Surface engineering with microstructured gel networks for superwetting membranes

Jia, Yuandong; Guan, Kecheng; Zhang, Pengfei; Shen, Qin; Wang, Shengyao; Lin, Yuqing; Matsuyama, Hideto

doi:10.1039/d0ta12278e

Cited by 47 publications

(17 citation statements)

References 43 publications

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“…To describe the permeation pressure of membrane contacting with oil or water, wetting mechanisms of PVDF and PVDF‐P/P‐ZIF‐TA are illustrated in Figure . The permeation pressure was calculated according to the Laplace equation, as shown in the following equation: [ 14,59 ]

\begin{equation}\Delta p = 2{\sigma _{\rm{L}}}/r = - 4{\sigma _{\rm{L}}}\cos \theta /d\end{equation}

…”

Section: Resultsmentioning

confidence: 99%

“…To describe the permeation pressure of membrane contacting with oil or water, wetting mechanisms of PVDF and PVDF-P/P-ZIF-TA are illustrated in Figure 12. The permeation pressure was calculated according to the Laplace equation, as shown in the following equation: [14,59] Δp = 2𝜎 L ∕r = −4𝜎 L cos 𝜃∕d (1) whereΔp is the intrusion pressure, 𝜎 L is surface tension of a liquid, r is droplet radius, d is the average pore size of membrane, and 𝜃 is contact angle. PVDF membrane contacting with water will prevent water from passing through membrane pores due to 𝜃>90°and Δp>0, while oil droplets will penetrate PVDF membrane due to𝜃<90°and Δp<0.…”

Section: Oil-in-water Emulsion Separationmentioning

confidence: 99%

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Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Zhao

et al. 2022

Macro Materials & Eng

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Membrane technology is seen as one of the useful strategies for the treatment of oily wastewater, but the membrane fouling in the process of membrane filtration seriously may affect some properties and time-consuming. Hydrophilic membrane surface can reduce membrane fouling. The appropriate design for membrane composition and surface structure can transform membrane surface with expected performance. In this work, hydrophilic polyvinylidene fluoride (PVDF) membranes with micro-nanostructure are fabricated by in situ synthesis and layer-by-layer assembly strategies. A zeolitic imidazolate framework-8 (ZIF-8) and tannic acid are used to construct microstructure and support hydrophilic groups. The water contact angle and water flux of initial PVDF membrane are 110.67°a nd 6585.7 L m −2 h −1 , respectively, while the optimally modified membrane possesses water contact of 14.5°and water flux of 13641.8 L m −2 h −1 . The modified membrane not only owns good underwater oil repellency and oil adhesion resistance but also processes good separation performance for surfactant stable oil-in-water emulsion. Furthermore, the modified membranes exhibit constant permeability and underwater oleophobicity in cycling experiments and harsh environments, indicating that the modified coating has stability against shedding of the modified materials. This method supports valuable references for MOF application in the field of oil-water separation.

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\begin{equation}\Delta p = 2{\sigma _{\rm{L}}}/r = - 4{\sigma _{\rm{L}}}\cos \theta /d\end{equation}

…”

Section: Resultsmentioning

confidence: 99%

Section: Oil-in-water Emulsion Separationmentioning

confidence: 99%

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Zhao

et al. 2022

Macro Materials & Eng

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“…PK membranes were prepared using the nonsolvent-induced phase separation (NIPS) method . Briefly, a homogeneous casting solution was prepared by mixing 2 wt % PEG, 10 wt % PK, and 65 wt % resorcinol in an aqueous solution followed by stirring at 80 °C for 3 h. After 12 h of degassing, the mixture solution was cast on a glass plate using a casting knife with a casting gap of 200 μm.…”

Section: Methodsmentioning

confidence: 99%

“…Functional coatings with controlled physicochemical properties have received significant attention for multiple environmental applications, such as catalysis, , energy, , anticorrosion, sensors, , and antibacterial applications . The development of coatings with superwettability properties is an interesting research topic because such coatings are used in a wide range of applications, such as antifouling, , anti-icing, , water harvesting, − and oil–water separation. − The superwetting property of a material is generally evaluated in terms of its surface free energy and surface micro/nanoroughness; hence, the chemistry and structural assembly of a material significantly affect its superwettability. , While the coating materials exhibit intrinsic hydrophilicity or hydrophobicity, their micro/nanostructures further stabilize their intrinsic surface wettability. , Hydrophilic materials, such as hydrogels , and polyelectrolytes , are used to prepare superwetting coating layers. Nevertheless, more processing steps are usually necessary when these coating materials are applied for different substrates. , …”

Section: Introductionmentioning

confidence: 99%

Nanostructural Manipulation of Polyphenol Coatings for Superwetting Membrane Surfaces

Jia

Guan

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Functional coatings have gained significant attention in multiple environmental and energy-related research fields. One of the coatings with superwetting surfaces has received significant interest, owing to the favorable properties like self-cleaning and antifouling as well as the roles it plays in processes of water harvesting and oil–water separation. Hydrophilic polyphenol molecules show good adhesion to different substrates and provide multiple interactive sites, which serve as building blocks for the preparation of superwetting coatings. In this study, to realize the controlled formation of a polyphenol-based coating and to demonstrate the nanostructural dependence of its superwetting performance, tannic acid (TA) complexed with cations was employed to construct coating networks with either nanorough or nanosmooth surface morphology through a layer-by-layer (LbL) self-assembly method. Both nanostructures could be precisely controlled by adjusting the TA concentration and number of LbL cycles to observe the evolution of the wetting state of the coating. More importantly, while the nanosmooth and nanorough coatings exhibited similar surface chemistry, pore sizes, and superwetting properties, the separation efficiency for oil-in-water emulsions using the membrane with the nanorough coating is 2–5 and 2–10 times that of the one with a nanosmooth coating and the pristine one without a coating, respectively. The experimental results confirmed that the nanorough coating structure contributed to the superwetting state of the membrane surface and, therefore, possessed a stronger ability to repel oil than the nanosmooth coating during the separation process. This work demonstrates a novel strategy for the molecular self-assembly of polyphenols and may provide guidance for designing superwetting coatings.

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“…The negative electrons provided by the PVA molecule and the positron provided by the TE crosslinking agent, will collide with each other through electron transition to produce the chemical crosslinking network structure. 50 When the concentration of the crosslinking agent increases, more metal Ti ions will be bound to the crosslinking sites of PVA gel, which makes the gel structure gradually stable, and therefore, the performance of the gel is improved in all aspects.…”

Section: Gelation Mechanism Of Pva/te Gelmentioning

confidence: 99%

Study on the mechanism and performance of polymer gels byTEandPVAchemical cross‐linking

Zhou

Chu

Fan

et al. 2021

J of Applied Polymer Sci

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Polymer gels are widely used as drilling plugging materials. In this paper, titanium bis(triethanolamine)diisopropoxide (TE) and polyvinyl alcohol (PVA) solution were chemically cross-linked to obtain a gel material. It shows that the OH on the PVA molecular chain are chemically cross-linked with the Ti ion in TE crosslinking agent through complexation reaction, and the crosslinked segment can inhibit the chain motion, resulting in a stable "crab structure" gel configuration. The gel materials synthesized under this configuration were characterized and analyzed by SEM, TG-DSC, GPC, and contact angle measurement. It was demonstrated that the gel performance is optimal when the concentration of TE crosslinking agent is 2.2 wt%, considering the gel strength and gelation time. In addition, the simulated plugging experiment of the gel showed that the service life of the gel was about 72 days, and the sealing performance and tensile recovery performance were significantly improved compared with the previous ones, which would provide a new perspective for the novel plugging materials.

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Surface engineering with microstructured gel networks for superwetting membranes

Abstract: Superwetting surfaces have several applications, such as self-cleaning, anti-fouling, anti-corrosion, water harvesting, and oil–water separation, owing to their distinct structure and properties. Hydrogel-based coatings are particularly attractive owing to their...

Cited by 47 publications

References 43 publications

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Superwetting Polyvinlydene Fluoride Membranes with Micro‐Nano Structure for Oil‐in‐Water Emulsion Separation

Nanostructural Manipulation of Polyphenol Coatings for Superwetting Membrane Surfaces

Study on the mechanism and performance of polymer gels byTEandPVAchemical cross‐linking

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