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Spiral Honeycomb Microstructured Bacterial Cellulose for Increased Strength and Toughness.


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.

SUBMITTER: Yu K 

PROVIDER: S-EPMC7662910 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Spiral Honeycomb Microstructured Bacterial Cellulose for Increased Strength and Toughness.

Yu Kui K   Balasubramanian Srikkanth S   Pahlavani Helda H   Mirzaali Mohammad J MJ   Zadpoor Amir A AA   Aubin-Tam Marie-Eve ME  

ACS applied materials & interfaces 20201028 45


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<sup>  ...[more]

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