Modification of the texture of a polymer material surface in dust plasma

Karasev, V. Yu.; Дзлиева, Е. С.; Gorbenko, A. P.; Mashek, I. Ch.; Polishchuk, V. A.; Mironova, I. I.

doi:10.1134/s1063784217030094

Cited by 13 publications

(9 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%

“…For example, in Ref. , while exposing to the plasma for 20 min, the surface roughness heights evolved from 15 to 60 nm.…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…For example, in Ref. , while exposing to the plasma for 20 min, the surface roughness heights evolved from 15 to 60 nm.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…450 K because this is the temperature of evaporation. Some degradation of particles during the experiments was in fact revealed [38]. Thus, high T d is solely of the kinetic nature, so we can use the term "anomalous kinetic heating."…”

Section: Resultsmentioning

confidence: 99%

Dust coupling parameter of radio-frequency-discharge complex plasma under microgravity conditions

et al. 2017

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Oscillation of particles in a dust crystal formed in a low-pressure radio-frequency gas discharge under microgravity conditions is studied. Analysis of experimental data obtained in our previous study shows that the oscillations are highly isotropic and nearly homogeneous in the bulk of a dust crystal; oscillations of the neighboring particles are significantly correlated. We demonstrate that the standard deviation of the particle radius vector along with the local particle number density fully define the coupling parameter of the particle subsystem. The latter proves to be of the order of 100, which is two orders of magnitude lower than the coupling parameter estimated for the Brownian diffusion of particles with the gas temperature. This means significant kinetic overheating of particles under stationary conditions. A theoretical interpretation of the large amplitude of oscillation implies the increase of particle charge fluctuations in the dust crystal. The theoretical estimates are based on the ionization equation of state for the complex plasma and the equation for the plasma perturbation evolution. They are shown to match the results of experimental data processing. Estimated order of magnitude of the coupling parameter accounts for the existence of the solid-liquid phase transition observed for similar systems in experiments.

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On the optical measurement of microparticle charge using quantum dots

Pustylnik¹,

Marvi²,

Beckers³

2021

J. Phys. D: Appl. Phys.

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We investigated the possibility of using a layer of quantum dots (QDs) deposited on the microparticle surface for the measurement of the charge the microparticle acquires when immersed into a plasma. To that end, we performed the calculations of the Stark shift of the photoluminescence spectrum of QDs caused by the fluctuating local electric field. In our calculations, we assumed the plasma-delivered surplus electrons to be distributed on the surface of a microparticle. According to our calculations, the Stark shift will acquire measurable values when the lifetime of the quasi-stationary configuration of the surplus electrons will be determined by their diffusion along the surface. Experiments with flat QD-covered floating plasma-facing surfaces suggest that measurable Stark shift of the photoluminescence spectrum can be achieved. Based on our model, modern microscopic plasma-surface interaction theories and analysis of the experiments, we suggest the possible design of the charge microsensor, which will allow to measure the charge accumulated on its surface by means of visible-light optics.

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Modification of the texture of a polymer material surface in dust plasma

Cited by 13 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

Dust coupling parameter of radio-frequency-discharge complex plasma under microgravity conditions

On the optical measurement of microparticle charge using quantum dots

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