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Tunable Anisotropic Wettability of Rice Leaf-Like Wavy Surfaces

机译：水稻叶片状波浪形表面的可调各向异性润湿性

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摘要

Rice leaves can directionally shed water droplets along the longitudinal direction of the leaf. Inspired by the hierarchical structures of rice leaf surfaces, synthetic rice leaf-like wavy surfaces are fabricated that display a tunable anisotropic wettability by using electrostatic layer-by-layer assembly on anisotropic microwrinkled substrates. The nanoscale roughness of the rice leaf-like surfaces is controlled to yield tunable anisotropic wettability and hydrophobic properties that transitioned between the anisotropic/pinned, anisotropic/ rollable, and isotropic/rollable water droplet behavior states. These remarkable changes result from discontinuities in the three-phase (solid-liquid-gas) contact line due to the presence of air trapped beneath the liquid, which is controlled by the surface roughness of the hierarchical nanostructures. The mechanism underlying the directional water-rolling properties of the rice leaf-like surfaces provides insight into the development of a range of innovative applications that require control over directional flow.
机译：稻叶可以沿着叶的纵向定向滴落水滴。受到稻米叶片表面分层结构的启发，通过在各向异性微皱衬底上使用静电逐层组装，制造出了合成稻米叶片状波浪形表面，该表面显示出可调的各向异性润湿性。控制稻叶状表面的纳米级粗糙度，以产生可调节的各向异性润湿性和疏水特性，这些特性在各向异性/钉扎，各向异性/可滚动和各向同性/可滚动的水滴行为状态之间转变。这些显着变化是由于存在于液体下方的空气（由于分层纳米结构的表面粗糙度所控制）导致的三相（固-液-气）接触线的不连续而导致的。稻米叶状表面的定向水滚动特性的基本机制使人们深入了解了需要控制定向流动的一系列创新应用的发展。

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  • 来源
    《Advanced Functional Materials》 |2013年第5期|547-553|共7页
  • 作者

    Seung Goo Lee; Ho Sun Lim; Dong Yun Lee; Donghoon Kwak; Kilwon Cho;

  • 作者单位

    Department of Chemical Engineering Pohang University of Science and Technology Pohang, 790-784, Korea;

    Department of Chemical Engineering Pohang University of Science and Technology Pohang, 790-784, Korea;

    Department of Chemical Engineering Pohang University of Science and Technology Pohang, 790-784, Korea;

    Department of Chemical Engineering Pohang University of Science and Technology Pohang, 790-784, Korea;

    Department of Chemical Engineering Pohang University of Science and Technology Pohang, 790-784, Korea;

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