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61.
In this paper the formation mechanism of iron macro-spheres in
a plasma medium is dealt with, including the conditions under which such
spheres are formed. The geometry of the spheres referred to above
depends on the main technological parameters involved in the production
of pores. Conditions under which pores occur within macro-spheres are
also established. The radii of these pores are sensitive to the velocity
distribution within the plasma jet section 相似文献
62.
Syntheses, Structure Determination and Reactions of Phosphine Substituted Derivatives of Fe3(CO)9(μ3-CF)2 Photolysis of Fe3(CO)9(μ3-CF)2 1 in the presence of acetonitrile 2a or benzoenitrile 2b results in the substitution of a single carbonyl ligand by a nitrile ligand yielding Fe3(CO)8(CH3CN)(μ3-CF)2 3a and Fe3(CO)8(C6H5CN)(μ3-CF)2 3b, respectively. The acetonitrile ligand in 3a can be easily replaced by trimethyl-phosphine 4a or triphenylphosphine 4b . The monosubstituted compounds Fe3(CO)8(PR3)(μ3-CF)25, R = CH3 a, R = C6H5, b are obtained as major products besides a small amount of the disubsituted products Fe3(CO)7(PR3)2(μ3-CF)2 6. The structure of 5a has been elucidated by a single crystal X-ray structure determination. Thermal ligand substitution in 1, however, results in the formation of a mixture of mono-, disubstituted, and trisubstituted products, in which 6b is the major product for diphenylphosphine. 5a reacts with ethyne 7 forming a phosphine substituted diferra-allyl-cluster Fe3(CO)7(PR3)(μ3-CF)(μ3? CF? CH? CH) 8. The structure of one isomere of 8 has been determinated by X-ray crystallography. 相似文献
63.
根据Fe(Ⅲ)、Mo(Ⅵ)对H2O2氧化邻氨基酚的催化反应速率不同,结合流动注射停留技术,建立了同时测定Fe(Ⅲ)、Mo(Ⅵ)的速差动力学分光光度法.测定铁和钼的线性范围分别为0.1~2.5μg/mL和0.5~15μg/mL.除W(Ⅵ)的允许量较小外,其它离子不干扰测定.用本法测定了合成样液中铁和钼含量,结果满意. 相似文献
64.
一阶导数吸光光度法同时测定纯硅中铁和铝的研究 总被引:4,自引:0,他引:4
提出了用一阶导数光光度法同时测定铁和铝的方法,在pH6.5乙二胺缓冲溶液中,乳化剂OP存在下,Fe^3+Al^3+与络天青S形成Fe^3+,Al^3+-CAS-OP三元络合物,络合物一阶导数光谱等吸收点分别在606.2,638.0nm记录混合体系在两波长处一阶导数数值可以分别测定铝,铁含量,互不影响,铁,铝含量分别在1.0~16μg/25ml,0.3~10μg/25ml范围内呈良好线性,用于测定纯 相似文献
65.
Renáta Oriňáková Hans-Dieter Wiemhöfer Jürgen Paulsdorf Veronika Barinková Anna Bednáriková Roger M. Smith 《Journal of Solid State Electrochemistry》2006,10(7):458-464
The electrochemical impedance method was applied during the electrochemical deposition of a binary Ni–Co coating on iron powder in a fluidised bed electrode system. The influence of the suspension density on the charge transfer in the course of the electro-deposition process was studied. At a potential of −900 mV (vs. Ag/AgCl/3 M KCl), when the binary Ni–Co layer was formed, the impedance data were characterised by two semicircles with the semicircle at high frequencies being larger in magnitude. A contribution of the diffusion process to the overall current was observed. The optimal suspension density for the charge transfer in the bed was 10×10−3–15×10−3 (i.e., 4–6 g of iron powder in 50 ml of electrolyte). The most probable mechanism of the charge transfer for the studied concentrations of powder particles is the convective mechanism. The iron particles dispersed in the electrolyte were considered to act as either a depolariser or an additional working electrode depending on the applied electrode potential and on the suspension density. 相似文献
66.
Synthesis and characterization of monodisperse magnetic composite particles for magnetorheological fluid materials 总被引:2,自引:0,他引:2
Jung-Bae Jun Seong-Yong Uhm Jee-Hyun Ryu Kyung-Do Suh 《Colloids and surfaces. A, Physicochemical and engineering aspects》2005,260(1-3):157-164
Monodisperse magnetic composite particles (MCP) were prepared and characterized for a study of magnetic field-responsive fluids. Magnetic composite particles used are iron oxide-coated polymer composite particles, which were synthesized through in situ coating of iron oxide onto pre-existing polymer particles by the reduction of ferrous fluids. For a uniform and bulk coating of iron oxide, the porous structure was introduced into the substrate polymer particles through a two-step seeded polymerization method. Moreover, surface cyano-functionality was born from acrylonitrile unit of substrate polymer and it played an important role in obtaining successful uniform coating. The structure of the composite particle was analyzed by using a thermo gravimetric analysis (TGA) and a X-ray diffraction (XRD) analysis. The magnetization property of the particle was also observed. Then, the rheological properties of monodisperse magnetorheological (MR) suspensions of magnetic composite particles were examined under a magnetic field using a parallel-plate type commercial rheometer. From the rheological measurements, it was found that MR properties of the magnetic composite suspensions are dependent on the iron oxide content and the fluid composition. 相似文献
67.
In this work, a downsized flow set up designed based on multicommutation concept for photometric determination of iron(II)/iron(III) and nitrite/nitrate is surface water is described. The flow system network comprised a set of three-way solenoid valves, reaction coil and a double-channel flow cell, which were nested in order to obtain a compact and small-size instrument. To accomplish the downsizing requirement light source (LED) and radiation detection (phototransistor) were coupled to the flow cell. In order to demonstrated the effectiveness of the system, the photometer methods based on Griess reaction and 1-10-phenantroline for nitrite and iron(II) determination, respectively, were selected. Under computer control the set up provided facilities to handle four reagent solutions employing a single pumping channel, thus permitting also the determination of nitrate and iron(III) after its reduction to nitrite and to iron(II), respectively. The overall system performance was demonstrated working several days running standard solution, no significant variation of base line, linear response range and slop (less than 1%) were observed. The usefulness of the downsized system was ascertained by analyzing a set of surface water. Aiming to access the accuracy sample were also analyzed employing reference procedures and no significant difference at 95% confidence level were observed for the four analytes. Other profitable features such as analytical throughput of 40 determination per hour; relative standard deviation of 1%; linear response range between 50 and 300 μg l−1 for nitrite and nitrate, 0.5-6.0 mg l−1 iron(II) and iron(III); low reagent consumption 75 μg for nitrate/nitrite and 0.6 mg for iron(II)/iron(III) per determination; and 2.4 ml waste generation per determination were also achieved. 相似文献
68.
69.
Pd(OAc)2/FePc催化环己烯氧化合成环己酮的研究 总被引:6,自引:0,他引:6
考察了几种Fe-大环配合物与Pd(OAc)2组成的双组分催化体系,在乙腈酸性水溶液中环己烯经合成环己酮的催化活性,实验结果表明,其中以酞菁失(FePc)与Pd(OAc)2组成的催化体系活性最高,而FeTPPCl与Pd(OAc)2催化体系,虽然催化活性较高,但催化剂的稳定性较低,各种因素对Pd(OAc)2/FePc催化活催化影响的研究结果指出,在无水和酸存在的非水溶液中,Pd(OAc)2/FePc对 相似文献
70.
本文利用电感耦合等离子体原子发射光谱(ICP-AES)多色仪的扫描功能,用C语言编制了Kalman滤波程度软件包,用该软件包对铁基体中26种痕量元素进行了回收率试验,并对标准碳素钢样中13种痕量元素进行了测定,结果表明Kalman滤波完全适用于复杂谱线基体中的多种元素同时分析。 相似文献