Water vapor condensation and collection by super-hydrophilic and super-hydrophobic VACNTs

Pinheiro, Romário Araújo; Silva, Amanda Araújo; Trava-Airoldi, V.J.; Corat, Evaldo José

doi:10.1016/j.diamond.2018.05.009

Cited by 22 publications

(6 citation statements)

References 30 publications

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“…Polyethylene (PE) is subsequently deposited on a superhydrophobic VACNTs/steel mesh to enhance surface stability. The prepared superhydrophobic samples are then placed in superhydrophilic VACNTs to achieve a superwettable surface with a superhydrophilic/superhydrophobic pattern on CFF. , The best fog collection result measured by the laboratory fog collection experiment is about 30 L m –2 h –1 (Figure d–-f). The strategy of preparing bionic fog collection materials by simulating the back of Namib Desert beetles is mainly to manufacture alternating wettability surfaces.…”

Section: Bionic Fog Collection Surfacesmentioning

confidence: 99%

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Bionic Surfaces for Fog Collection: A Comprehensive Review of Natural Organisms and Bioinspired Strategies

Ding,

Dong,

et al. 2023

ACS Appl. Bio Mater.

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Section: Bionic Fog Collection Surfacesmentioning

confidence: 99%

Section: Bionic Fog Collection Surfacesmentioning

confidence: 99%

Bionic Surfaces for Fog Collection: A Comprehensive Review of Natural Organisms and Bioinspired Strategies

Ding,

Dong,

et al. 2023

ACS Appl. Bio Mater.

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“…On the other hand, the dew harvesting results with biphilic surfaces vary in the literature. There are cases in which improvement is reported; − an example is the work of Hou et al who incorporated hydrophilic stripes consisting of triangles, on a superhydrophobic background, resulting in biphilic surfaces with a WCR increase more than 1.5× compared to the uniform superhydrophobic surfaces. Yet, in other cases, the incorporation of biphilic patterning results in a decrease of the collection rate. , For instance, Lee et al found out that the incorporation of superhydrophilic spots on a superhydrophobic surface resulted in a WCR decrease.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Water Harvesting on Micro-nanotextured Biphilic Surfaces

Nioras

Ellinas

Gogolides

2022

ACS Appl. Nano Mater.

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Water scarcity is an acute worldwide problem with increasing frequency even in the developed countries of Europe. Nature has inspired scientists to carry out atmospheric water harvesting both from fog and dew on surfaces of extreme wettability or biphilic surfaces (surfaces with hydrophilic and hydrophobic patterns). Literature reports exhibit large variation and contradictory results. Herein, we systematically study the effect of the different biphilic shapes on both dew and fog harvesting, clarifying the variable results observed in the literature. First, we demonstrate a facile and scalable method of biphilic surface fabrication using plasma micro-nanotexturing, plasma deposition, and plasma etching through a stencil mask. We comparatively study the water collection performance of three different biphilic pattern shapes and two uniform patterns, in two different harvesting modes, namely, dew harvesting and fog collection. Our results demonstrate superior atmospheric water collection efficiency for biphilic patterns. We demonstrate increased rate compared to untreated surfaces, 2× for fog collection, and 1.6× for dew harvesting. We also demonstrate that biphilic spot- and biphilic path-like patterns behave differently depending on the harvesting mode: spot patterns show maximum water collection in fog collection and minimum in dew harvesting, whereas path-like patterns show maximum water collection in dew harvesting.

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“…This tension between rapid water capture and removal has led to sophisticated surface designs to obtain both characteristics. For example, over the past few years, many studies have shown interest in designing superhydrophobic surfaces (SHS), − patterned SHS, − or liquid-infused surfaces , to enhance either condensation nucleation or droplet removal. Recently, a hydrophilic directional slippery rough surface (SRS) was designed for water harvesting using salient features of pitcher plants and rice leaves.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Water Condensation on Surfaces with Tunable Wettability

et al. 2020

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Water condensation plays a major role in a wide range of industrial applications. Over the past few years, many studies have shown interest in designing surfaces with enhanced water condensation and removal properties. It is well known that heterogeneous nucleation outperforms homogeneous nucleation in the condensation process. Because heterogeneous nucleation initiates on a surface at a small scale, it is highly desirable to characterize water-surface interactions at the molecular level. Molecular dynamics (MD) simulations can provide direct insight into heterogeneous nucleation and advance surface designs. Existing MD simulations of water condensation on surfaces were conducted by tuning the solid-water van der Waals interaction energy as a substitute for modeling surfaces with different wettabilities. However, this approach cannot reflect the real intermolecular interactions between the surface and water molecules. Here, we report MD simulations of water condensation on realistic surfaces of alkanethiol self-assembled monolayers with different head group chemistries. We show that decreasing surface hydrophobicity significantly increases the electrostatic forces between water molecules and the surface, thus increasing the water condensation rate. We observe a strong correlation between our rate of condensation results and the results from other surface characterization metrics, such as the interfacial thermal conductance, contact angle, and the molecular-scale wettability metric of Garde and co-workers. This work provides insight into the water condensation process at the molecular scale on surfaces with tunable wettability.

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Water vapor condensation and collection by super-hydrophilic and super-hydrophobic VACNTs

Cited by 22 publications

References 30 publications

Bionic Surfaces for Fog Collection: A Comprehensive Review of Natural Organisms and Bioinspired Strategies

Bionic Surfaces for Fog Collection: A Comprehensive Review of Natural Organisms and Bioinspired Strategies

Atmospheric Water Harvesting on Micro-nanotextured Biphilic Surfaces

Molecular Dynamics Simulations of Water Condensation on Surfaces with Tunable Wettability

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