Surface wettability of vertical harps for fog collection

Azeem, Musaddaq; Noman, Muhammad Tayyab; Petrů, Michal; Shahid, Muhammad; Khan, Muhammad Qamar; Wiener, Jakub

doi:10.1016/j.surfin.2022.101842

Cited by 13 publications

(9 citation statements)

References 46 publications

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“…Within the fog flow quantities (q 0 ) of 25-500 g h −1 , the onset slipping time (t 0 ) of HB is only 42%-61% of that for hydrophilicity and 61%-79% of that for bare stainless steel. This phenomenon is consistent with a previous report and could be interpreted as wettability modification altering intermolecular interactions in the solid-liquid boundary layer [34]. The oxygen-containing groups in HL coating enhance the pinning force of the surface, thus making droplets adhere to the collection wire for a long time.…”

Section: Single Collection Wiresupporting

confidence: 92%

Enhancing fog collection by optimizing wettability combination and fork-row collector arrangement: light and heavy fog

Zhang,

Xiao,

et al. 2023

J. Phys. D: Appl. Phys.

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Fog collection is essential to alleviate water scarcity in arid areas. However, the vast majority of existing fog collectors only work effectively in heavy fog. To broaden the fog concentration range for efficient work, an optimization strategy based on wettability combination and fork-row arrangement is proposed in this work. Single-layer experiment results show that a hydrophilic (HL) surface with high deposition capacity collects droplets at a faster rate in light fog (25–80 g h−1), while the collection rate of a hydrophobic (HB) surface with high drainage capacity is higher in heavy fog (220–500 g h−1). Double-layer experiment results show that in light fog, the best combination of double-layer collection electrodes is HL–HL, while HB–HL performs best in heavy fog. A 35% improvement in collection rate can be obtained simply by changing the arrangement from smooth-row (S) to fork-row (F), which is attributed to the increased effective collision area of droplets. In our series of experiments, at 50 g h−1, the collection rate of double-layer combination HL–HL(F) is 56.7% higher than that of single-layer HL. In particular, the collection rate of HB–HL(F) reaches 1434.7 mg cm−2 h−1 at 500 g h−1. Such a good performance is attributed to the force imbalance of hanging droplets caused by wettability differences, which tends to transport small droplets on HB towards HL directionally, resulting in a rapid droplet slippage. Therefore, the HB–HL accelerates drainage and refreshes capture points. Furthermore, fog collection performance is also influenced by layer spacing, which has an optimal distance. These findings provide a promising method for practical applications of fog collectors in a wide range of fog flow quantities, enhancing adaptability to variable environments.

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Section: Single Collection Wiresupporting

confidence: 92%

Enhancing fog collection by optimizing wettability combination and fork-row collector arrangement: light and heavy fog

Zhang,

Xiao,

et al. 2023

J. Phys. D: Appl. Phys.

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“…Recent research compared the wetting behaviors of hydrophilic and hydrophobic surfaces, and it reveals that hydrophobic surface improves the collection rate, however, hydrophilic surface shows adverse effects. 26,27 Thus, reasonably adjusting the area ratio of different wetting areas is significantly important for the fog collection efficiency.…”

Section: Bionic Surfaces Of a Single Biological Prototypementioning

confidence: 99%

“…It has been proven that fog collection is efficient for collecting water in dry but foggy areas. [26][27][28] As a hot research topic in recent years, bionic surfaces with fog collection functions have attracted widespread attention in practical applications and basic research. By studying natural organisms and bionic surfaces, more avenues are provided for the development of fog collection devices.…”

Section: Introductionmentioning

confidence: 99%

Research progress of bionic fog collection surfaces based on special structures from natural organisms

Yang,

Song,

Zhang

et al. 2023

RSC Adv.

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“…Fog water collectors are usually constructed using permeable polyethylene (PE) or polypropylene (PP) meshes , and vary significantly in yield, ranging between 3 and 75 L·m –2 per day . An efficient fog collector allows the passage of humid air through the permeable mesh collector, recovers most of the liquid from the fog stream, and quickly releases the water from the mesh for storage …”

Section: Introductionmentioning

confidence: 99%

“…7 An efficient fog collector allows the passage of humid air through the permeable mesh collector, recovers most of the liquid from the fog stream, and quickly releases the water from the mesh for storage. 8 Inspired by the Namib beetle, there have been many functional materials with hybrid wettability for water harvesting. 9 Such materials containing hydrophobic and hydrophilic properties integrate and balance two competing processes, droplet capture and shedding, significantly improving waterharvesting efficiency.…”

Section: ■ Introductionmentioning

confidence: 99%

Photoresponsive Electrospun Fiber Meshes with Switchable Wettability for Effective Fog Water Harvesting in Variable Humidity Conditions

Parisi,

Szewczyk,

Narayan

et al. 2023

ACS Appl. Mater. Interfaces

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The global water supply worsens yearly with climate change; therefore, the need for sustainable water resources is growing. One of them is fog water collectors with variable surface wettability, with multifunctional designs for utilization worldwide and to address regions with low humidity levels. Therefore, we created fiber meshes with a photoresponsive switchable surface. This study uses electrospun polyvinylidene fluoride (PVDF) meshes, whose wettability is controlled by adding TiO 2 . The fog water collection performance is studied at high and low humidity levels. With TiO 2 -PVDF, the electrospun mesh can be converted from hydrophobic to hydrophilic under UV irradiation and transformed back to a hydrophobic state with heat treatment. The switchable meshes were found to be more effective at water collection after UV irradiation at lower fog rates of 200 mL•h −1 . The ability to switch between hydrophobic and hydrophilic properties as needed is highly desired in fog collection applications using electrospun meshes, as it can improve overall efficiency after UV irradiation.

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Surface wettability of vertical harps for fog collection

Cited by 13 publications

References 46 publications

Enhancing fog collection by optimizing wettability combination and fork-row collector arrangement: light and heavy fog

Enhancing fog collection by optimizing wettability combination and fork-row collector arrangement: light and heavy fog

Research progress of bionic fog collection surfaces based on special structures from natural organisms

Photoresponsive Electrospun Fiber Meshes with Switchable Wettability for Effective Fog Water Harvesting in Variable Humidity Conditions

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