The water contact angle measurements were determined with the Drop Shape Analyser 25B (A. KRÜSS Optronic GmbH, Hamburg, Germany) by the sessile drop method with a drop volume of 8 μL. Three surfaces were investigated for each PTU/ZnO composition and for PDMS and three measurements were conducted on each surface (nine measurements per material variation). The contact angle gives information about the wettability of a surface. If the contact angle exceeds 90° the surface is considered hydrophobic otherwise the surface is considered hydrophilic.

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