Bioinspired Nanofibril-Humped Fibers with Strong Capillary Channels for Fog Capture
Bioinspired Nanofibril-Humped Fibers with Strong Capillary Channels for Fog Capture
复制标题
具有强大毛细管通道的仿生纳米原纤维驼峰纤维，用于捕获雾气
DOI：
10.1021/acsami.0c06945
复制
发表时间：
2020
影响因子：
9.5
通讯作者：
Zheng Yongmei
中科院分区：
文献类型：
--
作者：
Liu Yufang;Yang Nan;Gao Chunlei;Li Xin;Guo Zhenyu;Hou Yongping;Zheng Yongmei
利用热塑性聚酯弹性体和壳聚糖制备了仿生纳米驼峰纤维，将静电纺丝技术和流体包覆法相结合，获得了与润湿蜘蛛丝微/纳米结构高度相似的周期性驼峰，其结构由相互交织的无规纳米纤维和由排列的纳米纤维组成的接头组成。特别是，纳米纤维可以增加驼峰的比表面积，有效地捕获雾滴，并在潮湿条件下在纳米纤维之间的通道中传输水分，从而使雾滴能够聚集在一起，高效地向驼峰定向输送集水。这种高效的雾捕获能力归功于BNFS外壳内的高效运输和外部运输的共同作用。纳米纤维之间的各向异性毛细管通道诱导了纳米纤维的内部传输。当BNFS被润湿时，由于纳米纤维之间的各向异性毛细通道的诱导，水的内部传输方式占主导地位。利用BNF纤维网研究了雾捕集过程中不同纤维接触方式下的液滴传输情况。这项研究为新材料的设计提供了一个洞察力，预计将为一些应用领域开发，如集雾工程、过滤等。
Bioinspired nanofibril-humped fibers (BNFs) are fabricated by using thermoplastic polyester elastomer and chitosan, via combining the electrospinning technique and fluid coating method to achieve periodic humps composed of interlaced random nanofibrils and a joint composed of aligned nanofibrils, which are highly similar to the micro/nanostructures of wetted spider silk. Especially, nanofibrils can increase the specific area of the hump to capture fog droplets effectively and transport water in channels between the nanofibrils under humid conditions, and thus the fog droplets can coalesce and be highly efficiently transported toward humps for water collection directionally. Such an ability of highly efficient fog capture is attributed to cooperation of an efficient transportation inside the outer shell of BNFs and outside transportation. Inside transportation is induced by anisotropic capillary channels between nanofibrils. When BNFs are wetted, the inside transportation mode is dominated for water collection, induced by anisotropic capillary channels between nanofibrils. BNF web is also used to investigate the droplet transportation in different cross-fiber contact modes in the process of fog capture on a large scale. This study offers an insight into the design of novel materials, which is expected to be developed for some realms of applications, such as fog harvesting engineering, filtration, and others.