**5. Conclusion**

In conclusion, fog-collecting function can be obtained by employing various biomimetic patterns inspired by diverse natural organisms. The water collection performance is firmly associated with the ability to seize fog-water from wet environment and the ability of directional droplet transport after the fog-water being captured. What on earth is more important may depend on the different foggy environment (e.g., the humidity or fog-flow rate of the environment). This question should be perfectly solved via simulated calculation and experimental verification in future research. Additionally, it is difficult to compare the absolute value of water-collecting efficiency since the fog-harvesting tests was carried out in different foggy environment (e.g., difficult humidity, fog-flow rate, temperature, and/or pressure) by researchers. However, the above sections have explained and concluded how to change the processing parameter to improve the water-collecting performance.

In terms of the raw materials of the fog harvester, both organic (including but not limited to various polymers and biomaterials) and inorganic (containing metals, glass, silicon slice, etc.) materials were employed. As for the wettability, appropriate hydrophilicity is beneficial to fog-water capturing while water transport can be accelerated using micro/nano-structured or/and hydrophobic surfaces.

Not only was the fog-harvesting efficiency significant, but also the mechanical property, durability, economy, degradability, and biocompatibility should be considered. It also merits noting that magnetic, light, electric, thermal, and pH responds of specific materials are possible to be designed as driving force for accelerating the speed of water direction removal, which would be a promising research direction in the future [2, 58].

The studies concerning bio-inspired fog-harvesting performance involves a multisubject course. On the one hand, brand-new chemical, physical, and mechanical routes to manufacture pattern with fog-harvesting capacity has been developed. On the other hand, these findings are most likely to be put into practice in various domains such as fluidics, hydraulics, environment-protecting, pharmaceuticals, mechanics and textile.
