An experimental study of the degradation of particles in complex plasma

Ermolenko, M. A.; Дзлиева, Е. С.; Karasev, V. Yu.; Pavlov, S. I.; Polishchuk, V. A.; Gorbenko, A. P.

doi:10.1134/s1063785015120196

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…In the profile of particles after exposure to the plasma, the dispersion increases with plasma processing time up to 100 nm (Figure b–d). Observations on the used particle surface modification for the diameter 11.6 µm are well consistent with what is known for 7.3‐µm particles . For example, in Ref.…”

Section: Resultssupporting

confidence: 81%

“…The diameter variation dynamics obtained here may be qualitatively compared to those for particles with 7.3 µm diameter . Also, we noticed a non‐linearity of the size decrease, whose rate considerably increased after 10 min of exposure.…”

Section: Resultssupporting

confidence: 53%

“…In a series of recent studies, we detected the variation in size and surface structure of MF particles in a glow discharge. An accurate measurement of mentioned effect was carried out for particles of 7.3 µm diameter.…”

Section: Introductionmentioning

confidence: 99%

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Surface modification of melamine formaldehyde resin particles in a stratified glow discharge in neon

Karasev

Дзлиева

Pavlov

et al. 2019

Contributions to Plasma Physics

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The paper presents the description of the change in size and structure with time of the surface of polymer particles of melamine formaldehyde injected as a dust component of a complex plasma formed in a stratified glow discharge in neon. The experiment was carried out in a specialized discharge chamber, equipped with a device for collecting particles from a dust trap. The analysis of the size and surface structure was carried out by scanning electron microscopy, which gives the original and the resulting surface views of the plasma‐processed particles. These profiles show the variation in surface roughness distribution under the action of the plasma. The time dependence of the particle diameter on plasma exposure was tracked. Data show that 25 min of exposure results in the dust particles losing a substantial part of their volume, which is accompanied by a decrease of the diameter by half. Our results coincide with previous data for smaller particles in similar plasma conditions.The particles used in this work are larger but still are able to levitate in a dust trap, and corresponding processes of size degradation and surface modification are extremely intense.

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Section: Resultssupporting

confidence: 81%

Section: Resultssupporting

confidence: 53%

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Surface modification of melamine formaldehyde resin particles in a stratified glow discharge in neon

Karasev

Дзлиева

Pavlov

et al. 2019

Contributions to Plasma Physics

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“…20 To estimate the surface temperature, we assume that all ions hitting the dust grain undergo surface recombination and transfer 15.7 eV energy to the surface. The ion flux to the surface is found to be 5.6 Â 10 12 ion/s resulting in a heating power of 14.2 lW.…”

Section: à3mentioning

confidence: 99%

Simple experiment on the sputtering rate of solids in gas discharges

et al. 2017

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We present a very simple and sensitive method to measure the sputtering rate of solid materials in stationary low-pressure gas discharges. The method is based on the balance of the centrifugal force and the confinement electric force acting on a single electrically charged dust particle in a rotating environment. We demonstrate the use and sensitivity of this method in a capacitively coupled radio frequency argon discharge. We were able to detect a reduction of 10 nm in the diameter of a single dust particle. Published by AIP Publishing. [http://dx.doi.org/10.1063/1.4985080] Low-pressure gas discharges in industrial and laboratory applications are mostly confined in a vacuum chamber made of metallic and/or dielectric solid materials. These surfaces define the boundary conditions (temperature, electric potential, etc.) and provide the most significant loss (and sometimes source) channels for the charged particles by electric conduction, surface recombination, electron emission, etc. As gas discharges are driven-dissipative systems, where the charge production processes (ionization and emission) and loss channels (recombination and absorption) are separated in both space and time, the geometrical properties and the boundary conditions have significant effects on the overall plasma parameters such as the distributions of charged species densities, temperature, and electric potential. To date the effect of solid surfaces at the edges of gas discharge plasmas can only be taken into account by applying overly simplified phenomenological models. 1 The data for the different processes in these models, like secondary electron emission yield, electron reflection probability, sputtering yield, etc., are not available in general for any combination of gas and solid materials. In the rare cases where there are experimental data published, the experiments are mostly performed in a high vacuum environment using mono-energetic beams of electrons or ions and clean surfaces.2,3 These conditions are very different from discharge conditions, where the background gas is able to modify the surface.To advance the field of gas discharge physics, a deeper understanding of the mutual interaction between the discharge plasma and the surfaces is needed. Increasingly, effort is being put into research targeting the combined, self-consistent description of the solid-plasma system, the so called "plasma interface" at the microscopic level of individual atoms and electrons including quantum effects. 4 At some stage of these efforts, any new results will have to be validated against actual phenomenological models and experimental data obtained under real discharge conditions. The aim of this study is to provide a simple and fundamental experimental technique for determination of the sputtering rate of solid materials in gas discharges with high accuracy and sensitivity.5 This method can be used to provide experimental data useful for both present phenomenological models and future fundamental models describing sputtering, one of the important p...

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About the mechanism of modification of melamine formaldehyde particles in dusty plasmas

Karasev

Polischuk

Дзлиева

et al. 2020

J. Phys.: Conf. Ser.

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The article presents the previously obtained results of the modification of spherical microparticles of melamine-formaldehyde injected as a dust component of complex plasma formed in stratified glow discharge in neon. Particular attention is paid to changing the particle size depending on the residence time in the plasma. A mechanism is proposed for heating particles by ion flow sustaining a stable charge of their surface. Calculations of the heat balance are presented, confirming the results obtained in the experiment.

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An experimental study of the degradation of particles in complex plasma

Cited by 11 publications

References 6 publications

Surface modification of melamine formaldehyde resin particles in a stratified glow discharge in neon

Surface modification of melamine formaldehyde resin particles in a stratified glow discharge in neon

Simple experiment on the sputtering rate of solids in gas discharges

About the mechanism of modification of melamine formaldehyde particles in dusty plasmas

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