SOLID STATE IONICS
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2013
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IF 2.046
Li Ye,Liangfang Zhai,Jianhua Fang,Jianhong Liu,Cuihua Li,Rong Guan
A series of novel cross-linked and quaternized poly(vinyl alcohol) (QPVA) anion exchange membranes were prepared for application in alkaline anion exchange membrane fuel cells. These membranes, with excellent electrical and thermal properties , were prepared via a relatively simple procedure, by using nontoxic and mild 4-methyl-4-glycidylmorpholin-4-ium chloride (MGMC), made in the laboratory, as a quaternization reagent to graft aliphatic morpholine ring units that acted as the fixed charged groups, followed by reacting the remaining unreacted hydroxyl groups with different amounts of bisphenol-A epoxy resin (DGEBA) and alkalization. The reaction products were characterized by nuclear magnetic resonance ( 1 HNMR), Fourier transform infrared (FTIR), elemental analysis , scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and electrochemical methods . The membranes exhibited good thermal stability below 210 °C. The ionic conductivity can be as high as 5.21 × 10 − 2 S·cm − 1 at 60 °C in water.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Materials Chemistry C
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2022
·Vol. 10
·期 20
·8043-8049
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IF 8.067
Yilin Wang,Bo Jiang,Tao Sun,Sha Wang,Yongcan Jin
MXenes (Ti3C2Tx) as two-dimensional nanomaterials have demonstrated great potential in energy storage, electromagnetic interference shielding and catalysis. However, the mechanical fragility of MXenes and their vulnerability to oxidation in a water–oxygen environment severely limit their practical application. Herein, inspired by the “brick and mortar” structure of natural nacre, a flexible MXene/quaternary chitosan (QCS) membrane with high mechanical robustness, outstanding antioxidant activity, and tailored electronic conductivity was developed for efficient photothermal conversion. The intercalation and confinement of positively charged QCS molecular chains between MXene nanosheets largely enhance the mechanical strength of MXene/QCS membranes by improving the interfacial interaction. Arising from the electrostatic interaction and hydrogen bonding between MXene nanosheets and QCS molecular chains, MXene/QCS membranes simultaneously possess a high tensile strength of 50.93 MPa and a Young's modulus of 4.4 GPa. The electronic conductivity can be easily tailored by controlling the MXene-QCS weight ratio, achieving a maximum value of 128 S m−1. Interestingly, the antioxidant nature of QCS contributes to an outstanding radical scavenging capacity of over 80%. More importantly, the developed MXene/QCS membrane demonstrates efficient photothermal conversion with the rate of the temperature increase up to 1.5 °C min−1 under simulated sunlight irradiation, showing great potential in the fields of photothermal therapy and solar steam generation.
研究领域:
材料科学
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能源科学
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生物医学工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jiefeng Pan,Yanyao Tao,Lei Zhao,Xiaohong Yu,Xueting Zhao,Tao Wu,Lifen Liu
At present, most preparation processes of ion exchange membranes inevitably involve toxic solvents and complicated synthetic procedure. Herein, we reported a one-pot ultraviolet induced polymerization route to prepare quaternized imidazole-based anion exchange membranes. During the preparation processes, only environmentally friendly ethanol and water were used as solvents. The effects of mass ratio of quaternized imidazole monomer, crosslinker and vinylimidazole comonomer diluent on membrane structures and properties were carefully investigated to optimize the performance of anion exchange membrane. In optimized conditions, reliable mechanical properties as well as good electrochemical property could be achieved. The best-performing membrane showed a resistance of 1.86 Ω·cm 2 (reaching the level of a normal homogeneous membrane) and desalination ratio as high as 99% (superior to the commercial anion exchange membrane Fuji type II (98%)). Besides, the reaction mass efficiency of all membranes was above 94%, indicating the high raw material utilization, low energy consumption and environmentally friendliness of the proposed synthetic route. This research would shed light on the development and commercialization of the green synthetic route for ion exchange membranes.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
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2017
·Vol. 303
·期 2
·1700430
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IF 2.863
Zelin Wu,Jiming Wang,Danfeng Pei,Liang Li,Youbing Mu,Xiaobo Wan
Although significant progress has been made in the preparation of mussel-inspired antibacterial coatings, continual challenges still remain in pursuing more facile and simpler fabrication methods to construct more robust and effective coatings. In this study, quaternized catechol (QCat), which is synthesized via a simple quaternization reaction from two commercially available materials, 2-chloro-3′,4′-dihydroxyacetophenone and N , N -dimethyldodecylamine, is used as a reactive antimicrobial agent to fabricate mussel-inspired antibacterial coatings. Specifically, QCat reacts with branched polyethyleneimine (PEI) in Tris-HCl solution through a cross-linking reaction between amino and catechol groups to form a homogeneous coating on various substrates via a simple co-deposition process. The formed PEI/QCat coating exhibits highly effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli and good adhesion on glass, metal, and plastic substrates. Such a simple fabrication process makes it a potential candidate for industrial and medical applications.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 138
·期 15
·50201
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IF 2.52
Ao Ding,Jinyue Zhou,Xiangze Cheng,Chunhui Shen,Shanjun Gao
A series of tertiary amine and siloxane crosslinked composite anion exchange membranes were prepared by incorporating 2-(3,4-epoxycyclohexyl) ethyltrimethoxysilane (EHTMS) and N , N , N ′, N ′-Tetramethyl-1,6-hexanediamine (TMHDA) into N -Methyldiethanolamine (MDEA)-functionalized poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) backbone via sol-gel process. The resultant membranes named as AEM-X (X = 1, 2, 3, 4), which own a three-dimensional (3D) cross-linking structure, exhibit superior swelling resistance, mechanical properties, even the thermal stability is up to 220°C. Compared with AEM-1 (contains no crosslinker), the swelling ratio of AEM-2 obviously decreases by 10.2% at 80°C, while the OH − conductivity of AEM-2 has a merely 1.9% decline (20.6 mS cm −1 ) at 80°C and can maintain 67% of its initial value in a 2 M aqueous NaOH at 80°C for 240 h. The simultaneous introduction of inorganic siloxane and organic linear crosslinker provides a new idea for the preparation of anion exchange membranes with largely improvement in dimensional stability and alkali resistance while the ionic conductivity is kept at comparatively high level.
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
高影响因子
HIGH PERFORMANCE POLYMERS
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2017
·
IF 1.179
Gongyi Liu,Zijun Xia,Shanshan Jin,Xiaoxia Guo,Jianhua Fang
A series of novel cross-linked blend membranes have been successfully prepared from poly(2,2′-(p-oxydiphenylene)-5,5′-bibenzimidazole) (OPBI) and partially quaternized poly(1-vinylimidazole) (QPVI) at varied polymer weight ratios using 1,6-dibromohexane as the cross-linker. The resulting cross-linked blend membranes are ductile and transparent. Cross-linking causes slight increase in tensile strength and significant improvement in immobilization of the QPVI. The effect of the QPVI content on membrane properties such as mechanical properties, thermal stability, ion exchange capacity, water uptake, swelling ratio, and anion conductivity is investigated. The charge–discharge performance of the single cells assembled with the cross-linked blend membranes has also studied and compared with that of the one assembled with Nafion 117. The cross-linked blend membranes exhibit three to four orders lower VO2+ permeability than Nafion 117 leading to much slower self-discharge rate and significantly higher coulombic efficiency of the former. The single cells assembled with the cross-linked blend membranes show higher coulombic efficiency and energy efficiency at low current densities than the one assembled with Nafion 117. Furthermore, the single cell assembled with the cross-linked blend membrane OPBI/QPVI(3:7, weight ratio)-Cross-linked (CL) shows little decay in energy efficiency after 300 charge–discharge cycles test at 80 mA cm−2 indicating good durability of this membrane.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）