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- 저자 : Kafi-Ahmadi Leila (검색결과 3 건)
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Abdolali Alemi,Leila Kafi-Ahmadi,Ali Akbar Khandar,Amin Salem 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Glass in the system 5In2O3.94Na2B4O7 was fabricated via a melt quenching technique. The amorphous nature of the quenched glass was confirmed by X-ray powder diffraction. The infrared spectrum shows no boroxol ring formation in the structure of this glass. Differential thermal analysis shows a glass transition temperature of 696 oC and a crystallization temperature of 1151 oC. A cerium–zirconium mixed oxide Ce0.75Zr0.25O2 and Eu-doped cerium-zirconium mixed oxide were obtained by a solid-state method. Then the glass powder and Eu-doped cerium-zirconium mixed oxide were mixed. The mixture was heated in a crucible. The glass-ceramic sample was obtained by pouring the melts onto stainless steel plates. The samples obtained were annealed at 450 oC for 1 h to remove the thermal strain. Gas phase catalytic oxidation of toluene was studied over these nanostructures. The results showed that the catalytic activity of Eu0.01Ce0.74Zr0.25O1.995 was higher than Ce0.75Zr0.25O2 for conversion of toluene. Differential thermal analysis for a glass-ceramic sample shows a glass transition temperature of 648 oC and a crystallization temperature of 1134 oC. A scanning electron microscopy study of the glass-ceramic indicates that the crystallized glass consists of crystals with an average diameter of about 86 nm dispersed in glassy regions.
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Shafaati Saideh,Hakimyfard Alireza,Tahmasebi Nemat,Kafi-Ahmadi Leila,Khademinia Shahin 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Solid state synthesis of some new Mx-CuSb2O6-CuSb2O4 (Mx=None, Fe, Ni, Ce and Yb) nanocomposites was introduced in the present research study. The physicoelectrochemical properties of synthesized nanocomposites were investigated by different techniques, such as XRPDT, Rietveld, FTIR, FESEM, UV-Vis, VSM, CV and EIS. Rietveld analysis data revealed that all of the synthesized samples display the monoclinic crystal phase with the space group of P21/n. The estimated direct band gap energy of the obtained nanocomposites was in the range of 2.0 to 2.7 eV, which confirms that are active in ultraviolet-visible region. The VSM data indicated that the maximum magnetic behavior was found for Ni doped — Cu−Sb−O nanocomposite. Also, the catalytic performance of nanocomposites to synthesis 2-amino-4H-benzochromenes under ultrasonic and microwave was investigated. The considered parameters, such as solvent type, catalyst amount and reaction time, influencing the yield of the 4H-benzochromene reaction were studied. The maximum yield for the synthesizing of the 4H-benzochromene compounds was obtained when EtOH was used as the reaction solvent. The catalyst amount and reaction time were 15 mol% and 8 min, respectively, under ultrasonic conditions, while benzaldehyde was used as an aldehyde derivative.
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Mirzazadeh Amene,Hakimyfard Alireza,Tahmasebi Nemat,Kafi-Ahmadi Leila,Khademinia Shahin 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.5
This paper presented the synthesis of Mx-ZnBi2O4–Bi2O3 (Mx = Fe, Co, Ni, Eu, and Ho) nanomaterials by a one-pot facile solid-state method at 650 ˚C for 10 h. Rietveld analysis data displayed the formation of ZnBi2O4–Bi2O3 composite in which ZnBi2O4 was crystallized as a main phase in orthorhombic crystal system with Pmmm space group. The investigation of optical properties indicated that doping the metal ions into the ZnBi2O4–Bi2O3 nanocomposite decreased the band-gap energy amount. Results indicated that the synthesized samples displayed paramagnetic behavior without any preferred magnetization direction. However, the data indicated that Co3+-doped ZnBi2O4 showed highest magnetization value. In addition, cyclic voltammetry (CV) data and low EIS values revealed a pseudocapacitor behavior of the synthesized samples. Biginelli reaction to synthesize heterocyclic DHPMs compounds was applied to evaluate the catalytic performance of the samples. Results indicated that the synthesis yields of DHPMs at optimum condition were 92% and 96% for undoped and Eu-doped ZnBi2O4–Bi2O3, respectively.
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