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Superhydrophilic–Superhydrophobic Water Harvester Inspired by Wetting Property of Cactus Stem
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-05-16 00:00:00 , DOI: 10.1021/acssuschemeng.9b01113 Sang Joon Lee 1 , Nami Ha 1 , Hyejeong Kim 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-05-16 00:00:00 , DOI: 10.1021/acssuschemeng.9b01113 Sang Joon Lee 1 , Nami Ha 1 , Hyejeong Kim 2
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Water harvesting is a core technology for collecting fresh water in arid areas. In this study, we design a three-dimensional cactus stem-inspired water harvesting system (WHS) with directional transport of absorbed fog. The bioinspired WHS consists of two distinct functions. One is an effective water-absorbing function with an antievaporating feature, and the other is an on-demand water-releasing function. The excellent water absorption capability of a mucilage-filled cactus stem covered with a cuticle is mimicked by a cylindrical double structural system (DS) comprising an interpenetrating polymer network (IPN) hydrogel with good water retention capacity and a superhydrophobic copper mesh (SHPM) that prevents the re-evaporation of absorbed water. DS harvests water at a rate of 209 mg cm–2 h–1 and exhibits enhanced water collecting performance, i.e., 1.2, 1.3, and 2 times higher than that of the superhydrophilic IPN hydrogel, SHPM, and pristine copper mesh (PTM), respectively. The detailed fog harvesting mechanism of DS is examined through an X-ray imaging technique, and the water harvesting mechanism is described in terms of volumetric expansion of IPN hydrogel, absorption of microdroplets on mesh humps, and thickness of the water-film between mesh fibers. In addition, the function of water release is demonstrated with the aid of the thermoresponsive property of the IPN hydrogel. This biomimetic WHS may aid in developing effective three-dimensional plant-inspired fog collectors.
中文翻译：
仙人掌茎的润湿特性启发了超亲水-超疏水集水器
集水是干旱地区收集淡水的一项核心技术。在这项研究中，我们设计了一个三维仙人掌茎启发式集水系统（WHS），其吸收雾的定向传输。受生物启发的WHS包含两个不同的功能。一种是具有防蒸发功能的有效吸水功能，另一种是按需释放水的功能。圆柱状双层结构系统（DS）模仿了由表皮覆盖的黏液填充的仙人掌茎的出色吸水能力，该结构包括具有良好保水能力的互穿聚合物网络（IPN）水凝胶和超疏水铜网（SHPM），防止吸收的水重新蒸发。DS收获水的速率为209 mg cm –2 h –1并具有增强的集水性能，即分别比超亲水IPN水凝胶，SHPM和原始铜网（PTM）的集水性能高1.2倍，1.3倍和2倍。通过X射线成像技术检查DS的详细雾气收集机理，并根据IPN水凝胶的体积膨胀，网状峰上微滴的吸收以及网状纤维之间的水膜厚度来描述水收集机理。 。此外，借助IPN水凝胶的热响应特性证明了水的释放功能。这种仿生WHS可能有助于开发有效的三维植物启发式除雾器。
更新日期：2019-05-16
中文翻译：
仙人掌茎的润湿特性启发了超亲水-超疏水集水器
集水是干旱地区收集淡水的一项核心技术。在这项研究中，我们设计了一个三维仙人掌茎启发式集水系统（WHS），其吸收雾的定向传输。受生物启发的WHS包含两个不同的功能。一种是具有防蒸发功能的有效吸水功能，另一种是按需释放水的功能。圆柱状双层结构系统（DS）模仿了由表皮覆盖的黏液填充的仙人掌茎的出色吸水能力，该结构包括具有良好保水能力的互穿聚合物网络（IPN）水凝胶和超疏水铜网（SHPM），防止吸收的水重新蒸发。DS收获水的速率为209 mg cm –2 h –1并具有增强的集水性能，即分别比超亲水IPN水凝胶，SHPM和原始铜网（PTM）的集水性能高1.2倍，1.3倍和2倍。通过X射线成像技术检查DS的详细雾气收集机理，并根据IPN水凝胶的体积膨胀，网状峰上微滴的吸收以及网状纤维之间的水膜厚度来描述水收集机理。 。此外，借助IPN水凝胶的热响应特性证明了水的释放功能。这种仿生WHS可能有助于开发有效的三维植物启发式除雾器。
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