Hierarchically-structured superhydrophobic POSS/PVDF composite membrane for anti-fouling and anti-wetting membrane distillation

Zheng, Liping; Wang, Kai; Hou, Deyin; Jia, Xiaolin; Zhao, Zhichao

doi:10.1016/j.desal.2021.115512

Cited by 36 publications

(18 citation statements)

References 73 publications

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“…The surface wettability of relevant membranes fabricated at each stage was quantified by the contact angle (CA) measurement, as shown in Figure B–D. The Substrate (superhydrophobic) can resist low-surface-energy contaminants such as ethanol, oil, and SDS solution droplet, demonstrating that adding F-POSS to the nanofiber improved the membrane antiwetting resistance. , However, this substrate was limited by severe fouling underwater, causing oil droplets to spread easily across the membrane. Fortunately, the superhydrophilic SiO 2 /PAN skin layer, when electrosprayed onto the substrate, created underwater oleophobic behavior (Figure B). , This was possible because the trapped water in the pores of the superhydrophilic skin layer prevented oil droplets from directly contacting the Substrate (superhydrophobic) .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The Substrate (superhydrophobic) can resist low-surface-energy contaminants such as ethanol, oil, and SDS solution droplet, demonstrating that adding F-POSS to the nanofiber improved the membrane antiwetting resistance. 48,49 However, this substrate was limited by severe fouling underwater, causing oil droplets to spread easily across the membrane. Fortunately, the superhydrophilic SiO 2 /PAN skin layer, when electrosprayed onto the substrate, created underwater oleophobic behavior (Figure 3B).…”

Section: Materials Andmentioning

confidence: 99%

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Interlayered Interface of a Thin Film Composite Janus Membrane for Sieving Volatile Substances in Membrane Distillation

Zhu

Liu

Tan

et al. 2023

Environ. Sci. Technol.

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Hypersaline wastewater treatment using membrane distillation (MD) has gained significant attention due to its ability to completely reject nonvolatile substances. However, a critical limitation of current MD membranes is their inability to intercept volatile substances owing to their large membrane pores. Additionally, the strong interaction between volatile substances and MD membranes underwater tends to cause membrane wetting. To overcome these challenges, we developed a dual-layer thin film composite (TFC) Janus membrane through electrospinning and sequential interfacial polymerization of a polyamide (PA) layer and cross-linking a polyvinyl alcohol/polyacrylic acid (PP) layer. The resulting Janus membrane exhibited high flux (>27 L m–2 h–1), salt rejection of ∼100%, phenol rejection of ∼90%, and excellent resistance to wetting and fouling. The interlayered interface between the PA and PP layer allowed the sieve of volatile substances by limiting their dissolution–diffusion, with the increasing hydrogen bond network formation preventing their transport. In contrast, small water molecules with powerful dynamics were permeable through the TFC membrane. Both experimental and molecular dynamics simulation results elucidated the sieving mechanism. Our findings demonstrate that this type of TFC Janus membrane can serve as a novel strategy to design next-generation MD membranes against volatile and non-volatile contaminants, which can have significant implications in the treatment of complex hypersaline wastewater.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Materials Andmentioning

confidence: 99%

Interlayered Interface of a Thin Film Composite Janus Membrane for Sieving Volatile Substances in Membrane Distillation

Zhu

Liu

Tan

et al. 2023

Environ. Sci. Technol.

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“…[31] For practical applications, the wetting effect with the solid-liquid interaction plays a non-negligible role and is often involved in materials design. Typical examples for the desired materials are self-cleaning, [32][33][34][35] anti-fouling, [36][37][38] antifogging [39,40] of solid substrates including glasses, metals, and ceramics. These functionalities may be achieved by changing the surface chemistry, [41] for example coating, [42,43] or by modifying the surface microstructures, [44][45][46][47] which are known to be chemically and mechanically patterned substrates, respectively.…”

Section: Introductionmentioning

confidence: 99%

Wetting Effect on Patterned Substrates

Wang

Nestler

2023

Advanced Materials

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A droplet deposited on a solid substrate leads to the wetting phenomenon. A natural observation is the lotus effect, known for its superhydrophobicity. This special feature is engendered by the structured microstructure of the lotus leaf, namely, surface heterogeneity, as explained by the quintessential Cassie-Wenzel theory (CWT). In this work, recent designs of functional substrates are overviewed based on the CWT via manipulating the contact area between the liquid and the solid substrate as well as the intrinsic Young's contact angle. Moreover, the limitation of the CWT is discussed. When the droplet size is comparable to the surface heterogeneity, anisotropic wetting morphology often appears, which is beyond the scope of the Cassie-Wenzel work. In this case, several recent studies addressing the anisotropic wetting effect on chemically and mechanically patterned substrates are elucidated. Surface designs for anisotropic wetting morphologies are summarized with respect to the shape and the arrangement of the surface heterogeneity, the droplet volume, the deposition position of the droplet, as well as the mean curvature of the surface heterogeneity. A thermodynamic interpretation for the wetting effect and the corresponding open questions are presented at the end.

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Section: Introductionmentioning

confidence: 99%

“…Among these techniques, superhydrophobicity plays a key role in downstream applications; therefore, considerable efforts have been made in recent years to prepare superhydrophobic materials for various purposes in recent years. [15][16][17][18][19][20][21] It is well known that a low surface energy and micro/nanostructural roughness are the important aspects to prepare superhydrophobic surfaces. Therefore, there are so many methods and researches on the preparation of superhydrophobic materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Highly Adhesion Hydrophobic Membrane and Superhydrophobic Membrane via Electrospinning

Wang,

Sun

et al. 2023

Adv Eng Mater

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Membranes with superhydrophobicity have attracted much attention in recent years for improving self‐cleaning in practical applications. In this study, highly‐adhesion hydrophobic membranes and superhydrophobic membranes were prepared and used for preciously rare droplets transportation and efficient oil‐water separation separately. The two types of membranes with different applications were prepared by electrospinning and the morphology and structures of the electrospinning membranes were adjusted by regulating serious of parameters including voltage, flow rate and the diameter of the spinning needle. The as‐prepared membranes with apparent superhydrophobicity were fluorine‐free, environmentally friendly materials and realised effective and rapid oil‐water separation; moreover, the membranes exhibit excellent adhesivity when measured by the video‐optical contact angle system, and the maximum adhesion amount was 80 μL. The two membranes reported here were easily fabricated and reproducible, with adhesive and superhydrophobic properties, respectively. so we envision that the membrane has the potential to be used in a variety of practical applications such as the development of robots that require non‐destructive liquids transportation, efficient oil‐water separators and so on.This article is protected by copyright. All rights reserved.

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Hierarchically-structured superhydrophobic POSS/PVDF composite membrane for anti-fouling and anti-wetting membrane distillation

Cited by 36 publications

References 73 publications

Interlayered Interface of a Thin Film Composite Janus Membrane for Sieving Volatile Substances in Membrane Distillation

Interlayered Interface of a Thin Film Composite Janus Membrane for Sieving Volatile Substances in Membrane Distillation

Wetting Effect on Patterned Substrates

Preparation of Highly Adhesion Hydrophobic Membrane and Superhydrophobic Membrane via Electrospinning

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