A bioinspired and hierarchically structured shape-memory material
| Autor: | Christophe O. Chantre, Suji Choi, Grant M. Gonzalez, Rudy Gabardi, Kwanwoo Shin, Juncheol Lee, Myung Chul Choi, Luca Cera, Kevin Kit Parker, Qihan Liu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Fabrication Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Structuring Liquid crystal Hierarchical organization General Materials Science Animal hair Tissue Engineering Tissue Scaffolds Mechanical Engineering Control reconfiguration General Chemistry Shape-memory alloy 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Smart Materials Mechanics of Materials Printing Three-Dimensional Keratins Fibre spinning 0210 nano-technology |
| Zdroj: | Nature Materials. 20:242-249 |
| ISSN: | 1476-4660 1476-1122 |
| Popis: | 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. Shear-aligned keratin protofibres are used to fabricate shape-memory fibres and three-dimensional scaffolds that respond to water. |
| Databáze: | OpenAIRE |
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