Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Wetting, Fluidics and Liquids at Interfaces and Surfaces
CPP 7.5: Vortrag
Montag, 5. September 2022, 12:00–12:15, H39
Tunable lamellar topography driven by wetting dynamics — •Gissela Constante1, Indra Apsite1, Paul Auerbach2, Sebastian Aland2, Dennis Schönfeld3, Thorsten Pretsch3, Pavel Milkin1, and Leonid Ionov1,4 — 1University of Bayreuth, Bayreuth, Germany — 2Hochschule für Technik und Wirtschaft Dresden, Dresden, Germany — 3Fraunhofer Institute for Applied Polymer Research IAP, Postdam, Germany — 4Bavarian Polymer Institute, Bayreuth, Germany
The fabrication of switchable surfaces has been of interest in several fields such as biotechnology, industry, and others. The selection of materials and methods is crucial to provide proper control on the tunable surface. In this research, an exceptional high aspect ratio lamellar surface topography was fabricated by melt-electrowriting of microfibers of a shape-memory thermo-responsive polyurethane. Two different types of stimuli: temperature and light exposition were applied to modify the mechanical properties of shape memory polymer and thus program deformation and recovery of the surface. Wetting studies showed that the deformation of the high aspect ratio lamellar surface can be tunned not only manually, but as well by a liquid droplet. This behavior is controlled by temperature changes during direct heating/cooling or by exposure to light. The liquid in combination with thermo-responsive topography presents a new type of wetting behavior. This feature opens the possibility to apply such topographies for the design of smart elements for microfluidic devices, for example, smart valves.