Coagulation of dust grains in the plasma of an RF discharge in argon

Mankelevich, Yu. A.; Olevanov, M. A.; Paĺ, A. F.; Рахимова, Т. В.; Ryabinkin, A. N.; Serov, A. O.; Филиппов, А. Н.

doi:10.1134/s1063780x09030027

Cited by 19 publications

(20 citation statements)

References 12 publications

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“…Hence, the dust particle size detected by the AFM and SEM analysis spans a range from ϳ20 nm for single seemingly polyhedrical grains to micron sized agglomerates. This appears compatible with recent dust coagulation models 23,27 that predict that the process of coagulation of larger dust particles ͑clusterlike͒ depends on the dust grains that have grown in the initial gaseous phase. The coagulation phase can occur with enhanced probability, by a process of polarization of the larger particles by the field of the smaller ones, only when the original crystallites effective radius is larger than a certain critical value a ‫ء‬ .…”

Section: Afm and Sem Analysissupporting

confidence: 76%

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Plasma fluctuation spectra as a diagnostic tool for submicron dust

et al. 2010

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It is shown that the measurements of density fluctuation spectra in dusty plasmas can constitute a basis for in situ diagnostic of invisible submicron dust. The self-consistent kinetic theory that includes the charging processes and the natural density fluctuations of the dust particles predicts modifications of the spectra due to the presence of dust. A laboratory experiment was carried out where submicron dust was produced in a gas phase and diagnosed by surface analysis of samples and by measurements of its influence on the plasma density fluctuation spectra. Quantitative comparison of the latter with the theory yields information on dust density, size, and distribution in agreement with the results of the surface analysis. The method can be applied to various plasma environments in laboratory and space.

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Section: Afm and Sem Analysissupporting

confidence: 76%

“…Such development is consistent with growth of dust particle in the discharge; it is expected that dust grains reach maximum size and number density after a certain time. 10,23 It is worth commenting on the difference between the present results and those previously published in Ref. 20.…”

Section: Spectral Measurementscontrasting

confidence: 59%

Plasma fluctuation spectra as a diagnostic tool for submicron dust

et al. 2010

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“…The particle size for the present experiment was chosen on the basis of the following considerations. First, as found in [57], compact particles larger than 16 µm at a mean bulk density of the material of 2 g/cm 3 and higher, are not retained for a long time in a dusty plasma trap, while heavy threadlike agglomerates are retained in a strong electric field at the very bottom of the trap.…”

Section: Dusty Plasma Deposition Of Coatings On Particlesmentioning

confidence: 99%

“…Particle Cloud Parameters in an RF Plasma Trap [54][55][56][57][58][59][60][61] In [60] we performed an experimental study of the effect of a dc magnetron discharge on the parameters of the dust cloud formed in RF plasma. The RF discharge was maintained in a metal reactor chamber mounted inside a vacuum chamber.…”

Section: Dusty Plasma Deposition Of Coatings On Particlesmentioning

confidence: 99%

Application of dusty plasma for production of disperse composite materials

et al. 2015

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Objectives and achievements of the production of disperse composite materials (DCMs) which consist of particles with a metal coating are represented. The prospects of the DCM production by the dusty plasma method based on confining a cloud of micron-sized particles in a discharge plasma and on magnetron sputtering are shown. The method was tested in the preparation of catalyst materials, a superhard diamond polycrystalline material, and a polyquasicrystalline material with a low friction coefficient. The results of investigations of the structure and properties of powdered and sintered DCMs are presented.

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“…One can cite the PIFA ("Particle Ion Flux Asymmetry") coagulation model. 4,5 In this model, the attractive force between particles comes from the asymmetric ion flux resulting from the mutual polarization of the particles. An other model based on the "shadowing force" was proposed to explain such agglomeration events.…”

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confidence: 99%

Agglomeration processes sustained by dust density waves in Ar/C2H2 plasma: From C2H2 injection to the formation of an organized structure

Dap¹,

Hugon²,

Lacroix³

et al. 2013

Physics of Plasmas

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International audienceIn this paper, an experimental investigation of dust particle agglomeration in a capacitively coupled RF discharge is reported. Carbonaceous particles are produced in an argon plasma using acetylene. As soon as the particle density becomes sufficient, dust density waves (DDWs) are spontaneously excited within the cathode sheath. Recently, it was proven that DDWs can significantly enhance the agglomeration rate between particles by transferring them a significant kinetic energy. Thus, it helps them to overcome Coulomb repulsion. The influence of this mechanism is studied from acetylene injection to the formation of very large agglomerates forming an organized structure after a few dozens of seconds. For this purpose, three diagnostic tools are used: extinction measurements to probe nanometer-sized particles, fast imaging for large agglomerates and a dust extraction technique developed for ex-situ analysis. [http://dx.doi.org/10.1063/1.4796047

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Coagulation of dust grains in the plasma of an RF discharge in argon

Cited by 19 publications

References 12 publications

Plasma fluctuation spectra as a diagnostic tool for submicron dust

Plasma fluctuation spectra as a diagnostic tool for submicron dust

Application of dusty plasma for production of disperse composite materials

Agglomeration processes sustained by dust density waves in Ar/C2H2 plasma: From C2H2 injection to the formation of an organized structure

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