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2024-11-23 18:15

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Conference: Bucharest University Faculty of Physics 2016 Meeting

Section: Optics, Spectroscopy, Plasma and Lasers

Title:

Production of tungsten particles with various shapes by using controlled atmospheric pressure plasma

Authors:

Valentina MARASCU(1, 2), C. CONSTANTIN(1), Andrada LAZEA-STOYANOVA(2), Anca BONCIU(1), S. Daniel STOICA(2), C. STANCU(2), M. TEODORESCU(2), G. DINESCU(1, 2)

Affiliation:

1) Faculty of Physics, University of Bucharest, 405 Atomistilor, 077125 Bucharest- Magurele, Romania

2) National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Bucharest– Magurele, Romania

E-mail

valentina.marascu@inflpr.ro

Keywords:

metal particles, atmospheric plasma jet, tungsten particles, fusion technology

Abstract:

Metal particles production represents a domain of great interest, from solar cells research domain, drug delivery in medicine, up to fusion research. In this line, we present results regarding the production of tungsten particles with various size and shapes, by using a controlled atmospheric pressure plasma jet. As we know, in the future ITER tokamak, a hot deuterium-helium plasma will be created, that will deliver an enormous quantity of energy. During its lifetime, the plasma-wall interactions will produce tungsten particles, with various shape and sizes, which can incorporate tritium, leading to human and environment hazards. Therefore, the process of synthesis of particles in plasma, and knowledge of their properties is of special interest. The plasma was generated by a radiofrequency discharge in Argon, at 13.56 MHz. The created particles were analyzed using Optical Microscopy, Scanning Electron Microscopy, Atomic Force Microscopy, and the size distribution was obtained by using a handmade program developed in MatLab [1]. The plasma was analyzed via Optical Emission Spectroscopy technique, and tungsten lines were identified. We conclude that the tungsten emission lines observed in the plasma discharge are originating from the discharge electrodes, and the electrodes material removed was vaporized from the source, obtaining particles with sizes from 100 nm up to several microns with spherical, cubic, or popcorn shapes.

References:

[1] V. Mărăscu, I. Chițescu, V. Barna, M. D. Ioniță, A. Lazea-Stoyanova, B. Mitu, G. Dinescu, Application of image recognition algorithms for statistical description of nano- and microstructured surfaces, AIP Conf. Proc. 1722, 290006 (2016); http://dx.doi.org/10.1063/1.4944292

Acknowledgement:

V. Mărăscu acknowledge the support in the frame of the project 1-EU12 WPEDU-RO, "EUROfusion Consortium contribution to education in fusion research at the predoctoral and PhD level", Joint Research Unit - Institute for Atomic Physics, Romania.