材料科学
形状记忆合金
制作
纳米技术
控制重构
角蛋白
计算机科学
复合材料
医学
病理
嵌入式系统
替代医学
作者
Luca Cera,Grant M. Gonzalez,Qihan Liu,Suji Choi,Christophe O. Chantre,Juncheol Lee,Rudy Gabardi,Myung Chul Choi,Kwanwoo Shin,Kevin Kit Parker
出处
期刊:Nature Materials
[Springer Nature]
日期:2020-08-31
卷期号:20 (2): 242-249
被引量:98
标识
DOI:10.1038/s41563-020-0789-2
摘要
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.
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