Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-Sen University, Guangzhou 510006, P. R. China.
State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, P. R. China.
ACS Appl Mater Interfaces. 2020 May 6;12(18):21080-21087. doi: 10.1021/acsami.0c02888. Epub 2020 Apr 23.
Achieving effective dropwise capture and ultrafast water transport is essential for fog harvesting. In nature, cactus uses the conical spine with microbarbs to effectively capture fog, while utilizes the trichome with hierarchical microchannels to quickly transport water. Herein, we combined their advantages to present a novel configuration, a spine with barbs and hierarchical channels (SBHC), for simultaneous ultrafast water transport and high-efficient fog harvesting. This bioinspired SBHC exhibited the fastest water transport ability and the highest fog harvesting efficiency in comparison with the spine with hierarchical channels (SHCs), the spine with barbs and grooves (SBG), and the spine with barbs (SB). Based on the fundamental SBHC unit, we further designed and fabricated a two-dimensional (2D) spider-web-like fog collector and a three-dimensional (3D) cactus-like fog collector using direct laser structuring and origami techniques. The 2D spider-web and 3D cactus-like fog collectors showed high-efficient fog collection capacity. We envision that this fundamental understanding and rational design strategy can be applied in fog harvesting, heat transfer, liquid manipulation, and microfluidics.
实现有效的逐滴捕获和超快的水输运对于雾水收集至关重要。在自然界中，仙人掌利用带有微刺的锥形刺来有效地捕获雾，而则利用具有分级微通道的刚毛来快速输运水。在此，我们结合了它们的优点，提出了一种新颖的结构，即带有刺和分级通道的刺（SBHC），用于同时实现超快的水输运和高效的雾水收集。与具有分级通道的刺（SHCs）、带有刺和凹槽的刺（SBG）和带有刺的刺（SB）相比，这种受生物启发的 SBHC 表现出最快的水输运能力和最高的雾水收集效率。基于基本的 SBHC 单元，我们进一步使用直接激光结构化和折纸技术设计和制造了二维（2D）蛛网式雾收集器和三维（3D）仙人掌式雾收集器。2D 蛛网和 3D 仙人掌式雾收集器表现出了高效的雾水收集能力。我们设想，这种基本的理解和合理的设计策略可以应用于雾水收集、传热、液体处理和微流控领域。
