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In‐situ Monitoring of Photocontrollable Wrinkle Erasure in Azobenzene‐based Supramolecular Systems

Von Wiley-VCH zur Verfügung gestellt

An in situ characterization method that is able to quantify the characteristic time of photoinduced surface wrinkle erasure is presented. The method enables the comparison between different materials in supramolecular complexes, thus facilitating the optimization of these photoactive systems. Additionally, μm-scale motion transfer between buckled material systems is demonstrated.


In this contribution, dynamic photoinduced wrinkle erasure enabled by photomechanical changes in supramolecular polymer-azo complexes was characterized via confocal microscopy. Different photoactive molecules, disperse yellow 7 (DY7) and 4,4′-dihydroxyazobenzene (DHAB), were compared to 4-hydroxy-4′-dimethylaminoazobenzene (OH-azo-DMA). The characteristic erasure times of wrinkles were quickly assessed by using an image processing algorithm. The results confirm that the photoinduced movement on the topmost layer can be successfully transferred to the substrate. Furthermore, the chosen supramolecular strategy allows decoupling the effect of molecular weight of the polymer and photochemistry of the chromophore, allowing quantitative comparison of wrinkling erasure efficiency of different materials and providing a facile way to optimize the system for specific applications.

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