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Eu3+/Tb3+ Co-Doped Cerium Oxide Transparent Nanocomposite for Color-Tunable Emission
Xiaoyan Li,Yunlong Yu,Xiangfeng Guan,Peihui Luo,Linqin Jiang,Zhiqiang Zheng,Dagui Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.10
Eu3+/Tb3+ co-doped nanocomposite containing CeO2 nanocrystals was successfully prepared by an in situ sol–gel polymerization approach. High-resolution transmission electron microscopy demonstrated the homogeneous precipitation of CeO2 nanocrystals among the polymethylmethacrylate (PMMA) matrix. The thermal stability and UV-shielding capability of the obtained nanocomposite were improved with increase of CeO2 content. The tuning of the emissive color from green and yellow to red can be easily achieved by varying the dopant species and concentration. These results suggested that the obtained nanocomposite could be potentially applicable in transparent solid-state luminescent devices.
Effect of grinding depth on fatigue fracture behaviors of 40Cr steel
Jianzhi Chen,Guochao Li,Ning Li,Xiaoyan Guan,Yan Wang,Zhen Xu,Xiaoxiang Bai,Honggen Zhou 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
40Cr steel specimens were ground with different grinding depth (a p ) varied from 0 μm to 35 μm, and the rotary bending fatigue behaviors of ground specimens were investigated. Fatigue results show that the fatigue life of ground specimens exhibits an increasing first and then decreasing tendency with the increment of a p , the specimen with a p of 15 μm exhibits the highest fatigue life, and the effect of a p on fatigue damage behaviors of ground specimens were analyzed from aspects of surface roughness, work hardening and compressive residual stress. Multiple crack initiation of fatigue fractured specimens was observed, the number of crack initiation sites tends to increase first and then decrease with increasing a p . The relationship model between the fatigue striation width and the a p was established, and the prediction deviation of the model is ~2.08 %. It is expected that the model may provide new clues for optimizing the grinding process of mechanical parts.