Wetting transitions on superhydrophobic auxetic metamaterials
Wetting transitions on superhydrophobic auxetic metamaterials
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DOI：
10.1063/5.0173464
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发表时间：
2023-10
影响因子：
4
通讯作者：
S. Armstrong;G. McHale;Andrew Alderson;Shruti Mandhani;Mahya Meyari;Gary Wells;Emma Carter;R. Ledesma‐Aguilar;C. Semprebon
中科院分区：
文献类型：
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作者：
S. Armstrong;G. McHale;Andrew Alderson;Shruti Mandhani;Mahya Meyari;Gary Wells;Emma Carter;R. Ledesma‐Aguilar;C. Semprebon
超疏水性在许多应用中起着关键作用。最近，我们已经证明了拉胀超材料在创造具有独特润湿性能的超疏水材料方面的潜力。然而，当液体渗透到表面结构中时，超疏水特性丧失。了解液滴渗透的条件对于推进润湿控制至关重要。在这里，我们通过实验确定从液滴悬浮到完全渗透的拉胀蝴蝶结/蜂窝晶格膜的过渡。我们开发了一个全面的物理模型表面代表不同的应变状态，从拉胀到传统的晶格膜，并考虑润湿的液体表面张力是不同的使用水/乙醇混合物。通过研究接触角和晶格结构之间的相互作用，我们对液滴悬浮和完全渗透的条件获得了有价值的见解。此外，我们开发了一个简单的触摸测试，以辨别液滴是否有效地完全渗透的结构，提供了一个实用和有效的手段区分不同的润湿状态（悬浮或部分渗透与完全渗透）。
Superhydrophobicity plays a pivotal role in numerous applications. Recently, we have demonstrated the potential of auxetic metamaterials in creating superhydrophobic materials with unique wetting properties. However, the superhydrophobic properties are lost when the liquid penetrates into the surface structure. Understanding the conditions for droplet penetration is crucial for advancing wetting control. Here, we experimentally identify the transition from droplet suspension to full-penetration on an auxetic bowtie/honeycomb lattice membrane. We develop a comprehensive physical model surface representing different states of strain, ranging from auxetic to conventional lattice membranes, and consider the wetting as the liquid surface tension is varied using water/ethanol mixtures. By examining the interplay between contact angle and lattice structure, we gain valuable insights into the conditions for droplet suspension and full-penetration. Additionally, we develop a simple touch test to discern whether a droplet has effectively fully penetrated the structure, providing a practical and efficient means of distinguishing the different wetting states (suspended or partially penetrating vs fully penetrating).