|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Biological Materials Science
||Capturing the Geometry, Microstructure and Mechanical Properties of Marine Diatom Frustules Using Nanoscale Silica Structures
||Shi Luo, Julia R Greer
|On-Site Speaker (Planned)
Diatoms are single-cell algae that form a hard cell wall made of a silica/organic composite. One fascinating aspect of such biosilica shells (frustules) is their intricate and varied architecture. The geometry and design of diatom frustules provide them with extraordinary strength-to-weight ratio. We fabricated silica architectures that fully replicate the diatom geometry using two-photon lithography. These biomimetic structures have a completely amorphous microstructure, and elastic modulus that matches that of the natural diatom biosilica. Three-point bending experiments show these mimetic structures possess comparable strength to natural diatom samples. We also demonstrate fracture properties of natural diatom frustules, and show that the mimetic silica structures have similar fracture toughness and crack-propagation characteristics. The ability to replicate the geometry of diatom frustules down to the nanoscale and capture their mechanical strength can provide a versatile platform for future investigation of such systems.
||Planned: Supplemental Proceedings volume