Gladiolus dalenii Based Bioinspired Structured Surface via Soft Lithography and Its Application in Water Vapor Condensation and Fog Harvesting
Gladiolus dalenii Based Bioinspired Structured Surface via Soft Lithography and Its Application in Water Vapor Condensation and Fog Harvesting
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DOI：
10.1021/acssuschemeng.8b00815
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发表时间：
2018-05-01
影响因子：
8.4
通讯作者：
Harish, Sivasankaran
中科院分区：
文献类型：
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作者：
Sharma, Vipul;Orejon, Daniel;Harish, Sivasankaran
通过非均匀冷凝和雾收集收集水在日常生活和几个工业应用中具有重要意义。近年来，自然界和生物物种所表现出的独特的表面形态和润湿性的组合越来越受到科学界的关注。这些物种的表面形态表现出独特的微观和纳米结构的安排，发挥了至关重要的作用，在水蒸气冷凝和雾收获。在这项工作中，我们专注于设计和复制的生物启发表面唐菖蒲（G。Dalenii），使用廉价、容易和可扩展的软光刻制造技术。使用扫描电子显微镜和3D激光光学显微镜的微观和纳米结构表面复制的程度进行评估。此外，我们还比较了G. dalenii叶和它的仿生复制品在液滴冷凝过程中在微尺度上使用环境扫描电子显微镜和光学显微镜，以及它的雾收获行为。液滴成核和生长的详细研究和相关的独特的表面微观和纳米结构，在这样的表面上的层次结构的方式安排相比，光滑的对照样品。此外，还研究了固定化和重复化G. dalenii以及光滑对照样品上的表面能分析进行了比较和证明。最后，利用G. Dalenii表面形态，该工作成功地证明了与平坦配置相比，使用软光刻制造的生物启发功能表面的优异的冷凝传热和雾收集行为。此外，我们还展示了近准确的复制的微表面结构和冷凝和雾收获背后的管理机制。
Water collection via heterogeneous condensation and fog harvesting has important implications in everyday life and in several industrial applications. Recently, the unique combination of surface morphology and wettability exhibited by natural and biological species is receiving increasing attention from the scientific community. Surface morphology of such species exhibits unique micro- and nanostructure arrangements, which play a paramount role in water vapor condensation and fog harvesting. In this work, we focus on the design and replication of the bioinspired surface Gladiolus dalenii (G. dalenii) using inexpensive, facile and scalable soft lithography fabrication technique. The extent of micro- and nanostructure surface replication is evaluated using scanning electron microscopy and 3D laser optical microscopy. In addition, we compare the performance of G. dalenii leaf and its bioinspired replica during droplet condensation at the microscale using environmental scanning electron microscopy and optical microscopy and also its fog harvesting behavior. Droplet nucleation and growth is investigated in detail and correlated with the unique surface micro- and nanostructures arranged in a hierarchical manner on such surfaces when compared to smooth control sample. In addition, the different water collection performance on fixated and on replicated G. dalenii, as well as on the smooth control sample is compared and demonstrated by the surface energy analysis proposed. To conclude, by taking advantage of the unique G. dalenii surface morphology, this work successfully demonstrates the excellent condensation heat transfer and fog harvesting behavior of bioinspired functional surfaces fabricated using soft lithography when compared to the flat configuration. In addition, we also demonstrate the near-accurate replication of the microsurface structures and of the governing mechanisms behind condensation and fog harvesting.