Superhydrophobicity of Auxetic Metamaterials
Superhydrophobicity of Auxetic Metamaterials
Superhydrophobic materials are often inspired by nature, whereas metamaterials are engineered to have properties not usually found in naturally occurring materials. In both cases, the key that unlocks their unique properties is structure. Here, we show that a negative Poisson's ratio (auxetic) mechanical metamaterial is capable of transforming into a unique type of superhydrophobic material. When stretched its surface has the counterintuitive property that it also expands in the orthogonal lateral direction. We model the change in the solid surface fraction as strain is applied and show it decreases as the space between solid elements of the auxetic lattice expands. This results in a unique dependence of the superhydrophobicity on strain. We construct experimental models illustrating the relationship between different states of strain and superhydrophobicity as the lattice structure transitions from an auxetic to a conventional (positive Poisson's ratio) one. The principles we have discovered offer a new approach to designing superhydrophobic materials for self-cleaning surfaces, droplet transportation, droplet encapsulation and oil-water separation.
Rodrigo Ledesma-Aguilar、Glen McHale、Mahya Meyari、Gary G. Wells、Kenneth E. Evans、Emma Carter、Ciro Semprebon、Shruti Mandhani、Steven Armstrong、Andrew Alderson
Wetting, Interfacial Science & Engineering Laboratory, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh, UKWetting, Interfacial Science & Engineering Laboratory, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh, UKWetting, Interfacial Science & Engineering Laboratory, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh, UKWetting, Interfacial Science & Engineering Laboratory, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh, UKDepartment of Engineering, University of Exeter, Exeter, UKMaterials & Engineering Research Institute, Sheffield Hallam University, Sheffield, UKSmart Materials & Surfaces Laboratory, Faculty of Engineering & Environment, Northumbria University, Newcastle upon Tyne, UKMaterials & Engineering Research Institute, Sheffield Hallam University, Sheffield, UKWetting, Interfacial Science & Engineering Laboratory, Institute for Multiscale Thermofluids, The University of Edinburgh, Edinburgh, UKMaterials & Engineering Research Institute, Sheffield Hallam University, Sheffield, UK
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Rodrigo Ledesma-Aguilar,Glen McHale,Mahya Meyari,Gary G. Wells,Kenneth E. Evans,Emma Carter,Ciro Semprebon,Shruti Mandhani,Steven Armstrong,Andrew Alderson.Superhydrophobicity of Auxetic Metamaterials[EB/OL].(2023-06-05)[2025-08-10].https://arxiv.org/abs/2306.02916.点此复制
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