Controlling Directional Liquid Transport on Dual Cylindrical Fibers with Oriented Open‐Wedges
Controlling Directional Liquid Transport on Dual Cylindrical Fibers with Oriented Open‐Wedges
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使用定向开口楔块控制双圆柱形纤维上的定向液体传输
DOI：
10.1002/admi.202101749
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发表时间：
2021-12
影响因子：
5.4
通讯作者：
Huan Liu
中科院分区：
文献类型：
--
作者：
Qing’an Meng;Bojie Xu;Zhongxue Tang;Yan Wei;Lei Jiang;Huan Liu
纤维系统的定向液体传输作为一种重要的传质策略在自然生物和实际应用中都得到了广泛的应用。到目前为止，纤维上的dlt在很大程度上依赖于能够产生拉普拉斯压差的锥形结构。对于圆柱形纤维，液体只能在纤维间毛细力的驱动下沿轴的两个方向均匀输送，而在方向上很难进行可控的输送。在这里，作者揭示了双圆柱形毛发具有DLT的能力，这是由于湿重建的开楔鳞片。沿楔角的毛细力促进了液体沿反垢方向的输送，而开口楔尖边缘的钉住效应与棘轮结构赋予的各向异性保持力协同作用，抑制了液体沿顺垢方向的扩散。因此，液体倾向于在双圆柱形毛上沿反鳞片方向运输。在此基础上，作者建立了具有DLT特性的双圆柱形光纤的概念模型，并且根据楔形的开口角度可以很好地控制不同整流比的DLT。该结果为使用圆柱形纤维系统操纵液体提供了新的见解。
Directional liquid transport (DLT) on fibrous systems has been widely used in both natural organisms and practical applications as an important mass transfer strategy. So far, DLTs on fibers are heavily dependent on the conical structure that enables generating the Laplace pressure difference. For the cylindrical fibers, liquid can only transport evenly along both directions of the axis driven by the capillary forces between fibers, which however hardly proceeds directionally in a controllable way. Here, the authors revealed that the dual cylindrical hairs bear the ability of DLT, which is attributable to the wet‐rebuilt open‐wedged scales. Capillary forces along wedge corners facilitate the liquid transport in the against‐scale direction, while the pinning effect at the sharp edges of open‐wedges works cooperatively with the anisotropic retention force imparted by the ratchet structures to inhibit liquid spreading in the with‐scale direction. Consequently, liquid prefers to transport in the against‐scale direction on dual cylindrical hairs. Drawing inspirations, the authors develop the conceptual‐model of dual cylindrical fibers that is capable of DLT, and moreover the DLT with different rectification ratios can be well‐controlled depending on the opening angle of wedges. The result offers new insights for manipulating liquid using cylindrical fibrous systems.
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