Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

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

O: Fachverband Oberflächenphysik

O 55: Poster Session - Nanostructured Surfaces and Thin Films

O 55.1: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/2OG

Dynamic contact angles on adaptive surfaces — •Xiaomei Li, Simon Silge, Hans-Jürgen Butt, and Rüdiger Berger — Max-Planck-Institut for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

Adaptive surfaces change their physical-chemical properties due to the presence of a liquid or its vapor. Surface adaptation is predicted to be one cause for contact angle hysteresis [1]. We measured the dynamic advancing and receding contact angles of sliding drops on 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFDTES) surfaces and on polystyrene-poly(acrylic acid) (PS-PAA) copolymer surfaces using a home-built tilted plane setup. PFDTES surfaces as example for a non-adaptive surfaces were prepared by chemical vapor deposition. PS-PAA copolymer surfaces as adaptive surfaces were fabricated by spin-coating. Two modes of adaptation were investigated: velocity dependent contact angles which reflect adaptation time scales from 5 ms to 2 s and drop-wise adaptation for adaptation time scales >10 s. The velocity dependent contact angles are compared to predictions from the hydrodynamic and molecular kinetic theories. The latter potentially allows modeling of dynamic contact angles and contact angle hysteresis caused by adaptation processes. [1] Hans-Jürgen Butt, Rüdiger Berger, Werner Steffen , Doris Vollmer, Stefan A. L. Weber, Langmuir, 34, 11292 - 11304 (2018).