Cactus-Inspired Janus Membrane with a Conical Array of Wettability Gradient for Efficient Fog Collection.
Cactus-Inspired Janus Membrane with a Conical Array of Wettability Gradient for Efficient Fog Collection.
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DOI：
10.1021/acs.langmuir.1c02368
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发表时间：
2021-11
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影响因子：
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通讯作者：
Yunyun Song;Zhao-Peng Yu;Li-Ming Dong;Mao-Lin Zhu;Zhi-Chun Ye;Yuan-Ji Shi;Yan Liu
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作者：
Yunyun Song;Zhao-Peng Yu;Li-Ming Dong;Mao-Lin Zhu;Zhi-Chun Ye;Yuan-Ji Shi;Yan Liu
集雾在缓解全球水资源短缺方面发挥着重要作用。尽管仿生集雾表面的研究取得了很大进展，但水滴仍会附着在微尺度亲水区域，并在下落前达到热力学稳定状态，从而延迟了水的传输，阻碍了连续集雾。受荷叶和仙人掌的启发，我们设计了一种Janus膜，其功能是从空气中收集雾并将其输送到特定区域。具有相反润湿性的Janus膜包含具有润湿性梯度和亲水性铜网表面的锥形微柱。锥形微柱的顶部具有超疏水性，其余部分具有疏水性。雾滴沉积，聚结，并定向输送到锥形微柱的底部。然后，液滴单向穿过膜并流入铜网表面的水膜中。不对称的结构和润湿性优点赋予Janus膜以107.05 g/cm 2/h的改进的雾收集。该研究对设计和开发雾收集、液体操作和微流控等领域的流体控制设备具有一定的参考价值。
Fog collection plays an important role in alleviating the global water shortage. Despite great progress in creating bionic surfaces to collect fog, water droplets still could adhere to the microscale hydrophilic region and reach the thermodynamic stable state before falling, which delays the transport of water and hinders the continuous fog collection. Inspired by lotus leaves and cactuses, we designed a Janus membrane that functions to both collect fog from the air and transport it to a certain region. The Janus membrane with opposite wettability contains conical microcolumns with a wettability gradient and hydrophilic copper mesh surface. The apexes of conical microcolumns are superhydrophobic and the rest are hydrophobic. The fog droplets were deposited, coalesced, and directionally transported to the bottom of the conical microcolumns. Then, the droplets unidirectionally passed through the membrane and flowed into the water film on the surface of the copper mesh. The asymmetric structural and wettability merits endow the Janus membrane with an improved fog collection of ∼7.05 g/cm2/h. The study is valuable for designing and developing fluid control equipment in fog collection, liquid manipulation, and microfluidics.