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RISS 인기검색어
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- 저자 : Fanghui Li (검색결과 3 건)
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Two-dimensional metal organic framework for effective gas absorption
Cheng, Kaiwu,Li, Yaojia,Gao, Zhiguo,Chen, Fanghui,You, Chaoqun,Sun, Baiwang Elsevier 2019 Inorganic Chemistry Communications Vol.101 No.-
<P><B>Abstract</B></P> <P>Herein, crystalline metal organic framework (MOF) nanosheets have been fabricated through using a modified soft physical exfoliation method from bulk crystals of a layered MOF, [Cd(4,4′‑bpy)<SUB>2</SUB>(H<SUB>2</SUB>O)<SUB>2</SUB>](ClO<SUB>4</SUB>)<SUB>2</SUB>·(2,4′‑bpy)<SUB>2</SUB>·H<SUB>2</SUB>O (MOF-1), and fully characterized via transmission electron microscope (TEM), scanning electron microscopy (SEM), and atomic force microscope (AFM). The delaminated MOF-1 nanosheets with porous structure showed good growth potential in selective gas adsorption.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Using a modified soft physical exfoliation method from bulk crystals, we firstly synthesized a layered MOF nanosheets. </LI> <LI> The MOF-2 nanosheets revealed a superior absorption performance. </LI> <LI> The delaminated MOF nanosheets with porous structure showed good growth potential in selective gas adsorption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Effect of Magnesium Carbonate on Hydration and Hardened Properties of Portland Cement Paste
Fanghui Li,Zuqiang Xiong,Cheng Wang,Yuli Wang 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.12
The effects of magnesium carbonate on the setting time and compressive strength of Portland cement paste were studied when the content of magnesium carbonate was 0wt%, 0.5wt%, 1wt%, 2wt%, and 3wt% by the weight of cement. The influence mechanism was analyzed through combining with the tests of hydration heat, X-ray diffraction (XRD), differential thermal analysis-thermogravimetric analysis (DTA-TG), and scanning electron microscope (SEM). The results show that magnesium carbonate makes the setting time of cement paste shorten, and makes the compressive strengths of cement paste increase at 1 day and 7 days, but decrease at 28 days. The testing results of the heat of hydration, XRD, SEM, and DTA-TG show that magnesium carbonate promotes the formation of Ettringite (AFt) and the hydration of calcium silicate in the early stage when its content is less than 1wt%, but the addition of magnesium carbonate is unfavorable to the later hydration of Portland cement. Based on the above analysis, it is suggested that the content of magnesium carbonate is not more than 1wt%, which has good reference value for using magnesium carbonate to prepare early strength agent for cement paste.
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POD Analysis for modeling wind pressures and wind effects of a cylindrical shell roof
Fanghui Li,Xinzhong Chen 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.6
This paper presents a study on the effectiveness of the proper orthogonal decomposition (POD) technique for reconstruction of wind pressure field as applied to a cylindrical shell roof based on simultaneously measured wind pressure data. The influence of wind loading mode truncation on the statistics of dynamic pressures and wind load effects are investigated. The results showed that truncation of higher wind loading modes can have more noticeable influence on the maximum and minimum pressures that the standard derivation (STD) values. The truncation primarily affects the high-frequency content of the pressures. Estimation of background response using wind loading modes is more effective than the use of traditional structural modal analysis.
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