A damage-tolerant, dual-scale, single-crystalline microlattice in the knobby starfish, Protoreaster nodosus
A damage-tolerant, dual-scale, single-crystalline microlattice in the knobby starfish, Protoreaster nodosus
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DOI：
10.1126/science.abj9472
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发表时间：
2022-02-11
期刊：
影响因子：
56.9
通讯作者：
Li, Ling
中科院分区：
文献类型：
--
作者：
Yang, Ting;Chen, Hongshun;Li, Ling
多孔固体（例如，泡沫体和蜂窝体）由于其高机械效率和可定制的性质而广泛存在于自然和工程系统中。虽然这些材料通常是基于多晶或无定形成分，在这里，我们报告了一个不寻常的双尺度，单晶微晶发现在生物矿化骨架的多节海星，Protorasternodosus。这种结构具有金刚石三重周期性最小表面几何形状（晶格常数，约30微米），其[111]方向在原子尺度上与构成方解石的c轴对齐。这种双尺度晶体学共取向的微晶格，它表现出晶格级结构梯度和位错，结合原子级贝壳状断裂行为的生物方解石，大大提高了这种层次的生物微晶格的损伤容限，从而提供了重要的见解设计合成架构的细胞固体。
Cellular solids (e.g., foams and honeycombs) are widely found in natural and engineering systems because of their high mechanical efficiency and tailorable properties. While these materials are often based on polycrystalline or amorphous constituents, here we report an unusual dual-scale, single-crystalline microlattice found in the biomineralized skeleton of the knobby starfish, Protoreaster nodosus. This structure has a diamond-triply periodic minimal surface geometry (lattice constant, approximately 30 micrometers), the [111] direction of which is aligned with the c-axis of the constituent calcite at the atomic scale. This dual-scale crystallographically coaligned microlattice, which exhibits lattice-level structural gradients and dislocations, combined with the atomic-level conchoidal fracture behavior of biogenic calcite, substantially enhances the damage tolerance of this hierarchical biological microlattice, thus providing important insights for designing synthetic architected cellular solids.