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Dewetting of thin films on heterogeneous substrates: Pinning versus coarsening

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Brusch,  L.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Thiele,  U.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Bär,  M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Brusch, L., Kühne, H., Thiele, U., & Bär, M. (2002). Dewetting of thin films on heterogeneous substrates: Pinning versus coarsening. Physical Review E, 66(1): 011602. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLEEE8000066000001011602000001&idtype=cvips&gifs=yes.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-3749-B
Abstract
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 that of the critical dewetting mode, weak heterogeneities are sufficient for pinning. Our results imply a large region of coexistence between coarsening dynamics and pinning.