Dresden 2003 – scientific programme
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DY: Dynamik und Statistische Physik
DY 22: Soft matter II
DY 22.3: Talk
Tuesday, March 25, 2003, 11:15–11:30, G\"OR/226
Dewetting Patterns Captured by Minkowski Measures — •Renate Konrad1, Hubert Mantz1, Klaus Mecke2, and Karin Jacobs3 — 1Dept. of Applied Physics, University of Ulm, 89069 Ulm — 2MPI for Metal Research, Heisenbergstr. 1, 70569 Stuttgart — 3Experimental Physics, Saarland University, 66041 Saarbrücken
Dewetting of a thin polymer film is a dynamical process in the course of which complex morphologies evolve and which moreover is an ideal system to study 2d spinodal decomposition. Recording peculiarities of the process in the experiment, we can determine system parameters like the free energy or the viscosity. Using these parameters, realistic simulations (performed by G. Grün and J. Becker, Uni Bonn) are possible. Both the scanning probe microscopy experiments and the simulations - based on lubrication approximation - result in topographical maps of the films. In order to characterize the dewetting process in experiments and simulations quantitatively, we use integral geometrical methods: The maps are sliced into isosurfaces, on top of which we determine the Minkowski measures. The results show that the simulations mimic the experimental system quite successfully [1] and we find scaling laws in the dynamical behavior of the experimental system that call for a theoretical explanation. We moreover compare the analysis by Minkowski measures with ‘traditional’ image analysis procedures like Fourier transformation.
[1] J. Becker et al., Nature Materials 2 (2003) 59