Hybrid wettability surfaces with hydrophobicity and hydrophilicity for fog harvesting

Wang, Jing; Guo, Ying; Pan, Guoyuan; Yu, Li; Zhang, Yang; Yu, Hao; Zhao, Muhua; Zhao, Guoke; Tang, Gongqing; Liu, Yiqun

doi:10.1016/j.colsurfa.2022.129555

Cited by 11 publications

(4 citation statements)

References 40 publications

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“…To date, several common strategies, including direct spraying/inkjet printing, mask-based lithograph, material compounding, etc., have been used to develop patterned surfaces with different wettability. ,− To optimize the wettability further, these patterning strategies are usually combined with surface roughening via nanomaterial deposition or surface ablating. However, these preparation methods are complex and difficult to manipulate flexibly.…”

Section: Introductionmentioning

confidence: 99%

Improved Water Collection from Short-Term Fog on a Patterned Surface with Interconnected Microchannels

Wang,

Zhou,

Han

et al. 2024

Environ. Sci. Technol.

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Fog harvesting is considered a promising freshwater collection strategy for overcoming water scarcity, because of its environmental friendliness and strong sustainability. Typically, fogging occurs briefly at night and in the early morning in most arid and semiarid regions. However, studies on water collection from short-term fog are scarce. Herein, we developed a patterned surface with highly hydrophilic interconnected microchannels on a superhydrophobic surface to improve droplet convergence driven by the Young−Laplace pressure difference. With a rationally designed surface structure, the optimized water collection rate from mild fog could reach up to 67.31 g m −2 h −1 (6.731 mg cm −2 h −1 ) in 6 h; this value was over 130% higher than that observed on the pristine surface. The patterned surface with interconnected microchannels significantly shortened the startup time, which was counted from the fog contact to the first droplet falling from the fog-harvesting surface. The patterned surface was also facilely prepared via a controllable strategy combining laser ablation and chemical vapor deposition. The results obtained in outdoor environments indicate that the rationally designed surface has the potential for short-term fog harvesting. This work can be considered as a meaningful attempt to address the practical issues encountered in fog-harvesting research.

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Section: Introductionmentioning

confidence: 99%

Improved Water Collection from Short-Term Fog on a Patterned Surface with Interconnected Microchannels

Wang,

Zhou,

Han

et al. 2024

Environ. Sci. Technol.

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“…Thus, creating coatings with topologically both hydrophilic and hydrophobic zones has developed as an important idea for fog collection. [8] Several approaches, including mussel-inspired chemistry, [9] chemical synthesis, [10] and laser etching, [7c] have been proposed to create hydrophilic domains/structures on superhydrophobic surfaces. These strategies can considerably enhance the fog collection efficiency.…”

Section: Introductionmentioning

confidence: 99%

Durable Superhydrophobic Surfaces with Self‐Generated Wenzel Sites for Efficient Fog Collection

Zhang,

Li,

Zhou

et al. 2024

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Harvesting freshwater from fog is one of the possible solutions to the global water scarcity crisis. Surfaces with both hydrophobic and hydrophilic regions are extensively employed for this purpose. Nevertheless, the longevity of these surfaces is still constrained by their delicate surface structures. The hydrophilic zones may become damaged or contaminated after repeated use, thereby compromising their effectiveness in fog collection. The preparation of generally applicable durable superhydrophobic coatings with self‐generated Wenzel sites is reported here for long‐term efficient and stable fog collection. The coatings are prepared by depositing the poly(tannic acid) coating as the primer layer on various substrates, self‐assembly of trichlorovinylsilane into staggered silicone nanofilaments, and then thiol–ene click reaction with 1H,1H,2H,2H‐perfluorodecanethiol. The coatings demonstrate remarkable static superhydrophobicity, robust impalement resistance, and stable self‐generated Wenzel sites for water droplets. Therefore, the fog collection rate (FCR) of the coatings reaches 2.13 g cm−2 h−1 during 192 h continuous fog collection, which is triple that of bare substrate and outperforms most previous studies. Moreover, the systematic experiments and models have revealed that the key factors for achieving high FCR on superhydrophobic coatings are forming condensed droplets ≈1 mm in critical radius and a Wenzel site proportion of 0.3–0.4.

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“…However, a strategy comprising superwettable patterned composite surfaces provides a more efficient and versatile way to manipulate droplets, and this strategy has gained considerable interest across many research fields. The unique wetting phenomenon exhibited by superwettable patterned composite surfaces has enabled a wide variety of applications, such as microelectrode patterning, [18][19][20] water collection, [21][22][23] biological monitoring 24 and analyte enrichment, 25,26 and thus also holds great potential for microfluidic applications. [27][28][29][30][31][32] Recently, the development of micro/nanotechnology has enabled the design and manufacture of high-precision surfaces with composite patterns.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser-scribed superhydrophilic/superhydrophobic self-splitting patterns for one droplet multi-detection

et al. 2023

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Hybrid wettability surfaces with hydrophobicity and hydrophilicity for fog harvesting

Cited by 11 publications

References 40 publications

Improved Water Collection from Short-Term Fog on a Patterned Surface with Interconnected Microchannels

Improved Water Collection from Short-Term Fog on a Patterned Surface with Interconnected Microchannels

Durable Superhydrophobic Surfaces with Self‐Generated Wenzel Sites for Efficient Fog Collection

Femtosecond laser-scribed superhydrophilic/superhydrophobic self-splitting patterns for one droplet multi-detection

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