Charge électrique résiduelle sur des poudres à l'extinction d'un plasma poussiéreux

Couëdel, Lénaïc; Mezeghrane, Abdelaziz; Mikikian, Maxime; Tessier, Yves; Samarian, A. A.; Cuthbert, C.; Boufendi, Laïfa

doi:10.1016/j.elstat.2007.06.008

Cited by 3 publications

(1 citation statement)

References 37 publications

(56 reference statements)

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“…In our experimental conditions, oscillations with amplitudes around 1 mm can be obtained. More surprising, the oscillation phase shows that this charge can be either negative or positive [52][53][54][55][56]. By analyzing statistically the value of this charge on many dust particles, the residual charge distribution appears to be highly dependent on the complex diffusion processes of electrons and ions during the afterglow period [53,55].…”

Section: Behavior Of Dust Particles Once the Plasma Is Switched Offmentioning

confidence: 99%

Dusty plasmas: synthesis, structure and dynamics of a dust cloud in a plasma

Mikikian

Couëdel

Cavarroc

et al. 2009

Eur. Phys. J. Appl. Phys.

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Plasmas are energetic media that can give birth to dust particles due to the presence of reactive gases or plasma-surface interactions. Industrial plasmas are often concerned by these dust particles that can be either unwanted or useful for the process. For fusion plasmas, production of dust particles from wall erosion is a serious issue for performance and safety reasons. In this article, some aspects of dusty plasmas with potential implications for plasma experimenters will be discussed. Convenient ways for detecting the presence or the growth of dust particles will be presented. The spatial distribution of the dust cloud during the plasma phase determines the subsequent dust particle deposition. It will be shown that some reactor regions can attract or repeal these dust particles. Finally, the dust particle dynamics after the plasma extinction will be investigated. A special attention will be paid on the residual electric charge that can stay attached on the dust particle surface and on its implications for dust particle control or deposition.

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Section: Behavior Of Dust Particles Once the Plasma Is Switched Offmentioning

confidence: 99%

Dusty plasmas: synthesis, structure and dynamics of a dust cloud in a plasma

Mikikian

Couëdel

Cavarroc

et al. 2009

Eur. Phys. J. Appl. Phys.

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Nanoparticles synthesis in microwave plasmas: peculiarities and comprehensive insight

Ouaras,

Lombardi,

Hassouni

2024

Sci Rep

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Low-pressure plasma processes are routinely used to grow, functionalize or etch materials, and thanks to some of its unique attributes, plasma has become a major player for some applications such as microelectronics. Plasma processes are however still at a research level when it comes to the synthesis and functionalization of nanoparticles. Yet plasma processes can offer a particularly suitable solution to produce nanoparticles having very peculiar features since they enable to: (i) reach particle with a variety of chemical compositions, (ii) tune the size and density of the particle cloud by acting on the transport dynamics of neutral or charged particles through a convenient setting of the thermal gradients or the electric field topology in the reactor chamber and (iii) manipulate nanoparticles and deposit them directly onto a substrate, or codeposit them along with a continuous film to produce nanocomposites or (iv) use them as a template to produce 1D materials. In this article, we present an experimental investigation of nanoparticles synthesis and dynamics in low-pressure microwave plasmas by combining time-resolved and in-situ laser extinction and scattering diagnostics, QCL absorption spectroscopy, mass spectrometry, optical emission spectroscopy and SEM along with a particle transport model. We showed for the first time the thermophoresis-driven dynamic of particle cloud in electrodless microwave plasmas. We showed that this effect is linked to particular fluctuations in the plasma composition and results in the formation of a void region in the bulk of the plasma surrounded by a particle cloud in the peripherical post-discharge. We also reveals and analyze the kinetics of precursor dissociation and molecular growth that result in the observed nanoparticle nucleation.

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Effect of nanoparticles on an rf discharge afterglow

Schweigert¹,

Alexandrov²

2012

J. Phys. D: Appl. Phys.

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The influence of nanoparticles on a discharge plasma afterglow in argon is studied using particle-in-cell Monte Carlo collision simulations. The anomalous electron density increase observed in the experiment (Berndt et al 2006 Plasma Sources Sci. Technol. 15 18) is analysed on the basis of the electron and ion distribution functions. It is shown that the departure of fast electrons to the electrodes in the early afterglow is responsible for the rapid increase in the electron density. When the fast electrons escape from the discharge volume, the balance of the electron and ion currents on the dust surface is disturbed, and the magnitude of the dust floating potential drops. The electrons released from the dust surface contribute to the anomalous growth of the electron density. The additional production of electrons due to metastable–metastable ionization enhances the effect of electron density increase provided by dust discharging.

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Charge électrique résiduelle sur des poudres à l'extinction d'un plasma poussiéreux

Cited by 3 publications

References 37 publications

Dusty plasmas: synthesis, structure and dynamics of a dust cloud in a plasma

Dusty plasmas: synthesis, structure and dynamics of a dust cloud in a plasma

Nanoparticles synthesis in microwave plasmas: peculiarities and comprehensive insight

Effect of nanoparticles on an rf discharge afterglow

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