Liquid harvesting and transport on multiscaled curvatures.
Liquid harvesting and transport on multiscaled curvatures.
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多尺度曲率上的液体采集和传输
DOI：
10.1073/pnas.2011935117
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发表时间：
2020-09-22
影响因子：
11.1
通讯作者：
Jiang L
中科院分区：
文献类型：
--
作者：
Li C;Yu C;Zhou S;Dong Z;Jiang L
虽然不同的生物具有不同的结构梯度来从雾中收集水，例如蜘蛛丝和仙人掌簇，但它们的梯度表面只能在有限的水滴大小的距离内驱动收集的水滴运动，并且速度较慢，限制了实际应用。猪笼草的口唇是一种上级的捕雾器，它利用棘轮、锯齿和拱形结构的组合效果，从潮湿的空气中收集水，并以记录的速度沿弯曲的口唇沿着定向地输送冷凝水。仿生方法将这种多尺度曲率设计应用于水雾和有机蒸汽收集器的构建，使其成为广泛应用的通用解决方案。各种生物，如蜘蛛丝和仙人掌，已经利用它们的表面结构来收集雾气以生存。这些表面通常保持干燥并具有较大的接触滞后，使它们能够移动冷凝的水滴，从而导致间歇性的传输状态和相对降低的速度。与这些生物相反，在这里，我们证明了猪笼草阿拉塔提供了一个显着的集成系统在其口部表面连续收获水在潮湿的环境中。多曲率结构安装在孔口上，以连续地收集和输送水，分三个步骤：液滴在棘轮齿上成核，水收集的自泵送通过棘轮稳定地增加，以及将所获得的水输送到溢流孔口的整个拱形通道。水润湿的口部表面可进一步提高水的运输速度约300倍。仿生设计将水和有机烟雾的收集应用领域扩展到蒸发塔、实验室、厨房和化工行业。
Significance Although various creatures possess different structural gradients to gather water from fog, such as spider silk and cactus cluster, their gradient surfaces can only drive the motion of harvested water droplets over only a limited drop-sized distance and afford a slow speed, limiting the practical usage. The peristome of the pitcher plant presented here is a superior fog harvestor that capitalizes on the combined effects of ratchet, concavity, and arch structures to collect water from humid air and transport condensate water directionally along the curved peristome at a recording speed. Biomimetic approaches apply this multiscaled curvatures design to the construction of water fog and organic vapor harvestor, making it a versatile solution for a broad range of applications. Various creatures, such as spider silk and cacti, have harnessed their surface structures to collect fog for survival. These surfaces typically stay dry and have a large contact hysteresis enabling them to move a condensed water droplet, resulting in an intermittent transport state and a relatively reduced speed. In contrast to these creatures, here we demonstrate that Nepenthes alata offers a remarkably integrated system on its peristome surface to harvest water continuously in a humid environment. Multicurvature structures are equipped on the peristome to collect and transport water continuously in three steps: nucleation of droplets on the ratchet teeth, self-pumping of water collection that steadily increases by the concavity, and transport of the acquired water to overflow the whole arch channel of the peristome. The water-wetted peristome surface can further enhance the water transport speed by ∼300 times. The biomimetic design expands the application fields in water and organic fogs gathering to the evaporation tower, laboratory, kitchen, and chemical industry.
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