CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Yefeng Feng,Junquan Zhou,Peiyao Chen,Maolin Bo,Qihuang Deng
High permittivity and low dielectric loss play a crucial role in enabling the applications of polymer-based composite dielectrics bearing ceramic particles in promising energy storage devices. The well-designed synergy of the two types of ceramics with varying conduction ability can effectively balance the high permittivity and low dielectric loss in composites. In this study, we optimised the dielectric properties of novel poly (vinylidene fluoride) (PVDF)/Fe 2 TiO 5 (FTO)/graphite ternary composite films fabricated via solution casting technology. FTO pseudo-perovskite micro-particles with semiconducting features and rich ionic electric dipoles were used as the primary filler. Graphite micro-particles with high conductivity were used as an assistant filler. PVDF with rich ferroelectric domains was utilised as a polymeric matrix. High permittivity of the composites was attributed to both the mild PVDF/FTO and strong PVDF/graphite interface polarisation effects. Compared with PVDF/FTO binary composites, the ternary composites filled with low-content graphite exhibited significantly improved permittivity and slightly increased dielectric loss. Controllable low-level interface leakage conduction was responsible for the low conductivity and dielectric loss as well as the acceptable electric breakdown strength achieved in the ternary composites. The ternary composite bearing 20 wt% FTO and 0.1 wt% graphite showed a high permittivity of ~45 at 100 Hz, low dielectric loss of ~0.15 at 100 Hz, and high breakdown strength of ~225 MV m −1 . We believe that this study will assist in facilitating the development of novel composite dielectrics containing semiconducting A 2 BO 5 pseudo-perovskite ceramic fillers.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2019
·
IF 1.795
Feng Wang,Hongye Wang,Asghar Ali,Yimeng Zhang,Xiaoqiang Cui,Yang Liu
Herein, green luminescence poly-vinylidene fluoride (PVDF) encapsulated CsPbBr 3 nanocrystals (CsPbBr 3 @ PVDF) with full width at half maximum (FWHM) of 20 nm were successfully prepared through one-pot electrospray process. The as prepared perovskite spheres showed outstanding stability in water, and displayed low cytotoxicity, which were applied for cell membrane imaging.
研究领域:
材料科学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2019
·
IF 0
Zhihao Sun,Zhaoqian Yan,Rui Yin,Xiaoshuai Huang,Kaicheng Yue,Anran Li,Lei Qian
With tunable negative permittivity, flexible and collapsible films composed of polyvinylpyrrolidone modified graphene and poly(vinylidene fluoride) were fabricated by solution casting method. Interestingly, a secondary percolation behavior was observed from σ ac , and two percolation thresholds ranged from 3.75 to 6.25 wt% and 12.5 to 18.75 wt%, respectively. Meanwhile, the results indicated that the obtained composite films achieved negative permittivity at a lower GR content (3.75 wt%), which was ascribed to better dispersion of the modified GR in the matrix. The negative dielectric curves could be well in accordance with Lorentz model and Drude model, respectively. It was also first discovered that different types of negative dielectric behavior corresponded well to the two percolation phenomena of σ ac , which was ascribed to the different microstructures.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yue Shen,Zheng Li,Ying Liu,Jing Tao Wang
Polyvinylidene fluoride (PVDF) has attracted significant attention for its unique piezoelectric and ferroelectric properties. However, traditional processing primarily results in the non-polar α phase, limiting its applications. This study prepared PVDF films via solution casting followed by rolling at various temperatures to promote the transition to the β phase. High-temperature rolling significantly enhanced the β phase content, improved the microstructure and orientation of the films, and markedly enhanced the piezoelectric and ferroelectric properties. Particularly, the films rolled at 90 °C exhibited a higher relative content of the β phase, showing exceptional piezoelectric performance with a d 33 value of 26 pC/N and ferroelectric properties with a remanent polarization (P r ) of 13.69 μC/cm 2 . Additionally, hot rolling at higher temperatures notably improved the mechanical properties, enhancing both tensile strength and elongation at break. The optimized PVDF films present broad application prospects in areas such as sensors. This study provides a method and theoretical guidance for the preparation of high-performance PVDF-based functional materials.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Xuan Zhang,Zhuzhu Shao,Jintao Liu,Xingang Liu,Chuhong Zhang
Piezoelectric energy harvesters (PEHs) developed from electrospun polyvinylidene fluoride (PVDF) fibers offer flexibility and superior piezoelectric output, making them promising for self-powered systems and sensors. Nonetheless, the electromechanical conversion efficiency of conventional electrospun PVDF fibers is impeded by their limited pressure-strain range. Herein, elastic porous PVDF microspheres are introduced in-situ via electrospinning to craft a piezoelectric membrane with higher compressive strain. The PVDF microspheres are uniformly embedded between the fibers in a sandwich fashion, and their dimension is easily tunable by varying spinning solution's concentration. Moreover, the micropores on the PVDF microspheres created by removing pre-mixed SiO 2 template not only elevates the β crystal content of PVDF to 82.19%, but also improves the compressibility, significantly boosting the piezoelectric output. The microsphere alloyed PVDF PEH delivers a piezoelectric output of 33.0 V and a power density of 8 μW/cm 2 , over 5.8 times that of conventional electrospun PVDF membrane, and can consistently charge lithium-ion batteries. Our research unveils a novel strategic path to modify fiber structured PEHs, advancing their applications in self-powered systems. Graphical
研究领域:
材料科学
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能源工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ruiqi Che,Sha Cheng,Cheng Huang,Ming Liu,Zhongao Chen,Jin Han,Wen Chen,Pengchao Zhang
Lithium dendrites, growing during the charging and discharging processes, can pierce the separators and lead to internal short circuits, which is one of the main factors resulting in thermal runaway of lithium metal batteries (LMBs). In this work, we developed a poly(vinylidene fluoride) (PVDF)-based Janus separator with an ultrathin polypyrrole (PPy) layer towards efficiently suppressing lithium dendrite growth. The PPy layer with thickness of approximately 200 nm has Pyrrole-N with lone pairs of electrons, which can act as nucleation sites for lithium ions. As a result, lateral lithium deposition can be achieved on the anode, thus preventing the lithium dendrites from piercing the separators. Stable stripping/plating performance over extended cycling and a capacity retention rate of 76.8% after 1000 cycles have been achieved in the Janus PVDF/PPy separator-based Li//Li symmetric cells and Li//LiFePO 4 half cells, respectively. The development of Janus separators with conductive polymer layers presents a promising solution for improving the safety and electrochemical performance of LMBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 18
·9131-9137
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IF 5.968
Mimi Tao,Fu Liu,Lixin Xue
A method of obtaining a hydrophilic and antifouling poly(vinylidene fluoride) (PVDF) membrane is developed via in situ polymerisation of 2-hydroxyethyl methacrylate (HEMA) in PVDF solution and subsequent micro-phase separation. The immobilization of PHEMA in a PVDF membrane was verified by Fourier Transform Infrared Spectroscopy (FTIR) and 1H Nuclear Magnetic Resonance Spectroscopy (1H-NMR). X-ray Photoelectron Spectroscopy (XPS) studies further unveiled the enrichment of PHEMA on the PVDF membrane surfaces. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) images revealed that the modified membrane had a fibrous-like microstructure in the cross section and a porous top surface. Water contact angle measurement suggested that the modified membrane formed by in situ polymerisation and micro-phase separation possessed higher hydrophilicity than the control membrane formed by blending PVDF and pre-polymerised PHEMA. The protein fouling of the modified membrane was considerably alleviated and the dried membrane showed spontaneous wettability and excellent permeability. Based on Wide-Angle X-ray Diffraction (WAXD) and the above results, a possible membrane formation mechanism for the in situ polymerisation and subsequent micro-phase separation was proposed.
研究领域:
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
Nanomaterials
·
2016
·Vol. 6
·期 8
·152
·
IF 2.69
Zongjie Li,Weimin Kang,Huihui Zhao,Min Hu,Na Wei,Jiuan Qiu,Bowen Cheng
A novel polyvinylidene fluoride (PVDF) tree-like nanofiber membrane (PVDF-TLNM) was fabricated by adding tetrabutylammonium chloride (TBAC) into a PVDF spinning solution via one-step electrospinning. The structure of the prepared membranes was characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and pore size analysis, and the hydrophilic property and microfiltration performance were also evaluated. The results showed that the tree-like nanofiber was composed of trunk fibers and branch fibers with diameters of 100–500 nm and 5–100 nm, respectively. The pore size of PVDF-TLNM (0.36 μm) was smaller than that of a common nanofiber membrane (3.52 μm), and the hydrophilic properties of the membranes were improved significantly. The PVDF-TLNM with a thickness of 30 ± 2 μm showed a satisfactory retention ratio of 99.9% against 0.3 μm polystyrene (PS) particles and a high pure water flux of 2.88 × 104L·m−2·h−1under the pressure of 25 psi. This study highlights the potential benefits of this novel PVDF tree-like nanofiber membrane in the membrane field, which can achieve high flux rates at low pressure.Keywords:electrospinning;polyvinylidene fluoride;tree-like;nanofibers;microfiltration
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Changhong Lin,Yan Zhou,Yuming Yang
We first reported a strategy to prepare functional poly(vinylidene fluoride) (PVDF) membranes with excellent ultraviolet-absorbing property through chemically induced grafting. Herein, the polymerizable ultraviolet (UV) absorber 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone (BPMA) made by ourselves was grafted onto the PVDF chains that have been pretreated with tetraethylammonium hydroxide (TEAH) alkaline solution. Moreover, the effect of experiment conditions such as the alkali and monomer concentrations, alkali treatment time on the UV-absorbing property of the obtained PVDF-g-PBPMA membranes were studied in detail. The chemical structure of the modified membranes was confirmed by 1 H NMR, FT-IR and XPS measurements. Meanwhile, the thermal and UV-absorbing properties were characterized by TGA, DSC and UV-Vis spectrophotometer, respectively. The results indicated that BPMA side chains were successfully introduced onto PVDF backbones. Most importantly, the obtained PVDF-g-PBPMA membranes exhibited excellent UV-absorbing property. The transmittance of UV light at 300 nm decreased to as low as 0.02% and the UV light below 388 nm could be completely absorbed by the PVDF-g-PBPMA membrane made under optimal condition.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Bioengineering-Basel
·
2022
·Vol. 9
·期 4
·130
·
IF 5.046
Xuemei Ge,Shang Wu,Wen Shen,Lijuan Chen,Yan Zheng,Fen Ao,Yuanlan Ning,Yueyang Mao,Zhong Chen
In this work, gold nanoparticles (AuNPs) and curcumin drug were incorporated in polyvinylidene fluoride (PVDF) nanofibers by electrospinning as a novel tissue engineering scaffold in nerve regeneration. The influence of AuNPs on the morphology, crystallinity, and drug release behavior of nanofiber membranes was characterized. A successful composite nanofiber membrane sample was observed by scanning electron microscopy (SEM). The addition of AuNPs showed the improved as well as prolonged cumulative release of the drug. The results indicated that PVDF–AuNPs nanofiber membrane could potentially be applied for nerve regeneration.Keywords:electrospinning;polyvinylidene fluoride;gold nanoparticles;nerve regeneration
研究领域:
生物材料学
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医学工程
·
组织工程
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2246
·
IF 4.6
Cuichuan Zhang,Zhiqiang Lu,Bin Wu,Shu-Dong Jiang,Jiasheng Qian
Poly(vinylidene fluoride) was grafted with maleic anhydride through reactive extrusion by using diisopropyl benzene peroxide as an initiator and 9-vinyl anthracene as a stabilizer. Effects of various parameters on grafting degree were investigated including the amounts of monomer, initiator and stabilizer. The maximum extent of grafting achieved was 0.74%. The graft polymers were characterized using FTIR, water contact angle, thermal, mechanical and XRD studies. Improved hydrophilic and mechanical properties were observed for graft polymers.Keywords:PVDF;MAH;stem grafting;melt extrusion
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 6
·1111-1121
·
IF 0
Junjie Li,Xin Hu,Guoxin Gao,Shujiang Ding,Huayi Li,Lanjun Yang,Zhicheng Zhang
For potential application in high energy storage capacitors with high energy density and low energy loss, three sets of poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] grafted with poly(methacrylic ester)s, including poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA) and poly(butyl methacrylate) (PBMA) copolymers, are designed and investigated carefully. Due to their intermediate polarity, relatively high glass transition temperature, and excellent compatibility with PVDF chains, the poly(methacrylic ester) segments introduced could not only dramatically weaken the coupling interactions of oriented polar crystals, but could also accelerate the reversal switching of polar crystal domains along the applied electric field, which leads to well hindered remnant polarization. As a result, the displacement–electric field (D–E) hysteresis behaviors of the graft copolymers could be tuned from typical ferroelectric to either antiferroelectric or linear shape under high electric field. Meanwhile, significantly reduced energy loss and effectively improved energy discharging efficiency were obtained. Compared with PMMA and PBMA, PEMA with intermediate polarity and grafting length exhibits more suitable confinement of the F–P transition of P(VDF-TrFE-CTFE), and thus more desirable energy storage properties are observed in the resultant copolymers. These findings may help to deeply understand the ferroelectric nature of PVDF based fluoropolymers and design new energy storage capacitor materials with high discharged energy density and low energy loss.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
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