Origami-like 3D Fog Water Harvestor with Hybrid Wettability for Efficient Fog Harvesting

Abstract

Collecting water in fog has also become a breakthrough to solve the hidden danger of water shortage in some arid areas. The three-dimensional (3D) structure fog collection material can increase the surface area in direct contact with the fog flow and reduce the quick flow of fog, which can effectively improve the fog collection efficiency. Imitating the three-dimensional structure of corrugated paper, the 3D fog collecting material with hybrid wettability was prepared by chemical and physical means. We discuss the influence of different wettability combinations on the fog collection efficiency of 3D structures and study the influence of spraying times and illumination times on the surface wettability during the construction of wettability. We also study the influence of the concavity and tip as well as the bending angle on the fog collection in the 3D structure and obtain the most reasonable concavity and convex ratio and bending angle. The superhydrophilic and superhydrophobic 3D structure fog harvesting material prepared by us performs well in the fog harvesting process, and the fog harvesting efficiency reaches 1.442 g cm −2 h −1 . The fog collection efficiency is 418% of the original zinc sheet. At the same time, compared with the superhydrophilic and superhydrophobic hybrid twodimensional (2D) plane, the increase is 168%, and compared with the superhydrophobic 3D structure, the increase is 150%.

Laser-Textured Hybrid Brass Pattern Array Surface for High-Efficiency Fog Collection

“…In the low-curvature state ( R = 70 mm), the collection efficiency of convex samples is much lower than that of concave samples. This is due to the generation of airflow vortices, increasing the droplet falling speed . Meanwhile, the weight of collected water of the concave surface with a diameter of 50 and 60 mm is similar.…”

“…This is due to the generation of airflow vortices, increasing the droplet falling speed. 55 Meanwhile, the weight of collected water of the concave surface with a diameter of 50 and 60 mm is similar. Furthermore, a SSH-patterned surface with lengths of 60, 70, and 80 mm and a width of 50 mm, respectively, is rolled into cylindrical shape for water collection, as displayed in Figure 7a.…”

Biomimetic Leaf-Shaped Wedge Structure with Mixed Wettability for Fog Harvesting

“…Studies have shown that 3D-structured materials exhibited improved fog collection performance, attributable to their large specific surface area. 27,28 In other words, introducing 3D structures compared to two-dimensional (2D) or onedimensional (1D) structures provides a larger area for the fog droplet to be captured. Once the contact area increases, the droplet capture and transportation area increases, leading to more area available for droplet contact with the surface and facilitating droplet harvesting.…”