The influence of spark discharge parameters on nanoparticle formation and their sizes

Abstract : Recently, it has been shown that a parallel system of metal electrodes in spark discharge is an efficient source of aerosols [Tabrizi et al, 2009; Meuller et al, 2012]. To better understand the mechanisms involved in this process, we present calculation results focused at the nanoparticle formation by a single spark event. To analyze the experimental results and to optimize the synthesis procedure, a numerical modelling of the main physical processes taking place during spark discharge is performed. Because of difference in time scales of the phenomena involved in spark discharge it is considered that general model consists of several stages: (i) streamer formation and propagation between electrodes; (ii) streamer-to-spark transition; (iii) gas heating and expansion, (iv) electrode evaporation and erosion; (v) nanoparticles formation due to both nucleation, coalescence and growth. It is shown that surface roughness is an important parameter that determines the major mechanism of electrode material injection in the gas. Gas between electrodes is heated to high temperature that leads to expansion so that electrode material vapour is injected into low-density hot gas area (Figure 1). The influence of plasma column parameters on nanoparticle size distribution and amount is studied. In particular, it is shown that for the well-defined conditions, the radius of critical nuclei can be of order of a single atom radius that causes direct collisional nanoparticle formation [Xiong and Pratsinis, 1991] without nucleation stage. A careful analysis based on the performed modelling allows us to determine the optimal set-up parameters for the production of nanoparticles with the required sizes. Acknowledgements The research leading to these results has received funding from the European Union’s Seventh Framework Programme under Grant Agreement n° 280765 (BUONAPART‐E). References N. S. Tabrizi, M. Ullmann, V. A. Vons, U. Lafont and A. Schmidt-Ott: J. Nanopart. Res. (2009) 11:315–332. Bengt O. Meuller, Maria E. Messing, David L. J. Engberg, Anna M. Jansson, Linda I.M. Johansson, Susanne M. Norlén, Nina Tureson and Knut Deppert: Aerosol Sci. and Tech. (2012) 46:1256–1270. Y. Xiong and S.E. Pratsinis, J. Aerosol Sci. (1991) 22: 637.
Type de document :
Poster
2014 International Aerosol Conference, IAC 2014, Aug 2014, Busan, South Korea. 2014, 〈www.iac2014.net〉
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Contributeur : Tatiana Itina <>
Soumis le : vendredi 24 octobre 2014 - 17:30:32
Dernière modification le : jeudi 11 janvier 2018 - 06:20:35

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  • HAL Id : ujm-01077473, version 1

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A. Voloshko, Jean-Philippe Colombier, Tatiana Itina. The influence of spark discharge parameters on nanoparticle formation and their sizes. 2014 International Aerosol Conference, IAC 2014, Aug 2014, Busan, South Korea. 2014, 〈www.iac2014.net〉. 〈ujm-01077473〉

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