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Stoychev, Georgi ; Guiducci, Lorenzo ; Turcaud, Sébastien ; Dunlop, John W. C. ; Ionov, Leonid:
Hole-Programmed Superfast Multistep Folding of Hydrogel Bilayers.
In: Advanced Functional Materials.
Bd. 26
(2016)
Heft 42
.
- S. 7733-7739.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.201602394
Abstract
Two important aspects of actuation behavior of stimuli-responsive hydrogels are the complexity of the shape change and its speed. Here, it is shown that varying the shape of simple polymer bilayers can result in very complex and very fast spontaneous folding. The complexity and high folding rate arise from the choice of the shape and from the presence of inhomogeneous swelling within the thermoresponsive layer entrapped between the top hydrophobic layer and the substrate. In contrast to homogeneous swelling of a freestanding bilayer, which leads to a gradual increase of curvature throughout the whole bilayer, inhomogeneous swelling first results in complete rolling of the periphery of the film, which changes its mechanical properties and affects the subsequent morphing process. Further swelling of the thermoresponsive layer generates more stress that builds up until a buckling threshold is overcome, allowing very fast switching from the flat edge-rolled configuration into a folded one. The research demonstrates how the introduction of holes into actuating bilayers gives rise not only to a novel geometric control over the folding fate of the films but also adds the ability to tune the rate of folding, through the careful selection of hole size, location, and shape.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | actuators; folding; hydrogels; polymers; responsive materials |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften > Professur Biofabrikation > Professur Biofabrikation - Univ.-Prof. Dr. Leonid Ionov Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Professur Biofabrikation |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 19 Jun 2017 13:29 |
| Letzte Änderung: | 10 Mär 2022 10:21 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/37681 |