3D Printing of Ultralight Biomimetic Hierarchical Graphene Materials with Exceptional Stiffness and Resilience
3D Printing of Ultralight Biomimetic Hierarchical Graphene Materials with Exceptional Stiffness and Resilience
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具有卓越刚度和弹性的超轻仿生分层石墨烯材料的 3D 打印
DOI：
10.1002/adma.201902930
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发表时间：
2019-08-01
影响因子：
29.4
通讯作者：
Jiang, Lin
中科院分区：
文献类型：
--
作者：
Peng, Meiwen;Wen, Zhen;Jiang, Lin
具有分层结构的生物材料（例如，宏观中空结构和微观蜂窝结构）为设计和制造具有优异机械性能和低密度的先进仿生材料提供了独特的灵感。大多数传统的仿生材料仅受益于单一长度尺度的生物启发架构（例如，微观材料结构），这在很大程度上限制了所得材料的机械性能。通过利用生物启发的层次结构来最大化仿生材料的机械性能，存在着巨大的潜力。展示了一种基于油墨的三维（3D）打印策略，以制造具有极高刚度和弹性的超轻仿生分层石墨烯材料（BHGM）。通过同时设计3D打印的宏观中空结构和构建冰晶诱导的细胞微观结构，BHGM可以在高达95%的压缩应变下实现弹性和稳定性。多尺度有限元分析表明，BHGM的分级结构有效地降低了宏观应变，并将微观压缩变形转化为相互连接的石墨烯片的旋转和弯曲。这种3D打印策略展示了将其他功能材料组装成分层细胞结构的巨大潜力，适用于同时需要低密度高刚度和弹性的各种应用。
Biological materials with hierarchical architectures (e.g., a macroscopic hollow structure and a microscopic cellular structure) offer unique inspiration for designing and manufacturing advanced biomimetic materials with outstanding mechanical performance and low density. Most conventional biomimetic materials only benefit from bioinspired architecture at a single length scale (e.g., microscopic material structure), which largely limits the mechanical performance of the resulting materials. There exists great potential to maxime the mechanical performance of biomimetic materials by leveraging a bioinspired hierarchical structure. An ink‐based three‐dimensional (3D) printing strategy to manufacture an ultralight biomimetic hierarchical graphene material (BHGMs) with exceptionally high stiffness and resilience is demonstrated. By simultaneously engineering 3D‐printed macroscopic hollow structures and constructing an ice‐crystal‐induced cellular microstructure, BHGMs can achieve ultrahigh elasticity and stability at compressive strains up to 95%. Multiscale finite element analyses indicate that the hierarchical structures of BHGMs effectively reduce the macroscopic strain and transform the microscopic compressive deformation into the rotation and bending of the interconnected graphene flakes. This 3D printing strategy demonstrates the great potential that exists for the assembly of other functional materials into hierarchical cellular structures for various applications where high stiffness and resilience at low density are simultaneously required.