Pulsed wire discharge (PWD) is one of the many nanoparticle preparation methods known for its high efficiency and high production rate. Particle size is controlled by gas pressure and input energy. However, the effect of ambient gas species on particle size is not well known. In this study, single-phase palladium (Pd) nanoparticles were prepared in N2, Ar, and He ambient gasses by PWD. The mean diameter of the prepared particles in Ar was smaller than those of the other nanoparticles because of the low ionization energy required to form an alternate current path and the partial wire evaporation. A novel equation for estimating the average grain size was proposed. By comparing the estimated and measured mean diameters, the validity of the equation was shown. © 2015 The Japan Society of Applied Physics.

Ramanujam Sarathi

Department of Electrical Engineering

Grain size and shape

Ionization of gases

Nanoparticles

Wire

Alternate currents

Average grain size

DETERMINING EQUATION

HIGH PRODUCTION RATE

High-efficiency

NANOPARTICLE PREPARATIONS

Palladium nanoparticles

PULSED WIRE DISCHARGE

particle size

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IIT Madras

Preparation of palladium nanoparticles and a grain-size determining equation of pulsed wire discharge in N2, Ar, and He ambient gasses

Japanese Journal of Applied Physics

Pulsed wire discharge was used to prepare nanoparticles of molybdenum and its carbides from Mo wires in a gas mixture of argon and kerosene at pressures of 100, 50, and 25 kPa. The different pressures affected the carburization process and particle formation. The most effective pressure was 25 kPa, where the volume fraction of MoC was identified by Rietveld refinement of X-ray diffraction data to be 98.4%. The particle size distribution was also obtained from transmission electron microscopy measurements, and the smallest geometric mean diameter was determined tobe 24.3 nm for the sample prepared at 25 kPa. © 2019 The American Ceramic Society

Journal of the American Ceramic Society

Synthesis of molybdenum carbide nanoparticles using pulsed wire discharge in mixed atmosphere of kerosene and argon

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. © 2006 Elsevier Inc. All rights reserved.

Materials Characterization

Generation of nano aluminium powder through wire explosion process and its characterization

Determining factor of median diameter in intermetallic compound nanoparticles prepared by pulsed wire discharge

Rapid Prototyping Journal

Additive manufacturing (AM) and nanotechnology: promises and challenges

Particle Size Determining Equation in Metallic Nanopowder Preparation by Pulsed Wire Discharge

Fine-Pitch Copper Wiring Formed with Super-Inkjet and Oxygen Pump

Journal	Japanese Journal of Applied Physics
Publisher	Japan Society of Applied Physics
ISSN	00214922
Open Access	No