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11 results on '"Peng, Jincai"'

5. Effect of Synthesized Sol-Type Nano-SiO2 on the Mechanical Properties and Drying Shrinkage of Fly Ash–Slag-Based Geopolymer.

Author

Xu, Fu, Peng, Jincai, Si, Ruizhe, Li, Shuisheng, Yang, Dong, Luo, Zhengdong, Li, Xinyu, and Wang, Wu

Subjects
*COMPRESSIVE strength, *SOL-gel processes, *FLY ash, *MICROSTRUCTURE
Abstract

In this study, nano- SiO2 was synthesized using the sol-gel method to modify the properties of fly ash-slag geopolymers (FASGs). FASGs with six contents of sol-type nano- SiO2 (0, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5%) and two alkali dosages (5% and 7% of Na2O) were prepared. The influences of sol-type nano- SiO2 and alkali content on the compressive strength, flexural strength, drying shrinkage, and microstructure of FASG were studied. The results demonstrated that the early-age compressive and flexure strength of FASG can be enhanced by sol-type nano- SiO2 due to the improved microstructure and the reaction products. The improvement effect of sol-type nano- SiO2 on mechanical properties was more significant for FASGs with lower alkali dosages. The optimized content of sol-type nano- SiO2 in FASG was 0.2% for the mechanical properties. The addition of the sol-type nano- SiO2 can mitigate the drying shrinkage of the FASG when the content is lower than 0.4%. The sol-type nano- SiO2 can promote the formation of reaction products in FASG and result in a denser microstructure of FASG. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Intense single-band red upconversion emission in BiOCl:Er3+layered semiconductor via co-doping Ho3+

Author

Peng, Yuehong, Peng, Jincai, Han, Jiajun, Wang, Tianhui, Yin, Zhaoyi, Qiu, Jianbei, Wang, Qi, Yang, Zhengwen, and Song, Zhiguo

Abstract

Exploring a new tuning way to facilely realize single-band red emission in trivalent rare-earth ions (RE3+) doped upconversion (UC) materials is still desirable. In this work, the intense single-band red emission is achieved by co-doping only Ho3+in the BiOCl: Er3+under 1550 nm excitation. In the BiOCl layered host, co-doping Ho3+can further enhance the red emission and simultaneously suppress the green emission of Er3+, and thus obviously improve the red-to-green (R/G) ratio. It is found that Ho3+does not serve as energy trapping through the 5I6state as in traditional UC materials but acts as ET bridge (4S3/2, 2H11/2(Er3+) → 5F4, 5S2(Ho3+) → 4F9/2(Er3+)). The tuning mechanism of Ho3+is discussed in detail and further confirms through a comparative experiment. Our research gives an unusual perspective to tune the UC behavior of Er3+through co-doping Ho3+, which might be inspiring for achievement of single-band red UC emission.

Published
2020
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