Bimetallic nanoalloys: Preparation, characterization and their catalytic activity

Singh, Gurdip; Kapoor, Inder Pal Singh; Dubey, Shalini

doi:10.1016/j.jallcom.2009.02.024

Cited by 59 publications

(36 citation statements)

References 19 publications

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“…For instance, investigated by the TGA/ DSC method, Singh et al [13] observed a reduction in the ignition delay for bimetallic nanoalloys of Ni mixed with Cu, Co and Zn. Some studies have shown that nano aluminum particles (nAl) in combination with copper possessed some excellent properties and can be potentially used in resistance welding electrodes, electrical connectors, lead frames and the metastable intermolecular composites (MICs) [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exothermic characteristics of aluminum based nanomaterials

et al. 2015

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Nano-structured energetic materials have been recently proposed as novel energy storage media where the exothermic reaction is the key to control the heat release process. The properties of nanoalloys, which can be engineered not only by the particle size, but also by varying their elemental compositions, are very appealing. This work conducts a comparative experimental study of the exothermic characteristics of two nanomaterials in the air, aluminum nanoparticles (nAl) and aluminum-copper nanoalloys (nano-AlCu) based on TGA/DSC studies. The results show that the general exothermic characteristics of nano-AlCu are very similar to that of nAl but the nano alloy is more reactive. The nano-AlCu oxides and ignites at lower temperature, and influenced by the heating rate. An early ignition is found for both nanomaterials, and melting of the nano-alloy is believed to be responsible for its early ignition.

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Section: Introductionmentioning

confidence: 99%

Exothermic characteristics of aluminum based nanomaterials

et al. 2015

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“…For bi-metal alloy nanoparticles, however, there is only very limited investigations, partly due to the difficulties of producing well-controlled metallic alloy particles [19]. Limited quantities of Ni-Cu, Ni-Co and Ni-Zn alloy nanoparticles were produced by hydrazine reduction of metal chloride in ethylene glycol by Singh et al [20], and a clear reduction in the ignition delay was observed. However there is still no detailed study of the thermal-chemical kinetics of bimetallic alloy nanoparticles, especially Al-Cu, and their properties in relation to the bulk behavior and individual compositional elements are still unclear.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, alloy nanoparticles were fabricated by the electrical explosion of wires (EEW) method, which is a process of explosive destruction of a metal wire under the action of high density current. It has been successfully used to produce various pure metal and metal oxide particles such as Al, Fe, Ni, Si and Fe2O3 [20][21][22][23][24], as well as a few alloy nanoparticles (i.e., Al-Cu, Al-Ni) [25]. For alloy particles, coated metal wires were generally used where one metal component was electrodeposited onto the surface of another metal wire and EEW was subsequently applied [25].…”

Section: Introductionmentioning

confidence: 99%

Thermal-Chemical Characteristics of Al–Cu Alloy Nanoparticles

et al. 2015

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This work investigated the oxidation, ignition and thermal reactivity of alloy nanoparticles of aluminum and copper (nAlCu) using simultaneous thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) method. The microstructure of the particles was characterized with scanning electron microscope (SEM) and transmission electron microscope (TEM), and the elemental composition of the particles before and after the oxidation was investigated with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD).The particles were heated from room temperature to 1200 o C under different heating rates from 2 to 30 K/min in the presence of air. The complete oxidation process of the nAlCu was characterized by two exothermic and two endothermic reactions, and the reaction paths up to 1200 o C were proposed. An early ignition of nAlCu, in the temperature around 565 o C, was found at heating rates ≥ 8 K/min. The eutectic melting temperature of nAlCu was identified at ~ 546 o C, which played a critical role in the early ignition. The comparison of the reactivity with that of pure Al nanoparticles showed that the nAlCu was more reactive through alloying.

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“…The high content of oxygen in AP (54.5% w/w) and its high loading in a matrix polymer make AP an exceptional and irreplaceable oxidative compound in composite rocket propellants [2]. The characteristics of the thermal decomposition of AP affect the performance of solid rocket propellants and are remarkably sensitive to the presence of impurities [3][4][5][6]. Based on the specification of defence standard requirements of AP for military uses, the chlorate concentration should not exceed 0.02% (200 µg·g −1 ) [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Application of Stabilized-Ni/Fe Bimetallic Nanoparticles for the Selective Elimination of Chlorate Impurity in Military Grade Ammonium Perchlorate

Eslami

Juibari

Hosseini

et al. 2017

Cent. Eur. J. Energ. Mater.

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Ammonium perchlorate (AP) is used as the most common oxidizer in composite solid propellants. Control of chlorate impurity in military grade ammonium perchlorate is important, since it has an undesirable effect on the thermal decomposition of ammonium perchlorate. In this work stabilized Ni/Fe bimetallic nanoparticles (S-Ni/Fe NPs) were synthesized using the borohydride reduction method (BRM) in the presence of starch as a stabilizing agent, and they were characterized by field emission scanning electron microscopy (SEM), and their X-ray diffraction pattern (XRD). The results showed that the synthesized S-Ni/Fe bimetallic nanoparticles were spherical in shape and had nearly uniform distribution, with particle sizes of 20-50 nm. The prepared nanoparticles were then used for the selective elimination of chlorate impurity in ammonium perchlorate. The main factors controlling the elimination of chlorate, such as the initial pH of the solution, dosage of S-Fe/Ni NPs, initial chlorate and perchlorate concentrations, reaction temperature, and reaction time, were optimized by using an experimental design based on the Taguchi method. An L9 orthogonal array (L9-OA) was used to design experiments with four 4-level factors (3 4 ). Under the optimal conditions, i.e., pH 6.5, at 30 °C and a dosage of 50 mg S-Ni/Fe NPs, chlorate was eliminated with nearly 100% efficiency in 50 mL of a solution containing 2.0 µg·mL −1 and 100 µg·mL −1 of chlorate and perchlorate, respectively, without change in perchlorate concentration.

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Bimetallic nanoalloys: Preparation, characterization and their catalytic activity

Cited by 59 publications

References 19 publications

Exothermic characteristics of aluminum based nanomaterials

Exothermic characteristics of aluminum based nanomaterials

Thermal-Chemical Characteristics of Al–Cu Alloy Nanoparticles

Synthesis, Characterization, and Application of Stabilized-Ni/Fe Bimetallic Nanoparticles for the Selective Elimination of Chlorate Impurity in Military Grade Ammonium Perchlorate

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