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Yanshuang Meng,Zhong Zhang,Wangqing Han,Yue Zhang,Fuliang Zhu,Da-jian Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.1
A one-step microwave-assisted pyrolysis of ionic liquid process is developed to synthesize carbon-coated LiFePO4 by using the ionic liquid [BMIm]N(CN)2 as a carbon source. A thin layer of uniform and nanoscaled carbon film is formed on the LiFePO4 particles surface with a strong interface. The electrochemical properties of LiFePO4 are improved due to the carbon coating which increases the electronic conductivity of LiFePO4. The results indicate that the microwaveassisted pyrolysis of ionic liquid process is a rapid and efficient method to prepare carbon-coated LiFePO4 material and other carbon-coated electrode materials.
Yongdi Ma,Xi Chen,Shuai Wang,Hualin Dong,Xiaoying Zhai,Xin Shi,Jianzu Wang,Rujiang Ma,Wangqing Zhang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
PVDF membrane has strong hydrophobicity and low anti-pollution performance, greatly limiting its practicalapplication. These drawbacks have been successfully overcome by designing and then preparing amembrane with a semi-interpenetrating polymer (semi-IPN) of PVDF/poly(acrylic acid) (PAA) as themembrane matrix, TiO2 nanoparticles as functional components and F127 as pore-forming agent. Thesemi-IPN was prepared by copolymerizing acrylic acid with N,N methyl acrylamide in the presence ofPVDF, and the TiO2 gel nanoparticles were in situ formed in the membrane-forming process. The propertiesof the composite membrane were significantly affected by the semi-IPN, F127 and TiO2. By adjustingthe membrane structure with the semi-IPN, F127 and TiO2 nanoparticles, we prepared a composite membranewith a water contact angle of 40, a BSA rejection ratio of 87.5% and a water flux of 802.5 L/m2/h/bar. After a simple UV irradiation, the water flux of this composite membrane rose to 1030 L/m2/h/bar,without any rejection decline. The membrane contaminated by humic acid could recover the water fluxup to above 95.3% of its original value by a single UV irradiation, showing a very good antifouling performance. In addition, the composite membrane also exhibited a very strong pollution resistance and separationperformance for bovine serum albumin and oil-water emulsion. All in all, based on the synergy ofthe semi-IPN and the evenly dispersed TiO2 nanoparticles, the prepared composite membrane exhibitedexcellent comprehensive properties and demonstrated a great potential for various separationapplications.