Materials
·
2020
·Vol. 13
·期 4
·933
·
IF 3.057
Yuexuan Li,Yugang Duan,Chengmeng Wang
Graphene has been regarded as one of the most promising two-dimensional nanomaterials. Even so, graphene was still faced with several key issues such as impedance mismatching and narrow bandwidth, which have hindered the practical applications of graphene-based nanocomposites in the field of microwave absorption materials. Herein, a series of Si-modified rGO@Fe3O4composites were investigated and fabricated by a simple method. On one hand, the degree of defects in graphene carbon could be tuned by different silane coupling reagents, which were beneficial to enhancing the dielectric loss. On the other hand, the spherical Fe3O4nanoparticles provided the magnetic loss resonance, which contributed to controlling the impedance matching. Subsequently, the electromagnetic absorption (EMA) properties of Si-modified rGO@Fe3O4composites with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) were investigated in this work. As a result, the Si(2)-rGO@Fe3O4/PVDF-co-HFP composite exhibited the excellent EMA performance in the range of 2–18 GHz. The maximum reflection loss (RLmax) reached −32.1 dB at 3.68 GHz at the thickness of 7 mm and the effective absorption frequency bandwidth for reflection loss (RL) below −10 dB was 4.8 GHz at the thickness of 2 mm. Furthermore, the enhanced absorption mechanism revealed that the high-efficiency absorption performance of Si(2)-rGO@Fe3O4/PVDF-co-HFP composite was attributed to the interference absorption (quarter-wave matching model) and the synergistic effects between Si(2)-rGO@Fe3O4and PVDF-co-HFP. This work provides a potential strategy for the fabrication of the high-performance EMA materials.Keywords:absorbing materials;Si-modified rGO@Fe3O4/PVDF-co-HFP composites;dielectric loss;magnetic loss;electromagnetic properties
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Junda Wu,Zhiqiang Hou,Zhixin Yu,Jihui Lang,Jiuyun Cui,Jin Yang,Jiangdong Dai,Chunxiang Li,Yongsheng Yan,Atian Xie
Owing to the complex application environments, designing and fabricating emulsion separation membrane via facile preparation method with high separation efficiency and superior chemical stability are necessary. Herein, the TA-Ti@PVDF composite membranes via facile layer-by-layer self-assembly process with the merits of low-cost and eco-friendly have been reported. The property of TA-Ti@PVDF composite membrane can be regulated via changing the times of coating process, shows great experimental flexibility and practicability. Additionally, the separation efficiency of prepared membrane is as high as 99.35%, and the permeation flux is 689.6 L m -2 h −1 bar −1 . Most importantly, the prepared TA-Ti@PVDF composite membrane exhibits superior chemical stability (acid/alkali/salt resistance) and outstanding underwater oil repellence property. The separation efficiency of the composite membrane which treated by acid/alkali solutions are all above 97.39%. Generally, the low-cost and eco-friendly TA-Ti@PVDF composite membrane via facile coating process is appropriate for oily water treatment in the practical complicated environment, and possesses great potential in oil/water emulsion 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
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Qingguo Chi,Tao Ma,Yue Zhang,Qingguo Chen,Changhai Zhang,Yang Cui,Tiandong Zhang,Jiaqi Lin,Xuan Wang,Qingquan Lei
The high-performance energy-storage dielectric capacitors are increasingly necessary for the development of miniaturization, integration, and multifunctionality of electronic devices. Here, we describe a new strategy of a sandwich-structured polymer-based dielectric composite with inorganic fillers of semiconductor@perovskite hybrid fibers, and this novel dielectric composite possesses an excellent energy-storage performance at low electric field. It is of crucial importance to achieve hybrid nanofibers of 0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 nanofibers (BZT–BCT NFs) deposited by CoFe2O4 nanoparticles (CFO; hereafter, CFO@BZT–BCT NFs in short). Herein, the BZT–BCT NF ceramic has the typical perovskite structure and large dielectric constant, which is used as the ceramic-support for CFO. Meanwhile, the semiconductor of CFO works as the electron donor to offer a great interfacial polarization for the improvement of overall dielectric constant of the composite. Remarkably, the trilayer structure is composed of outer poly(vinylidene fluoride) (PVDF) layer to improve the breakdown strength and middle CFO@BZT–BCT NFs–PVDF nanocomposite to enhance the dielectric properties. The BZT–BCT NFs were prepared by electrospinning, and then the CFO@BZT–BCT NFs were gained by hydrothermal method. Furthermore, the BZT–BCT NFs and the CFO@BZT–BCT NFs were modified by polydopamine (PDA). Finally, the sandwich-structured composites were gotten by a typical process of solution-casting and hot-pressing. The influences of fillers’ volume fraction and type on the performances of composites have been systematically investigated. The PVDF/CFO@BZT–BCT NFs–PVDF/PVDF composite (P/CFO@BZT–BCT NFs–P/P) exhibits an outstanding energy density performance under a low electric field. The trilayer structure composite with an optimized content of nanofibers possesses an excellent dielectric performance (dielectric constant ∼20.1 at 100 Hz) and great energy-storage performance (electric displacement ∼10.7 μC/cm2, discharged energy density ∼11.3 J/cm3, and efficiency ∼55.5% at a low electric field of 350 kV/mm). This work paves the way for potential applications in integrated electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Ahai Zhu,Jian Zheng,Zhijia Zhu,Chunyan Hu,Baojiang Liu
Oil scaling poses a significant threat to the stability of membrane separation flux during the process of oil-water emulsion separation. A single hydrophilic modified layer demonstrates the capability to effectively separate emulsions. However, it does not prevent severe water flux degradation. Although the “dual-defense” design has been proposed, the construction of a double hydrophilic anti-fouling process on the surface of the membrane is prone to clogging of the membrane, and the surface is difficult to regulate. Here, we designed a two-layer antifouling strategy using vacuum deposition method, in which the first barrier is formed by dopamine (DA) and polyethyleneimine (PEI)-coated carbon nanotubes (CNTs), and the second barrier is formed by a polyelectrolyte complex of phytic acid (PA) and polyethyleneimine (PEI) encapsulating the first barrier, which is deposited on the surface of AT-PVDF membranes. The spatial hierarchical structure provides a highly covered “double defense” barrier on the membrane surface, effectively preventing the adhesion of grease and dirt. In the separation of surfactant-stabilised oil-in-water emulsions, the emulsion separation efficiency reaches 99.8 %, and the water flux recovery rate is more than 90 % after cyclic separation. And the potential mechanism of underwater antifouling self-cleaning was analysed by density flood theory (DFT) calculations. In particular, the multilayer composite membrane was able to effectively adsorb cationic dyes in wastewater through the electrostatic effect of the first and second barriers, with a separation efficiency of more than 95 %. Therefore, the prepared superhydrophilic multilayer composite membrane has potential application prospects in the field of wastewater purification.
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 MATERIALS RESEARCH
·
2021
·Vol. 36
·期 7
·1538-1548
·
IF 3.089
Gao Jingru,Jia Shuyue,Liu Jia,Sun Zhaojie,Yang Xu,Tang Dongyan
Abstract By electrospinning and the following electrospraying, porous polyvinylidene fluoride nanofiber scaffolds with the embedded titanium dioxide (TiO 2 ) nanoparticles were fabricated to improve the adsorption and photocatalytic performance. Adsorption experiments to MB showed the best adsorption capacity of the scaffolds with the value of 46.87 mg/g. The photocatalytic degradation performance of the composite nanofibers was directly proportional to the embedded amounts of the nanoparticles. Moreover, the introduction of the porous and the embedding of the photocatalytic nanoparticles contributed the synergetic effects by improving the adsorption capacity to 85.70 mg/g within relative short period of time, and so the photocatalytic efficiency of TiO 2 was enhanced and the energy requirement of photocatalysis was reduced to some extent. Through fourth cycles of the adsorption and the photocatalytic experiments, the nanofibers showed relative excellent recycling performances (> 89.5%). Thus, the composite nanofibers would be the potential effective and stable ones to remove pollutants from wastewater or other circumstances. Graphic abstract
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
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 5
·1701147
·
IF 4.834
Shamshad Ali,Chao Tan,Muhammad Waqas,Weiqiang Lv,Zhaohuan Wei,Songhao Wu,Bismark Boateng,Jingna Liu,Junaid Ahmed,Jie Xiong,John B. Goodenough,Weidong He
Toward high-temperature lithium-ion batteries, adding inorganic materials are proposed as an effective strategy. However, inorganic particles tend to aggregate in the polymer matrix, causing degradation in battery performance. Here, a PVDF-HFP/colloidal Al 2 O 3 composite separator is prepared with a phase inverse method. The colloidal Al 2 O 3 particles well dispersed in the PVDF-HFP polymer matrix substantially enhance the mechanical strength of the PVDF-HFP separator. The PVDF-HFP/colloidal Al 2 O 3 composite separator owns a high electrolyte uptake of 372%, a high ionic conductivity of 1.3 × 10 −3 S cm −1 at 80 °C and delivers high capacity retention of 95.6% after 100 charge–discharge cycles at 0.5 C. In addition, PVDF-HFP/colloidal Al 2 O 3 separator only has a 4.5% thermal shrinkage at 150 °C and exhibits high electrochemical performances upon annealing at 140 °C.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Bingjie Huo,Jingxue Wang,Zichen Wang,Xiaowen Zhang,Jingwei Yang,Yinglong Wang,Jianguang Qi,Wei Ma,Fanqing Meng
E-MoS 2 /PVDF piezoelectric microcapsules with superior piezocatalytic performance were synthesized by coupling of expanded MoS 2 (E-MoS 2 ) and polyvinylidene fluoride (PVDF). The bubble-driven piezocatalysis process was proposed for the first time, using as-prepared E-MoS 2 /PVDF microcapsules as piezocatalyst for the degradation of antibiotics. Results showed that the degradation efficiency of tetracycline (TC), chlortetracycline (CH), and ofloxacin (OFL) in the E-MoS 2 /PVDF microcapsules solution was 91.88%, 85.48% and 96.84% in 60 min, respectively. After 5 times of recycling, the degradation rate of TC still reaches more than 73%. Importantly, the energy consumption of this bubble-driven piezocatalysis process (76.00 kwh −3 order −1 ) was only 6.43% of ultrasonic processes. In addition, the study of the degradation mechanism found that the bubble-driven stimulated the generation of more 1 O 2 , O 2 − while increasing the content of dissolved oxygen in the water, which promoted the piezocatalytic degradation. The possible degradation paths were obtained, and the toxicity migration during the degradation of tetracycline was evaluated. The bubble-driven method provides a direction for reducing energy consumption and supplementing the oxygen consumption of degradation in wastewater pollutant treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yacong Yang,Zhihao Cao,Tianhan Shen,Junyang Zhang,Zuofei Gu,Mingwan Zhao,Zongli Xie,Yingchun Miao,Yuning Huo,Hexing Li
The photocatalytic membrane systems show great potential for water purification and wastewater treatment with efficient energy utilization. Herein, we develop a synergistic photocatalytic-photothermal route, based on Pd-TiO 2 /PEDOT composite immobilized in PVDF membrane, for effective water permeability and reutilization property. Novel Pd-TiO 2 /PEDOT/PVDF ultrafiltration membrane is prepared by the phase inversion method with immobilizing Pd-TiO 2 /PEDOT obtained by ultrasonic irradiation. During the removal of HA under light irradiation, Pd-TiO 2 /PEDOT/PVDF membrane presents an unexpected increasing in water flux, when compared to pristine PVDF, Pd-TiO 2 /PVDF and PEDOT/PVDF membranes, with the highest normalized flux reaches up to 2.1 and remains as 1.3 even after 300 min of irradiation. This significantly enhances the water transport, along with the achieved high rejection and anti-fouling performance. It can be attributed to synergistic photocatalytic-photothermal effect of Pd-TiO 2 /PEDOT, which is realized by their strong interaction and uniform distribution. The addition of PEDOT promotes photocatalytic effect of Pd-TiO 2 by enhancing separation of photo-induced charges. High photothermal conversion efficiency of Pd-TiO 2 /PEDOT and low temperature difference in Pd-TiO 2 /PEDOT/PVDF membrane facilitate effective thermal storage, beneficial for water transport. Meanwhile, thermal energy promotes generation of more ∙OH and ∙O 2 – radicals to remove pollutants. Synergistic photocatalytic-photothermal contribution in Pd-TiO 2 /PEDOT/PVDF membrane shows significant potential for practical 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
POLYMER ENGINEERING AND SCIENCE
·
2018
·Vol. 59
·期 1
·103-111
·
IF 1.551
Ying Gong,Wenying Zhou,Xuezhen Sui,Yujia Kou,Li Xu,Yue Duan,Fuxin Chen,Ying Li,Xiangrong Liu,Huiwu Cai,Qingguo Chen,Zhi-Min Dang
Surface modification of core-shell structured Al (Al@Al 2 O 3 ) nanoparticles was performed using γ -(Aminopropyl)-triethoxysilane (APS) and dopamine (DA), respectively, and the microstructures, dielectric properties and thermal conductivities of the Al/poly(vinylidene fluoride) (PVDF) nanocomposites were investigated. Both DA and APS enhance the interfacial bonding strength between the fillers and the matrix, leading to homogeneous dispersion of Al nanoparticles in PVDF matrix. Compared with raw Al nanoparticles, surface-treated Al/PVDF exhibit much higher dielectric permittivity due to the enhanced interfacial interactions between the two components, whereas, the dielectric loss and electric conductivity of the nanocomposites still remain at rather low levels owing to the insulating alumina shell preventing effectively core Al from direct contact. The dynamic dielectric properties results reveal that dielectric constant and loss increase with temperature due to the gradually enhanced mobility of molecular chain segments of PVDF for the raw Al/PVDF and treated Al/PVDF nanocomposites. Additionally, the PVDF nanocomposites with Al treated with APS and DA show enhanced thermal conductivities compared with raw Al/PVDF under the same filler loading because of reduced thermal interfacial resistance promoting phonon transfer across the interfaces. POLYM. ENG. SCI., 59:103–111, 2019. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Qin Wang,Huizi Li,Xiaojie Liu,Tingyao Du,Jianyu Guo,Siyong Zhang,Yan Lu
In this work, a carbon-based monolith with macroporous-mesoporous structure derived from polyvinylidene fluoride (PVDF) hollow fiber membranes is reported. The Co 2+ soaked PVDF hollow fiber membranes are treated with vinyltrimethoxysilane (VTMS) and calcined at relatively low temperatures (600 °C) to obtain a carbon-based material with a distinctive honeycomb porous structure . The VTMS treatment is the committed step, which provides a hard SiO 2 protective layer for the PVDF hollow fiber membrane during the calcination process to support the skeleton structure and prevent the macrostructure collapse and also plays a role in expanding mesopores. The obtained hierarchically porous structure can improve the electrochemical activity of the carbon-based material. In a three-electrode system, the specific capacitance of 701.0 F g −1 can be achieved at a current density of 1 A g −1 , and the retention rate is 112.1 % after 10,000 cycles at 10 A g −1 . The assembled quasi-solid-state symmetric supercapacitor can be operated in a 0–1.4 V voltage window, and it demonstrates an energy density of 26.3 Wh kg −1 at the power density of 349.9 W kg −1 .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Tiandi Pan,Jian Liu,Nanping Deng,Zongjie Li,Liang Wang,Zhaopeng Xia,Jie Fan,Yong Liu
The anti-wetting and anti-scaling abilities of membrane are two critical properties for the membrane distillation. In this work, a superhydrophobic hybrid composite nanofiber membrane with the construction of hydrophobic ZnO nanowires on PVDF nanofiber membrane (P–ZnO@PVDF) based on hydrothermal method and chemical vapor deposition (CVD) was presented. Imitating the growth of grass was employed to enhance the adhesion between ZnO nanowires and PVDF nanofiber membrane. The P–ZnO@PVDF membrane exhibited high porosity, narrow pore size distribution , superhydrophobicity, anti-wetting and anti-scaling, owing to the slip and Cassie-Baxter state caused by introduction of hydrophobic ZnO nanowires. Moreover, the membrane with robust durability presented the salt rejection of 99.9% and a stable permeation flux of 15.7 L m −2 h −1 for simulated seawater at the feed temperature of 60 °C and the distillate temperature of 20 °C after 60 h operation. The hybrid composite nanofiber membrane is to be a potential candidate for long-term operation of membrane distillation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zeren Kang,Wei Wang,Jinhai Xu,Xiaoji Zhou,Shusu Shen,Renbi Bai
The poor thermal stability of polyvinylidene fluoride (PVDF) membranes and their tendency to swell in organic solvents limit their widespread application in the field of membrane technology. In this study, the fluorinated polyimide (FPI), P(6FDA-BAPOFP), was investigated for the first time as a modifier for the PVDF membrane to enhance its stability at high temperatures and in organic solvents. By leveraging the inherent affinity between the C-F bond in FPI and PVDF, the compatibility of the physical blending has been significantly improved. The optimal addition of 2.5 % FPI led to a 2.0-fold increase in flux while preserving rejection. The introduction of FPI into the membrane effectively delayed the thermal weight loss, demonstrating stable performance in 90 °C water. In particular, after an operational period of up to 12 days, the modified membrane exhibited > 80 % Congo Red rejection and relative stable permeance (85 L·m −2 ·h −1 ·bar −1 ). This high-flux polymer membrane contributes to energy conservation and emissions reduction in industrial production.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 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）