Transforming Auxetic Metamaterials into Superhydrophobic Surfaces
Transforming Auxetic Metamaterials into Superhydrophobic Surfaces
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DOI：
10.1002/sstr.202300458
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发表时间：
2024-01-17
期刊：
影响因子：
15.9
通讯作者：
Evans，Kenneth E.
中科院分区：
文献类型：
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作者：
Mchale，Glen;Alderson，Andrew;Evans，Kenneth E.
超疏水材料通常受到自然界的启发，而超材料则被设计成具有通常不会自然发生的特性。在这两种情况下，其独特性质的关键是结构。在这里，它表明，负泊松比（拉胀）机械超材料可以转变成一个独特的超疏水材料。当被拉伸时，它的表面具有违反直觉的性质，即它也在正交的横向方向上膨胀。模拟了应变时固体表面分数的变化，结果表明，它随着拉胀晶格的固体元素之间的空间的扩大而减小。这导致超疏水性对应变的独特依赖性。实验模型的构建，以说明不同的应变状态和超疏水性之间的关系，作为晶格从拉胀过渡到一个传统的结构。这些发现为设计用于自清洁表面、液滴运输、液滴封装和油水分离的超疏水材料提供了一种新方法。
Superhydrophobic materials are often inspired by nature, whereas metamaterials are engineered to have properties not usually occurring naturally. In both, the key to their unique properties is structure. Here, it is shown that a negative Poisson's ratio (auxetic) mechanical metamaterial can transform into a unique superhydrophobic material. When stretched, its surface has the counterintuitive property that it also expands in the orthogonal lateral direction. The change in the solid surface fraction as strain is applied is modeled, and it is shown that it decreases as the space between solid elements of the auxetic lattice expands. This results in a unique dependence of the superhydrophobicity on strain. Experimental models are constructed to illustrate the relationship between different states of strain and superhydrophobicity as the lattice transitions from an auxetic to a conventional structure. The findings offer a new approach to designing superhydrophobic materials for self‐cleaning surfaces, droplet transportation, droplet encapsulation, and oil–water separation.