Optimum synthesis conditions of nanometric Fe50Ni50 alloy formed by chemical reduction in aqueous solution

Abstract

In the present article, various nanometric Fe 50 Ni 50 alloys were synthesized by chemical reduction of the corresponding metal ions, with hydrazine in an aqueous solution. Process variables of reaction temperature, pH of the hydrazine solution and concentration of metal ions were varied in order to determine the optimum synthesis conditions regarding quality, productivity and cost. It is found that pH of hydrazine solution, at low concentration of metal ions, is the most crucial variable affecting the reaction rate, average crystallite and particle sizes of the synthesized nanometric Fe 50 Ni 50 alloy, followed by the total concentration of metal ions. Thus, increase of pH of hydrazine solution acts as an efficient stabilizer in reducing the particle size. On the contrary, at high concentration of metal ions, the structural characteristics of the nanometric Fe 50 Ni 50 alloy are almost insensitive to reaction temperature and pH of hydrazine solution, but the reduction rate is remarkably sensitive to reaction temperature. Based on these results, it is decided that a reaction temperature of 80 • C, pH of the hydrazine solution of 12•5 and concentration of metal ions of 0•6 M represent the optimum synthesis conditions. The role of pH of hydrazine solution in reducing the alloy's average particle size as well as efficient stabilizer confirms tremendous effect of synthesis conditions on the alloy structure and therefore, the importance of this study for industrial production of nanometric Fe 50 Ni 50 alloy.

Nanocrystalline Fe‐Ni alloy/polyamide 6 composites of high mechanical performance made by ultrasound‐assisted master batch technique

“…This suggests that each spherical particle is nanostructured, i.e. it is composed of several nanocrystallites, as previously reported [9,18]. Based on XRD, EDS, and FE-SEM results, it is concluded that the chemically synthesized black particles are nc Fe 40 Ni 60 submicron-sized particles.…”

“…Characteristics of nc Fe 40 Ni 60 Particles Figure 1 shows the XRD pattern of the chemically synthesized particles. The four characteristic peaks for the disordered FCC g-Fe-Ni taenite phase 2h 5 44.05 , 51.3 , 75.6 , and 91.5 , marked by the Miller indices (111), (200), (220), and (311), respectively, are observed [9,18]. This reveals that the synthesized particles are pure Fe-Ni alloy.…”

“…The synthesis of the nc Fe 40 Ni 60 particles was done according to the protocol reported in our previous work . Briefly, FeCl 2 and NiCl 2 .6H 2 O were dissolved in distilled water to form aqueous solution of 0.6 M with a [Fe 2+ ]/[Ni 2+ ] ratio of 4:6.…”

Synthesis of Ni/Al2O3 catalysts via alkaline polyol method and hydrazine reduction method for the partial oxidation of methane

“…The optimum synthesis parameters such as the reaction time, reduction temperature, reducing agent type, ratio of reducing agent to surfactant, and pH could be adjusted quickly to keep the nanoparticles' size and shape under control [38]. Researchers indicate that the reduction rate, crystallite, and particle sizes of the synthesized materials are mainly affected by the synthesis parameters [42]. Among the possibilities mentioned in the literature, most of the studies focused on the variations of the particle characteristics by changing the source material's concentration [43], hydrazine [44], and the surfactant [29].…”

Influence of Synthesis Parameters of FeNi3 Alloy Nanoparticles Obtained by Chemical Reduction Method in Aqueous Solution

“…Therefore, additional efforts are needed to control experimental conditions for the synthesis of magnetic nanoparticles with controlled shape and size. FeNi 3 alloy nanoparticles were prepared by various methods such as: mechanical alloy [6,7], chemical reduction in solution [8,9], sol-gel combined with H 2 reduction [10], sol-gel autocombustion [11], sol-gel method [12], sol-gel route with benzyl alcohol [13], coprecipitation [14], chemical reduction based on the polyol process [15], reverse micelle technique [16], thermal decomposition of carbonyl compounds [17], hydrothermal reduction [18], to microwave assisted synthesis [19].…”