M. K. Dosbolayev

Structural Properties of Buffer and Complex Plasmas in RF Gas Discharge-Imposed Electrostatic Field

In this paper, the influence of the additional impact of electrostatic field on dusty and buffer plasma parameters is investigated. It is shown that the addition of a light gas to heavy one and the additional impact of a constant field on the radio frequency discharge lead to changes in the spatial characteristics of the buffer plasma and the location of the plasma-dust structure in the interelectrode space.

The method of synthesizing of superhydrophobic surfaces by PECVD

The aim of this work was to obtain superhydrophobic surfaces in a plasma medium. The experiment was carried out using the PECVD method in two different modes: constant and pulsing. The surface roughness was obtained by applying nanoparticles synthesized in plasma in a mixture of argon and methane. The resulting particles were deposited on the surface of silicon and glass materials. The contact angle increased linearly depending on the number of cycles, until it reached 160° at 150-160th cycles, after that the increase in cycles does not affect the contact angle, since the saturation process is in progress. Also the effect of the working gas composition on the hydrophobicity of the surface was studied. At low concentrations of methane (1%) only particles are synthesized in the working gas, and hydrophobicity is unstable, with an increase in methane concentration (7%) nanofilms are synthesized from nanoclusters, and surface hydrophobicity is relatively stable. In addition, a pulsing plasma mode was used to obtain superhydrophobic surfaces. The hydrophobicity of the sample showed that the strength of the nanofilm was stable in comparison with the sample obtained in the first mode, but the contact angle was lower. The obtained samples were examined using SEM, SPM, optical analysis, and their contact angles were determined.

Synthesis of Microparticles With Narrow Size Distribution in the Plasma of Arc and Radio-Frequency Discharges

Today, the technologies used to produce monodisperse microparticles are very expensive. Due to the wide application of monodisperse/small-dispersed microparticles in various areas of industries, their high cost, and in order to contribute to the decrease in their prime cost, we have developed a new method of production of the small-dispersed/monodisperse microparticles in the plasma of the combined radio-frequency (RF) and (dc/ac) arc discharges. The advantage of the proposed method is the production of the small-dispersed/monodisperse microparticles in the range of 1-50 μm. The dispersivity and the average size (diameter) of the small-dispersed microparticles are easily controlled by varying the parameters of the RF discharge.

Dynamical Properties And Interaction Models Of Dusty Particles In Complex Plasma

A new method for determination of macroparticle charge in dc glow discharge plasma is described. The inverse problem of the estimation of the particles charge on the basis of its videotaped trajectory around the electric probe was solved. The effective interaction potentials in a complex dusty plasma are discussed.

The Motion Of Dust Particles Near Electric Probe

In the present work the dynamics of dust particles near electric probe in discharge at different pressures was studied. Trajectories of dust particles near electric probe with taking into account of the ion drag force and neutral friction force were calculated numerically.

Velocity Autocorrelation Functions and Diffusion of Dusty Plasma

The velocity autocorrelation functions and square displacements were calculated on the basis of experimental data obtained on experimental setup with dc discharge. Computer simulation of the system of dust particles by the method of the Langevin dynamics was performed. The comparisons of experimental and theoretical results are given.

Dusty Plasma in He‐Ar Glow Discharge

The paper reports on the first experiments with plasma‐dust formations in dc gas discharge plasma for He‐Ar mixture. It is shown that under the conventional conditions of the experiments with dusty structures in plasma, the choice of light and heavy gases for the mixture suppresses electron heating in electric field and results in a supersonic jet with high Mach numbers. Distribution functions for drifting ions in the gas mixture are calculated for various mixture concentrations, electric field strengths and gas pressures.

Effective Semi‐empirical Interaction Potential for Dusty Particles

The Poisson equation was numerically solved on the basis of the experimental correlation functions of dusty particles. Calculations were performed with real parameters of dusty plasma. Reconstructed potential has oscillated character; the minimums coincide to maximums of correlation functions.