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Publié le 4 septembre 2012
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Colloque / Séminaire 7 décembre 2018
10h30
Salle Paul Janet 5-A-002(a)
G2Elab
site GreEn-ER
21 avenue des Martyrs
38000 Grenoble

Accès Tram B, arrêt CEA-Cambridge
ou Bus Transisère, arrêt CEA-Cambridge (Express 1 et 2)

Temperated micro-plasmas for environmental purposes sources, properties, diagnostics & challenges

Room temperature atmospheric pressure plasmas have gained a significant interest over the last decade mainly due to their unique properties to support green processes. For instance, it has already been demonstrated that non-thermal plasmas have the ability to sterilize heat sensitive materials (including biological tissues), to activate water solutions and to trigger beneficial biological mechanisms to heal chronic wounds. . . Non-thermal plasmas are highly energetic –partially– ionized gases governed by the generation of a non-equilibrium plasma chemistry leading to the production of charged particles, reactive species, (V)UV radiation and an intense transient electric field. Micro-plasma devices can use different types of electric excitation to ignite the discharge. Among them, ionization waves are often the main governing mechanisms while minimizing gas heating. Several types of microplasmas will be introduced and their intrinsic properties discussed regarding the general context of environmental applications. To get a better insight on fundamental mechanisms, plasma diagnostic techniques are required. In this respect, passive and active spectroscopic techniques will be reviewed and used as a red line to report on:
• Plasma electric field characterization,
• Highly reactive species production (OH, NO, NO2, O3),
• Discharge propagation mechanism from ionization wave to streamers,
• Neutral gas flow modification,
• Neutral gas temperature.
Last but not least, recent advances and challenges on silicon-based micro-hollow cathode discharge operated in DC will be presented as an alternative to ionization wave plasmas operating at atmospheric pressure.
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Rédigé par Marie Therese Loubinoux

mise à jour le 5 décembre 2018

Univ. Grenoble Alpes