A bioinspired and hierarchically structured shape-memory material
Top Cited Papers
- 31 August 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Materials
- Vol. 20 (2), 242-249
- https://doi.org/10.1038/s41563-020-0789-2
Abstract
Shape-memory polymeric materials lack long-range molecular order that enables more controlled and efficient actuation mechanisms. Here, we develop a hierarchical structured keratin-based system that has long-range molecular order and shape-memory properties in response to hydration. We explore the metastable reconfiguration of the keratin secondary structure, the transition from α-helix to β-sheet, as an actuation mechanism to design a high-strength shape-memory material that is biocompatible and processable through fibre spinning and three-dimensional (3D) printing. We extract keratin protofibrils from animal hair and subject them to shear stress to induce their self-organization into a nematic phase, which recapitulates the native hierarchical organization of the protein. This self-assembly process can be tuned to create materials with desired anisotropic structuring and responsiveness. Our combination of bottom-up assembly and top-down manufacturing allows for the scalable fabrication of strong and hierarchically structured shape-memory fibres and 3D-printed scaffolds with potential applications in bioengineering and smart textiles.Funding Information
- Harvard University | Materials Research Science and Engineering Center, Harvard University (DMR-1420570)
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