A study on fabrication of PVDF-HFP/PTFE blend membranes with controllable and bicontinuous structure for highly effective water-in-oil emulsion separation

Wang, Xinya; Liu, Hailiang; Chen, Mingxing; Hao, Jian; Wu, Yanjie

doi:10.1039/c8ra04547j

Cited by 27 publications

(14 citation statements)

References 34 publications

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“…As the density of the PDMS microsphere aerogel is much lower than that of PVDF nanofibers, the PDMS microspheres are suspended in the high-voltage electric field, which descend slowly and mainly coat on the nanofiber surface. − Consequently, Si elements could be only observed on the microspheres, while the F elements appear on both the microspheres and the nanofibers. The structure of the PVDF/PDMS nanofiber membranes is similar to the results reported previously. − During this process, the monomers of PDMS solution and PVDF solution could hardly be mixed uniformly in the needles; however, the PVDF solution and PDMS solution could still diffuse each other. The PDMS microspheres could be formed at first since the viscosity of the outer solution is not high enough to form stable a Taylor’s cone. , Notably, some of the PVDF solution diffused into the outside solution surrounded by the PDMS microspheres, as THF evaporates more quickly than DMF. − Due to the solidification of the PDMS, the evaporation rate of DMF becomes slower.…”

Section: Resultssupporting

confidence: 83%

Constructing Scalable Superhydrophobic Membranes for Ultrafast Water–Oil Separation

et al. 2021

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Superhydrophobic membranes are desirable for separation of water-in-oil emulsions, membrane distillation, and membrane condensation. However, the lack of large-scale manufacture methods of superhydrophobic membranes hampers their widespread applications. Here, a facile method of coaxial electrospinning is provided to manufacture superhydrophobic membranes for the ultrafast separation of waterin-oil emulsions. Under the high-voltage electric field, the polydimethylsiloxane (PDMS)-coated polyvinylidene fluoride (PVDF) nanofibers and PDMS microspheres with PVDF nanobulges were integrated together during the electrospinning process. Moreover, asymmetric composite membranes with selective layers are designed to reduce the resistance of the mass transfer. Consequently, the as-prepared asymmetric composite membrane exhibits an ultrafast permeance and excellent separation efficiency of about 99.6%, outperforming most of the state-of-the-art membranes reported previously. Most importantly, the membrane could be as large as 770 cm 2 , could be manufactured continuously, and could be easily enlarged further via tailoring the roller receptor, showing strong promise in the separation of water-in-oil emulsions.

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Section: Resultssupporting

confidence: 83%

Constructing Scalable Superhydrophobic Membranes for Ultrafast Water–Oil Separation

et al. 2021

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“…Membrane emulsification is commonly used to produce O/W emulsions. Only a few studies have reported its utilization in preparing W/O emulsions with hydrophobic membranes such as hydrophobic Shirasu‐porous‐glass (SPG) membrane, ceramic membrane, and polytetrafluoroethylene (PTFE) membrane (Alliod, Messager, Fessi, Dupin, & Charcosset, ; Wang et al., ; Wu, Jing, Xing, & Xu, ). The particle size of W/O emulsion is highly dependent on the interfacial tension between water and oil phases, emulsifier concentration, membrane pressure, and the pore size of membranes.…”

Section: Formation Of W/o Emulsions: Emulsification Methodsmentioning

confidence: 99%

Review on the Stability Mechanism and Application of Water‐in‐Oil Emulsions Encapsulating Various Additives

Zhu

Pan

Jia

et al. 2019

Comp Rev Food Sci Food Safe

130

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Water‐in‐oil (W/O) emulsions can be used to encapsulate and control the release of bioactive compounds for nutrition fortification in fat‐based food products. However, long‐term stabilization of W/O emulsions remains a challenging task in food science and thereby limits their potential application in the food industry. To develop high‐quality emulsion‐based food products, it is essential to better understand the factors that affect the emulsions’ stability. In real food system, the stability situation of W/O emulsions is more complicated by the fact that various additives are contained in the products, such as NaCl, sugar, and other large molecular additives. The potential stability issues of W/O emulsions caused by these encapsulated additives are a current concern, and special attention should be given to the relevant theoretical knowledge. This article presents several commonly used methods for the preparation of W/O emulsions, and the roles of different additives (water‐ and oil‐soluble types) in stabilizing W/O emulsions are mainly discussed and illustrated to gain new insights into the stability mechanism of emulsion systems. In addition, the review provides a comprehensive and state‐of‐art overview of the potential applications of W/O emulsions in food systems, for example, as fat replacers, controlled‐release platforms of nutrients, and delivery carrier systems of water‐soluble bioactive compounds. The information may be useful for optimizing the formulation of W/O emulsions for utilization in commercial functional food products.

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“…[6][7][8] Flexible polymer-based membranes have received a lot of interests because they have shown outstanding and unique superiorities. Nowadays, various polymer membranes have been developed, such as polystyrene, 8 polyacrylonitrile, 9,10 polyimide, 11 polysulfone, 12 polyvinylidene fluoride, 13,14 polypropylene, 7 polyurethane 15 and so forth. Among them, nanofiber polymer membranes further have virtues as high porosity, large specific surface area, and homogeneity of fiber pore size.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and electrospinning of multiscale‐ordered PLA/LDH@AgGB composite nanofibrous membrane for antibacterial and oil–water separation

Cheng¹,

Liu

Zhang

et al. 2022

J of Applied Polymer Sci

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In recent years, the problem of oily sewage has seriously affected the ecological environment and human health. Thus, we prepared a novel biodegradable poly (lactic acid) (PLA) membrane with antibacterial property and oil–water separation function via electrospinning method. First, the matter of silver ion glass microbeads (AgGB) loaded with layered double hydroxides (LDHs) and the LDH@AgGB modified with 3‐triethoxysilyl‐1‐Propanamine (APTES) were synthesized. Then, the LDH@AgGB were blended with PLA to prepare PLA/LDH@AgGB composite. And the PLA nanofibrous membranes were electrospun. The results showed that APTES could significantly improve the dispersion and compatibility of LDH@AgGB in PLA matrix. The addition of A‐LDH@AgGB could greatly improve the crystallinity, and control the porosity and pore‐size of PLA membranes. The maximum water contact angle of the PLA membranes could reach to 109.31°, while the oil contact angle of the PLA membranes decreased to 0° resulting in a high oil absorption capacity, and fast oil absorption rate performance. Meanwhile, the PLA membrane had efficient antibacterial property against Escherichia coli. The reported novel LDH@AgGB and its PLA composite membrane provided a method for designing and preparing environmental‐friendly, high‐performance materials with both excellent antibacterial property and oil–water separation.

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A study on fabrication of PVDF-HFP/PTFE blend membranes with controllable and bicontinuous structure for highly effective water-in-oil emulsion separation

Abstract: PVDF-HFP/PTFE blend membranes were prepared for the first time via TIPS method with DBP and DOP as mixed diluent and PTFE as the blending polymer. The obtained membranes could separate different water-in-oil emulsions effectively.

Cited by 27 publications

References 34 publications

Constructing Scalable Superhydrophobic Membranes for Ultrafast Water–Oil Separation

Constructing Scalable Superhydrophobic Membranes for Ultrafast Water–Oil Separation

Review on the Stability Mechanism and Application of Water‐in‐Oil Emulsions Encapsulating Various Additives

Synthesis and electrospinning of multiscale‐ordered PLA/LDH@AgGB composite nanofibrous membrane for antibacterial and oil–water separation

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