Preparation of Metallic Aluminum Compound Particles by Submerged Arc Discharge Method in Aqueous Media
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HE 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 fields. 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 fields.[3] Commercial production processes for aluminum were first 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 modules.[6] As a catalyst, fine aluminum powder can effectively reduce activation temperature, and thus, it is applied in the production of hightemperature ceramics and in the metallurgical process.[7] CHIH-YU LIAO, Postdoc, is with the Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, R.O.C., and with the Light Source Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, R.O.C. KUO-HSIUNG TSENG, Professor, and HONG-SHIOU LIN, Graduate Student, are with the Department of Electrical Engineering, National Taipei University of Technology. Contact e-mail: [email protected] Manuscript submitted June 4, 2012. Article published online November 8, 2012. METALLURGICAL AND MATERIALS TRANSACTIONS B
As alumina (Al2O3) can withstand high temperatures and has insulation characteristics, it has good corrosion resistance.[8] Previous studies have shown that aluminum nanoparticles can effectively increase the success rate of chemical reaction. For example, the addition of 0.5 pct fine aluminum powder to rocket fuel, as a catalyst, can improve its performance and enhance reaction stability by 10 to 25 pct.[9] Currently, there are many chemical methods for preparing aluminum particles, such as sol-gel chemical,[10,11] vapor phase reaction,[12] hydrothermal,[13] and combustion methods[14]; however, these chemical methods control particle size by adding surfactants. Additionally, thermomechanical[15] and mechanical milling methods[16] are used for temperature control and electricity transmutation when preparing aluminum particles. This study used the spark discharge method,[17] namely, the submerged arc discharge method (SADM), to prepare Al particles in deionized water or ethanol at room temperature and under atmospheric pressure, which has been successfully produced the stable suspension of gold nanofluid[18] and silver nanofluid[19] in previous studies. The process is fast and simple, and it does not require the addition of a chemical agent. The main difference between this study and previous literature reports is the addition of capacitive components between
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