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Yunong Li,Dening Zou,Wanwan Chen,Yingbo Zhang,Wei Zhang,Fanghong Xu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
To study and understand the solidification behavior of super austenitic stainless steel under different cooling rates and segregationlaws of alloying elements is of great significance to optimize the subsequent diffusion annealing homogenizationtreatment process and improve product quality. According to Thermo-Calc thermodynamic simulation results and combinedwith high temperature laser confocal scanning electron microscope (HT-CSLM), the tissue morphology of 904L superaustenitic stainless steel was observed in-situ during solidification. The solidification path of the test steel was determinedvia calculation with the Scheil-Gulliver model. Microscopy techniques, including true color microscopy, scanning electronmicroscopy (SEM), energy dispersive spectrometer (EDS), and electron probe microanalyzer (EPMA) were used to analyzethe influence of different cooling rates (6 ℃/min, 50 ℃/min, and 100 ℃/min) on the solidification structure and determine themain distribution law of alloying elements. This analysis determined that the solute distribution coefficient (K) of Cr, Mn,Mo, Cu, and Si elements is less than 1 during the solidification process, which means that they will accumulate in the liquidphase. Among them, elemental Mo segregation is the most severe, while elemental Ni hardly segregates. As the cooling rateincreases, the crystallization temperature of the test steel decreases, and the secondary dendrite arm spacing λ2 decreases,the concentration of Mo in the residual liquid phase increases.
Yue Li,WanWan Li,Minhua Fang,XiaoLin Yao,Chao Chen,Miao Shui,Jie Shu,Yuanlong Ren 한국물리학회 2017 Current Applied Physics Vol.17 No.8
Zn1-xCoxO (0 x 0.15) anode material was prepared by an easy polyacrylamide assisted sol-gel route. The successful replacement of Zinc by Cobalt within Cobalt content x 0.09 was confirmed by structural characterization. The introduction of Cobalt element greatly improved the electro-chemical performances of the matrix Zinc oxide. Without carbon coating, at the 20th cycle, Zn0.91Co0.09O anode still preserved a capacity a little bit more than 1000 mA h g1 and a capacity more than 600 mA h g1 was retained at the end of the 50th cycle. Better rate capability was also witnessed. The SEM, EIS at OCV, CV and in situ XRD were further carried out to elucidate the lithiation mechanism. The role Cobalt doping played can be summarized as follows: the stabilization of the Li2Zn phase, the minimization of charge transfer resistance and the enhanced reversibility of the reduction from metal oxide to metal.
Wanwan Ma,이유리,Guizhen Li,노경호 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.10
Five types of ionic liquid-based silica (SilprBImCl, SilprImNH2, SilprPy, SilmPS, and SiImBr) with different radical groups were synthesized and applied to the separation of three bioactive compounds (rutin, quercetin, and scoparone) from Herba Artemisiae Scopariae by three multi-dimensional solid-phase extraction (MDSPE) methods combined with high-performance liquid chromatography. After comparing the comprehensive adsorption capacity test of the five types of ionic liquid-based silica materials, SilprPy and SilmPS, with the highest adsorption capacity were selected and applied in the packing of three different types of MDSPE process (layered MDSPE, blended MDSPE, and stacked MDSPE). With 2.0 mL of ethanol as the washing solution and 2.0 mL of methanol as the elution solution, blended MDSPE achieved the highest recoveries of all three target compounds (91.2% for rutin, 84.3% for scoparone, and 89.7% for quercetin).
대운량,( Ma Wanwan ),( Li Guizhen ),노경호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Two facile deep eutectic solvents grafted magnetic chitosan (CTS) coated molecular imprinted polymers (Fe<sub>3</sub>O<sub>4</sub>-CTS@DES-MIPs) were synthesized for the selective recognition and separation of (+)-catechin, (-)-epicatechin, and (-)-epigallocatechin gallate from black tea with magnetic solid-phase extraction, and the new-type DESs were adopted as the functional monomer. The two obtained Fe<sub>3</sub>O<sub>4</sub>-CTS@DES-MIPs were characterized with fourier transform infrared spectrometry and field emission scanning electron microscope. The selective recognition ability was investigated by adsorption experiments. The actual extracted amounts of (+)-catechin, (-)-epicatechin, and (-)-epigallocatechin gallate concentrations in black tea using the Fe<sub>3</sub>O<sub>4</sub>-CTS@DES-MIPs with the MSPE method were 13.10 mg·g-1, 6.32 mg·g<sup>-1</sup>, and 8.76 mg·g<sup>-1</sup>, respectively. The Fe<sub>3</sub>O<sub>4</sub>-CTS@DES-MIPs presented outstanding recognition and selectivity, so that it can be utilized to separate bioactive compounds from black tea.
Laidong Yang,Quanan Li,Xiaoya Chen,Wanwan Mei,Nana Zhang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
The influence of Ce microalloying (0.6 wt%) on the microstructure and strengthening mechanism of the extruded Mg–10Gd–0.5Zr alloy were comprehensively researched and analyzed. The experimental results revealed that the addition of 0.6 wt% Ceexcellently reduced the grain size of the as-cast alloy and increased the amount of Mg5Gdeutectic phase. The Ce microalloyingpromoted the dynamic recrystallization level of the extruded alloy, reduced the number and grain size of deformed grains,increased the number of dynamically recrystallized grains, and transformed the basal plane < 10 1 0 > fiber texture graduallyinto < 0001 > texture. Ce microalloying promoted the dynamic precipitation of a small amount of β-Mg5Gd and α-Mg12Ceparticles. After peak aging, the Ce microalloying improved the aging response, increased the aging hardness of the alloy,promoted the aging precipitation of phase, and enhanced the quantity and aspect ratio of phase. The incremental tensileyield and ultimate tensile strength of the extruded alloy resulting from Ce microalloying are 14 MPa and 11 MPa separately,and those of the peak-aged alloy are 53 MPa and 34 MPa respectively. The increase in yield strength of the extruded andpeak-aged alloy is ascribed to the enhanced grain boundary strengthening and the promotion of the phase precipitationstrengthening by Ce microalloying, respectively.