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Robust patterned superoleophobic platform for efficient water harvesting

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Abstract

With the development of global industry and the increase of population, the shortage of freshwater resources has become a serious global challenge to the sustainable development of human society, prompting in-depth research on advanced water-harvesting technologies. However, the existing methods have many defects, such as easy pollution, insufficient water transportation speed, low water collection efficiency, complex preparation process, expensive raw materials, and so on. Here, inspired by natural organisms, such as beetles and cactus thorns, a new patterned surface combining a superamphiphobic region and a triangular fluorosurfactant (capstone FS50)-modified hydrophilic region has been designed for efficient and rapid water collection and condensation. The superamphiphobic part has an efficient water transmission capacity. On the one hand, owing to a good hydrophilic property, the FS50-modified part efficiently collects fog droplets that are further condensed into much larger water droplets. On the other hand, many large water drops condensed on the superamphiphobic region easily roll onto the hydrophilic FS50-modified surface, and form much larger droplets when combined with the original ones. The patterned surface achieves a very large water collection rate (WCR) of 20.6 mg min−1 cm−2, which is much larger than others reported in previous papers, while it is 1.5 and 1.3 times than that of single superamphiphobic and FS50-modified surfaces. Since both the patterns show superior oil repellency, it presents good resistance to organic pollution, resulting in very superior chemical stability and recyclability. Even after water collection for 60 cycles, the patterned surface can still reach a WCR value of 18 mg min−1 cm−2. The patterned surfaces also collect acid fog, alkali fog, and hot water fog when their WCR values are 20.1, 19.8, and 20.5 mg min−1 cm−2, respectively. This work has found a new patterned superoleophobic surface for efficient water collection, which achieves robust mechanical durability and chemical stability.

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Acknowledgments

Financial supports by Natural Science Foundation of Hebei Province “(E2020201035)” is gratefully acknowledged.

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Authors and Affiliations

  1. College of Chemistry and Materials Science, Key Laboratory of Analytical Science and Technology of Hebei Province, Hebei University, Baoding, 071002, Hebei Province, People’s Republic of China

    Pan Li, Chenyang Zhao & Shan Peng

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  1. Pan Li
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  2. Chenyang Zhao
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  3. Shan Peng
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Contributions

PL: Investigation, Data curation. CZ: Data curation, Revision. SP: Methodology, Writing original draft, Funding acquisition.

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Correspondence to Shan Peng.

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Li, P., Zhao, C. & Peng, S. Robust patterned superoleophobic platform for efficient water harvesting. J Coat Technol Res 20, 2019–2029 (2023). https://doi.org/10.1007/s11998-023-00796-1

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