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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.66: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
In-Situ Observation of Wrinkle-Formation via UV/Ozone Oxidation — •Bernhard Glatz1, Moritz Tebbe1, Andreas Schedl2, and Andreas Fery1 — 1Department of Physical Chemistry 2, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany — 2Department of Macromolecular Chemistry 1, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
Wrinkled surfaces are versatile tools on the micro- and nano-range, e.g. in their use as photonic crystals or for particle alignment. They can be formed by straining soft substrates that are coated with a thin hard film. The wavelength and amplitude of the resulting periodic surface deformations strongly depends on processing conditions, the thickness of the thin film and mechanical properties of film and substrate. Wavelengths between sub-micron and macroscopic range are accessible, however defect structures like cracks and wrinkle branches are inevitable side features in wrinkling processes and furthermore non-predictable yet.
To better understand defect formation, we developed a setup, which allows observation an in-situ view of currently forming waves and their defect structures via Light Microscopy. We applied the system for investigation of defect formation in systems, which posses defined gradients in elastic constants [1]. We find that rather than appearing in a random fashion, branching defects become ordered and we discuss implications of this finding for the formation of hierarchical structures.
[1] K. U. Claussen, M. Tebbe, R. Giesa, A. Schweikart, A. Fery and H.-W. Schmidt, 2012, RSC Advances, 2 - 27, 10185 - 10188