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Poster De Conférence Année : 2015

Nanoparticle formation from material sputtering and liquid precursors

Résumé

Dust particles can be produced in low-pressure plasmas using different methods. The most well-known technique consists in injecting a reactive gas in addition to the buffer gas. Volume reactions create the molecular precursors at the origin of nanoparticle nucleation and growth. The precursors can also be injected in the gas phase by material sputtering. A material exposed to the plasma will be sputtered by plasma ions and will release molecular precursors. Another possibility is to use a liquid precursor and to evaporate it for injection in the plasma. In the first part of this presentation, we will present some surprising phenomena observed in a dusty plasma produced by material sputtering. Particularly, the appearance of a wide variety of instabilities will be characterized. One type of instability is relatively original as it appears as bright plasma spots (plasmoids) moving rapidly in the plasma. High-speed imaging provides very interesting results concerning their behavior and interactions. Indeed, plasmoids interact with each other and phenomena like splitting or merging are observed. The second aspect will concern the nanoparticle growth from a liquid precursor. This work has just started recently and very preliminary results will be presented. It concerns the growth of soot analogs in a plasma. The general context of this study is the formation of soot particles in the road transportation sector where biofuels are more and more used. The objective of this collaborative project is to form soot analogs in well-controlled conditions in order to study precisely their formation, composition and structure. This understanding will help to develop methods for minimizing their production and noxious effects.
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Dates et versions

hal-01258511 , version 1 (19-01-2016)

Identifiants

  • HAL Id : hal-01258511 , version 1

Citer

Safa Labidi, Hagop Tawidian, Thomas Lecas, Titaina Gibert, Maxime Mikikian. Nanoparticle formation from material sputtering and liquid precursors. 20th International Colloquium on Plasma Processes (CIP 2015), Jun 2015, Saint-Etienne, France. ⟨hal-01258511⟩
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