As meticulously observed and recorded by Darwin, the leaves of the carnivorous plant Drosera capensis L. slowly fold around insects trapped on their sticky surface in order to ensure their digestion. While the biochemical signaling driving leaf closure has been associated with plant growth hormones, how mechanical forces actuate the process is still unknown. Here, we combine experimental tests of leaf mechanics with quantitative measurements of the leaf microstructure and biochemistry to demonstrate that the closure mechanism is programmed into the cellular architecture of D. capensis leaves, which converts a homogeneous biochemical signal into an asymmetric response. Inspired by the leaf closure mechanism, we devise and test a mechanical metamaterial, which curls under homogeneous mechanical stimuli. This kind of metamaterial could find possible applications as a component in soft robotics and provides an example of bio-inspired design.
Metamaterial architecture from a self-shaping carnivorous plant / C.A.M. La Porta, M.C. Lionetti, S. Bonfanti, S. Milan, C. Ferrario, D. Rayneau-Kirkhope, M. Beretta, M. Hanifpour, U. Fascio, M. Ascagni, L. De Paola, Z. Budrikis, M. Schiavoni, E. Falletta, A. Caselli, O. Chepizhko, A. Tuissi, A. Vailati, S. Zapperi. - In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. - ISSN 0027-8424. - 116:38(2019 Sep 26), pp. 18777-18782.
|Titolo:||Metamaterial architecture from a self-shaping carnivorous plant|
LA PORTA, CATERINA (Primo) (Corresponding)
LIONETTI, MARIA CHIARA (Secondo)
VAILATI, ALBERTO (Penultimo)
ZAPPERI, STEFANO (Ultimo) (Corresponding)
|Parole Chiave:||Drosera capensis; bending; biomechanics; metamaterials|
|Settore Scientifico Disciplinare:||Settore MED/04 - Patologia Generale|
Settore FIS/03 - Fisica della Materia
|Progetto:||Size effects in fracture and plasticity|
On demand design of reversible shape changing metamaterials (METADESIGN)
|Data di pubblicazione:||26-set-2019|
|Data ahead of print / Data di stampa:||26-ago-2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1073/pnas.1904984116|
|Appare nelle tipologie:||01 - Articolo su periodico|