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Towards in situ determination of 3D strain and reorientation in the interpenetrating nanofibre networks of cuticle

DOI: 10.1039/C7NR02139A DOI Help

Authors: Yi Zhang (Queen Mary University of London; Deutsches Elektronen-Synchrotron DESY) , Paolino De Falco (Queen Mary University of London) , Yanhong Wang (Queen Mary University of London) , Ettore Barbieri (Queen Mary University of London) , Oskar Paris (Montanuniversitaet Leoben) , Nick J. Terrill (Diamond Light Source) , Gerald Falkenberg (Deutsches Elektronen-Synchrotron DESY) , Nicola M. Pugno (University of Trento; Queen Mary University of London; Italian Space Agency) , Himadri S. Gupta (Queen Mary University of London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanoscale

State: Published (Approved)
Published: July 2017

Abstract: Determining the in situ 3D nano- and microscale strain and reorientation fields in hierarchical nanocomposite materials is technically very challenging. Such a determination is important to understand the mechanisms enabling their functional optimization. An example of functional specialization to high dynamic mechanical resistance is the crustacean stomatopod cuticle. Here we develop a new 3D X-ray nanostrain reconstruction method combining analytical modelling of the diffraction signal, fibre-composite theory and in situ deformation, to determine the hitherto unknown nano- and microscale deformation mechanisms in stomatopod tergite cuticle. Stomatopod cuticle at the nanoscale consists of mineralized chitin fibres and calcified protein matrix, which form (at the microscale) plywood (Bouligand) layers with interpenetrating pore-canal fibres. We uncover anisotropic deformation patterns inside Bouligand lamellae, accompanied by load-induced fibre reorientation and pore-canal fibre compression. Lamination theory was used to decouple in-plane fibre reorientation from diffraction intensity changes induced by 3D lamellae tilting. Our method enables separation of deformation dynamics at multiple hierarchical levels, a critical consideration in the cooperative mechanics characteristic of biological and bioinspired materials. The nanostrain reconstruction technique is general, depending only on molecular-level fibre symmetry and can be applied to the in situ dynamics of advanced nanostructured materials with 3D hierarchical design.

Subject Areas: Technique Development, Biology and Bio-materials


Instruments: I22-Small angle scattering & Diffraction