Particle charging in low-pressure plasmas

Matsoukas, Themis; Russell, Marc

doi:10.1063/1.359451

Cited by 207 publications

(179 citation statements)

References 16 publications

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“…Assuming that the number of charges on a dust grain has a Poisson distribution, to a reasonable approximation, with Q 0 representing the average value, we will have the standard deviation of the charges to be ∼ √ Q 0 . This implies that the relative magnitude of charge fluctuations is ∼1/ √ Q 0 , which is a small quantity (Matsoukas and Russell, 1995). We can usually ignore the statistical variations in the number of elementary charges on dust grains when their scale sizes are larger than the Debye length.…”

Section: Figmentioning

confidence: 99%

Numerical simulations of the charging of dust particles by contact with hot plasmas

Miloch

Pécseli

Trulsen

2007

Nonlin. Processes Geophys.

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Abstract.Charging of individual dust particles in contact with hot plasmas is studied by numerical methods. The dust particle is treated as a rigid solid body, composed by either perfectly insulating or conducting material. The collisionless plasma, consisting of electrons and singly charged ions, is simulated by Particle-in-Cell methods in two spatial dimensions. It is demonstrated that the surface conditions, i.e. roughness, of the dust particles are significant for the charging. In a streaming plasma, a dust grain develops an electric dipole moment which varies systematically with the relative plasma flow. The strength and direction of this dipole moment depends critically on the material. We observe also Langmuir oscillations excited in the vicinity of the particles, and analyze the spatial variation of their spectral distribution.

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Section: Figmentioning

confidence: 99%

Numerical simulations of the charging of dust particles by contact with hot plasmas

Miloch

Pécseli

Trulsen

2007

Nonlin. Processes Geophys.

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“…It is possible to use a charge of the microparticles that depends on the position -however, in the simulations presented in this paper, all microparticles carry the same charge. Typically, we estimate the average microparticle charge q with Matsoukas and Russel [84]'s approximation…”

Section: Molecular Dynamics Model Of the Microparticlesmentioning

confidence: 99%

Simulating the dynamics of complex plasmas

Schwabe

Graves

2013

Phys. Rev. E

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Complex plasmas are low temperature plasmas that contain micrometer-sized particles in addition to the neutral gas particles and the ions and electrons that make up the plasma. The microparticles interact strongly and display a wealth of collective effects. Here, we report on linked numerical simulations that reproduce many of the experimental results of complex plasmas. We model a capacitively coupled plasma with a fluid code written for the commercial package COMSOL. The output of this model is used to calculate forces on microparticles. The microparticles are modeled using the molecular dynamics package LAMMPS, which we extended to include the forces from the plasma. Using this method, we are able to reproduce void formation, the separation of particles of different sizes into layers, lane formation, vortex formation and other effects.

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“…CNPs of few nm have a charge close to unity. This enables stochastic charge fluctuations to briefly produce neutral or even positively charged CNPs [73], leading to higher collision rates. When the CNP density reaches a critical value [24], a rapid agglomeration phase is therefore initiated enhanced by long-range Coulomb interactions which leads to relative big particles and a decrease of their density.…”

Section: Discussionmentioning

confidence: 99%

Fast nanostructured carbon microparticle synthesis by one-step high-flux plasma processing

Aussems

Bystrov

Doğan

et al. 2017

Carbon

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This study demonstrates a fast one-step synthesis method for nanostructured carbon microparticles on graphite samples using high-flux plasma exposure. These structures are considered as potential candidates for energy applications such as Li-ion batteries and supercapacitors. The samples were exposed to plasmas in the linear plasma generator Pilot-PSI with an average hydrogen ion-flux of ~10 24 m -2 s -1 . The parameter window was mapped by varying the ion energy and flux, and surface temperature. The particle growth depended mainly on the sample gross-erosion and the resulting hydrocarbon concentration in the plasma. A minimum concentration was necessary to initiate particle formation. The surface of the sample was covered with microparticles with an average growth rate of 0.2 μm/s, which is significantly faster than most chemical methods. The particles were initially volumetrically grown in in the gas-phase by a multiphase process and after deposition on the sample their growth proceeded. Scanning and transmission electron microscopy reveal that the core of these microparticles can be made of an

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Particle charging in low-pressure plasmas

Cited by 207 publications

References 16 publications

Numerical simulations of the charging of dust particles by contact with hot plasmas

Numerical simulations of the charging of dust particles by contact with hot plasmas

Simulating the dynamics of complex plasmas

Fast nanostructured carbon microparticle synthesis by one-step high-flux plasma processing

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