Electrically assisted 3D printing of nacre-inspired structures with self-sensing capability
Electrically assisted 3D printing of nacre-inspired structures with self-sensing capability
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DOI：
10.1126/sciadv.aau9490
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发表时间：
2019-04-01
期刊：
影响因子：
13.6
通讯作者：
Chen, Yong
中科院分区：
文献类型：
--
作者：
Yang, Yang;Li, Xiangjia;Chen, Yong
轻质、高强的结构材料在体育、交通、航空航天和生物医学等领域具有重要的应用价值。珍珠层具有高强度和高韧性的砖和砂浆状结构。在这里，我们提出了一种通过电辅助3D打印构建具有复杂三维（3D）形状的珍珠启发层次结构的方法。石墨烯纳米片（GN）在3D打印过程中通过电场（433 V/cm）排列，并作为砖块，聚合物基质作为砂浆。具有对齐的GN（2重量%）的3D打印珍珠层显示出轻质特性（1.06 g/cm（3）），同时表现出与天然珍珠层相当的比韧性和强度。此外，带有对齐GN的3D打印轻型智能装甲可以通过犹豫的电阻变化来感知其伤害。这项研究突出了生物启发结构的有趣可能性，具有集成的机械增强和电气自感知能力，可用于生物医学应用，航空航天工程以及军事和运动装甲。
Lightweight and strong structural materials attract much attention due to their strategic applications in sports, transportation, aerospace, and biomedical industries. Nacre exhibits high strength and toughness from the brickand- mortar-like structure. Here, we present a route to build nacre-inspired hierarchical structures with complex three-dimensional (3D) shapes by electrically assisted 3D printing. Graphene nanoplatelets (GNs) are aligned by the electric field (433 V/cm) during 3D printing and act as bricks with the polymer matrix in between as mortar. The 3D-printed nacre with aligned GNs (2 weight %) shows lightweight property (1.06 g/cm(3)) while exhibiting comparable specific toughness and strength to the natural nacre. In addition, the 3D-printed lightweight smart armor with aligned GNs can sense its damage with a hesitated resistance change. This study highlights interesting possibilities for bioinspired structures, with integrated mechanical reinforcement and electrical self-sensing capabilities for biomedical applications, aerospace engineering, as well as military and sports armors.