There are many reports on the special wettability of hierarchical surface structures in nature. Snail shells with three types of roughness of 10, 100, and 500 µm have a unique wetting behavior. In the present study, we investigate the influence of the surface structure on the water wettability using snail shells with different surface roughness. The wettability of a water droplet on the samples was evaluated. The three types of roughness on the surface structure of snail shell had higher water droplet spreading properties than the two types of roughness 500 µm and, 10 or 100 µm. Surface structures of snail shells with different surface roughness were simulated using epoxy resins to clarify the mechanism for the dynamics wetting behavior. The contact angle with a hydrophobic nature, of the epoxy resin with the three types of roughness decreased with increasing time, indicating a hydrophilic nature. The base diameter of the epoxy resins with the three types of roughness increased with increasing time. This was larger than that for a flat epoxy resin with hydrophilicity. Other epoxy resins with shell texture containing 100 and 500 or 10 and 500 µm roughness showed almost no change in the contact angle and diameter of the droplet base. The three types of roughness on the sample surface contributed to development of the water droplet spreading. The 10 µm roughness of the sample surface influenced the dynamic contact angles.

中文翻译：

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水的润湿性取决于蜗牛壳的表面结构。

关于自然界中分层表面结构的特殊润湿性的报道很多。三种粗糙度分别为10、100和500 µm的蜗牛壳具有独特的润湿性能。在本研究中，我们使用具有不同表面粗糙度的蜗牛壳研究表面结构对水润湿性的影响。评价了水滴在样品上的润湿性。蜗牛壳表面结构上的三种粗糙度具有比500μm和10或100μm两种粗糙度更高的水滴散布特性。用环氧树脂模拟了蜗牛壳不同表面粗糙度的表面结构，阐明了动力学润湿行为的机理。具有疏水性的接触角，三种粗糙度的环氧树脂的粘度随时间的增加而降低，表明其亲水性。具有三种粗糙度的环氧树脂的基本直径随时间的增加而增加。这比具有亲水性的扁平环氧树脂大。其他具有100和500或10和500 µm粗糙度的外壳纹理的环氧树脂几乎没有改变液滴基体的接触角和直径。样品表面上的三种粗糙度有助于水滴散布的发展。样品表面的10 µm粗糙度会影响动态接触角。这比具有亲水性的扁平环氧树脂大。壳纹理为100和500或粗糙度为10和500 µm的其他环氧树脂，其液滴基的接触角和直径几乎没有变化。样品表面上的三种粗糙度有助于水滴散布的发展。样品表面的10 µm粗糙度会影响动态接触角。这比具有亲水性的扁平环氧树脂大。其他具有100和500或10和500 µm粗糙度的外壳纹理的环氧树脂几乎没有改变液滴基体的接触角和直径。样品表面上的三种粗糙度有助于水滴散布的发展。样品表面的10 µm粗糙度会影响动态接触角。