Magnetic a-Fe2O3, γ-Fe2O3 and Fe3O4 were prepared by facile calcination under different temperature from K4[Fe（CN）6] as raw materials, in which the calcined products are a-Fe2O3, Fe3O4 and y-Fe203 at 400 or 700, 50...Magnetic a-Fe2O3, γ-Fe2O3 and Fe3O4 were prepared by facile calcination under different temperature from K4[Fe（CN）6] as raw materials, in which the calcined products are a-Fe2O3, Fe3O4 and y-Fe203 at 400 or 700, 500, and 600 ℃, respectively. The as-prepared compounds were characterized by X-ray powder diffraction and scanning electron microscopy, and their magnetic behavior at room temperature was also studied. This method provided a simple approach to prepare different polymorphic forms of magnetic iron oxides, which may have potential applications in magnetic science, magnetic composite materials, magnetic core, magnetic separation and medical diagnostics.展开更多
The plane-wave pseudopotential function method, based on density-functional theory, has been used to calculate the adsorption, electronic band structures, orbitals and optical absorption spectrum of [Fe（CN）6]^4- on ...The plane-wave pseudopotential function method, based on density-functional theory, has been used to calculate the adsorption, electronic band structures, orbitals and optical absorption spectrum of [Fe（CN）6]^4- on TiOz anatase（101） surface. Our calculations reveal that the surface-modified anatase system has large adsorption energy and a much narrower band gap. [Fe（CN）6]^4- adsorption on the （101） surface could lead to a large red shift of the anatase optical absorption threshold, which extends into a visible region significantly. The calculated results are in agreement with the experiment and other theoretical studies reasonably. It is very important for the understanding and further development ofphotovoltaic materials that are active under visible light.展开更多
Polarization curves of copper were measured in NH 3·H 2O media containing K 3Fe(CN) 6. Components of passive film were analyzed by XPS. Relation of polishing rate with corrosion current density was investigated d...Polarization curves of copper were measured in NH 3·H 2O media containing K 3Fe(CN) 6. Components of passive film were analyzed by XPS. Relation of polishing rate with corrosion current density was investigated during CMP. Copper can be passivated in the slurry and main component of passive film is Cu 4Fe(CN) 6. Relation of polishing rate with corrosion current density is linear direct ratio and expressed as R = KJ corr during CMP. Coefficient K varies with different slurry systems but is constant under experimental conditions, which does not vary with NH 3·H 2O, K 3Fe(CN) 6, γ Al 2O 3 concentrations, polishing pressures and rotative rate in a slurry system during CMP.展开更多
A rapid and sensitive flow-injection chemiluminescence（CL） method for the determination of glipizide was developed on the basis of finding that glipizide can enhance the CL intensity of the luminol-K3Fe（CN）6 syste...A rapid and sensitive flow-injection chemiluminescence（CL） method for the determination of glipizide was developed on the basis of finding that glipizide can enhance the CL intensity of the luminol-K3Fe（CN）6 system.In optimum condition,the increased CL intensity was directly proportional to the concentration of glipizide in the range from 4.0×108 g/mL to 1.0×106 g/mL and the detection limit was 1.0×108 g/mL glipizide.The relative standard deviation（RSD） of the developed method was 2.1% with 11 repeated measurements of 1.0×107 g/mL glipizide.The developed method has been successfully applied to the analysis of glipizide in its pharmaceutical preparations.展开更多
基金supported by the Funds of Fujian province department of education(No.JA14199)
文摘Magnetic a-Fe2O3, γ-Fe2O3 and Fe3O4 were prepared by facile calcination under different temperature from K4[Fe（CN）6] as raw materials, in which the calcined products are a-Fe2O3, Fe3O4 and y-Fe203 at 400 or 700, 500, and 600 ℃, respectively. The as-prepared compounds were characterized by X-ray powder diffraction and scanning electron microscopy, and their magnetic behavior at room temperature was also studied. This method provided a simple approach to prepare different polymorphic forms of magnetic iron oxides, which may have potential applications in magnetic science, magnetic composite materials, magnetic core, magnetic separation and medical diagnostics.
基金the Scientific and Technology Foundation of Fuzhou University and the Key Project of Fujian Province (2005HZ01-2-6)
文摘The plane-wave pseudopotential function method, based on density-functional theory, has been used to calculate the adsorption, electronic band structures, orbitals and optical absorption spectrum of [Fe（CN）6]^4- on TiOz anatase（101） surface. Our calculations reveal that the surface-modified anatase system has large adsorption energy and a much narrower band gap. [Fe（CN）6]^4- adsorption on the （101） surface could lead to a large red shift of the anatase optical absorption threshold, which extends into a visible region significantly. The calculated results are in agreement with the experiment and other theoretical studies reasonably. It is very important for the understanding and further development ofphotovoltaic materials that are active under visible light.
文摘Polarization curves of copper were measured in NH 3·H 2O media containing K 3Fe(CN) 6. Components of passive film were analyzed by XPS. Relation of polishing rate with corrosion current density was investigated during CMP. Copper can be passivated in the slurry and main component of passive film is Cu 4Fe(CN) 6. Relation of polishing rate with corrosion current density is linear direct ratio and expressed as R = KJ corr during CMP. Coefficient K varies with different slurry systems but is constant under experimental conditions, which does not vary with NH 3·H 2O, K 3Fe(CN) 6, γ Al 2O 3 concentrations, polishing pressures and rotative rate in a slurry system during CMP.
基金financial support from Institute of Analytical Sciences,Xi'an
文摘A rapid and sensitive flow-injection chemiluminescence（CL） method for the determination of glipizide was developed on the basis of finding that glipizide can enhance the CL intensity of the luminol-K3Fe（CN）6 system.In optimum condition,the increased CL intensity was directly proportional to the concentration of glipizide in the range from 4.0×108 g/mL to 1.0×106 g/mL and the detection limit was 1.0×108 g/mL glipizide.The relative standard deviation（RSD） of the developed method was 2.1% with 11 repeated measurements of 1.0×107 g/mL glipizide.The developed method has been successfully applied to the analysis of glipizide in its pharmaceutical preparations.
