Regensburg 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity I

CPP 22.7: Hauptvortrag

Mittwoch, 13. März 2013, 11:30–12:00, H34

Wetting transitions in polymer decorated nanostructured surfaces — •Jürgen Rühe — Institut für Mikrosystemtechnik, Universität Freiburg, 79110 Freiburg

We describe the generation of well defined micro- and nanostructured surfaces with surface-attached polymer monolayers. To this high aspect ratio micro- and nanostructured surfaces are generated in silicon through lithography, the Bosch process or DRIE process. In the first case well defined post structures, in the latter silicon nanograss structures are obtained. The silicon structures are coated with self-assembled monolayers containing benzophenon groups. These monolayers are used for a photoinduced attachment of polymer monolayer to these surfaces. We study the wetting properties of such surfaces as a function of the surface energy of the polymer involved. Superwetting, Wenzel-type of wetting and superhydrophobic properties can be observed. In some cases roll-off angles well below <1° are observed. It is found that such surfaces show very distinct wetting transitions, where even minor changes in the surface energy of the coating cause huge changes in the contact angle.