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RISS 인기검색어
- 검색키워드
- 저자 : N.M. Deraz (검색결과 3 건)
- 무료
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Magnetic behavior and physicochemical properties of Ni and NiO nano-particles
N.M. Deraz 한국물리학회 2012 Current Applied Physics Vol.12 No.3
A series of nano-crystalline Ni/NiO particles was synthesized by a combustion route depending upon the glycineenitrate process. The as prepared samples were characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), transmission electron micrograph (TEM), nitrogen adsorption isothems at 77 K and vibrating sample magnetometer (VSM) techniques. The XRD results revealed that the Ni powder crystallizes was formed with the cubic phase when the molar ratio of glycine to nitrate is 1.5. Above or below that molar ratio, NiO phase coexists as an impurity along with the Ni phase. The SEM and TEM measurements of the as synthesized powders showed that the particles are irregular in shapes and have porous morphology. Increasing the ratio between glycine and Nienitrate resulted in slightly agglomeration and grain growth of nano-particles with subsequent decrease in the value of surface area depending upon high combustion heat. The magnetization value of Ni measured at room temperature is very close to the value observed for commercial Ni powder. A series of nano-crystalline Ni/NiO particles was synthesized by a combustion route depending upon the glycineenitrate process. The as prepared samples were characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), transmission electron micrograph (TEM), nitrogen adsorption isothems at 77 K and vibrating sample magnetometer (VSM) techniques. The XRD results revealed that the Ni powder crystallizes was formed with the cubic phase when the molar ratio of glycine to nitrate is 1.5. Above or below that molar ratio, NiO phase coexists as an impurity along with the Ni phase. The SEM and TEM measurements of the as synthesized powders showed that the particles are irregular in shapes and have porous morphology. Increasing the ratio between glycine and Nienitrate resulted in slightly agglomeration and grain growth of nano-particles with subsequent decrease in the value of surface area depending upon high combustion heat. The magnetization value of Ni measured at room temperature is very close to the value observed for commercial Ni powder.
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Precipitation–deposition assisted fabrication and characterization of nano-sized zinc manganite
N.M. Deraz,Ahmed A. Abdeltawab,M.M. Selim,O. El-Shafey,A.A. El-Asmy,Salem S Al-Deyab 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Catalytic and structural investigations of nano-sized zinc manganite (ZnMn2O4) powders have been determined. These manganites were prepared by precipitation–deposition route followed by heating at 400, 600, and 800℃. The final products were characterized X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX). The catalytic activity of the as prepared systems was measured by the hydrogen peroxide decomposition in aqueous solution over the solid surface at 30–50℃. The results showed that the calcination temperature affects the different characteristics of the investigated solids.
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Processing and characterization of nano-magnetic Co0.5Ni0.5Fe2O4 system
N.M. Deraz,Omar H. Abd-Elkader 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Various techniques such as X-ray diffraction (XRD), infrared (IR) spectroscopy, scanning electron micrographs (SEM), energy dispersive X-ray (EDX) and a vibrating sample magnetometer (VSM) were used to investigate the structural, morphological, and magnetic properties of spinel Co0.5Ni0.5Fe2O4 system. XRD and IR analyses enabled us to determine the functional group and structural parameters of Co0.5Ni0.5Fe2O4. EDX measurements showed the concentrations of O, Ni, Fe, and Co species involved in Co0.5Ni0.5Fe2O4 specimen from the uppermost surface to the bulk layers. The magnetization and coercivity of the as synthesized composite were 77 emu/g and 128 Oe, respectively.
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