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A Micro/nano Structural Model for Wettability of Moth Wing Surface

机译:一种微/纳米结构模型,用于蛾翼表面的润湿性

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The micro-morphology, wettability and chemical composition of the moth wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle (CA) meter and a Fourier transform infrared spectrometer (FT-IR). The micro-morphological models for hydrophobicity on the wing surface were established on the basis of the Cassie-Baxter equation. The wetting mechanism was discussed from the perspective of biological coupling. The moth wing surfaces are composed of naturally hydrophobic material and display micro/nano hierarchical structures, including primary structure (micrometric scales), secondary structure (submicro longitudinal ridges and lateral bridges) and tertiary structure (nano stripes). The wing surfaces exhibit high hydrophobicity (CA 150~156°) and low adhesion (sliding angle 1~4°). The cooperative effect of material element and structural element contributes to the special wettability of the wing surface. In micro-dimension, the smaller the width and the bigger the spacing of the scale, the stronger the hydrophobicity of the wing surfaces. In nano-dimension, the smaller the height and the smaller the width and the bigger the spacing of the longitudinal ridge, the stronger the hydrophobicity of the wing surfaces. The micro/nano structural model provides CA predictions in good accord with the data measured. The result may bring inspiration for biomimetic design and preparation of smart interfacial materials and novel self-cleaning coatings.
机译:通过扫描电子显微镜(SEM),接触角(CA)计和傅里叶变换红外光谱仪(FT-IR)研究了蛾翼表面的微观形态,润湿性和化学成分。基于Cassie-Baxter方程建立了机翼表面疏水性的微形态模型。从生物偶联的角度讨论了润湿机制。蛾翼表面由天然疏水材料和显示微/纳米层次结构组成,包括初级结构(微米尺度),二次结构(亚亚微米纵向脊和侧桥)和三级结构(纳米条纹)。翼表面表现出高疏水性(Ca150〜156°)和低粘附力(滑动角度1〜4°)。材料元素和结构元素的协同​​效果有助于机翼表面的特殊润湿性。在微尺寸下,宽度越小,比例的间距越大,翼面的疏水性越强。在纳米尺寸下,宽度越小,纵向脊的间距越小,翼面的疏水性越强。微/纳米结构模型以良好的符合测量的数据提供CA预测。结果可能为仿生设计和智能界面材料和新型自清洁涂料的制备带来灵感。

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