Biomimetic fog harvesting surface by photo-induced micro-patterning of zinc-oxide silver hierarchical nanostructures

Kim, Na Kyong; Kang, Dong Hee; Eom, Hyo J.; Kang, Hyun Wook

doi:10.1016/j.apsusc.2018.11.132

Cited by 42 publications

(11 citation statements)

References 38 publications

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“…The gold substrate also exhibits higher CAH than the Si substrate, leading to comparable water collection. The water nucleation is faster on a hydrophilic substrate than on a hydrophobic substrate due to lower energy barriers . Furthermore, we investigated the influence of surface patterning on fog harvesting.…”

Section: Resultsmentioning

confidence: 99%

Wettability Contrast in the Hexagonally Patterned Gold Substrate of Distinct Morphologies for Enhanced Fog Harvesting

Viswanath

2021

Langmuir

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Inspired by the Stenocara beetle’s hydrophobic–hydrophilic surface, we fabricated hexagonally patterned hydrophobic–hydrophilic surfaces consisting of silicon and gold regions using colloidal lithography and selective surface functionalization. We investigated surface wettability for different patterns (hexagonally ordered nanotriangles and nanoholes) and the influence of surface functionalization (octadecanethiol and 16-mercaptohexadecanoic acid/octadecyltrichlorosilane (MHA/OTS)). The as-prepared patterned substrates exhibit hydrophilicity, which transforms to hydrophobicity after surface functionalization. The MHA/OTS functionalization results in maximum enhancement in the contact angle (114 ± 0.4°) with the least contact angle hysteresis (19 ± 2°). Fog harvesting studies show that the patterned substrate has a higher water collection rate, a factor of 1.32, than the nonpatterned substrates. A further enhancement in water collection (almost twice) is observed with selective functionalization. The patterned (nanohole) and functionalized (MHA/OTS) substrate facilitates rapid falling of droplets at a frequency of 20 mHz and an average droplet mass of 15 ± 2 mg/cm2. Furthermore, it yielded a maximum water collection rate of 1051 ± 132 mg cm–2 h–1. This work provides valuable insights into the influence of surface wettability and morphology for fog harvesting applications.

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Section: Resultsmentioning

confidence: 99%

Wettability Contrast in the Hexagonally Patterned Gold Substrate of Distinct Morphologies for Enhanced Fog Harvesting

Viswanath

2021

Langmuir

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“…Kim et al (Kim et al, 2019) manufactured a new methodology for fog harvesting utilizing nanostructures made of zinc oxide-silver hierarchy. They chemically formed a patterned surface initially made of zinc oxide nanowires that were made by a convenient hydrothermal process to create the superhydrophilic region.…”

Section: (B) (C) (A)mentioning

confidence: 99%

“…Figure18. Schematic illustration of the experimental set up for fog harvesting system(Kim et al, 2019).…”

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confidence: 99%

Fog collection - materials, techniques and affecting parameters - A review

ELSHENNAWY¹

2022

Seatific

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Water scarcity has shown a great challenge during the past decades with millions suffering from lack of potable water. Although, people try to benefit from the water naturally existing in air by two sources: fog and humid air. In this paper, we mainly allot the work on fog water. Fog collection is undergone using fog mesh collectors. There are lots of methods to rate the quality of fog water collection. Most used method is the quantity of water collected in kilograms for a one square meter harvester mesh per one hour. However, sometimes water contact angle on a flat surface of the mesh's material is also reliable. Both give an indication of hydrophobicity or water repellency which is significant for high fog collection efficiency. In addition, drop falling velocity and deposition time of water on the harvester measured in seconds are both indications for fog collection efficiency but rarely used. The scope of this article is to make a helpful guide for fog harvesting technology with the parameters that control the efficiency of this water resource. In addition, there is a detailed review in the chemistry of some of the previous researches on fog water collection inspired by natural existing plants and animals that survive in arid zones where only fog or humid air is found. Concerning the fog harvesting surface material, there will be a comparison between different essential parameters as mentioned above or other general indications. Some of the procedures to create the material will also be explained.

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“…Therefore, it is necessary to look for alternatives to supply freshwater without affecting the environment and with adequate conditions for human consumption or use in other activities. At a global level, various strategies have been presented to reduce water scarcity, specifically in the improvement of hydraulic distribution systems (storage, distribution, and irrigation systems), rainwater harvesting, seawater desalination technologies, water management, and atmospheric water harvesting [21][22][23][24][25][26][27][28][29]. From the latter, fog and dew are major sources of water for arid regions [30].…”

Section: Introductionmentioning

confidence: 99%

“…Dew is formed through two main steps: (1) Nucleation of a liquid phase forming a droplet on an obstacle, and (2) growth of the droplet at the expense of the surrounding atmosphere [31,32]. Based on the foregoing, various technologies have been developed for water harvesting, such as (i) salts or desiccants (liquids, solids and compounds) operating on various energy sources [33][34][35][36], (ii) smart materials such as bioinspired materials, nanostructured materials, gels and hydrogels [21,37,38], (iii) radiative cooling (Radiator-Condensers) by emitting thermal infrared radiation to the cold universe through the atmospheric window [39,40] and (iv) direct cooling by commonly using conventional vapour compression (VC) refrigeration systems or other cooling technology [2,41,42]. This last method consists of cooling the air humidity mixture to a temperature below dew point, causing moisture condensation and water harvesting, which depend on atmospheric air, a huge and renewable water deposit.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study on the Use of an Atmospheric Water Generator (AWG) for the Harvesting of Fresh Water in a Semi-Arid Region Affected by Mining Pollution

et al. 2019

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Worldwide, the shortage of fresh water has increased exponentially due to population growth and contamination of available water, especially in water tables that provide water for general consumption. One of the main pollutants of water is arsenic (As), present in the environment and in most mining/metallurgical processes, which is a major health risk, especially as a carcinogen. In the region of Matehuala, San Luis Potosi (SLP), Mexico, a highly productive mining area, arsenic concentrations of 138.1 mg/kg have been found in soils—6.2 times higher than what is allowed in domestic soils, while in water it is reported up to 158 mg/L, exceeding permissible limits for human consumption. In addition to As pollution, the region suffers from water shortage both in the city and in rural communities. Therefore, it is necessary to explore new technologies to provide the population with fresh water. This paper presents a feasibility study on the use of an atmospheric water generator (AWG) to capture fresh water in the region of Matehuala, SLP. The region was found to have the necessary environmental conditions to use AWGs, with an annual average relative humidity (RH) of approximately 60%. Using a mathematical model of a dehumidifier, water harvesting can be evaluated under the region’s prevailing climatic conditions. The month with lowest harvest was found to be January, with 0.89 to 3.6 L/day, while the month with largest harvest was August at 3.9 to 18 L/day and water production costs of 0.0093 and $ 0.038 USD/L, respectively. The study concludes that the use of AWGs would help alleviate water shortages, thus benefiting marginalized people or communities, preserving ecosystems and the environment.

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Biomimetic fog harvesting surface by photo-induced micro-patterning of zinc-oxide silver hierarchical nanostructures

Cited by 42 publications

References 38 publications

Wettability Contrast in the Hexagonally Patterned Gold Substrate of Distinct Morphologies for Enhanced Fog Harvesting

Wettability Contrast in the Hexagonally Patterned Gold Substrate of Distinct Morphologies for Enhanced Fog Harvesting

Fog collection - materials, techniques and affecting parameters - A review

A Feasibility Study on the Use of an Atmospheric Water Generator (AWG) for the Harvesting of Fresh Water in a Semi-Arid Region Affected by Mining Pollution

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