Preparation of Aluminium Nanoparticles by Pulsed Wire Discharge and its Particle Size Control

摘要

Aluminium is the lightest metal with a very low specific weight and has many applications. Among them, aluminium nanoparticles are catalysts for promoting chemical reactions. However, it was difficult to prepare aluminium nanoparticicles because of the large surface area and the rapid oxidation in air. Various passivated metal nanoparticles of including magnesium1 and titanium2 were prepared by pulsed wire discharge(PWD). In this study, this method was chosen for the preparation of aluminium nanoparticles.Aluminium wires with 0.30mm in diameter and 25mm in length were used. Then one of the wires were connected to capacitors of 30F charged at 3.5kV, 4.5KV and 6.0kV in Ar gas at 10kPa, 50kPa and 100kPa. The phases in the powder were analysed by using x-ray diffraction. The morphology of the particles were studied by using a transmission electron microscope(TEM).