Dust particle charging in a stratified glow discharge considering nonlocal electron kinetics

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.

Section: Resultsmentioning

confidence: 97%

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

Karasev

Дзлиева

Pavlov

et al. 2019

“…Under experimental conditions, P‐type strata with length L p = 2.08 cm was formed . The value of the average field was E 0 = 4.25 V/cm.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…The experimental conditions were chosen in ref. []. The dust particle was placed in the potential trap created by standing striation.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

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The vibrational properties of the dust trap created in standing striation

Kartasheva

Karasev

2019

The forced vertical oscillations of a single dust particle trapped in a standing striation are investigated. The particle oscillations associated with the displacement of the striation are induced by square wave modulation of discharge current. Amplitude frequency characteristics depending on the shapes of modulating signal are measured at pressure p = 0.16 torr. The resonance frequency, the eigenfrequency, the damping constant, and the amplitude of the resonance peak are determined. The quantitative description of the resonance behaviour of the dust particle is based on the theory of the forced harmonic oscillator. The Q‐factor of a dusty plasma system is measured for the first time. The Q‐factor takes the value of the order of several units, which indicates the large energy dissipation in the dusty plasma systems.

“…The parameters k n and k T should be close to 0.5 , [38] we take the values k n = k T = 0.4 used in. [34] For the electric field E z, we also use a simple analytical model presented in [39] (some details see in [34] )…”

Section: Formation Of Dust Rings At Different Discharge Currentsmentioning

confidence: 99%

Ring dust structures in a weak inhomogeneous magnetic field

Kodanova

Abdirakhmanov

D’yachkov

et al. 2022

Experimental results on the influence of an external inhomogeneous magnetic field created in the end areas of the coil on the dynamics of a ring‐shaped dust structure in a stratified glow discharge in argon are presented. The rotational behaviour of the ring was investigated at different magnetic fields in the range up to 16 mT. It was found that the direction of rotational motion of dust particles in an inhomogeneous magnetic field depends on the direction of its radial component. A theoretical model was proposed to explain the experimental observations.