POLYMER
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2018
·
IF 3.483
Zhaoliang Cui,Yangming Cheng,Ke Xu,Juan Yue,Yue Zhou,Xiaogang Li,Qian Wang,Shi-Peng Sun,Yong Wang,Xiaozu Wang,Zhaohui Wang
Poly(vinylidene fluoride) (PVDF) membrane is widely used in water purification and wastewater treatment. In present paper, thermally induced phase separation (TIPS) was employed, and maleic acid dibutyl ester (DBM), a new diluent, was introduced for PVDF membrane preparation. Phase diagram and the effects of polymer concentration and quenching temperature on the structure, morphologies, properties, and performances of PVDF membranes were investigated. During the quenching process of PVDF/DBM system, liquid-liquid phase separation happened, and PVDF membranes with a bi-continuous structure were fabricated. What is interesting is that the liquid-liquid phase separation region was much wider than other PVDF/diluent systems. Thus, it is possible to fabricate PVDF membrane with a bi-continuous structure at high polymer concentrations, without stretching or additives. With the increase in polymer concentration and quenching temperature, mean pore size and pure water flux of the PVDF membrane decreased. Tensile stress of the prepared PVDF membranes reached to 6.18 MPa, because the wide liquid-liquid phase separation region induced a bi-continuous structure when the concentration of the PVDF membrane was at around 30%.
研究领域:
材料科学
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环境工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Xinzhen Zhao,Jing Li,Changkun Liu
The physical and chemical characteristics of the porous supporting layer play a key role in the separation efficiency and concentration polarization of the forward osmosis (FO) membranes. In this paper, the modified polyvinylidene fluoride (PVDF) porous membranes with high porosity and large amounts of surface membrane pores were prepared with zinc oxide (ZnO) nanoparticles as the template, and used as the supporting layer of the FO membrane. The modified FO membranes showed enhanced water permeability and separation selectivity . The increased water flux was based on the increase of the effective membrane area , and the decreased τ/ε (tortuosity factor/porosity) value obviously alleviated the concentration polarization phenomenon based on the optimization of the flow channel. The etching of the porous microstructure could reduce the limit of the supporting layer on the separation performance of the FO membrane, and provide a simple method to improve the separation efficiency of the thin film composite (TFC)-type FO membranes.
研究领域:
膜科学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 3
·640-647
·
IF 5.819
Xueye Wang,Yu Guo,Tianlin Wang,Xingran Zhang
Silver nanoparticle-based membranes have been explored to enhance antibiofouling performance in water and wastewater treatment. However, their overall performance such as the toxicity to microorganisms in addition to antibiofouling behaviours is not adequately addressed. In this study, novel Ag-immobilized silica nanopollens (Ag@Snp) were combined with polyvinylidene fluoride (PVDF) membranes, which can mitigate fouling in membrane bioreactor (MBR) operations. The antibiofouling behaviours were systemically investigated and the effects of membranes on both sludge activity and bacterial community were evaluated. Long-term operation (75 d) revealed that decoration of Ag@Snp on the membrane surface had compelling antibiofouling behaviours without compromising the effluent quality, activated sludge activity and microbial community diversity. The operation cycle of the test MBR (R2, 32 ± 17 d) was much longer than that of a pristine membrane in the control MBR (R1, 16 ± 7 d). Meanwhile, compared to those in R1, the dehydrogenase activity and specific oxygen uptake rate hardly varied in R2, suggesting that release of silver ions from membranes might have a limited toxic impact on the sludge flocs. The long-term nanosilver exposure did not significantly affect the structure and diversity of microorganisms in the MBR system. The findings of this study would underpin the potential application of the silver-based antibiofouling membrane in MBRs for wastewater treatment.
研究领域:
环境工程
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水处理技术
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微生物学
✓ 已验证
DOI
高影响因子
FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 9
·2511-2516
·
IF 2.347
Song Mengqi,Zhao Qian,Wang Xiuting,Shi Chuan,Hu Xiao,Li Jiwei
In this study, an asymmetric wettable composite wound dressing consists of hydrophobic polyvinylidene fluoride (PVDF) outer layer and a hydrophilic polydopamine (PDA) coated Ag nanoparticles (Ag NPs)/PVDF layer (PVDF-Ag-PDA) was successfully prepared through electrospinning and PDA coating. The results show that the contact angle of the PVDF surface is 132.8°, while the PDA-coated surface is nearly 0°, indicating an asymmetric wettability. The highly hydrophilic PVDF-Ag-PDA layer can significantly reduce bacterial growth, while the PVDF layer with a small pore size and high hydrophobicity can prevent bacterial adherence. In addition, cytotoxic assays showed that PVDF/PVDF-Ag-PDA present a high cell viability percentage (above 80 %), which is attributed to that the thin layer of PDA can alleviate the cytotoxicity of Ag NPs. Therefore, the Janus wound dressing noted as PVDF/PVDF-Ag-PDA has the potential for practical applications with the advantages mentioned above.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
伤口愈合
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Ping Su,Dong Zhang,Minghui Zhu,Tengteng Liang,Nan Yang,Huaihao Zhao,Dafeng Zhang,Junchang Liu,Peiqing Cai,Xipeng Pu
Piezoelectric materials have advantages of fine-tuning photocatalytic performance through harvesting mechanical energy and open a new avenue in facilitating green catalytic reaction. Herein, polyvinylidene fluoride (PVDF), a flexible piezoelectric material, was introduced to synthesize a novel Cd 0.9 Zn 0.1 S-ZnO@C/PVDF (CZS-ZO@C/PVDF) piezo-photocatalytic film by spin coating and immersion phase conversion method. Benefiting from the piezoelectricity of PVDF and the internal electric field (IEF) of CZS-ZO@C Step-scheme (S-Scheme) heterojunction, CZS-ZO@C/PVDF was able to induce a hydrogen generation rate of 34.9 mmol g −1 h −1 activated by ultrasound and visible light (U-L), which is ∼17.5 times of Cd 0.9 Zn 0.1 S/PVDF (CZS/PVDF) and ∼7.4 times of the photocatalysis rate activated by visible light only (L). Piezoelectric measurements and COMSOL simulation illustrated the excellent piezoelectricity of CZS-ZO@C/PVDF film, which exhibits a piezoelectric coefficient ( d 33 ) of 9.9 pm V −1 and a piezoelectric potential of 874 mV (under 0.5 MPa). The reaction mechanism for the exceptional piezo-photocatalytic performance was finally disclosed through density functional theory (DFT) calculation and electrochemical tests. This study enriches the application scope of piezoelectric materials in sustainable energy catalysis and provides a new direction to develop efficient piezoelectric photocatalysts.
研究领域:
材料科学
·
催化
·
可再生能源
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Wenting Zhou,Yuanmiaoliang Chen,Dejun Feng,Lu Xiao,Xianhui Li,Zhangxin Wang
Membrane wetting induced by liquid absorbents severely hinders the practical applications of a gas–liquid membrane contactor (GLMC) for carbon dioxide (CO2) capture. To overcome this challenge, membranes with enhanced wetting resistance have been developed, but their CO2 absorption rates have often been overlooked. Herein, we unveil the interplay between membrane wetting resistance and the CO2 absorption rate for different GLMC membranes and elucidate the underlying mechanisms. Specifically, two representative membranes were used in this study: a polyvinylidene fluoride (PVDF) membrane with interconnected pores and an anodic aluminum oxide (AAO) membrane with disconnected pores. For each membrane, we modify it using fluoroalkyl silane agents with different chain lengths to obtain a range of membranes with different wetting resistances. Through GLMC tests, we identify a trade-off between membrane wetting resistance and the CO2 absorption rate for the PVDF membranes, i.e., an enhanced wetting resistance leads to a lowered initial CO2 flux. In contrast, for the AAO membranes, the CO2 absorption rate is independent of the membrane wetting resistance. Using electrochemical impedance and ultrasonic time-domain reflectometry analysis, the interplay between membrane wetting resistance and the CO2 absorption rate can be explained by the change of the gas–liquid interfaces in the GLMC membranes. This study reveals the critical role of the gas–liquid interface in GLMC for CO2 capture, providing valuable insights into membrane development for environmental applications of GLMC.
研究领域:
环境工程
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 27
·13952-13961
·
IF 5.1
Xin Zhen,Jian Wang,Xinhui Li,Yanda Jiang,Zhi Li,Zhonghui Shen,Xin Zhang
The pursuit of high-temperature dielectric polymers with superior energy density is a critical objective in the development of advanced electronic and electrical systems. However, existing polymers capable of operating at elevated temperatures often suffer from a low dielectric constant and excessive conduction loss. Herein, we present an all-polymer composite with exceptional high-temperature energy storage performance, wherein polyvinylidene fluoride (PVDF) nanofibers are precisely aligned within a polyetherimide (PEI) matrix. The PEI/PVDF composites exhibit an enhanced dielectric constant compared to PEI due to the intrinsically higher dielectric constant of the PVDF component and interface effects between PEI and PVDF components. Moreover, the alignment of PVDF nanofibers achieves a perpendicular orientation to the applied electric field, contributing to enhanced breakdown strength. The resultant PEI/PVDF composites with optimized content and diameter of PVDF nanofibers in the PEI matrix achieve a discharge energy density of 9.39 J cm−3 at 150 °C with the energy efficiency (η) exceeding 90%. This research presents a simple, economical, and scalable method for producing dielectric polymer films with excellent energy storage capacity at high temperatures.
研究领域:
材料科学
·
储能技术
·
聚合物工程
·
介电与绝缘
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Longben Huo,Hui Feng,Jiwei Cui,Ying Zhu,Lingyun Zhu,Xin Jin,Xinyuan Zhu
Polyvinylidene fluoride (PVDF) latex nanoparticles serve as a versatile platform for surface modification due to their role as precursors in PVDF manufacturing. However, the strong chemical stability and poor compatibility of PVDF present significant challenges for effective surface modification. To address this, we developed a method that facilitates surface modification through chain entanglement. By employing monomer swelling emulsion polymerization, poly(meth)acrylate (PA) monomers are incorporated into PVDF nanoparticles and subsequently polymerized. Rheological properties and transmission electron microscopy mapping confirmed the chain entanglement between PVDF and PA, indicating a successful integration. This method is efficient, straightforward, and highly adaptable, making it well-suited for large-scale industrial production.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 6
·2503-2515
·
IF 3.442
Li Jianan,Chen Guanliang,Lin Xiujuan,Huang Shifeng,Cheng Xin
Dielectric nanocomposites have attracted extensive attention since the potential application in the field of energy storage. Nevertheless, it is still a challenge to fabricate dielectric nanocomposites with high discharged energy density. Herein, lead-free bismuth sodium titanate (BNT) particles are used as filler in nanocomposite due to their outstanding dielectric properties. In this paper, BNT nanoparticles decorated by dopamine were employed to fabricate BNT@Dopa/poly(vinylidene fluoride) (PVDF) nanocomposites. Dielectric properties and energy storage performance of nanocomposites with BNT nanoparticles enhanced significantly. The maximum dielectric constant ( ε r ) of nanocomposites with BNT@Dopa nanoparticles was 14.15 at the frequency of 1 kHz. The discharged energy density ( U dis ) of nanocomposites with 3 vol% BNT@Dopa nanoparticles reached 13.09 J/cm 3 at 430 kV/mm. The energy efficiency ( η ) of nanocomposites at 40 °C remained 53.62% at the electric field of 350 kV/mm. The nanocomposite with BNT@Dopa nanoparticles performed excellent fatigue endurance after 10 6 cycles. These results offer a practicable way to fabricate nanocomposites with high energy density.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Yue Zhang,Qingguo Chi,Lizhu Liu,Tiandong Zhang,Changhai Zhang,Qingguo Chen,Xuan Wang,Qingquan Lei
The dielectric polymer-based films with excellent energy storage properties have been considered as potential candidates for flexible capacitors. In this study, the hierarchical gradient structures of the 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 nanofibers (BZCT NFs) are designed in the polyvinylidene fluoride (PVDF) composite films. The composite films with different compositions of BZCT NFs gradient structure were prepared by layer-by-layer electrospinning, hot-pressing, and quenching processes. The microstructures and electrical properties have been studied, and the results indicate that the BZCT NFs gradient structures can simultaneously improve the polarization and the breakdown strength of the PVDF-based composite films, leading to the enhancement of energy storage density (9.8 J/cm3) compared to that of pristine PVDF films (4.2 J/cm3). This work provides an efficient route to improve the energy storage properties of polymer-based composite films by structure modulation.
研究领域:
材料科学
·
电气工程
·
纳米技术
✓ 已验证
产品关联
DOI
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Hongli Xie,Binghong Chen,Hongjun Lin,Renjie Li,Liguo Shen,Genying Yu,Lining Yang
Continuous increasing discharge of industrial oily wastewater and frequent occurrence of oil spill accidents have taken heavy tolls on global environment and human health. Organic-inorganic modifications can fabricate superhydrophilic/submerged superoleophobic membranes for efficient oil-water separation/treatment though they still suffer from complex operation, non-environmental friendliness, expensive cost or uneven distribution. Herein, a new strategy regarding tannic acid (TA)-Ti(IV) coating and CaCO 3 -based biomineralization through simple inkjet printing processes was proposed to modify polyvinylidene fluoride (PVDF) membrane, endowing the membrane with high hydrophilicity (water contact angle (WCA) decreased from 86.01° to 14.94°) and underwater superoleophobicity (underwater contact angle (UOCA) > 155°). The optimized TA-Ti(IV)-CaCO 3 modified membrane possessed perfect water permeation to various oil/water emulsions (e.g., 355.7 L·m −2 ·h −1 for gasoline emulsion) under gravity with superior separation efficiency (>98.8 %), leading the way in oil/water emulsion separation performance of PVDF membranes modified with polyphenolic surfaces to our knowledge. Moreover, the modified membrane displayed rather high flux recovery after eight cycles of filtration while maintaining the original excellent separation efficiency. The modification process proposed in this study is almost independent of the nature of the substrate, and meets the demand for simple, inexpensive, rapid preparation of highly hydrophilic antifouling membranes, showing abroad application prospect for oil-water emulsion separation/treatment.
研究领域:
环境工程
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Weizhi Liu,Yongqiang Guo,Zhiwei Xue,Hao Sun,Xiaofeng Lin,Chao Liu
Polyvinylidene fluoride (PVDF) membrane is a cheap and commonly used separation material, but its inherent hydrophobicity results in significant membrane contamination, which limits its engineering application and further development. The hydrophilic PVDF-g/co-NVP membrane was prepared through low-dose γ-ray irradiation and using N-vinyl-2-pyrrolidinone (NVP) as a modifier in this study. The effects of γ-ray dose and incorporating NVP additive on the microstructure, hydrophilicity, anti-fouling capability, and mechanical capacity of membranes were discussed. Molecular dynamics (MD) simulation method was used to comprehensively investigate the impact of the NVP on the physicochemical characteristics of membrane structure. Under a specific NVP load, the water contact angle of the membrane decreases from 87.92° to 52.66°. The pure water permeance reaches 362.1 L/m 2 h, and the porosity increases to 55.21 %±1.29 %, which indicates that γ-ray irradiation with NVP addition can effectively adjust the pore structure and hydrophilicity of the membrane. During anti-fouling test against bovine serum albumin (BSA), the modified membrane exhibits remarkable anti-fouling characteristics, including reduced BSA accumulation, enhanced flux recovery, lower irreversible contamination level, and extended cleaning cycle compared with the original pure PVDF membrane because of its higher hydrophilicity and positive zeta-potential value. This study elucidates the mechanism underlying γ-ray graft modification of PVDF membranes, thereby providing valuable insights into the development of efficient functional membrane materials.
研究领域:
材料科学
·
环境工程
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）