JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Linlin Zhou,Tao Yang,Chunyu Guo,Kang Wang,Enhui Wang,Laipan Zhu,Hailong Wang,Sheng Cao,Kuo-Chih Chou,Xinmei Hou
Piezoelectric silicon carbide (SiC) has been quite attractive due to its superior chemical and physical properties as well as wide potential applications. However, the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications. Here, flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators (PENGs) and stress/temperature/light sensors. The open circuit voltage ( V oc ) and the density of short circuit current ( I sc ) of the PENG based on the PVDF/5 wt% 6H-SiC composite fiber films reach 28.94 V and 0.24 µA cm –2 , showing a significant improvement of 240% and 300% compared with that based on the pure PVDF films. The effect of 6H-SiC nanoparticles (NPs) on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis. The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli. This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.
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高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Lu Jing,Weili Li,Chang Gao,Menglu Li,Weidong Fei
Large depletion of fossil fuels promotes the sustainable development of renewable energy. Polymer-based dielectric nanocomposites are widely utilized owing to their ultrafast charging–discharging rate and high power density in pulse power systems, smart grids, and other electrical devices. In this paper, completely new high-entropy oxide (Eu0.2Bi0.2Y0.2La0.2Cr0.2)2O3 (in short, E) nanofibers are fabricated, and the multilayered nanocomposites are prepared with electrospinning and layer-by-layer hot-pressing processes. A high energy density of 20.11 J cm–3 and an efficiency of 64% are achieved at 598.9 kV mm–1 in the trilayered nanocomposites. First, the enhanced entropy of the lattices leads to local polymorphic distortion, which, to a certain extent, limits the movements of long polymer chains, reduces the dielectric loss, and improves the breakdown strength of the nanocomposites. Moreover, for multilayered nanocomposites, the Schottky barrier forms with the direct contact between the electrodes and ferroelectric polymer. The difference in permittivity of the materials in contact with the electrodes leads to the difference in the barrier height around the interfaces, which results in a larger local electric field and a higher breakdown strength. Besides, the multilayered nanocomposites improve the rough interfaces between inorganics and organics and reduce the probability of dielectric breakdown. This work provides a new filling strategy and structural-layer design for the application of flexible dielectric materials.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Jiuyun Cui,Yibo Zhang,Yusong Pan,Jianjun Li,Atian Xie,Changguo Xue,Jianming Pan
Molecularly imprinted composite membranes are considered to be a promising technology for the selective separation of antibiotics in wastewater. However, membrane pollution still greatly limits the practical applications of these membranes, especially in oily wastewater. In this study, an anti-fouling zwitterion PVDF-imprinted composite membrane (SPICM) was synthesized using dopamine as the functional monomer and crosslinking agent in the imprinting process. First, sulfobetaine 8 was blended with a porous PVDF membrane via a surface segregation strategy. Next, dopamine self-polymerization provided effective recognition sites and endowed the membrane surface with high hydrophilicity . The SPICM used for emulsion separation and selective tetracycline hydrochloride (TC) in wastewater. The as-prepared SPICM was able to separate various emulsions under gravity with a high flux (626 L m −2 h −1 ) and separation efficiencies of up to 99%. This membrane achieved a TC separation efficiency of 88.3% in oily wastewater. Therefore, the design of SPICMs with good antifouling performance provides a new strategy for the highly selective separation of active components from oily wastewater.
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高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Li Shaofeng,Zhang Meilin,Sun Jian,Sun Jianping,Wang Ying
Polyvinylidene fluoride (PVDF) membranes are favored for their excellent properties. However, the inherent strong hydrophobicity of PVDF membranes limits their development in the field of water treatment. The objective of this study was to improve the performance of PVDF membranes using the self-polymerization, strong adhesion properties, and biocompatible effects of dopamine (DA). The PVDF/DA membrane modification conditions were simulated and optimized using response surface methodology (RSM), and the experimental design was used to investigate three main parameters. The results showed that the DA solution concentration of 1.65 g/L, the coating time of 4.5 h, the post-treatment temperature of 25°C, the contact angle decreased from 69° to 33.9°, and the pure water flux on the PVDF/DA membrane was higher than that on the original membrane. The absolute value of the relative error between the actual and predicted values is only 3.36 %. In the MBR parallel comparison test, compared with the PVDF/DA membrane, the total amount of extracellular polymers (EPS) of the PVDF membrane increased by 1.46 times and the polysaccharide increased by 1.56 times, which further showed that the PVDF/DA modified membrane had the excellent anti-pollution ability. Through Alpha diversity analysis, the biodiversity detected on PVDF/DA membranes was higher than that of PVDF membranes, which further proved its good bio-adhesion ability. These findings could offer a reference for the hydrophilicity, antifouling, and stability of PVDF/DA membranes, which would establish the foundation for the comprehensive applications in MBR.
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PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 1
·211
·
IF 5.3
Juanjuan Zhou,Wenying Zhou,Mengxue Yuan,Xinbo Dong,Jiebing Zhang,Xuejiao Zhang,Yanqing Zhang,Xiaolong Chen,Yanrong Chen,Xiangrong Liu
An insulating shell on the surface of conductive particles is vital for restraining the dielectric loss and leakage current of polymer composites. So as to inhibit the enormous loss and conductivity of pristine nickel (Ni)/poly(vinylidene fluoride)(PVDF) composites but still harvest a high dielectric permittivity (εr) when filler loading approaches or exceeds the percolation threshold (fc), pristine Ni particles were covered by a layer of titanium dioxide (TiO2) shell via a sol–gel approach, and then they were composited with PVDF. The impacts of the TiO2coating on the dielectric performances of the Ni/PVDF composites were explored as a function of the filler concentration, the shell thickness and frequency. In addition, the dielectric performances were fitted using the Havriliak–Negami (H–N) equation in order to further understand the TiO2shell’s effect on polarization mechanism in the composites. The Ni@TiO2/PVDF composites exhibit highεrand enhanced breakdown strength (Eb) but remarkably suppressed loss and conductivity when compared with pristine Ni/PVDF because the TiO2shell can efficiently stop the direct contact between Ni particles thereby suppressing the long–range electron transportation. Further, the dielectric performances can be effectively tuned through finely adjusting the TiO2shell’ thickness. The resulting Ni@TiO2/PVDF composites with highεrandEbbut low loss show appealing applications in microelectronics and electrical fields.Keywords:dielectric properties;metal;core–shell structure;polymer composites
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Caini Liu,Wenyi Wang,Yanling Li,Fangyan Cui,Chengcheng Xie,Liuyong Zhu,Bojin Shan
Hybrid ultrafiltration membranes of poly(vinylidene fluoride) (PVDF) and poly(ethylene glycol)-multi-walled carbon nanotubes (PMWCNTs) have been prepared via phase inversion method. Compared with pristine PVDF membranes, PMWCNT/PVDF hybrid membranes showed a significant higher water flux (384 L m −2 h −1 ), more stable rejection rate of bovine serum albumin (BSA) and better antifouling properties because of better hydrophilicity. Besides, the antifouling properties of PMWCNT/PVDF hybrid membranes can be further reduced applying a weak electric field (direct current, about 2 V cm −1 ). More important, PMWCNTs/PVDF membrane exhibited the lowest hemolysis ratio of 0.4% ever reported, which has improved the hemocompatibility and safety of blood. Moreover, after the introduction of weak electric field, the adhesion of red blood cells is minimized. This study shows that the novel PMWCNT/PVDF hybrid membranes have excellent antifouling ability and hemocompatibility which opens up a new field for the application of PVDF membranes.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Lingqing Jiang,Haian Xie,Yan Hou,Shan Wang,Yushuang Xia,Yang Li,Guo-Hua Hu,Quanling Yang,Chuanxi Xiong,Zhaodongfang Gao
Piezoelectric polymer composite films have attracted extensive attention due to their comprehensive characteristics such as low cost, good flexibility, mechanical property and excellent processability. Among the known polymers, poly (vinylidene fluoride) (PVDF) is an ideal piezoelectric polymer because the β -crystalline form of PVDF has the highest polarization per unit cell. However, initial PVDF mostly suffers from the lack of a β phase, restricting its potential applications. Few-layer MoS 2 is predicted to be strongly piezoelectric owing to the opposite orientations of adjacent atomic layers. In this work, we report an efficient approach to enhance the piezoelectric property of PVDF-based nanocomposites by combining few-layer MoS 2 with PVDF. The product yield for few-layer MoS 2 reached a value as high as 83.3% via a unique liquid-exfoliation technique. For a few-layer MoS 2 /PVDF composite film with 1 wt.% few-layer MoS 2 , a high piezoelectric performance enhancement of 360% was achieved compared with the initial PVDF film. In addition, due to the intrinsic lubrication of MoS 2 , the highest elongation of the piezoelectric composite film was found to be four times higher than that of the pure PVDF film.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Xi Chen,Yi He,Yi Fan,Guangyong Zeng,Liyun Zhang
The membrane filtration technology is considered as one of the most important approach for removal of hazardous substances from wastewater. Herein, we report a facile surface modification method for preparing a novel membrane via the codepositing tannic acid (TA), polyetheylenimine (PEI), and halloysite nanotubes (HNTs) on the surface of polyvinylidene fluoride (PVDF) membrane. The morphologies and chemical compositions of membrane were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), indicating that the membrane was successfully modified by TA/PEI/HNTs. Compared with pristine membrane, the coated membrane shows the improved hydrophilicity and pure water flux (PWF). The membrane modified by TA/PEI/HNTs achieves higher dyes rejection with 90.7%, 92.8% and 96.0% for direct yellow, direct red and direct blue, respectively. Moreover, the treated membrane exhibits excellent anti-fouling performance after several cycles. In addition, removal capacity for heavy metal ion can be enhanced by the as-prepared membrane with introducing the TA/PEI/HNTs coating. This work provides a facile strategy to carry out the hydrophilic modification of membranes. We hope the as-prepared membrane would have some practical applications for wastewater treatment.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 29
·17505-17515
·
IF 10.733
Tiantian Li,Qile Fang,Haibo Lin,Fu Liu
Solar steam generation has recently attracted intense attention due to its high solar energy efficiency. However, the state-of-the-art solar distillators are usually composed of solar absorption, water supply and thermal insulation accessories separately, which complicate the fabrication and utilization of the device. Here, a thin polymeric membrane with an asymmetric structure and asymmetric wettability is fabricated for simplifying the vapour generation device. The simplified membrane can integrate enhanced solar harvesting, insulating, water drawing, steam transpiration and self-floating properties in a piece of a polyvinylidene fluoride (PVDF) membrane. The top hydrophilic layer loaded with gold nanoparticles (AuNPs) or carbon black (CB) exhibits enhanced broadband light absorption due to the synergistic effect of AuNPs (or CB) and water. The bottom hydrophobic layer facilitated the heat confinement via reducing the heat conduction and minimizing the water pathway through a round edge. This integrative PVDF membrane shows superior performances compared with traditional complex solar steam generation devices. The simplified thin-film distillator allows us to reclaim purified water without recourse to any other accessories, e.g. insulating foam, water path paper or support.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Ling Ling,Min Xiao,Dongmei Han,Shan Ren,Shuanjin Wang,Yuezhong Meng
Porous composite membrane of polyvinylidene fluoride (PVDF)/sulfonic silica with high vanadium ions selectivity was fabricated for vanadium redox flow battery (VRFB) application. The porous PVDF membranes were first prepared as matrix via phase transfer method, followed by introducing sulfonic silica into the matrix via sol-gel process. The sulfonic silica filled in the pores can not only provide proton transfer carriers but also suppress the permeation of vanadium ions through the membrane. Moreover, the organic/inorganic composite can enhance the durability of the membrane. The morphologies of composite membranes (PVDF/SiO 2 –SO 3 H) were characterized by SEM technique. Finally, the fabricated composite membrane shows one order of magnitude lower vanadium ion permeability (1.12✕10 −7 cm 2 min −1 ) and 3 times higher ion selectivity compared with Nafion 115 at room temperature. The single cell assembled using the as-prepared composite membrane gives a Coulombic efficiency of 90.3% and an energy efficiency of 75.6% at a current density of 60 mA cm −2 , which is comparable with Nafion 115 (89.7% and 78.2%, respectively). This strategy could provide a simple way to design and fabricate an organic/inorganic composite membrane with high durability for the application in VRFBs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 15
·13112-13117
·
IF 2.324
Xu Pei,Ruan Gang,Cui Zhaopei,Ding Yunsheng
Polyvinylidene fluoride (PVDF) based nanocomposites with γ-oxo-pyrenebutyric acid-noncovalent modified multiwalled carbon nanotubes (denoted as PACNTs) and stearic acid-covalent modified MWCNTs (SACNTs) as nanofillers, were fabricated using solution-blending method and their dielectric properties were carefully investigated. γ-Oxo-pyrenebutyric acid (PA) or stearic acid (SA) can improve the dispersion of MWCNTs in PVDF matrix because of strong physical π–π interaction and the surface of MWCNTs grafted with SA respectively. The values of percolation threshold for PVDF/PACNTs and PVDF/SACNTs were determined to be 5.7 and 6.3 vol%, respectively. Higher dielectric permittivity and lower loss tangent of PVDF/PACNTs originates from remarkable interfacial polarization because PA have more contact area with MWCNTs and can reduce leakage current compared with SA.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Abdul Ghaffar,Lina Zhang,Xiaoying Zhu,Baoliang Chen
Graphene oxide (GO) membranes are robust and continue to attract great attention due to their fascinating properties, despite their potential issues regarding stability and selectivity in aqueous-phase processing. That being said, however, the functional moieties of GO could be used for membrane surface modification, while ensuring simultaneous removal and recycling of industrial organic dyes. Herein, we present a versatile porous structured polyvinylidene fluoride–graphene oxide (PVdF-GO) nanofibrous membranes (NFMs), prepared by using simple and straightforward electrospinning approach for selective separation and filtration. The GO nanosheets were distributed homogeneously throughout the PVdF nanofiber, regulating the surface morphology and performance of PVdF-GO NFM. The PVdF-GO NFMs possesses high mechanical strength and surface free energy (SFE), consequently resulting high permeation and filtration efficiency as compared to PVdF NFM. The selectivity (99%) toward positively charged dyes based on electrostatic attraction, while maintaining rejection (100%) for negatively charged dye from mixed solutions highlight the role of GO in PVdF-GO NFM, owing to uniform pores and negatively charged surface. In addition, the actual efficiency of NFMs could be recovered easily up to three consecutive filtration cycles by regeneration, thereby assuring high stability. The high permeation, purification and filtration efficiency, good stability and recycling of PVdF-GO NFMs are promising for use in practical water purification and applications, particularly for selective filtration and recycling of dyes.
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高影响因子
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