Abstract:
:The ability to control drops and their movements on phobic surfaces is important in printing or patterning, microfluidic devices, and water-repellent materials. These materials are always micro-/nanotextured, and a natural limitation of repellency occurs when drops are small enough (as in a dew) to get trapped in the texture. This leads to sticky Wenzel states and destroys the superhydrophobicity of the material. Here, we show that droplets of volume ranging from femtoliter (fL) to microliter (μL) can be self-removed from the legs of water striders. These legs consist of arrays of inclined tapered setae decorated by quasi-helical nanogrooves. The different characteristics of this unique texture are successively exploited as water condenses, starting from self-penetration and sweeping effect along individual cones, to elastic expulsion between flexible setae, followed by removal at the anisotropic leg surface. We envision that this antifogging effect at a very small scale could inspire the design of novel applicable robust water-repellent materials for many practical applications.
journal_name
Proc Natl Acad Sci U S Aauthors
Wang Q,Yao X,Liu H,Quéré D,Jiang Ldoi
10.1073/pnas.1506874112subject
Has Abstractpub_date
2015-07-28 00:00:00pages
9247-52issue
30eissn
0027-8424issn
1091-6490pii
1506874112journal_volume
112pub_type
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