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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Responsive and Adaptive Systems

CPP 8.8: Talk

Monday, March 27, 2023, 12:45–13:00, ZEU 255

Stimuli-responsive high aspect ratio surfaces for wetting studies — •Gissela Constante1, Indra Apsite1, Paul Auerbach2, Sebastian Aland3, Dennis Schönfeld3, Thorsten Pretsch3, Pavel Milkin1, and Leonid Ionov1,41Uni Bayreuth, Bayreuth, Germany — 2HTW Dresden, Dresden, Germany — 3Fraunhofer IAP, Postdam, Germany — 4BPI, 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 exceptionally 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 and by it the deformation and recovery of the original 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 variation of temperature conducted by direct heating/cooling or by exposure to light when the lamellae were stained with black ink. 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.

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