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Zhongqiang Liu,Zhen Wang,Chaofeng Gao,Ruiping Liu,Zhiyu Xiao 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
In this paper, surface roughness, microstructure, mechanical properties, and very high cycle fatigue behavior of Ti6Al4Vfabricated by selective electron beam melting were studied. Results show that the mechanical properties in xoz direction(yield strength: 891 ± 14 MPa, ultimate tensile strength: 987 ± 8 MPa, elongation: 15.7 ± 1.9%) are better than that in xoydirection (yield strength: 869 ± 11 MPa, ultimate tensile strength: 955 ± 7 MPa, elongation: 9.8 ± 2.3%) due to the presenceof continuous columnar prior-β grain boundary (α layer) and the strong ⟨0001⟩ texture along the building direction. Thevery high cycle fatigue (105–109 cycles) experiments show that when the fatigue life exceeds 107cycles, the sample willstill undergo fatigue fracture. The S–N curve is a bilinear relation, which is caused by the crack initiation position convertedfrom the surface to the interior.
Jianfei Zhu,Xiaomei Chen,Tingting Huang,Dongling Tian,Ruiping Gao 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.2
In this paper, chitosan/ethyl-vanillin (CS-EV) Schiff-base edible films with CS and EV at different concentrations and ratios were successfully prepared. The optical barrier properties, water contact angle, mechanical performance, water vapor transmission, antioxidant properties, thermal properties, and morphological structure of the films were compared. The results suggested that the tensile strength (TS) attained a maximum value of 64.63 MPa at a concentration of 4% EV. Moreover, water diffusion was prevented through the compact structure of the CS-EV edible film. Additionally, the two sides of the CS-EV film show different textures due to their different hydrophilicity/hydrophobicity. In particular, the films of CS possessed superior thermal stability, while those of CS-EV exhibited higher antioxidant activity.
Jianfei Zhu,Tingting Huang,Xiaomei Chen,Dongling Tian,Lei Wang,Ruiping Gao 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.11
In the current work, vanillin-conjugated chitosan stabilized emulsions (CSVAEs) were successfully prepared and its characterization and antibacterial properties were investigated. Under stirring condition, CSVAEs were produced by a Schiff base reaction between the vanillin aldehyde group and the chitosan active amino group. The CSVAEs were described through Fourier transform infrared spectroscopy, X-ray diffraction, ultraviolet spectrophotometry and thermogravimetric analysis, which demonstrated the generation of Schiff bases between vanillin and chitosan. Furthermore, the CSVAEs displayed differences at different pH values, indicating their potential as pH-responsive materials. By studying their release behavior, pH 4 was a critical point at which the properties of the CSVAEs changed. The antibacterial tests showed that the CSVAEs had good pH-responsive antibacterial abilities against Staphylococcus aureus and Escherichia coli.
Yuanfeng Wu,Xianghai Song,Shuai Li,Jiahui Zhang,Xinghui Yang,Pengxin Shen,Lijing Gao,Ruiping Wei,Jin Zhang,Guomin Xiao 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
[(CH3)2NH2][M3(BTC)(HCOO)4(H2O)].H2O (M–BTC, M = Mn, Ni, Co) were prepared under hydrothermal conditions and used as highly efficient catalysts for cycloaddition of CO2 with epichlorohydrin (ECH). The microstructure and physicochemical properties of the compounds were determined by PXRD, FT-IR, XPS, N2-adsorption, TG–DSC, NH3–TPD and CO2–TPD. 98.01% conversion of ECH and 96.05% selectivity to chloropropene carbonate was obtained over the Mn–BTC under the optimized reaction conditions (105 °C, 3.0 MPa, 9 h, 1.5 wt.% of ECH). Besides, the recyclability result exhibited the Mn–BTC compound can be utilized as least three times with a slight reduction in its catalytic ability. In addition, cycloaddition of CO2 with other epoxides and DFT calculation were also performed. The result exhibited the yield followed the order: ECH > 1, 2-epoxybutane > propene oxide > Allyl glycidyl ether, which was mainly determined by the energy of reaction.