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Artificial Tendrils Mimicking Plant Movements by Mismatching Modulus and Strain in Core and Shell
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Andraž Rešetič ,
Anil Bastola,
Marc Behl,
Thomas Speck ,
Andreas Lendlein
Advanced Materials, Volume: 35, Issue: 22
Swansea University Author: Anil Bastola
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DOI (Published version): 10.1002/adma.202211902
Abstract
Motile organs have evolved in climbing plants enabling them to find a support and, after secure attachment, to reach for sunlight without investing in a self-supporting stem. Searching movements, the twining of stems, and the coiling of tendrils are involved in successful plant attachment. Such coil...
| Published in: | Advanced Materials |
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| ISSN: | 0935-9648 1521-4095 |
| Published: |
Wiley
2023
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa65770 |
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| Abstract: |
Motile organs have evolved in climbing plants enabling them to find a support and, after secure attachment, to reach for sunlight without investing in a self-supporting stem. Searching movements, the twining of stems, and the coiling of tendrils are involved in successful plant attachment. Such coiling movements have great potential in robotic applications, especially if they are reversible. Here, the underlying mechanism of tendril movement based on contractile fibers is reported, as illustrated by a function–morphological analysis of tendrils in several liana species and the encoding of such a principle in a core–shell multimaterial fiber (MMF) system. MMFs are composed of a shape-memory core fiber (SMCF) and an elastic shell. The shape-memory effect of the core fibers enables the implementation of strain mismatch in the MMF by physical means and provides thermally controlled reversible motion. The produced MMFs show coiling and/or uncoiling behavior, with a high reversible actuation magnitude of ≈400%, which is almost 20 times higher compared with similar stimuli for sensitive soft actuators. The movements in these MMFs rely on the crystallization/melting behavior of oriented macromolecules of SMCF. |
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| Keywords: |
actuators; elastic modulus; multimaterial fibers; pre-straining; tendrils |
| College: |
Faculty of Science and Engineering |
| Funders: |
Open access funding enabled and organized by Projekt DEAL.
Helmholtz Association
European Union's Horizon 2020. Grant Number: No. 824074
Deutsche Forschungsgemeinschaft. Grant Number: EXC-2193/1-390951807 |
| Issue: |
22 |