contact angle. It has been shown that some but not all molded structures do exhibit superhydrophobic behavior.
Abstract
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