Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Poster Session III-2
CPP 51.13: Poster
Tuesday, March 17, 2020, 14:00–16:00, P2/EG
Investigation of Non-Equilibrium Bending Dynamics of Microgel Disks — •Niklas O. Junker1, Felix Jiang1, Oliver Jung2, Sebastian Meyer1, Dmitry N. Chigrin1,2, Ahmed Mourran2, Martin Möller2, and Gero von Plessen1 — 1Institute of Physics (IA), RWTH Aachen, Germany — 2DWI - Leibniz Institute for Interactive Materials, Aachen, Germany
Microgels are cross-linked polymer networks of micrometer or submicrometer dimensions which, in a solvent, can undergo large and fast volume changes in response to variations of external parameters (temperature, pH, etc.). Due to such volume changes, bilayers consisting of a hydrogel and a passive elastic material are known to show bending behavior. In the present work, bilayer disks of elliptical shape and consisting of a gold-nanorod-loaded, 5 micrometer thick poly(N-isopropylacrylamide) (PNIPAm) layer and a gold nanolayer are investigated in water. Non-equilibrium actuation dynamics triggered by conventional and photothermal heating is observed. The microgel structures are found to bend differently upon conventional temperature changes than upon photothermal heating. This behavior is systematically studied for different heating rates (up to 20°C/min for conventional heating and up to 1°C/ms for photothermal heating, in which the gold nanorods are used as photoabsorbers and local heaters).