Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Focus: Smart Hydrogels and Hydrogel Based Devices II - organized by Gerald Gerlach, Walter Richtering and Thomas Hellweg
CPP 37.10: Vortrag
Mittwoch, 14. März 2018, 12:30–12:45, C 130
Feringa Type Engines in Polymer Model Systems: Folding, Coiling, Molecular Stirling Engines, and Active Gels — •Cornelia Schuster1,2, Michael Lang1, Ron Dockhorn1,2, Martin Wengenmayr1,2, and Jens-Uwe Sommer1,2 — 1Institut Theorie der Polymere, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany — 2Technische Universität Dresden, Institute for Theoretical Physics, Zellescher Weg 17, 01069 Dresden, Germany
We use the bond fluctuation model to study the contraction process of different polymeric model systems with attached Feringa engines, where the top part of the molecule rotates unidirectional with respect to the bottom part upon irradition with light. For a figure of 8 shaped model system, a contraction process is observed that consists of two steps: folding followed by coiling. Double stranded polymers are studied in a slit geometry where either both strands connected to bottom and top of engine are connected to the bottom and top wall respectively (X geometry) or always only one strand connects to a particular wall (H-geometry). The different attachment causes distinct work cycles that allows to consider a Stirling machine that is either efficient at a small (H-geometry) or at a large wall separation (X-geometry). Insertion of the engines as centers of 4-functional stars in star polymer nano-gels leads to gel shrinkage upon irradiation with light as a function of the quantity of adsorbed light. The results of the first two model systems are used to elucidate the effectiveness of the engines inside the gel.