Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.17: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Thermal nucleation in ultra thin polymer films on slippery hydrophobic substrates — •Matthias Lessel1, Mischa Klos1, Joshua D. McGraw1, Oliver Bäumchen2, and Karin Jacobs1 — 1Saarland University, Experimental Physics, D-66041 Saarbrücken — 2Max Planck Institute for Dynamics & Self-Organization (MPI-DS), D-37077 Göttingen
Spinodal dewetting of thin polystyrene films is subject of many studies (Seemann et al. PRL 2001, Becker et al. Nat. Mat. 2003). Typically, hydrophilic silicon wafers are used as substrates and a no-slip boundary condition is assumed. Here, we modify silicon wafers with self assembled silane monolayers. The silane substrates provide a slip boundary condition and render the surface hydrophobic. Despite the different surface energy, the hydrophobic coating does not change the long-range van der Waals interactions as compared to hydrophilic silicon wafers. Thus, these systems may dewet spinodally. However, in the experiments, a much higher hole density is observed for hydrophobic wafers than is theoretically expected. We find that the hole density on these substrates is influenced by the dewetting temperature and film thickness. The former leads to the hypothesis of thermal nucleation instead of spinodal dewetting as the hole generating mechanism.