JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yaning Li,Boliang Wang,Zhiwei Han
The preparation and energy release mechanism of highly reactive n-Al/F-polymer metastable intermixed composites are both desirable and challenging. In this study, we employed an optimized electrospray sampling strategy to significantly enhance the reaction activity of aluminum-based MICs, as well as their combustion performance. It is evident that the optimization of the sampling strategy yielded remarkable results. Compared to the physical mixture, MICs-1 exhibited a 7.2-fold and 9.9-fold increase in P max and P max /Δ t , respectively. The combustion rate experienced an 8.5-fold improvement, and the energy release efficiency rose from 52.18 % to 68.11 %. An analysis of the energy evolution mechanism reveals a mitigation of the reactive sintering phenomenon observed in MICs-1. The presence of PVDF facilitates the reactivity of aluminum powders by selectively corroding the alumina shell. The reaction kinetics parameters indicate that MICs-1 demonstrates characteristic three-step reaction behavior and exhibits a lower reaction energy barrier. Furthermore, ReaxFF molecular dynamics simulations demonstrate the adsorption and dissociation of PVDF on the surface of aluminum powders, leading to erosion defects in the alumina crystal structure. These defects, in turn, induce the ignition reaction.
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Shengdong Tao,Jian Li,Lihua Wang,Weiguo Huang,Minchao Zhang,Zhexi Chi,Shuohan Wang,Yongzhi Chen,Lei Shang
Development of an active filler with a large specific surface area, fast ion conductivity phase, special shape, and high electrochemical stability is a critical issue for prominent performance composite solid-state electrolytes (CSEs) in solid-state lithium-ion batteries. Here, we report large specific surface area and coral-like cubic Li7La3Zr2O12 (LLZO) that was synthesized via a metal–organic framework (MOF) at a low calcination temperature (1000 °C). As active fillers, the coral-like cubic LLZO and lithium oxalyldifluroborate (LiODFB) uniformly distributed in a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix provide an interconnected Li-ion transport channel in CSE, which manifests outstanding properties such as a favorable electrochemical stability window (of 4.85 V vs Li/Li+), high ionic conductivity (1.65 × 10–4 S cm–1, 20 °C), and superior interface compatibility with lithium metal. The assembled LiFePO4/CSE/Li and LiCoO2/CSE/Li cells convey predominate performance and initial specific capacities of 135.0 and 135.9 mA h g–1 at 0.5 C, with capacity retention values of 83.51% after 500 cycles and 93.90% after 200 cycles. The coral-like LLZO with a large specific area reduces polymer crystallinity and provides a large phase interface in CSE through interaction of LLZO with LiODFB and PVDF-HFP. The results suggest that coral-like LLZO prepared by MOFs is a promising filler in CSEs for solid-state lithium-ion batteries.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xiaojia Zhao,Junjie Fu,Fangqian Yin,Chaoqun Li,Yuyang Xu,Guirong Peng
A one-step co-deposition method based on dopamine and hydrophilic hydroxyethyl methacrylate (HEMA) was proposed for the modification of polyvinylidene fluoride (PVDF) membrane, which could ameliorate its oil-water separation performances and hydrophilicity. A range of modified membranes were prepared by adding different content of HEMA in the reaction solution. For the improved membrane, the minimum water contact angle can reach 13.63°, and the maximum underwater oil contact angle can reach about 150°. The pure water flux for the improved membrane reaches 9668 L·m -2 ·h -1 ·bar -1 , showing excellent hydrophilicity. In addition, the separation efficiency of the improved membrane for a variety of oil-water emulsions exceeds 98%, indicating good permeability and circulating oil resistance. At the same time, this approach is also applicable to other membranes on account of the extensive availability of dopamine.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 9
·12001-12016
·
IF 2.478
Qian Guoming,Zhu Kongjun,Li Xia,Yan Kang,Wang Jing,Liu Jinsong,Huang Weiqing
Pb 0.8 Ba 0.2 ZrO 3 (PBZ) nanofibers were prepared through electrospinning and mixed at a volume composite ratio of 0–6% with polyvinylidene fluoride (PVDF) dissolved in an organic solvent, and the PBZ/PVDF composite film was prepared through casting. The nanocomposites with PBZ nanofibers of 3 vol% showed the best ferroelectric performance in this work, and the maximum polarization value and breakdown field strength were 9.69 μC/cm 2 and 420 MV/m, respectively. The dielectric constant and dielectric loss at a depolarization temperature of 285 K were 6.13 and 0.21, respectively. The performance of the electrocaloric effect was studied using the direct method near room temperature. Under 150 MV/m and − 30 °C, the △ T and Δ S of the composite film were 13.99 K and 52.70 J/kg K, respectively. When the temperature increased to 70 °C, △ T and Δ S become 5.08 K and 13.56 J/kg K, respectively. The simulation results and experiments indicate that the incorporation of nanofibers can increase the interface polarization with higher polarization value and improve the ferroelectric performance than pure PVDF.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Chuqing Tang,Honggui He,Enjie Wu,Heyi Li,Yinghe Hu,Chang Liu,Xiaoyin Wang,Xupin Zhuang
Passive daytime radiative cooling technology offers a sustainable solution for building energy conservation. However, its practical implementation faces significant challenges in regions with substantial diurnal temperature variations, particularly concerning excessive nocturnal cooling. This study presents the development of polyvinylidene fluoride (PVDF) aerogels with engineered hierarchical porous structures that effectively address these limitations through integration of radiative cooling and thermal insulation mechanisms. The PVDF aerogels exhibit a sophisticated multi-scale structural system, including dual-scale pore distributions at nanometer (0.2-0.8 μm) and micrometer (2-4 μm) scales enable efficient solar spectrum scattering; abundant C-F groups at the molecular level demonstrate superior vibrational absorption characteristics within the atmospheric window (8-13 μm), resulting in enhanced infrared emission; and the mesostructured nano/micro-scale reticulated skeleton significantly augments thermal insulation performance. This hierarchical structural design endows the materials with exceptional optical and thermal properties, including solar reflectance of 96.7%, mid-infrared emissivity of 97.6%, and thermal conductivity of 0.033 W/(m·K). In practical applications, the aerogels demonstrate remarkable temperature regulation capabilities: achieving cooling of 12.1°C under solar intensity of approximately 1200 W/m², while maintaining internal temperature at 7°C even when external temperature drops to 4°C, fully demonstrating the synergistic effects of radiative cooling and thermal insulation. This study presents an innovative solution for achieving all-weather, low-energy building thermal management, contributing to sustainable architectural development.
研究领域:
材料科学
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能源工程
·
建筑设计
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yanmei Wu,Hong Zhang,Yilin Xu,Zhiruo Tang,Zhicheng Li
PVDF-based electrolytes are promising candidates for solid-state lithium batteries (SSLBs) due to their high safety, interface compatibility and electrochemical stability. However, the low ionic conductivity of PVDF and uncontrollable dendrite growth in the related SSLBs restrict their development and application. Herein, ferroelectric BiFeO3 is introduced into PVDF to improve its electrolyte performance. The developed PVDF-based composite electrolytes achieve a high ionic conductivity (1.39 × 10−4 S cm−1) and Li+ transference number (0.35). Benefitting from the introduced BiFeO3, the assembled Li symmetrical batteries exhibit good cycle performance and can steadily cycle for 2500 h at 0.1 mA cm−2, at 25 °C. Matched with LiNi0.8Co0.1Mn0.1O2 cathodes, the assembled batteries show excellent long-term cycling stability with a capacity retention of 94% after 100 cycles at 0.1C and capacity retention of 89% after 400 cycles at 0.3C. The ferroelectric effect of BiFeO3 restrains the inhomogeneous electric field and adjusts the Li+ distribution at the electrolyte/electrode interface, achieving uniform Li deposition. The ferroelectric BiFeO3 powder facilitates the decomposition of lithium salts and regulates the chemical composition of the solid electrolyte interphase (SEI).
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Kaiyu Feng,Yan Zhang,Xuefan Zhou,Yan Zhao,Hanyu Gong,Xiang Zhou,Hang Luo,Dou Zhang,Chris Bowen
Powder-based piezoelectric catalysts have been widely examined due to their high catalytic activity for applications such as water treatment and dye degradation. However, challenges remain which are associated with secondary pollution as a result of employing a powder-based catalyst. While the use of bulk catalysts can overcome this challenge, their catalytic activity has been shown to decrease significantly compared to fine-scale catalytic powders. In this study, a simple, efficient, cost-effective and in situ approach is developed that is able to successfully retrieve a powder-based catalyst by coating catalytic particles with dopamine and exploiting the interaction between dopamine and a porous polyvinylidene fluoride (PVDF) substrate to collect the catalytic particles. Detailed characterisation and molecular dynamics modeling are used to determine the mechanisms of the chemical interactions and piezocatalysis. The universality of this new approach is demonstrated by conducting a range of experiments with a range of ceramic particulates, catalyst morphologies and potential dyes. Using this new strategy, we demonstrate the ability of ferroelectric particles to achieve a high piezocatalytic activity while being anchored onto a porous PVDF layer, thereby limiting secondary pollution. This work therefore provides a novel approach for the retrieval of powder-based catalysts, with potential to expand their application potential to other forms of powder-based catalysts.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·026407
·
IF 1.929
Dashuai Zhang,Yan Zhang,Xiaopeng Zhang,Chen Li,Lili Wang,Tianyi Shun,Hongting Wu,Qiang Lin,Zaifeng Shi
In this study, novel physical blending modified membranes are prepared using the non-solvent induced phase separation method, the influences of nano-graphite and Poly(vinyl chloride) (PVC) incorporated into the hydrophobic performance of the polyvinylidene fluoride (PVDF) membrane were investigated. The composite membrane was prepared not only reduces the cost of producing PVDF membrane, but also enhances the hydrophobicity of the membrane. The addition of nano graphite and PVC accelerated the phase transformation of PVDF and changed the crystal structure of PVDF. Therefore, the surface roughness of the composite membrane is changed, and the hydrophobicity of the composite membrane is enhanced compared with the original PVDF membrane. the crystal structure and crystallinity of the composite membranes can be analyzed by WAXD and DSC, the surfaces morphology of the composite membranes were characterized by SEM and AFM, the wetting and hydrophobicity of the composite membrane by CA and SFE. The experimental results show that adding a small amount of nano inorganic substance (nano graphite) to the (PVDF-PVC) blend polymer is an effective method to prepare and improve the hydrophobic performance of the blend polymer membrane. The PVDF-PVC/nano-graphite prepared in the experiment not only improves the hydrophobic performance of the PVDF membrane, but also reduces the cost of the composite membrane through the addition of PVC. Meanwhile, the membrane has a durable self-cleaning performance, which widens the applications of PVDF membranes.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Ze Zhang,Ping Fang,Jinghua Song,Longtao Zhu,Chaoyang Song,Enran Fan
Dye-containing wastewater causes severe environmental pollution, posing a major challenge to existing water treatment methods. Advanced dye separation technology has emerged to solve this problem. Conventional polyvinylidene fluoride (PVDF) membrane is susceptible to fouling during dye removal due to its low surface free energy and strong hydrophobicity. To improve the hydrophilicity of PVDF, nanofibrous membranes with multilevel roughness are prepared by electrostatic spinning using chitosan (CS) and PVDF-nano-zinc oxide blended solution as raw materials. The adsorption performance of the membranes is evaluated when the ZnO content varies from 0 to 1.2 wt%. When the optimized membrane is used to treat Rhodamine B wastewater, its flux and retention rate reach 580.42 L•m −2 •h and 96.33%, respectively (43.94% and 30.12% higher than those of a blank membrane). The flux recoveries are 69.67% for methyl orange and 67.35% for Rhodamine B (25.83% and 36.03% higher than those of a blank membrane, respectively). The irreversible fouling degrees are 30.33% for methyl orange and 32.65% for Rhodamine B, significantly lower than those of a blank membrane (70.51% and 70.07%, respectively).
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 9
·095502
·
IF 1.929
Guo-Yi Li,Hong-Di Zhang,Kun Guo,Xing-Sheng Ma,Yun-Ze Long
Piezoelectric materials such as ZnO semiconductors and polyvinylidene fluoride (PVDF) have been extensively studied to produce flexible wearable devices, providing a viable method for energy collection. In this study, PVDF was mixed with ZnO nanoparticles to prepare PVDF/ZnO devices by electrospinning. The composite ZnO affects the diameter of electrospun fibers and the output performance of the devices. As ZnO was added, the diameter of the fibers decreases, but the output current of the devices increases. Moreover, compared with pristine PVDF, the bending output current and pyroelectric current of the devices were improved after mixed with ZnO. The results indicated that PVDF/ZnO composite was a promising flexible device that can provide power for small electronic devices.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2018
·Vol. 60
·期 3
·342-349
·
IF 0.729
Xiang Yanhui,Lin Haibo
Supercritical carbon dioxide (ScCO 2 ) was used as a physical foaming agent to prepare poly(vinylidene f luoride)/poly(N-vinyl pyrrolidone) (PVDF/PVP) microstructure material. The effects of foaming conditions including saturation pressure, foaming temperature and foaming time on PVDF/PVP foams morphology, thermal and electrical behavior were systematically investigated by scanning electron microscope, differential scanning calorimeter and broadband dielectric spectrometer. Small cell and low cell density were achieved at low pressure of 12 MPa, as increasing saturation pressure, the average cell size increased first, and then decreased. The competition between the cell growth and cell nucleation played an important role in average cell size, which was directly related to ScCO 2 processing conditions. With increasing foaming temperature, cell size was increased and cell density was decreased, in a nearly linear manner. The variation of foaming time was considered to be closely related to the time for cells to grow. Thus, the results revealed that the average cell size enhanced with extending foaming time. The thermal properties of PVDF/PVP composites are slightly inf luenced by foaming parameters, and the dielectric constant of PVDF/PVP composite foams decreased with increasing volume expansion ratio.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2020
·
IF 5.797
Gajula Prasad,Jun-Wei Liang,Wei Zhao,Yingbang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
The effect of a N,N-dimethylformamide (DMF)/acetone solvent system (3:7, 4:6, 5:5, 6:4, 7:3) and spinning medium (air and water) on the membrane morphology and the structure-property relationship were investigated. A facile method was optimized to generate a porous, polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone (4:6) solvent system in a water medium. The attenuated total reflection (ATR) - Fourier transform infrared (FTIR) results showed an increased β-phase compared to the pristine poly(vinylidene fluoride) (PVDF). The XRD and DSC results further confirmed that the co-existing α- and β-phases in the pristine PVDF were converted into a unique β-phase in the electrospun membranes. In addition, the solvent uptake percentage of the DMF/acetone (4:6) solvent system in a water medium (540) is much greater than that in an air medium (320), and over two times better than that of commercial polyethylene (PE) membranes (190). Similarly, the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone (4:6) solvent system in a water medium is higher than that of the air medium. This enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）