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Abstract: The present paper reports the production of nano-tungsten particles by the wire explosion process. The impact of ambient medium on the size of the particles produced is examined. The ambient gas with a high cooling rate is observed to result in smaller particles. Wide-angle X-ray diffraction (WAXD) studies were conducted to understand the chemical constituents and phases present in the produced powder. The composition of the material was studied through the energy dispersive analysis by X-rays (EDAX). The size of the particles was measured using a transmission electron microscope (TEM) and particle size distribution was determined by adopting a log-normal distribution. An attempt has been made to understand the temperature at which saturation ratio is maximum and when nucleation commences and leads to formation of nano-particles. [Copyright &y& Elsevier]

Abstract: The nano-aluminium particles were produced in different atmospheres by the wire explosion process. The size of the particles was measured using Transmission Electron Microscope (TEM) studies and particle size distribution analyses were carried out by adopting log-normal distribution. The nano-powders produced in different atmospheres were characterized through wide angle X-ray studies and energy dispersive analysis by X-rays (EDAX). It is realized that nano-aluminium particles produced in binary gas (argon–helium) atmosphere have lower particle size. [Copyright &y& Elsevier]

Abstract: The nano aluminium particles were produced in different ambience by the wire explosion process. The influence of pressure in the exploding wire chamber on the size of the particles was analyzed. Certain physico-chemical diagnostic studies, viz., wide angle X-ray diffraction (WAXD), thermo-gravimetric differential thermal analysis (TG–DTA) studies were carried out to characterize the produced nano aluminium powder. The compositions of the material were characterized through the energy dispersive analysis by X-ray (EDAX) results. The size of the particles was measured using transmission electron microscope (TEM) studies and particle size distribution analyses were carried out by adopting log-normal distribution. The mechanism of formation of nano powder by wire explosion technique was explained in detail. [Copyright &y& Elsevier]

In the present work, the nano-Al2O3 powder was produced by the wire explosion technique. The shape and size of the particles were measured using Transmission Electron Microscope (TEM) studies. The Scanning Electron Microscope (SEM) studies were carried out to confirm that the particles are of sub-micron size. The compositions of the material were characterized through the Energy Dispersive Angle X-ray Analysis (EDAX) results. The Wide Angle X-ray Diffraction (WAXD) and the Fourier Transform Infra-Red (FTIR) results confirmed the nanosize powder formed by the process as crystalline γ-Al2O3 powder. It is identified that the local temperature of the medium at the time of formation of nanopowder decides the phase characteristics of the powder material. The mechanism of formation of nanopowder by wire explosion technique was explained in detail. [Copyright &y& Elsevier]

Abstract: Tungsten carbide nano particles were formed by carburizing tungsten/tungsten oxide/non-stoichiometric tungsten oxide particles obtained from a wire explosion process with multi walled carbon nano tubes (MWCNT). The produced powder is confirmed to be hexagonal tungsten carbide from wide angle X-ray diffraction analysis. Carburization of tungsten nano particles with MWCNT shows the presence of tungsten sub-carbides in the produced tungsten carbide particles. Transmission electron micrographs show that the tungsten carbide particles are of spherical shape and the geometric mean size of the particles obtained is about 19nm. [Copyright &y& Elsevier]