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DY: Dynamik und Statistische Physik

DY 17: Kritische Ph
änomene und Phasenumwandlungen II

DY 17.2: Vortrag

Montag, 11. März 2002, 16:30–16:45, H3

Dewetting of thin films on heterogeneous substrates: Pinning vs. coarsening — •Lutz Brusch, Heiko Kühne, Uwe Thiele, and Markus Bär — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, D-01187 Dresden

We study a model for a thin liquid film dewetting from a periodic heterogeneous substrate (template). The amplitude and periodicity of a striped template heterogeneity necessary to obtain a stable periodic stripe pattern, i. e. pinning, are computed. This requires a stabilization of the longitudinal and transversal modes driving the typical coarsening dynamics during dewetting of a thin film on a homogeneous substrate. If the heterogeneity has a larger spatial period than the critical dewetting mode, weak heterogeneities are sufficient for pinning. A large region of coexistence between coarsening dynamics and pinning is found.