COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Hai-Ming Song,Li-Jing Zhu,Mei-Xia Shi,Ai-Yuan Li,Yang-Yang Sun
In order to fully utilize the advantages of expandable graphite (large specific surface area and porous structure), a solvent-free method was used to provide a supporting skeleton for expandable graphite through melting, bonding and solidification of polyvinylidene fluoride (PVDF). Based on its porous structure and enhanced mechanical stability, the formed PVDF/expandable graphite composite foam, amounts of functional groups were introduced throughout the foam (outside on the surface and inner side in the expandable graphite) by deposition of tannic acid (TA) and dopamine (DA), endowing it selective adsorption characteristics. The functioned foam exhibited excellent dynamic dye adsorption capacity by capturing dye molecules firmly through π-π interaction, hydrogen bonding, and charge attraction between the functional groups and dyes. Furthermore, with low zeta potential (-24.9 mV), the functional groups showed selective adsorption properties resulting in rapid separation of cationic dyes and anionic dyes. The functionalized PVDF/expandable graphite composite foam contact these two materials together in order to complement each other's advantages, showing a new research orientation for the treatment of different types of dyestuff wastewater.
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 ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Hongji Li,Junfu Wang,Haoqi Fang,Hongda Xu,Haochen Yu,Tianyu Zhou,Chunbo Liu,Guangbo Che,Dandan Wang
The polyvinylidene difluoride (PVDF) membrane has received considerable attention as a flexible surface enhanced Raman scattering (SERS) substrate due to its excellent mechanical and physicochemical properties . However, the poor fouling resistance of PVDF membrane due to its intrinsic hydrophobic property limits its practical application. To address this, in this investigation, a SERS imprinted membrane is synthesized based on W 18 O 49 /Ag composites. Firstly, to promote hydrophilicity , N-vinyl-2-pyrrolidone (NVP) and triethoxyvinylsilane (VTES) are copolymerized by hydrolysis condensation and linked with engineered polyvinypyrrolidone (PVP) chains exposed on the surface of membrane. Furthermore, W 18 O 49 /Ag composites are dispersed on the membrane under the assistance of polydopamine (pDA) to promote the pollution resistance. Subsequently, in order to demonstrate the practical detection property, W 18 O 49 /Ag/PVDF membrane is selected as the SERS substrate to synthesize SERS imprinted membrane by precipitation polymerization for the selective detection of L-tyrosine. The characteristic results reveal that the SERS-imprinted membrane exhibits satisfactory hydrophilicity, and it can effectively degrade the pollutant molecules absorbed on its surface under ultraviolet light illumination. It is proved from the detection results that the LOD of WADP-MIMs for L-tyrosine reached 10 −9 mol L −1 when the concentration of L-tyrosine changed between 10 −3 –10 −9 mol L −1 . The correlation coefficient (R 2 ) is 0.994 and the limit of detection is 10 −9 mol L −1 . Meanwhile, it can be applied for the selective detection of L-tyrosine in mixture samples. Overall, this study presents a novel approach for the hydrophilic modification and pollution resistance enhancement of PVDF-based SERS imprinted membrane, which can be effectively utilized for the selective detection of practical samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Cheng Han,Huan Zhang,Quan Chen,Tao Li,Lingjian Kong,Hui Zhao,Lirong He
Directional sensors endowed by inherent anisotropic structure have drawn great attention in intelligent sensing systems. Unidirectional lyophilization is the mainstream technique to architect anisotropic structure particularly for water dispersible systems as the ice template can be readily removed at the melting point of water (0 °C). However, it is impractical for water insoluble polymers such as piezoelectric polymer systems as it features extremely low lyophilization temperature (for instance, −61 °C). So far, no piezoelectric polymer derived anisotropic devices has been realized. In this work, for the first time, we succeeded the constructing of anisotropic PVDF/Mxene device with directionally oriented micropores through delicate formulation design which enables the maintaining of oriented template even at temperature above 0 °C. As a result, the as-fabricated PVDF/Mxene composite foam exhibits distinct anisotropic behavior, featuring compressive modulus along the direction of penetrating microchannels being approximately 1.7 times of that in the orthogonal direction. The anisotropic foam is applied as directional sensor with piezo-current as the output signal, which displays a 3.93-fold higher sensitivity difference in the direction perpendicular to the microchannel than in its orthogonal direction. Moreover, the foam exhibits the highest sensitivity of 41.3nA/kPa over pressure range of 2.5–20 kPa, which outperforms state-of-the-art polymer piezoelectric sensors. This novel strategy provides a practical avenue for architecting water-insoluble polymer-derived devices with anisotropic structure in a green and energy-saving manner, which could spur innovations from the fields of electromagnetic interference shielding, energy storage, piezoresistive, thermal insulation and so on wherever anisotropic characteristic is desired.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shangheng Jiang,Shiqiang Liang,Chunxiao Hu,Yuanfang Fan,Zhongmin Su,Zhi Geng,Chi Wang
Membrane Distillation (MD) technology stands out for its cost-effectiveness and sustainability in diverse applications, such as high-salinity wastewater treatment and seawater desalination. However, conventional MD membranes frequently encounter challenges associated with inadequate permeate flux and insufficient anti-wetting performance. In the present study, we fabricated a series of ZIF-CoZn@PVDF-HFP composite nanofiber membranes with a core–shell structure via coaxial electrospinning. Here, PVDF-HFP functions as the core, while a blend of bimetallic Zeolitic imidazolate framework ZIF-CoZn nanoparticles and PVDF-HFP constitutes the shell. Through the utilization of the coaxial technology, functional nanoparticles achieve uniform and stably dispersed on the nanofiber surface, leading to the creation of a secondary rough structure in addition to the inherent roughness of single-nozzle electrospinning. This results in a surface with a 3D-hierarchical structure. The significantly amplifies the evaporation area on the surface of the composite nanofiber membrane, thereby bolstering the permeate flux in the MD process. Additionally, the incorporation of bimetallic ZIF-CoZn nanoparticles, recognized for their superior hydrophobicity and low thermal conductivity, improves the anti-wetting and heat-insulating properties of the composite nanofiber membrane, further advancing permeate flux performance. Using a 35 g L −1 NaCl as the feed solution, the optimal 1 % ZIF-CoZn@PVDF-HFP composite nanofiber membrane demonstrated a permeate flux of 21.8 L m −2 h −1 , coupled with a salt rejection rate exceeding 99.9 %. Even during long-term MD testing, it maintained excellent insulation and anti-wetting capabilities. Our research offers a convenient and effective approach for fabricating anti-wetting composite nanofiber membranes.
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yajie Ding,Jindan Wu,Jianqiang Wang,Haibo Lin,Jiping Wang,Ge Liu,Xiaoqiang Pei,Fu Liu,Chuyang Y. Tang
We report a novel and facile welding strategy using Span 80 to simultaneously enhance the mechanical robustness and superhydrophilicity of an electrospun poly(vinylidene fluoride) (PVDF) nanofibrous membrane. By taking advantage of its amphiphilic property, Span 80 micelle is able to attach PVDF nanofibers due to the strong affinity between the hydrophobic segments of Span 80 and PVDF. The as-prepared PVDF nanofibrous membrane exhibited simultaneously improved stress (from 1.7 ± 0.3 MPa to 8.8 ± 0.6 MPa). Meanwhile, supherhydrophilic property was endowed through the self-assembly of Span 80 on the hierarchical surface of PVDF membrane. Water contact angle (WCA) and under-water oil contact angle (UOCA) of the modified membrane was nearly 0 and 154.9 ± 2 o , respectively. This membrane had a water permeability of 18,482.7 ± 287.3 Lm −2 h −1 bar −1 for 1, 2-dichloroethane-in-water emulsion with a separation efficiency of 96.3%. The welded PVDF nanofibrous membrane exhibited extraordinary robustness, resisting to long-term washing of water and oil-in-water emulsion.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Fang Wang,Xianhong Zhang,Yuhong Ma,Dong Chen,Wantai Yang
A novel flexible dielectric composite with halloysite nanotube-poly(3,4-ethylenedioxythiophene) (HNTs-PEDOT) hybrid as conductive filler and poly(vinylidene fluoride) (PVDF) as polymer matrix were prepared via a blending and hot-pressing technique. HNTs-PEDOT hybrid, with PEDOT coated onto both the negatively charged inner and out surfaces of the HNTs tubes, were fabricated by chemical oxidative polymerization of EDOT with unmodified HNTs as templates. The conductivity of HNTs-PEDOT hybrid with 50 wt% HNTs is up to 12.89 S/cm, which is 100 times greater than that of pure PEDOT (about 0.12 S/cm) synthesized under the similar condition. With PEODT as outside organic layer, HNTs-PEDOT could be easily dispersed in PVDF matrix uniformly. In addition, with the introduction of HNTs-PEDOT into PVDF matrix, it makes a phase transformation of PVDF from α to electroactive β phase. HNTs-PEDOT/PVDF shows good dielectric performance. At close to the percolation threshold value ( f HNTs-PEDOT = 0.11), the dielectric constant of HNTs-PEDOT/PVDF is up to 641 at 1000 Hz, which is attractive to prepare flexible materials.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 99
·97338-97345
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IF 3.289
Weili Li,Zhengbao Zhu,Wenjun Shen,Jijun Tang,Gang Yang,Zexiao Xu
In this paper, a novel composite gel polymer electrolyte (CGPE) was prepared by doping ionomer-modified-graphene (IMGO) into poly(vinylidenefluoride) (PVdF) according to a phase separation technique. As to the doped IMGO, the original sp2 equipotential network of the GO component can be damaged with the grafted ionomer, while, due to the sheet-like morphology, the prepared IMGO can act as the ion-conducting channel in the final CGPE system. The effect of IMGO on the morphology, mechanical and electrochemical performance of the prepared CGPE were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), a differential scanning calorimeter (DSC) and thermogravimetry (TGA), a mechanical tensile test, AC-impedance, linear sweep voltammetry (LSV), and so on. When the relative content of IMGO was at 10 wt%, the prepared CGPE showed the highest ionic conductivity (3.35 × 10−3 S cm−1), and the electrochemical window could be stable up to 4.8 V. The assembled polymer lithium-ion batteries based on it delivered the highest charge–discharge capacity (168.4 mA h g−1) and the capacity retention of the cells (LiCoO2/CGPE/Li) could be maintained by up to 90% after 50 cycles.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Boyu Li,Qingmei Su,Lintao Yu,Wuyou Liu,Shijia Dong,Shukai Ding,Miao Zhang,Gaohui Du,Bingshe Xu
Composite polymer electrolyte (CPE) with enhanced ionic conductivity, excellent flexibility and strong strength are urgently required for all-solid-state lithium metal batteries (LMBs). Inspired by the dragonfly wings that are super-lightweight and ultrathin but have excellent stability when subject to bending and twisting during flapping, we have constructed Li 0.35 La 0.55 TiO 3 (LLTO) nanowires-filled polyvinylidene fluoride (PVDF). In our design, the PVDF is used to construct the ultrathin membrane, the 1D LLTO nanowires are acted as the veins to give rise to a high mechanical strength of 10 Mpa. The special design creates cellular surface of PVDF/LLTO-CPE, which guarantees the excellent flexibility as well as a good interface contact between CPE and Li anode. When evaluated as electrolyte for LiFePO 4 |Li battery, the PVDF/LLTO-CPEs can suppress Li dendrites growth, and thus presents an excellent cycling stability of 140 mAh g −1 after 200 cycles. Moreover, the flexible LiFePO 4 |PVDF/LLTO-CPE|Li 4 Ti 5 O 12 pouch cell delivers a satisfactory rate performance and cycle stability under folding and bending states. The excellent performances are attributed to the unique cellular structure and super mechanical strength of biomimetic PVDF/LLTO-CPE. All results show the PVDF/LLTO-CPE is a promising solid-state electrolyte for flexible electronic devices.
研究领域:
材料科学
·
能源存储
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Xinzhen Zhao,Chunju He
On the basis of the excellent fouling resistance of zwitterionic materials, the super antifouling polyvinylidene fluoride (PVDF) membrane was efficiently prepared though one-step sulfonation of PVDF and polyaniline blend membrane in situ. The self-doped sulfonated polyaniline (SPANI) was generated as a novel zwitterionic polymer to improve the antifouling property of PVDF ultrafiltration membrane used in sewage treatment. Surface attenuated total reflection Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, surface zeta potential, and water contact angle demonstrated the successful fabrication of zwitterionic interface by convenient sulfonation modification. The static adsorption fouling test showed the quantified adsorption mass of bovine serum albumin (BSA) pollutant on the PVDF/SPANI membrane surface decreases to 3(±2) μg/cm2, and the water flux recovery ratio (FRR) values were no less than 95% for the three model pollutants of BSA, sodium alginate (SA), and humic acid (HA), which were corresponding hydrophobic, hydrophilic, and natural pollutants in sewage, respectively. This Research Article demonstrated the antifouling advantages of zwitterionic SPANI and aimed to provide a simple method for the large scale preparation of zwitterionic antifouling ultrafiltration membranes.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Yuanhui Li,Xinyue Yang,Chongxiao Yuan,Xiao Li,Xiang Liu,Huiling Guo,Huajun Sun
While flexible self-powered electronic devices have shown promising prospects for development, substantial challenges remain in enhancing their power output and structural integrity. This study investigates the fabrication of organic piezoelectric nanofibers with a coaxial structure, achieved by electrospinning polyvinylidene fluoride (PVDF) and polyacrylonitrile (PAN), incorporating carbon nanotubes (CNTs). Due to the viscosity differences between PVDF and PAN, the electrospinning process results in a coaxial morphology. The interactions between the dipoles and hydrogen bonds of PAN and PVDF promote the formation of a piezoelectric active phase. The introduction of CNTs as nucleating agents enhances the β-phase content of PVDF and promotes the planar zigzag conformation of PAN. After hot pressing, the resulting terpolymer composite fiber films, are used to construct piezoelectric energy harvesting devices (PEHs). The P/P/C-0.2 PEH, containing 0.20 wt% CNT and 20 wt% PAN, achieves a high open-circuit voltage (V OC ) of approximately 13.7 V and a maximum power density of 0.75 μW/cm 2 in bend-release mode. This device exhibits a stable voltage output over 10,000 cycles, maintaining an output voltage of 7.5 V at 75 °C. Additionally, the PEH effectively captures mechanical energy from human movement. This research presents a promising approach to enhancing the piezoelectric output of flexible piezoelectric devices.
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
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Na Li,Huai-duo Chen,Yong-ze Lu,Ming-chao Zhu,Zhao-xia Hu,Shou-wen Chen,Raymond Jianxiong Zeng
In recent years, nanoscale zero-valent iron (nZVI) has been considered an appealing alternative for halogenated organic compound removal for its advantages, such as its high activity. However, easy aggregation limits nZVI activity. In this study, functional nZVI-modified PVDF membranes (nZVI@PVDF membranes) were successfully prepared by a simple and easy-to-follow filter-press coating method and was applied in the ultrafiltration process to treat 2-chlorophenol (2-cp) wastewater. Scanning electron microscopy showed that nZVI particles were relatively uniformly distributed on the membrane surface and formed a fluffy and porous space-stacked structure. 2-cp ultrafiltration degradation results illustrated that nZVI@PVDF membranes revealed good 2-cp removal efficiencies ranged from 56.06% to74.62%. These 2-cp removal efficiencies were higher than those for Fe supported on powder materials and were relatively comparable to those for nZVI composite membranes prepared by complex methods (e.g., blend spinning and cross-linking methods). Furthermore, the 2-cp degradation efficiencies by nZVI@PVDF membranes were not affected much in the presence of natural organic matter and different ions, demonstrating a robust anti-interference ability of nZVI@PVDF membrane. The mechanism underlying its robust performance likely resulted from that nZVI was uniformly distributed and loaded layer by layer on the PVDF membrane surface with high loading capacity, which guaranteed high nZVI activity, layer-layer interception of pollutants and complete reaction between nZVI and pollutants. These findings provide key insights into how nZVI@PVDF membranes could be integrated into the treatment of wastewater containing refractory pollutants.
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
RSC Advances
·
2023
·Vol. 13
·期 15
·10204-10214
·
IF 3.9
Meilin Li,Bei Jiang,Shuoang Cao,Xinyi Song,Yuanqiao Zhang,Lijun Huang,Quanping Yuan
High-performance flexible barium titanate (BaTiO3)-based piezoelectric devices have gained much attention. However, it is still a challenge to prepare flexible polymer/BaTiO3-based composite materials with uniform distribution and high performance due to the high viscosity of polymers. In this study, novel hybrid BaTiO3 particles were synthesized with assistance of TEMPO-oxidized cellulose nanofibrils (CNFs) via a low-temperature hydrothermal method and explored for their application in piezoelectric composites. Specifically, Ba2+ was adsorbed on uniformly dispersed CNFs with a large amount of negative charge on their surface, which nucleated, resulting in the synthesis of evenly dispersed CNF-BaTiO3. The obtained CNF-BaTiO3 possessed a uniform particle size, few impurities, high crystallinity and dispersity, high compatibility with the polymer substrate and surface activity due to the existence of CNFs. Subsequently, both polyvinylidene fluoride (PVDF) and TEMPO-oxidized CNFs were employed as piezoelectric substrates for the fabrication of a CNF/PVDF/CNF-BaTiO3 composite membrane with a compact structure, displaying the tensile strength of 18.61 ± 3.75 MPa and elongation at break of 3.06 ± 1.33%. Finally, a thin piezoelectric generator (PEG) was assembled, which output a considerable open-circuit voltage (4.4 V) and short-circuit current (200 nA), and could also power a light-emitting diode and charge a 1 μF capacitor to 3.66 V in 500 s. Its longitudinal piezoelectric constant (d33) was 5.25 ± 1.04 pC N−1 even with a small thickness. It also exhibited high sensitivity to human movement, outputting a voltage of about 9 V and current of 739 nA for only a footstep. Thus, it exhibited good sensing property and energy harvesting property, presenting practical application prospects. This work provides a new idea for the preparation of hybrid BaTiO3 and cellulose-based piezoelectric composite materials.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）