Directional shedding-off of water on natural/bio-mimetic taper-ratchet array surfaces
Directional shedding-off of water on natural/bio-mimetic taper-ratchet array surfaces
复制标题
天然/仿生锥形棘轮阵列表面上的定向排水
DOI：
10.1039/c1sm06631e
复制
发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Jiang, Lei
中科院分区：
文献类型：
--
作者：
Guo, Peng;Zheng, Yongmei;Jiang, Lei
控制液体的表面在自清洁、液体运输和细胞导向方面很重要。它们在通过微/纳米结构控制润湿性和粘附性的生物表面上被显著地观察到，并且引起了基础和仿生研究的兴趣。在这里，我们报告了一种新的锥形棘齿阵列的黑麦草叶片。它集成了固液界面处相反方向的保留梯度，以可逆地产生固液接触线的释放或钉扎，并因此实现有效的定向水脱落特性。通过模仿黑麦草叶片的锥形棘齿，成功地制备了聚合物表面。它们显示出强大的定向排水性能。当在聚合物表面上执行外部振动时，液滴实现沿锥形棘轮尖端的定向方向的单向自脱落沿着，因为在相反的定向方向上形成不对称的保持力。这一研究将有助于设计一种新型的流体控制表面，可以扩展到应用，如自清洁，液体传输和细胞导向的项目。
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.