Fog Harvesting of a Bioinspired Nanocone-Decorated 3D Fiber Network
Fog Harvesting of a Bioinspired Nanocone-Decorated 3D Fiber Network
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仿生纳米锥装饰 3D 光纤网络的雾气收集
DOI：
10.1021/acsami.8b15901
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发表时间：
2019-01-30
影响因子：
9.5
通讯作者：
Zheng, Yongmei
中科院分区：
文献类型：
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作者：
Li, Chang;Liu, Yufang;Zheng, Yongmei
仿生纳米锥修饰的三维纤维网络（N3 D）可以被制造，其中原始的3D网被设计，受到蜘蛛网的一些最新研究结果的启发，并且它被以仙人掌刺为灵感的亲水性氧化锌（ZnO）纳米锥修饰。纤维上的多层次高比表面积暴露以及亲水装饰使其对水分子更具吸引力。这些纳米锥可以捕获雾滴，产生聚结液滴，并因此使液滴传输效率由于拉普拉斯压力差。特别地，一种新的机制揭示了在纳米锥修饰的纤维被润湿之后，即，由于与瑞利不稳定性相关的力，水膜形成并立即破碎成液滴。连续下滞留面实现了快速连续水流的形成，而不是传统的间歇过程。因此，在N3 D上实现了出色的雾收集效率，例如，可能达到865.1 kg/m2/天，其中在2小时内收集的水的质量可以比没有纳米锥的原始3D网的重量提高240倍以上。这种生物启发的ZnO纳米锥装饰的3D纤维网络（即，N3 D）具有潜在的应用，用于收集雾水用于生产或生活，例如冷却水塔和农业灌溉系统中的水再冷凝，甚至在缺水国家。
The bioinspired nanocone-decorated three-dimensional fiber network (N3D) can be fabricated, where an original 3D web is designed, inspired by some newest research findings of spider web, and it is decorated with hydrophilic zinc oxide (ZnO) nanocones inspired by cactus spine. Multilevel high specific surface area exposure on fiber together with the hydrophilic decoration enables it to be more attractive to water molecules. These nanocones can capture fog droplet, generate coalesced droplet, and accordingly make droplet transport efficient because of Laplace pressure difference. Especially, a novel mechanism revealed that after the nanocone-decorated fiber was wetted, that is, a water film formed and immediately broke up into droplets, owing to the force relating to Rayleigh instability. Consequent lower retention surface realizes the formation of fast continuous water flow, rather than the traditional intermittent course. Thus, outstanding fog-harvesting efficiency was achieved on N3D, for example, probably reaching 865.1 kg/m(2)/day, where the mass of collected water within 2 h can raise up to over 240 times higher than the weight of an original 3D web without nanocones. Such a bioinspired ZnO nanocone-decorated 3D fiber network (i.e., N3D) has potential application to harvest fog water for production or living, for example, water recondensation in cooling water towers and in agricultural irrigation systems, even in water-deficient countries.