Facile preparation of isotactic polypropylene microporous membranes with bioinspired hierarchical morphology for nano-scale water-in-oil emulsion separation

Sun, Yue; Yang, Zhensheng; Li, Liang; Wang, Zhiying; Sun, Qichao

doi:10.1016/j.memsci.2019.03.058

Cited by 46 publications

(36 citation statements)

References 32 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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“…A capillary flow porometer (3H-2000PB, BeShiDe Inc., Beijing, China) was utilized to test the pore size distribution of the microporous membranes [ 36 , 37 , 38 , 39 ] under ASTM F316. The porosity (A k ) of the membranes was determined using the n-butanol adsorption method.…”

Section: Methodsmentioning

confidence: 99%

Microporous Formation Mechanism of Biaxial Stretching PA6/PP Membranes with High Porosity and Uniform Pore Size Distribution

Fang

Liang

et al. 2022

Polymers

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The low porosity and wide pore size distribution of biaxial stretching PP microporous membranes continue to be the primary impediments to their industrial application. To solve this problem, there is a critical and urgent need to study the micropore-forming mechanism of PP membranes. In this research, the interfacial micropore formation mechanism of PA6/PP membranes during biaxial stretching was investigated. PA6/PP membranes containing spherical PA6 and fibrillar PA6 were found to exhibit different interfacial micropore formation mechanisms. Numerous micropores were generated in the PA6/PP membranes, containing PA6 spherical particles via the interface separation between the PP matrix and PA6 spherical particles during longitudinal stretching. Subsequent transverse stretching further expanded the two-phase interface, promoting the breakdown and fibrosis of the PP matrix and forming a spider-web-like microporous structure centered on spherical PA6 particles. In PA6/PP membranes with PA6 fibers, fewer micropores were generated during longitudinal stretching, but the subsequent transverse stretching violently separated the PA6 fibers, resulting in a dense fiber network composed of PA6 fibers interwoven with PP fibers. Crucially, the PA6/PP biaxial stretching of microporous membranes presented an optimized pore structure, higher porosity, narrower pore size distribution, and better permeability than β-PP membranes. Furthermore, this study explored a new approach to the fabrication of high-performance PA6/PP microporous membranes, with good prospects for potential industrial application.

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“…5 To date, various inorganic and organic membranes have been developed and used for purpose of oil-water separation. [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.…”

Section: Introductionmentioning

confidence: 99%

“…[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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Facile preparation of isotactic polypropylene microporous membranes with bioinspired hierarchical morphology for nano-scale water-in-oil emulsion separation

Cited by 46 publications

References 32 publications

Constructing Scalable Superhydrophobic Membranes for Ultrafast Water–Oil Separation

Constructing Scalable Superhydrophobic Membranes for Ultrafast Water–Oil Separation

Microporous Formation Mechanism of Biaxial Stretching PA6/PP Membranes with High Porosity and Uniform Pore Size Distribution

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

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