Characterization of the Phononic Landscape of Natural Nacre from Abalone Shells.

Autor: Alderete NA; Theoretical and Applied Mechanics, Northwestern University, Evanston, IL, 60208, USA., Sathyan S; Laboratoire d'Acoustique de l'Université du Mans (LAUM), UMR 6613, Institut d'Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, Le Mans, France., Raetz S; Laboratoire d'Acoustique de l'Université du Mans (LAUM), UMR 6613, Institut d'Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, Le Mans, France., Margueritat J; Universite Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, F-69622, France., Asgari M; Department of Mechanical Engineering, Northwestern University, Evanston, IL, 60208, USA., Boechler N; Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA, 92093, USA.; Program in Materials Science and Engineering, University of California San Diego, La Jolla, CA, 92093, USA., Ghanem MA; Universite Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, F-69622, France., Espinosa HD; Theoretical and Applied Mechanics, Northwestern University, Evanston, IL, 60208, USA.; Department of Mechanical Engineering, Northwestern University, Evanston, IL, 60208, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Nov 26, pp. e2407959. Date of Electronic Publication: 2024 Nov 26.
DOI: 10.1002/smll.202407959
Abstrakt: Natural design and fabrication strategies have long served as a source of inspiration for novel materials with enhanced properties. Less investigated is the prospect of leveraging the complexity of readily available, naturally occurring micro-/nanostructures as platforms for investigating functional materials. In the field of phononics, exploiting structural biocomposites is gaining traction; but finding natural phononic structures that interact with ultra- and hypersonic acoustic waves remains an open quest. In this context, the phononic behavior of natural Nacre, a biocomposite often looked at for inspiration due to its superlattice-like architecture of alternating organic and inorganic phases, is here characterized. To such end, a combination of non-contact pump-probe laser ultrasonics techniques and Brillouin spectroscopy are employed to interrogate Nacre's hierarchical structure at the micro- and nanoscale and measure its phononic dispersion behavior in the MHz and GHz range. It is found that for wavelengths longer than the brick-and-mortar characteristic length, Nacre behaves as a dispersionless medium with effective transversely isotropic properties; but as the wavelengths become comparable to its structural periodicity an involved phononic spectrum arises which challenges the notion of a perfectly periodic, high mechanical-contrast biocomposite.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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