Typical examples to explain hydrophobic (“fear of water”) behaviour are lotus flowers (“lotus effect”) and many other leaves. Hydrophobicity can be reached by changing the chemical structure of materials, with or without additives. Today, there are various approaches to reach this goal, either by right polymer selection (i.e. PP – polypropylene), special nano coatings, chemicals or bionic nano particles in polymers. In example, Scientists at ETH Zurich have developed a novel polymer for coating materials, in order to prevent biofilms from forming on their surfaces, where also microfabricated pillar-to-hole gradient is used to explore the influence of morphology on wetting, or silver nanoparticles are fabricated combining a silver film on a silicon substrate.