Effect of carrier gas composition on transferred arc metal nanoparticle synthesis
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Metal nanoparticles are used in a great number of applications; an effective and economical production scaling-up is hence desirable. A simple and cost-effective transferred arc process is developed, which produces pure metal (Zn, Cu, and Ag) nanoparticles with high production rates, while allowing fast optimization based on energy efficiency. Different carrier gas compositions, as well as the electrode arrangements and the power input are investigated to improve the production and its efficiency and to understand the arc production behavior. The production rates are determined by a novel process monitoring method, which combines an online microbalance method with a scanning mobility particle sizer for fast production rate and size distribution measurement. Particle characterization is performed via scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction measurements. It is found that the carrier gas composition has the largest impact on the particle production rate and can increase it with orders of magnitude. This appears to be not only a result of the increased heat flux and melt temperature but also of the formation of tiny nitrogen (hydrogen) bubbles in the molten feedstock, which impacts feedstock evaporation significantly in bi-atomic gases. A production rate of sub 200 nm particles from 20 up to 2,500 mg/h has been realized for the different metals. In this production range, specific power consumptions as low as 0.08 kWh/g have been reached.
KeywordsMetal nanoparticles Transferred arc Online characterization Energy efficiency
The research leading to these results has received funding from the European Union’s Seventh Framework Program under grant agreement No. 280765 (BUONAPART-E).
- Boules MI, Jurewicz J, Guo J (2011) Induction plasma synthesis of nanopowders. US patent No. 8013269 B2Google Scholar
- Celik C, Addona T, Boulos MI, Chen G, Davis HJ (2002) Method and transferred arc plasma system for production of fine and ultrafine powders. United States Patent No. 6379419 B1Google Scholar
- Etemadi K, Pfender E (1985) Impact of anode evaporation on the anode region of a high-intensity argon arc. Plasma Chem Plasma Process 5(2):175–182Google Scholar
- Feldheim DL, Foss CA (2001) Metal nanoparticles: synthesis, characterization, and applications. Decker, New York CityGoogle Scholar
- Griem HR (1964) Plasma spectroscopy. McGraw-Hill, New YorkGoogle Scholar
- Honig RE, Kramer DA (1969) Vapor pressure data for the solid and liquid elements. RCA Rev 30:285–305Google Scholar
- Mahoney W, Andres RP (1995) Aerosol synthesis of nanoscale clusters using atmospheric arc evaporation. Mater Sci Eng A204:160–164Google Scholar
- Shin MG, Park WD (2010) Synthesis of copper nanopowders by transferred arc and non-transferred arc plasma systems. J Optoelectron Adv Mater 12(3):528–534Google Scholar
- Uda M, Ohno S, Hoshi T (1983) Process for production fine metal particles. United States Patent No. 4376740Google Scholar