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Pretsch, Thorsten
Fraunhofer Institute for Applied Polymer Research
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2023Controlling malleability of metamaterials through programmable memorycitations
- 2023Reversibly Photoswitchable High‐Aspect Ratio Surfacescitations
- 2022Fibrous Scaffolds for Muscle Tissue Engineering Based on Touch-Spun Poly(Ester-Urethane) Elastomercitations
- 2022Highly Shrinkable Objects as Obtained from 4D Printingcitations
- 2022Fused Filament Fabrication of Actuating Objectscitations
- 2022Shape Memory Polymer Foam for Autonomous Climate-Adaptive Building Envelopescitations
- 2022Recognizing the Potential of 4D-Printing
- 2020Shape Memory Polymer Foam with Programmable Aperturescitations
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article
Reversibly Photoswitchable High‐Aspect Ratio Surfaces
Abstract
Herein, the fabrication of light-sensitive high-aspect ratio surfaces with switchable topography using melt-electrowriting of shape-memory polymers and deposition of light-to-heat converting black ink on it by dip coating is reported on. The lamellae exposed to low temperatures are hard and cannot be deformed by water droplets. The temperature reached upon illumination of surfaces is close to the melting point of the soft segment of the polyurethane that leads to softening of the polymer. Due to this, it is possible to locally deform and recover the light-softened surface structures by water droplets deposited on lamellae. The deformed state can befixed by cooling down resulting in the crystallization of the polymer. Thus, the reversibility of local deformation can be achieved. Finally, the application of the developed approach and materials for the fabrication of smart light-controlled valves is demonstrated, which can be used for the controlled mixing of fluids in microfluidic devices. ; 4 ; 10