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Preparation of Metallic Aluminum Compound Particles by Submerged Arc Discharge Method in Aqueous Media
CHIH-YU LIAO, KUO-HSIUNG TSENG, and HONG-SHIOU LIN
Fine metal particles are produced by chemical methods, which add surfactants to control particle size and concentration. This study used the submerged arc discharge method (SADM) to prepare metal uid containing nanoparticles and submicron particles in pure dielectric uid (deionized water or alcohol). The process is fast and simple, and it does not require the addition of chemical agents. The SADM uses electrical discharge machining (EDM) equipment, and the key parameters of the production process include discharge voltage, current, and pulse discharge on-o duration. This study added a capacitive component between the electrodes and the electrode Z-axis regulation in the control parameters to render the aluminum uid process smooth, which is the main dierence of this article from the literature. The experimental results showed that SADM can produce aluminum particles from nanometer to submicron grade, and it can obtain dierent compounds from dierent dielectric uids. The dielectric uids used in this study were deionized water and ethanol, and aluminum hydroxide Al(OH)3 particles with suspending power and precipitated aluminum particles were obtained, respectively. The preparations of metal colloid and particles by the SADM process have the characteristics of low cost, high eciency, high speed, and mass production. Thus, the process has high research value and developmental opportunities.
DOI: 10.1007/s11663-012-9764-x The Minerals, Metals & Materials Society and ASM International 2012
I. INTRODUCTION
THE aluminum element is a metal commonly used in daily life, is ranked as the third richest content in the earth crust, and has been widely applied in many elds. Aluminum nanoparticles can used for the label-free detection of biomolecules, and its radiated power enhancement is strongly dependent on nanoparticle size.[1] Regarding biochemicals, aluminum is a good antacid[2] and has been widely applied in industrial elds.[3] Commercial production processes for aluminum were rst proposed by Austrian chemist Karl Joseph Bayer in 1888.[4] With the advancement of nanometer science and technology, aluminum particles have increasingly broader applications in electromechanical and chemical engineering.[5] For example, a conducting solution made from aluminum has the spectral region of 200 to 500 nm in spectral analysis, and thus, it can be applied in semiconductor processes, which contributes to semiconductor...