Print Email Facebook Twitter Spiral honeycomb microstructured bacterial cellulose for increased strength and toughness Title Spiral honeycomb microstructured bacterial cellulose for increased strength and toughness Author Yu, K. (TU Delft BN/Marie-Eve Aubin-Tam Lab; Kavli institute of nanoscience Delft) Balasubramanian, S. (TU Delft BN/Marie-Eve Aubin-Tam Lab; TU Delft Emerging Materials; Kavli institute of nanoscience Delft) Pahlavani, H. (TU Delft Biomaterials & Tissue Biomechanics) Mirzaali, Mohammad J. (TU Delft Biomaterials & Tissue Biomechanics) Zadpoor, A.A. (TU Delft Biomaterials & Tissue Biomechanics) Aubin-Tam, M.E. (TU Delft BN/Marie-Eve Aubin-Tam Lab; Kavli institute of nanoscience Delft) Date 2020 Abstract Natural materials, such as nacre and silk, exhibit both high strength and toughness due to their hierarchical structures highly organized at the nano-, micro-, and macroscales. Bacterial cellulose (BC) presents a hierarchical fibril structure at the nanoscale. At the microscale, however, BC nanofibers are distributed randomly. Here, BC self-Assembles into a highly organized spiral honeycomb microstructure giving rise to a high tensile strength (315 MPa) and a high toughness value (17.8 MJ m-3), with pull-out and de-spiral morphologies observed during failure. Both experiments and finite-element simulations indicate improved mechanical properties resulting from the honeycomb structure. The mild fabrication process consists of an in situ fermentation step utilizing poly(vinyl alcohol), followed by a post-Treatment including freezing-Thawing and boiling. This simple self-Assembly production process is highly scalable, does not require any toxic chemicals, and enables the fabrication of light, strong, and tough hierarchical composite materials with tunable shape and size. Subject bio-inspired materialsbiocompositescellular materialsself-Assemblysustainability To reference this document use: http://resolver.tudelft.nl/uuid:4e19ef58-b3ff-4337-8130-e81a09b5ad59 DOI https://doi.org/10.1021/acsami.0c15886 ISSN 1944-8244 Source ACS applied materials & interfaces, 12 (45), 50748–50755 Part of collection Institutional Repository Document type journal article Rights © 2020 K. Yu, S. Balasubramanian, H. Pahlavani, Mohammad J. Mirzaali, A.A. Zadpoor, M.E. Aubin-Tam Files PDF acsami.0c15886.pdf 4.74 MB Close viewer /islandora/object/uuid:4e19ef58-b3ff-4337-8130-e81a09b5ad59/datastream/OBJ/view