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- 저자 : Zhen‑Jie Guan (검색결과 3 건)
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Patrick Mountapmbeme Kouotou,Guan-Fu Pan,Jun-Jie Wenga,Shi-Bin Fan,Zhen-Yu Tian 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The effective evaluation of the catalytic performance of Co3O4 supported on an inert carrier wasinvestigated toward the deep oxidation of light olefins. Thin Co3O4 films were deposited on grid mesh ofstainless steel using one-step chemical vapor deposition method. The as-deposited materials werecharacterized in terms of structure, morphology and composition. Co3O4 crystals with cubic spinelstructures composed of Co2+, Co3+ and nucleophilic oxygen species (O2 ) were obtained. The catalyticresults indicated that Co3O4 supported on steel mesh was highly active to enable the completeconversion of C3H6 and n-C4H8 with a Mars-van Krevelen type mechanism.
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Na Chen,Dan Li,Xin‑Yi Wang,Zhen‑Jie Guan,Jian‑Tang Jiang,Kang‑Jun Wang 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.4
Magnetic composites have received increasing attention for electromagnetic wave absorption (EMA) applications. However,the practical EMA performance of the materials is severely hampered by mismatching impedance characteristics and finiteelectromagnetic attenuation capacity. Controlling the components and building the architecture fabrication is necessary tosolve these issues. Herein, a series of Fe3O4,Fe3O4&Fe and Fe microspheres with flower-like hierarchical structures wereconstructed through a solvothermal method followed by an annealed process. This hierarchical structure and the synergyeffect of dielectric dissipation and magnetic loss capacity offer Fe3O4a perfect impedance matching, providing an excellentEMA performance of an effective absorption bandwidth (EAB) of 4.0 GHz and a reflection loss (RL) of 67.9 dB. Meanwhile,the coordination of the hierarchical structures and the multiple components endow Fe3O4&Fe composites with an EAB aswide as 5.7 GHz (9.0–14.7 GHz) and a RL as strong as 78.7 dB at 1.88 mm, which covers 75% X and 45% Ku bands. Sucha remarkable lightweight and broad properties is due to the decent X band impedance matching and appropriate attenuationcapacity. Therefore, this work highlights the significant of regulating the hierarchical structure and components to enhancethe EMA performances.
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Designing Co7Fe3@TiO2 Core–Shell Nanospheres for Electromagnetic Wave Absorption in S and C Bands
Na Chen,Jian‑Tang Jiang,Zhen‑Jie Guan,Shao‑Jiu Yan,Liang Zhen,Cheng‑Yan Xu 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.5
Ferromagnetic-dielectric nanocomposites have attracted extensive interests for its high electromagnetic wave absorption(EMA) performance due to the synergetic effects between different components. Herein, we report the design of core–shellstructured Co7Fe3@TiO2 composite particles, which are subsequently annealed in H2/Ar atmosphere to further improve itsEMA performance. The introducing of TiO2dielectric shell together with hydrogen annealing contributes greatly to theelectromagnetic properties due to the increased conductivity and enhanced ferromagnetic resonance. Excellent EMA performanceis achieved in S (2–4 GHz) and C (4–8 GHz) bands in coatings using Co7Fe3@TiO2 as absorbents. Apart from thehigh EMA efficiency, the location of EMA band can be tailored in a wide range through regulating the coating thickness. Specifically, an effective absorption band of 2.0 GHz in C band at a thickness of 2.62 mm, and an effective absorption bandof 1.7 GHz are achieved in S band at thicknesses of 4.0–5.0 mm. The excellent electromagnetic properties are ascribed tothe effective complementary between dielectric loss and ferromagnetic loss.
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