毛状表面的超疏水性
Superhydrophobicity on hairy surfaces
摘要：
我们研究了具有细弹性毛发图案的表面的润湿特性，重点是识别亲水毛发上的超疏水状态。我们制定了一个二维模型的一个大的下降接触一排等间距的弹性头发，并通过最小化模型的自由能，确定稳定和亚稳态。特别是我们集中在“部分悬挂”状态，其中的头发弯曲，以支持下降-单线态，所有的头发弯曲在同一方向，和双峰状态，相邻的头发弯曲在相反的方向-并找到这些配置的材料接触角，头发的灵活性，和系统的几何形状方面的稳定性的限制。在亲水性接触角下，液滴可以保持悬浮在单线态，但只有当毛发是疏水性的时，才存在双线态。如果头发在根部倾斜，系统更有可能演化成单线态。我们讨论如何，在有限的情况下，可以修改的结果来描述一个阵列的头发在三维空间。我们发现，现在单重态和二重态都可以在亲水性毛发上表现出超疏水行为。我们讨论了我们的方法的局限性和未来的工作方向。
英文摘要：
We investigate the wetting properties of surfaces patterned with fine elastic hairs, with an emphasis on identifying superhydrophobic states on hydrophilic hairs. We formulate a two dimensional model of a large drop in contact with a row of equispaced elastic hairs and, by minimising the free energy of the model, identify the stable and metastable states. In particular we concentrate on "partially suspended" states, where the hairs bend to support the drop -- singlet states where all hairs bend in the same direction, and doublet states where neighbouring hairs bend in opposite directions -- and find the limits of stability of these configurations in terms of material contact angle, hair flexibility, and system geometry. The drop can remain suspended in a singlet state at hydrophilic contact angles, but doublets exist only when the hairs are hydrophobic. The system is more likely to evolve into a singlet state if the hairs are inclined at the root. We discuss how, under limited circumstances, the results can be modified to describe an array of hairs in three dimensions. We find that now both singlets and doublets can exhibit superhydrophobic behaviour on hydrophilic hairs. We discuss the limitations of our approach and the directions for future work.
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