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Honeycomb actuators inspired by the unfolding of ice plant seed capsules

MPS-Authors
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Guiducci,  Lorenzo
John Dunlop, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Razghandi,  Khashayar
Michaela Eder, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Bertinetti,  Luca
Luca Bertinetti (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Turcaud,  Sébastien
John Dunlop, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Fratzl,  Peter
Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Dunlop,  John W. C.
John Dunlop, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Guiducci, L., Razghandi, K., Bertinetti, L., Turcaud, S., Rüggeberg, M., Weaver, J. C., et al. (2016). Honeycomb actuators inspired by the unfolding of ice plant seed capsules. PLoS One, 11(11): e0163506. doi:10.1371/journal.pone.0163506.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-BCE7-7
Abstract
Plant hydro-actuated systems provide a rich source of inspiration for designing autonomously morphing devices. One such example, the pentagonal ice plant seed capsule, achieves complex mechanical actuation which is critically dependent on its hierarchical organization. The functional core of this actuation system involves the controlled expansion of a highly swellable cellulosic layer, which is surrounded by a non-swellable honeycomb framework. In this work, we extract the design principles behind the unfolding of the ice plant seed capsules, and use two different approaches to develop autonomously deforming honeycomb devices as a proof of concept. By combining swelling experiments with analytical and finite element modelling, we elucidate the role of each design parameter on the actuation of the prototypes. Through these approaches, we demonstrate potential pathways to design/develop/construct autonomously morphing systems by tailoring and amplifying the initial material's response to external stimuli through simple geometric design of the system at two different length scales.