Directional shedding-off of water on natural/bio-mimetic taper-ratchet array surfaces

Peng Guo, Yongmei Zheng, Chengcheng Liu, Jie Ju, Lei Jiang

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46 Citations (Scopus)


Surfaces that control fluids are important in self-cleaning, liquid-transport and cell-directing. They are significantly observed on biological surfaces that control wettability and adhesion by means of micro-/nanostructures, and have aroused interest in foundational and biomimetic research. Here, we report a novel taper-ratchet array on ryegrass leaf. It integrates a gradient of retention at solid-liquid interfaces in contrasting directions to reversibly generate the release or the pinning of solid-liquid contact lines, and accordingly, achieves effective directional water shedding-off properties. By mimicking taper-ratchets from ryegrass leaf, the polymer surfaces are fabricated successfully. They display a robust property of directional water shedding-off. When external vibrations are executed on polymer surfaces, the drops achieve a unidirectional self-shedding along the oriented direction of tips of taper-ratchets, because asymmetric retention forces are formed in the contrasting oriented directions. This investigation will be helpful to design a novel fluid-controlling surface that can be extended to applications such as self-cleaning, liquid-transport and cell-directed projects.

Original languageEnglish
Pages (from-to)1770-1775
Number of pages6
JournalSoft Matter
Issue number6
Publication statusPublished - 14 Feb 2012
Externally publishedYes

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