A single step fabrication of bio-inspired high efficiency and durable water harvester made of polymer membranes

Huang, Zhao‐Xia; Liu, Huan; Wong, Shing‐Chung; Qu, Jinping

doi:10.1016/j.polymer.2019.121843

Cited by 7 publications

(5 citation statements)

References 29 publications

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“…Thanks to the photoresponse of the titanium dioxide particles, the membrane exhibited SHB–SHL after UV irradiation. The hydrophilic area was propitious to water capture, and the hydrophobic area was propitious to water removal; hence, the membrane could be applied to fog harvesting. − …”

Section: Resultsmentioning

confidence: 99%

Simple Method for the Fabrication of Multiple Superwetting Surfaces with Photoresponse

et al. 2021

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There have been many studies on special wetting surfaces, but most of them just stay superlyophobic in air or underwater. In this work, a membrane with photoresponse is fabricated by spraying hybrid particles of silicon and titanium dioxide. Under the combined action of hybrid particles and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, the prepared membrane is superhydrophobic in air. Because of the presence of titanium dioxide, the membrane can realize the transformation from superoleophilic underwater to superoleophobic underwater through UV irradiation and heating. Surprisingly, the membranes with superoleophobicity underwater are also superhydrophobic underoil. Thanks to this unique wettability transition, the prepared membrane can be applied to emulsion separation and fog harvesting. This is inspiring for the preparation and the multifunctional application of multiphase media superlyophobic surfaces.

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Section: Resultsmentioning

confidence: 99%

Simple Method for the Fabrication of Multiple Superwetting Surfaces with Photoresponse

et al. 2021

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“…The results are given in Table 2. Huang et al defined water harvesting efficiency as the weight of water per unit area per hour [9]. The highest water collection efficiency was obtained as 87 mg/cm 2 /h with Sample 2.…”

Section: Water Harvesting From Wire Meshmentioning

confidence: 99%

“…Parker et al [6] found that the Namib desert beetle harvests water from thin air through hydrophilic and hydrophobic regions on its back. Several other studies have also revealed that the hydrophilic/hydrophobic structures can be used to capture and condense water from the air [7][8][9][10]. Zhai et al developed a surface consisting of hydrophilic patterns on a superhydrophobic surface to mimic the wing surface of the Namib Desert beetle for water harvesting [7].…”

Section: Introductionmentioning

confidence: 99%

“…They used polyvinylidene fluoride (PVDF) and expanded graphite (EG) to create bead-on-string nanofibers which are inspired by spider silk [8]. They also fabricated bicomponent nanofibers from polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN) which are inspired by the Namib Desert beetle [9]. While PVDF provided hydrophobicity PAN and EG created hydrophilic segments of the nanofibrous material.…”

Section: Introductionmentioning

confidence: 99%

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A Hydrophilic/Hydrophobic Composite Structure for Water Harvesting from the Air

Başal

ORAL

2022

Tekstil Ve Konfeksiyon

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The purpose of this study is to improve the water harvesting capacity of the traditional wire mesh from the fog by modifying its surface using a nature-inspired composite structure consisting of hydrophilic and hydrophobic zones. Hydrophilic zones were obtained by electrospinning or electrospraying of the polyamide 6 (PA6) / chitosan (CH) blend, and similarly hydrophobic zones were attained by electrospraying of polycaprolactone (PCL). The water harvesting capacity of the resulting meshes was tested and compared with each other. The highest water harvesting capacity was achieved with the PA6/CH nanofiber coated wire mesh as 87 mg / cm2/h. This mesh collected twice as much water compared to the uncoated mesh. However, its water collection rate decreased when nanofiber surface reached the saturation level. The addition of hydrophobic PCL particles onto nanofibers reduced the amount of water captured. In this case, the water collection rate of the mesh continued to increase.

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“…Huang et al (Huang et al, 2019) effectively developed a water harvesting collector from hydrophobic and hydrophilic combination. This procedure was done by a uni-step approach of electro-spinning PVDF/PAN composite solutions.…”

Section: Mesh Materials and Coatingsmentioning

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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A single step fabrication of bio-inspired high efficiency and durable water harvester made of polymer membranes

Cited by 7 publications

References 29 publications

Simple Method for the Fabrication of Multiple Superwetting Surfaces with Photoresponse

Simple Method for the Fabrication of Multiple Superwetting Surfaces with Photoresponse

A Hydrophilic/Hydrophobic Composite Structure for Water Harvesting from the Air

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

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