Regensburg 2013 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 14: Biomaterials and Biopolymers I (joint with CPP)
BP 14.1: Hauptvortrag
Dienstag, 12. März 2013, 09:30–10:00, H34
Hierarchical Multi-Step Folding of Polymer Bilayers — Georgi Stoychev1,2, Sebastien Turcaud3, John Dunlop3, and •Leonid Ionov1 — 1Leibniz Institute of Polymer Research Dresden, Hohestr. 6, 01069, Dresden, Germany — 2Technische Universität Dresden, Physical Chemistry of Polymer Materials, 01062, Dresden, Germany — 3Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14424, Potsdam, Germany
We investigated the actuation of patterned bilayers placed on a substrate. We found that films display several kinds of actuation behavior such as wrinkling, bending and folding that result in a variety of shapes. Based on experiments and modeling, we argued that rectangular bilayers start to roll from the corners due to quicker diffusion of water. Rolling from long-side starts later and dominates at high aspect ratio[1].
It was also demonstrated that one can introduce hinges into the folded structure by proper design of the bilayers external shape without having to use site selective deposition of active polymers. Experimental observations lead us to derive four empirical rules backed up by theoretical understanding as well as simulations. We then demonstrated how those rules can be used to direct the folding of edge-activated polymer bilayers through a concrete example - the design of a 3D pyramid[2].
[1] Stoychev et al, "Hierarchical Multi-Step Folding of Polymer Bilayers", Adv.Func.Mat., published online Nov 26, 2012
[2] Stoychev et al, "Shape-Programmed Folding of Stimuli-Responsive Polymer Bilayers", ACS Nano, 2012, 6(5), 3925-3934