Communication Dans Un Congrès Année : 2025

Elastic wave propagation in diatom frustules

Résumé

Diatoms are microscopic algae encapsulated inside a silica inorganic exoskeleton called frustule featuring a complex quasi-regular and hierarchical distribution of micro- and nano-scaled pores. The mechanical and optical behaviors of these biological systems have already been investigated in literature, demonstrating that the 3D hierarchical pore distribution is responsible for (i) enhanced mechanical strength and (ii) it confers to these micro-algae a photonic crystal behavior, used for solar protection and optimizing photosynthesis features. By contrast, their acoustic behavior remains elusive, so far. In this preliminary study, we start unveiling the effects of the complex and hierarchical architecture of diatom frustules on the propagation of elastic waves. Firstly, we observe the in-plane and cross-section distribution of pores for different diatom species by Scanning Electron Microscopy (SEM) and Focused Ion Beam Scanning Electron Microscopy (FIB-SEM), respectively. Then, we reconstruct the diatom 3D architecture into a FE model, and we numerically demonstrate that the quasi- regular arrangement of pores of some diatom frustules make them behave as phononic crystals thanks to the presence of elastic bandgaps. This study could help to shed light on the comprehension of the elasto-dynamic behavior of these biological systems, largely unexplored, so far.

Fichier non déposé

Dates et versions

hal-05366196 , version 1 (14-11-2025)

Identifiants

  • HAL Id : hal-05366196 , version 1

Citer

Chiara Gazzola, Xin Zhou, David Troadec, Marco Miniaci. Elastic wave propagation in diatom frustules. CFA 2025 - 17e Congrès Français d'Acoustique, Société Française d'Acoustique (SFA), Apr 2025, Paris, France. ⟨hal-05366196⟩
52 Consultations
0 Téléchargements

Partager

  • More