INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Chen,Gang Chen,Fei Chen,Zixuan Zhang,Jie Wang,Zhengtang Su,Zhijun Zhou,Yilong Ma,Wei Cai,Rongli Gao
Combining magnetic and dielectric materials to form a composite can significantly improve its impedance matching and electromagnetic wave absorption performance. Furthermore, composite materials with a core–shell structure hold promise in meeting the demand for lightweight and highly electromagnetic-absorbing properties. In this study, uniform hexagonal flake barium ferrite (BaFe12O19) was prepared using the hydrothermal method. Subsequently, BaFe12O19@PVDF composites were synthesized by the sol–gel method. By adjusting the mass ratio of BaFe12O19 and PVDF, the shell size of the BaFe12O19@PVDF composite material was controlled, and its electromagnetic absorption performance was enhanced. The shell thickness of BaFe12O19@PVDF is 19.64 nm when the BaFe12O19: PVDF mass ratio is 1:1.0, and the optimal impedance matching is obtained at 13.4 GHz. Meanwhile, at a thickness of 1.5 mm, the minimum reflection loss (RLmin) reached −58.04 dB, and an effective absorption bandwidth (EAB) (RL ≤ −10 dB) of 5.53 GHz was achieved within the frequency range of 11.65 to 15.63 GHz and from 16.36 to 17.91 GHz. Besides, the composites with a matching thickness of 3.5 mm show a maximum EAB of 15.90 GHz when the mass ratio of BaFe12O19 to PVDF is 1:1.2. Within the frequency range of 2–18 GHz, the coverage of reflection loss less than −10 dB is 99.38%, almost achieving full coverage. These results demonstrate that BaFe12O19@PVDF composites exhibit excellent electromagnetic-absorbing performances, making them an excellent candidate for electromagnetic wave absorption in 5G communications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shuyi Chen,Noor Khatoon,Chen Zhang,Qi Zhang,Shuhong Jiang,Honghai Yang,Jun Wang
Selective recovery of recyclables is a major challenge when treating textile wastewater. For this reason, there is an urgent need to develop nanofiltration membranes with high permeability and selective filtration. In response, a novel composite PVDF loose nanofiltration membrane was developed by combining two different mixed amines system/dopamine (DA) followed by interfacial polymerization with benzoyl chloride (TMC). The two different amines systems were a mixture of GAZ and PEI and a mixture of PIP and PEI, respectively. The effects of GAZ/PEI and PIP/PEI on the microstructure was characterized by SEM, AFM, FTIR and XPS and performance of the membrane was also investigated. The effects of GAZ/PEI and PIP/PEI on the microstructure and the selective layer of membranes were different. The results stated that with the increase of GAZ/PEI the thickness of the selective layer, surface roughness decreased, while the fluxes of pure water and dye wastewater increased. However, with increasing PIP/PEI, surface nodules and roughness both increased. Contrarily, the thickness of the selective layer and PEG800 rejection first decreased and then increased, while the flux of pure water and the dye wastewater first increased and then decreased. The optimal GAZ/PEI and PIP/PEI were 9/91 and 50/50, respectively. When the GAZ/PEI was 9/91, the pure water flux and the RB5 wastewater flux were 20.7 L∙(m 2 ∙h) −1 and 11.5 L∙(m 2 ∙h) −1 . The dye (RB5) retention rate was 94.3% and salt retention rate was 2.1%. However, when the PIP/PEI was 50/50, the pure water flux and RB5 wastewater flux were 26.6 L∙(m 2 ∙h) −1 and 17.1 L∙(m 2 ∙h) −1 increased by 87.3% and 134.2% respectively. The retention rates of RB5 and NaCl were 96.3% and 1.7%. The above results indicate that the composite PVDF LNF membranes prepared with mixed amine monomers instead of single amine monomers have good selective filtration performance.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Jinli Zhao,Juan Li,Qingbai Chen,Mengwei Yang,Yongkang Li,Hong Li,Yuzhong Zhang,Jianyou Wang
The influence of crystallization behavior on membrane structure and performance has been extensively studied in many membrane fields. Some studies of proton exchange membranes used in fuel cells have involved the influence of crystallization. However, crystallization of ion exchange membranes (IEMs) used in electrodialysis (ED) has been rarely studied. Co-ion leakage in ED process is adverse, but there have been few mechanism studies regarding how co-ions cross IEM surfaces on the concentration chamber side and migrate into the dilution chamber to reduce current efficiency. Polyvinylidene fluoride is a kind of good crystalline material. In this study, sodium dodecyl benzene sulfonate was introduced as the functional material , with polyvinylpyrrolidone (PVP) as the hydrophilizing agent. They were blended to prepare cation exchange membranes (CEMs). Amorphous PVP was used to regulate membrane crystallization behavior. The results showed that, when the ion exchange capacity is basically equal, surface roughness of the prepared crystalline CEMs was low and the structure dense. The ED efficiency significantly surpassed amorphous CEMs. The co-ion leakage of amorphous CEMs was greater than those of crystalline CEMs due to the rough and non-dense surfaces of amorphous CEMs. However, after densification modification, although surface resistance increased, co-ion leakage was effectively suppressed. Combining simulation and theoretical analysis, it was presumed that dense membrane surfaces on the concentrated chamber side was very important for suppressing co-ion leakage. This study on the influence and mechanism of crystallinity and co-ion leakage was helpful for optimizing CEM mass transfer and improving current efficiency.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jinhao Gao,Hanwen Wang,Zhiyuan Gao,He Gui,Yanxin Wang,Jianguo Tang,Linjun Huang
The flexibility, wide response range, and ultra-high sensitivity of flexible sensors make them suitable forwearable technology, automated manufacturing, and robotics. The development of raw materials for flexible sensors and the design of their source layer structures can address a range of issues. In this article, we aim to develop flexible sensors for wearable technology by preparing MXene/PVDF@ZIF-8 multilayer nanofiber membranes through electrospinning technology. By incorporating ZIF-8 particles into PVDF fibers through in situ electrospinning technology, flexible sensors with a rough structure were obtained. We similarly employed vacuum filtration technology to introduce MXene nanosheets into PVDF@ZIF-8 nanofibers, further constructing a conductive network with a multidimensional structure in the vertical direction of the film. The performance of the prepared MXene/PVDF@ZIF-8 composite fiber membrane pressure sensor was tested, revealing its wide working range (0–125 kPa), high sensitivity (25.8–77.9 kPa -1 ), load/unload Time (20 ms/30 ms), and strong mechanical stability. Various human movements and lying postures were simulated, confirming that the sensor can effectively provide feedback on external pressure applied to the skin. This also demonstrates the broad application prospects of the flexible sensor in the field of flexible wearables.
研究领域:
材料科学
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传感器技术
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纳米科技
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 291
·期 7
·1573-1580
·
IF 2.161
Zhao Xuejuan,Zhang Jun,Chen Shuangjun,Wang Xiaolin,Wang Jianxin
The in situ polymerization of poly(ethylene glycol) methyl ether methacrylate (PEGMA) in poly(vinylidene fluoride) (PVDF) solution was carried out to prepare hydrophilic PVDF/PPEGMA blends. Based on T
g data, the system displayed some miscibility at low PPEGMA content because there were some interactions between PVDF and PPEGMA, as illustrated by Fourier transform infrared spectroscopy analysis, while the miscibility disappeared at high PPEGMA content. The β phase was the predominant crystalline phase of PVDF in the in situ blends, which was independent on PPEGMA content. However, the addition of PPEGMA could change the unit cell structure in the direction of the a -axis of β phase. The degree of crystallinity of the in situ blends calculated by wide-angle X-ray diffraction and differential scanning calorimetry displayed different tendencies with PPEGMA content. The scanning electron microscopy showed that the “spherulites” size increased with the increase in PPEGMA content, since the “spherulites” were comprised of not only crystalline PVDF but also amorphous PVDF and PPEGMA. In addition, the in situ blend had a great improvement in the hydrophilicity; specifically, its water contact angle was down to 26° when the PPEGMA content only increased to 26.9 wt.%.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 35
·49032
·
IF 2.52
Yupei Xian,Yonggang Shui,Meimei Li,Cunbao Pei,Qiyi Zhang,Yongyi Yao
Plenty of oily wastewater discharged from industrial and domestic sewage has deteriorated the environment severely, so stimuli-responsive membranes with switchable wettability have been of considerable attraction for its potential application in oil/water separation. In this work, a novel pH-dependent thermoresponsive membrane fabricated by grafting the poly[2-(diethylamino)ethyl acrylamide] (PDEAEAM) from the poly(vinylidene fluoride) (PVDF) membrane via surface-initiated atom transfer radical polymerization is explored to achieve the oil/water separation. The PDEAEAM- g -PVDF membrane shows hydrophilicity at room temperature under neutral condition while hydrophobicity at 50°C under alkaline condition. Wettability of the membrane at different temperatures is dominated by the lower critical solution temperature (LCST) of PDEAEAM, and the LCST of PDEAEAM is pH dependent. Due to the LCST of PDEAEAM, the membrane shows a variation of separation efficiency for separating hexadecane/water emulsion with temperature and pH. Typical separation efficiencies are 97.10% at 25°C under neutral condition and 30.26% at 50°C under alkaline condition.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Rehan Khan,Ihtisham Ul Haq,Heng Mao,Ao-Shuai Zhang,Li-Hao Xu,Hong-Gang Zhen,Zhi-Ping Zhao
Phenol is highly toxic and carcinogenic even at low concentrations. This study focused on preparing high-performance mixed matrix membranes (MMMs) for the pervaporation separation of phenol from its aqueous solution. A highly-efficient zeolitic metal azolate framework, RHO-[Zn(Heim) 2 ] (MAF-6, Heim = 2-ethylimidazole) was incorporated into the polyether block amide (PEBA-2533) supported on the polyvinylidene fluoride (PVDF) ultrafiltration membrane. The MAF-6 was chosen as the filler due to its inherent hydrophobic surfaces and aperture size (7.6 Å), which is larger than the molecular kinetic diameter of phenol (6.6 Å). Effects of the casting solution concentration, active layer thickness, MAF-6 loading, operating temperature, and phenol concentration were systematically investigated. With the increase of the MAF-6 loading ratio X from 0 to 7, the phenol flux of the membrane was gradually enhanced, but the water flux was reduced. For 1000 ppm phenol aqueous solution at 80 °C, MAF-6–7@MMM displayed the optimal separation factor of 25.9 with a phenol flux of 89.2 g∙m −2 ∙h −1 . The pervaporation separation index (PSI) of the MAF-6–7@MMM was 1317.7 kg∙µm∙m −2 ∙h −1 at 80 °C, which was much higher than the PEBA/PVDF membrane (787 kg∙µm∙m −2 ∙h −1 ). Impressively, an increasing feed temperature enhanced the phenol flux more prominently than water, owing to the hydrophobicity and porosity of MAF-6. Consequently, the resultant MAF-6-X@MMMs broke the trade-off limitation between phenol permeability and selectivity. The as-prepared membrane also exhibited exceptional long-term stability, suggesting its prospect of industrial application.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wanzheng Ren,Jian Pan,Wenqiang Gai,Xinyu Pan,Haimei Chen,Jiao Li,Lilan Huang
A crucial step in the purification and recycling of industrial waste oil is the separation and removal of trace water from emulsified oil. After optimizing the polymer content, solvent composition, and SiO 2 nanoparticle addition amount of the spinning precursor solution, a Polyvinylidene fluoride- co -trifluoroethylene chloride (PVDF-CTFE)/SiO 2 nanofibrous membrane with micro and nano-rough structure was prepared by electrospinning. Using scanning electron microscopy, a pore size analyzer, a contact angle tester, a single-fiber strength tester, and a gravity separation experiment, the influence of SiO 2 addition on the morphology, pore size distribution , wettability , mechanical, and separation properties of the modified membranes was characterized. The results demonstrated that the water contact angle of the nanofibrous membrane was increased to 151.3° of superhydrophobic when SiO 2 was added at a concentration of 2.5 wt%. The nanofibrous membranes exhibited outstanding separation performance (>99%) for water-in-oil mixtures and emulsions, as well as for various oil-water systems. Moreover, the PVDF-CTFE/SiO 2 nanofibrous membranes exhibited superior multi-cycle performance and consistent chemical resistance. This research yielded a novel material and a straightforward method for fabricating superhydrophobic nanofibrous membranes, which demonstrated greater application potential in oil-water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 1
·016437
·
IF 1.929
Linchen Liao,Caifeng Chen,Jilong Qian,Youming Zhang,Ruifang Zhang,Jiaguang Zhu
PVDF/IL piezoelectric film based on [Emim]BF4-added was prepared by near electric field direct writing. The β-phase content and its electric property of the film were analyzed. The results showed that the content of β crystal phase of PVDF film was improved by the synergistic effect of IL ([Emim]BF4) and near electric field. When the amount of [Emim]BF4 added was 1.5 wt%, the relative β-phase content of PVDF film reached 85.09%, and the crystallinity is 47.84%. Increase in [Emim]BF4 content resulted in a significant increase in the relative dielectric constant of the film, from 6 to 285, but also accompanied by a sharp increase in dielectric loss. The d33 value of the film can be as high as −10 pC/N, and the output voltage from the cantilever beam vibration feedback indicates that the voltage strength of the [Emim]BF4-added film is greatly improved compared with the pure PVDF film.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Qianqian Yu,Haijun Wang,Yisha Ma
With the rapid development of renewable energy systems and flexible electronics, polymer-based dielectric films integrating high energy density, superior charge-discharge efficiency, and multifunctionality have emerged as a critical frontier in materials science. In this study, we developed an interface-engineered PVDF/APTES@CsPbBr 3 organic-inorganic composite via an innovative in situ growth strategy of APTES-passivated perovskite quantum dots (QDs) within a PVDF matrix. The precisely controlled in situ synthesis enabled uniform QDs dispersion while establishing robust interfacial interactions. This synergistic design achieves dual enhancements by triggering pronounced polar-phase crystallization (>90 % β/γ-phase content) in PVDF to amplify dipole polarization and suppressing leakage pathways through QDs-induced nano-confinement effects. Remarkably, the composite exhibits a record-breaking energy storage density of 13.69 J/cm 3 at an electric field of 470 kV/mm with an ultrahigh efficiency of 85.03 %, surpassing most reported PVDF-based composites under comparable electric fields. Furthermore, the composite uniquely demonstrates temperature-stable ultraviolet fluorescence, a feature that not only confirms structural robustness but also enables real-time self-diagnosis of thermal degradation in optoelectronic devices. By integrating in situ -engineered interfaces, superior dielectric properties, and intrinsic optical sensing capabilities, this work establishes a transformative paradigm for intelligent energy materials in flexible electronics and self-monitoring power systems.
研究领域:
材料科学
·
能源技术
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yawei Shi,Yumei Xing,Keyan Liu,Yan Wang,Ya Sun,Zonglin Pan,Guanghui Ding
Dyes and oil substances are two common pollutants in wastewater, and it is highly expected to remove them simultaneously. In this study, MgFe 2 O 4 was synthesized by co-precipitation and then loaded onto polyvinylidene fluoride (PVDF) membrane to fabricate a MgFe 2 O 4 -PVDF composite membrane, which was successfully employed for concurrent dye degradation through peroxymonosulfate activation and separation of oil-in-water emulsions through one-step single-pass filtration. Under optimum conditions, both Rhodamine B (RhB) and hexane could be efficiently removed by 99.21 % and 99.89 % respectively. The effects of pH, inorganic ions and humic acid were studied, and the system showed wide applicability and good reusability. The reaction mechanism for RhB degradation was proposed based on quenching tests, open circuit potential test, galvanic oxidation process and X-ray photoelectron spectroscopy. The degradation pathway of RhB was proposed according to density function theory calculations for both RhB and its deprotonated counterpart deH-RhB as well as LC-MS analysis, and toxicity evaluation was also performed. The MgFe 2 O 4 -PVDF/PMS system may offer a possible solution for the efficient remediation of complex wastewaters.
研究领域:
环境工程
·
材料科学
·
化学工程
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 22
·50519
·
IF 3.125
Wei Wang,Peng Zhang,Yaping Shi,Zhichao Zhang,Xin Xu,Ping Ding
The composite membrane with the advantages of high separation efficiency and wide application, has been widely concerned in the field of water purification and molecular separation. However, the common composite membrane cannot achieve continuity, or the grafting process is complex, which significantly hinders its further development. In this work, the in-situ polymerization of UiO-66/PVDF supramolecular flat membranes as the continuous and high-performance composite membrane can be easily synthesized using the supramolecular force, (such as, hydrogen bond, etc.). These supramolecular membranes exhibit good hydrophilic (61°) and anti-fouling performance for bovine serum albumin (BSA) solution with rejection rate 97.79% than the original membrane. Moreover, this membrane can achieve more MOF doping based on maintaining the membrane performance, which undoubtedly greatly improves its hydrophilicity and mechanical properties. In addition, we also characterized the porous microstructure of the UiO-66/PVDF supramolecular membrane to analyze the influence of different doping amounts on the membrane structure. This supramolecular membrane has the advantages of simple synthesis, good hydrophilicity and water separation performance, which provides a more convenient and effective way for the preparation of MOFs/polymer flat membrane, and also provides a new method and new idea for expanding the application of MOFs/polymer ultrafiltration membrane in water treatment.
研究领域:
材料科学
·
环境工程
·
分离技术
✓ 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）