One-step electrospinning membranes with gradual-transition wettability gradient for directional fluid transport

Shen, Quan; Jiang, Yue; Guo, Shanzhu; Huang, Lin; Xie, Haibo; Li, Long

doi:10.1016/j.memsci.2021.120091

Cited by 18 publications

(12 citation statements)

References 48 publications

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“…When the liquid penetrates from the weak hydrophilic side to the strong hydrophilic side, a significant acceleration effect occurs. When the rear surface of the PEI/PIP-TMC membrane faced the feed solution and the front side faced the permeate solution, the hydrophilicity difference is conducive to increasing the flux of the NF membrane. , …”

Section: Resultsmentioning

confidence: 99%

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One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

Guo

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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To coordinate the trade-off between the separation and permeation of the nanofiltration membrane for the separation of Mg2+/Li+, we regulated poly(ethyleneimine)/piperazine interface polymerization parameters to construct a positively/negatively charged ultrathin Janus nanofiltration membrane at a free aqueous–organic interface. At the optimized interfacial polymerization parameters, 0.03 wt % of piperazine reacted with trimethylbenzene chloride prior to poly(ethyleneimine), forming a primary polyamide layer with fewer defects or limiting large-scale defects of the polyamide layer. The controlled subsequent reaction of poly(ethyleneimine) and trimethylbenzene chloride results in a Janus nanofiltration membrane, with one side enriched with the carboxyl groups, the other side enriched with the amine groups, and a dense polyamide structure in the middle. Under the optimum conditions, the positive potential of the rear surface of the prepared membrane was 14.57 mV, and the water contact angle reached 71.31°, while the negative potential of the front surface was −25.48 mV, and the water contact angle was 12.93°, confirming a Janus membrane with opposite charges and large hydrophilicity differences in the front and rear surfaces. With a high cross-linking degree, a 40 nm thick polyamide layer is 29.09% more thinner than the traditional polyamide membrane. The ultrathin Janus nanofiltration membrane showed an excellent separation factor (S Li,Mg of 18.26), stability, and water permeability flux (10.6 L·m–2·h–1·bar–1). The rejections to MgCl2, CaCl2, MgSO4, and Na2SO4 are measured above 90% at a nearly constant permeability of 10.6 L·m–2·h–1·bar–1, particularly stable rejections to MgCl2 and Na2SO4.

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Section: Resultsmentioning

confidence: 99%

“…When the rear surface of the PEI/PIP-TMC membrane faced the feed solution and the front side faced the permeate solution, the hydrophilicity difference is conducive to increasing the flux of the NF membrane. 38,39 3.3. Surface Morphology and Thickness of the Janus PEI/PIP-TMC NF Membrane.…”

Section: Optimized Preparation Of the Janus Pei/pip-tmc Nf Membranementioning

confidence: 99%

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

Guo

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Even so, people are still pursuing strategies with much lower cost, higher separation efficiency, and environmental protection to fulfill the advanced oil–water separation . Especially, as the oil–water separation occurs mostly between two phases’ interface, the design of membranes and the use of special wettability performance between the two phases both have been considered as promising approaches …”

Section: Introductionmentioning

confidence: 99%

“…13 Especially, as the oil−water separation occurs mostly between two phases' interface, the design of membranes and the use of special wettability performance between the two phases both have been considered as promising approaches. 14 Membrane separation technology, due to its excellent separation performance, 15,16 low consumption, easy operation, and environment-friendly characteristics, has attracted more and more attention in recent years. 17,18 For example, Feng et al 19 reported an "oil-removing" approach by adjusting the surficial wettability of a stainless-steel mesh with more than 150°water contact angle (WCA) and 0°oil contact angle (OCA).…”

Section: Introductionmentioning

confidence: 99%

A Strategy of End Anchoring to Poly(N-isopropylacrylamide) Chains for the Thermo-Driven Controllable Oil–Water Separation

Zhou,

Feng,

Huang

et al. 2024

ACS Appl. Polym. Mater.

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Poly(N-isopropylacrylamide) (PNIPAM) chain with catechol end group was designed and successfully synthesized by a reversible addition−fragmentation chain transfer (RAFT) procedure, and then, even via a simple one-step soaking method, it could be firmly grafted to many different substrates (e.g., a stainless-steel mesh, a nylon microfiltration membrane, an Al plate, and glass). Moreover, after the end anchoring, the formed thin and uniform coating of PNIPAM onto the surfaces of the stainless-steel mesh and the nylon microfiltration membrane would endow the surfaces with a valuable thermo-driven controllable separation ability for oil−water mixtures and emulsions, respectively. And below PNIPAM's lower critical solution temperature (LCST) (34 °C), the membranes exhibited hydrophilicity and underwater oleophobicity and thus can be used for the separation of a "light oil"/ water mixture and an O/W emulsion through a "removing water" process; meanwhile, above its LCST, the membranes show the opposite properties (hydrophobicity and oleophilicity) and thus are used to separate a "heavy oil"/water mixture and a W/O emulsion through a "removing oil" process. In addition, without changing the morphologies and pore sizes of the substrates, the membranes gave many excellent performances such as excellent recyclability, high separation efficiency and a thermo-driven controllable separation ability. So, the facile and effective strategy presented in this work that is suitable for the coupling of PNIPAM with various substrates would also supply an inspiration to the effect conjunction for heterogeneous materials of other functional polymers and substrates.

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“…MIP-βCP was used to produce a new electrochemical sensor to detect βCP; this molecule has excellent anti-inflammatory properties and can be found in plant extracts, oils, and resins [ 23 ]. On the other hand, PCL is a hydrophobic polymer [ 26 ], semicrystalline aliphatic polyester, and has good mechanical properties. PCL is suitable for electrospinning and has been extensively used to fabricate fibers incorporating nanoparticles for several applications [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Molecularly Imprinted Membrane Produced by Electrospinning for β-Caryophyllene Extraction

et al. 2022

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Molecularly imprinted membrane of β-caryophyllene (MIM–βCP) was fabricated incorporating β-caryophyllene molecularly imprinted polymer nanoparticles (βCP–NP) into polycaprolactone (PCL) fibers via electrospinning. The βCP–NP were synthesized by precipitation polymerization using the βCP as a template molecule and acrylic acid as a functional monomer in the proportion of 1:4 mol, respectively. Atomic force microscopy images and X-ray diffraction confirmed the nanoparticles’ incorporation into MIM–βCP. MIM–βCP functionalization was evaluated by gas chromatography. The binding capacity was 1.80 ± 0.05 μmol/cm2, and the selectivity test was performed with a mixing solution of βCP and caryophyllene oxide, as an analog compound, that extracted 77% of the βCP in 5 min. The electrospun MIM–βCP can be used to detect and extract the βCP, applications in the molecular sieve, and biosensor production and may also contribute as an initial methodology to enhance versatile applications in the future, such as in the treatment of skin diseases, filters for extraction, and detection of βCP to prevent counterfeiting of commercial products, and smart clothing with insect-repellent properties.

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One-step electrospinning membranes with gradual-transition wettability gradient for directional fluid transport

Cited by 18 publications

References 48 publications

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

A Strategy of End Anchoring to Poly(N-isopropylacrylamide) Chains for the Thermo-Driven Controllable Oil–Water Separation

Molecularly Imprinted Membrane Produced by Electrospinning for β-Caryophyllene Extraction

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One-step electrospinning membranes with gradual-transition wettability gradient for directional fluid transport

Cited by 18 publications

References 48 publications

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li+ and Mg2+

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li+ and Mg2+

A Strategy of End Anchoring to Poly(N-isopropylacrylamide) Chains for the Thermo-Driven Controllable Oil–Water Separation

Molecularly Imprinted Membrane Produced by Electrospinning for β-Caryophyllene Extraction

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Product

Resources

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One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺

One-Step Construction of the Positively/Negatively Charged Ultrathin Janus Nanofiltration Membrane for the Separation of Li⁺ and Mg²⁺