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Yingxin Liu,Zuojun Wei,Tiefeng Xing,Meng Lu,Xiaonian Li 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Gold catalysts supported on FeOx–TiO2 with various Fe2O3 contents were prepared by deposition– precipitation method and used for phthalic anhydride hydrogenation to phthalide. The effect of Fe2O3 on the physico-chemical property and the performance of Au/TiO2 were investigated. The reaction conditions were optimized. Adding 5 wt.% Fe2O3 on Au/TiO2 could enhance the activity and stability, which was contributed to the increase in the strength of the catalyst structure and the decrease in the loss of gold from catalyst. Using Au/5%FeOx–TiO2, phthalic anhydride conversion and phthalide selectivity reached 95.4% and 94.5%, respectively, at 190 8C and 3.0 MPa H2 for 7 h.
Effect of lead sulfate on chloride ion transport properties in cementitious material
Xianfeng Wang,Yabin Yuan,Yingxin Huang,Tielin Han,Weilun Wang,Jian Liu,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1
A novel microcapsule-based self-healing system was developed in Guangdong Key Laboratory of Durability in Coastal CivilEngineering to prolong the concrete service life, in which lead sulfate is used as the shell material of the microcapsules. Theself-healing system is triggered by the reaction of lead sulfate with chloride ion. In this study, the effect of lead sulfate onchloride ion transport in cement-based materials was investigated. The bulk diffusion and rapid chloride migration tests werecarried out. The time dependence of chloride diffusion was analysed based on the results of the Bulk diffusion test. The changein the microstructure of cement-based materials upon incorporation of lead sulfate was observed and analysed via mercuryintrusion porosimetry and scanning electron microscopy. Results showed that chloride-binding was prevalent at an immersionperiod of less than 90 days, while sulfate attack superseded after 90 days. Therefore, the impact of both factors needs to beconsidered when utilizing lead sulfate as a shell material in cementitious materials.
A Preliminary Discussion of Talent Cultivation of Korean MTI in China’s Higher Learning Institutions
( Juhua Jin ),( Jiao Liu ),( Yingxin Zhao ) 국어교육학회 2018 國語敎育學硏究 Vol.53 No.5
Literature review and observation are applied in this paper. It is related to the discussion on challenges faced by Chinese talents training in Korean MTI and the status quo of Korean MTI education, as well as the main problems and improvement programs of MTI education, aiming to provide experiences for the building and development of Korean MTI. There are 7 questions in the talents training of Korean MTI. 1) The concept of talent training is unclear. 2) The talent training program is inappropriate. 3) The teacher team is not strong. 4) The teaching method is not upgraded. 5) The practice teaching base is not used. 6) The teaching management method remains unchanged. 7) The vocational qualification certificate does not keep pace with the times. In respond of the questions, the paper proposes four improvement plans, including making clear of teaching objectives, enriching and improving educational methods, improving translation teaching materials system, and actively innovating and carrying out related experiments. The “translation teaching” of MTI is an extension of the “teaching translation” at the undergraduate level. We need to follow up the teaching philosophy, pay attention to students and optimize our talent training system, according to the requirements and challenges faced by the times.
Graphene Enhanced Electrical Properties of Polyethylene Blends for High-Voltage Insulation
Zuojun Wei,Yaxin Hou,Chen Jiang,Haiyan Liu,Xiangrong Chen,Anyun Zhang,Yingxin Liu 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5
Graphene as a novel additive in low density polyethylene (LDPE), high density polyethylene–low density polyethylene blend(10%HDPE–LDPE) and polypropylene–low density polyethylene blend (10%PP–LDPE), is investigated for promising ecofriendlyinsulating materials in high voltage cables. The composites with graphene amounts of 0, 0.002 wt%, 0.02 wt%,and 0.2 wt% are prepared by the solution mixing method. With attempt to disclose the structure–property relationships, thecomposites are extensively characterized by physical techniques including Fourier transform infrared spectroscopy, X-raydiffraction, atomic force microscopy, transmission electron microscopy, scanning electron microscopy, thermogravimetricanalysis and differential scanning calorimetry, and electrical measurements including electrical treeing, direct current conductivityand space charge distributions. Results show that graphene can significantly enhances the thermal stability of LDPEand 10%PP–LDPE, slightly decrease the degree of crystallinity, change the size of the crystal diameters, and improve thephase distribution of the polymer blends. Consequently, graphene can prolong the electrical tree initiation time and blockthe extension of electrical tree. Besides, it can modulate the trap distributions, which will further change the conductivityand ability to suppress space charge accumulations. This excellent performance of graphene could be attributed to its goodexfoliation, uniform dispersion and outstretched morphology in the polymer matrix, as well as its strong ability to captureelectrons.
Zuojun Wei,Yuran Cheng,Mengting Chen,Yuhua Ye,Yingxin Liu 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Using nitrogen-doped mesoporous carbon (NMC) as the support, several NiRe bimetallic catalysts withlow metal loading of 1 wt% were designed and prepared for the selective deoxygenation of oleic acid to n-heptadecanein the absence of hydrogen. Results showed that the Ni80Re20/NMC catalyst with a Ni/Re molar ratio of 80 : 20 achievedthe highest yield of n-heptadecane (92.3%) at 330 oC for 2 h in isopropanol solvent, and at a metal/oleic acid weightratio of 1 : 333. The catalyst can be reused at least five times with slight activity loss. Combined with the results of insituXRD, HRTEM, XPS and CO2-TPD, the formation of NiRe alloy, the very fine NiRe nanoparticle size at 2.30 nm, aswell as the hydrophobic, mesoporous and weakly basic properties of the NMC support surface were demonstrated tocontribute to the excellent catalytic performance of the catalyst.
Hongwei Lu,Jianxin Du,Cuiping Yu,Xingping Wang,Yanlin Gao,Weizhong Xu,Aiping Liu,Xiaoxiao Lu,Yingxin Chen 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
The development of high dielectric materials with high energy densities is a crucial research domain in the modern microelectronics and power systems. The objective of this work was to develop the highly ordered crystal orientations and large ferroelectric crystalline β/γ-phases in the biaxially oriented poly(vinylidene fluoride) (BOPVDF). Importantly, a high discharged energy density and high dielectric constant was achieved by using a high-electric-induced technique. A suitable poling electric field was applied to the BOPVDF films in order to enhance the breakdown strength. Remarkably, the BOPVDF film poled at the electric field of 113 MV m-1 achieved an unprecedented discharged energy density of 25.4 J cm-3 at an ultra-high electric field of 550 MV m-1, which is by far the highest value ever achieved in flexible polymer-based capacitor films. Comparatively, the unpoled BOPVDF and commercial biaxially oriented polypropylene (BOPP) exhibited only a discharged energy density of 7.9 J cm-3 and 1.2 J cm-3, respectively. This systematic study provides a new design paradigm to exploit PVDF-based dielectric polymers for capacitor applications.