Sebastian Kamps ¹

Florian Eder¹, Anett Berndt¹, Prof. Dr. W. Ensinger²

For several years already coating of surfaces with functional films has been a common method to improve their usability, durability or optical appearance. Even for house-hold use, there is a broad range of products providing easy-to-clean, anti-fouling, or anti-static functionality on the applied surfaces. This boom of functional coatings was due to the fact, that the raw materials were available in large quantities at low costs and the final coating layers were easy to apply and showed a long term effect.

For some applications, like anti-icing, it might become important to introduce a certain structure or roughness into the functional layer to increase its efficiency. In the case of super-hydrophobic surfaces it is well known from the lotus leaf, that a combination of a complex micro- and nano-structure together with a hydrophobic surface functionality leads to super-hydrophobic effect with water-contact angles > 150°.

Various attempts by many research groups have been made to copy this example from nature. It was possible to reproduce this effect on various substrates by wet- or plasma-processes. Still there are obstacles to overcome regarding the layers mechanical durability, hydrolytic stability or cost-efficient applicability on large or complex shaped surfaces.

Therefore the aim of this thesis is to find materials and processes allowing the deposition of coatings with very low surface energies, reasonable production and application costs and a good mechanical stability and durability. Various ways of structurization will be used while focussing on the simplicity of the process. Special attention will be given to the generation of functional surfaces with a double-roughness. The final functionality will be generated by applying organo-functional polysiloxanes with perflourinated groups according to the sol gel method.

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