17-08-00731 А

Over the entire period of the project, the following studies were carried out and the following results were obtained.

- The existing experimental setup was modernized for studying a spherical gas discharge and nano- and microparticles formed in it. A stand was prepared for probe, mass spectrometric and optical measurements of plasma. The vacuum chamber was equipped with additional pumping to collect the formed particles on the filter. Particles were collected both from the discharge volume and from the electrodes.

- The obtained material was analyzed using optical and transmission electron microscopes, as a result of which the composition, geometry of particles and particle size distribution functions were determined.

- Mass spectrometric analysis of the change in the composition of the gas mixture from the moment of ignition of the discharge to the moment of establishment of stationary parameters during the combustion of the discharge in high-molecular gases (in ethanol, acetone, ethylene vapors) was carried out.

- Probe measurements of the parameters of a spherical gas discharge with a point anode were carried out.

- The conditions for the appearance of clouds of dust particles, their spatial arrangement and evolution in the volume of the gas discharge were determined.

- A self-consistent one-dimensional radial model of a spherical glow discharge was developed, based on the solution of the nonlocal Boltzmann equation for the electron energy distribution function, the drift-diffusion equation for ions, and the Poisson equation for determining the self-consistent electric field in the discharge tube. The model was used to obtain the radial distributions of the densities of electrons, ions, and dust particles.

- Numerical simulation for dust particles of a given size and shape were determined by the charges of dust particles and the spatial distribution of the potential around the dust particles depending on the electric field and free path in a wide range of discharge parameters.

- Composite core-shell particles of Fe-C were found in a spherical stratified glow discharge. The morphology of such particles was studied. It turned out that these particles have an inner core of iron, surrounded by a shell of crystalline carbon and covered with an outer shell of amorphous carbon.

The research results were presented at three oral and four poster presentations at international conferences 8th International Conference on the Physics of Dusty Plasma, Prague, Czech Republic; 16th International Conference on the Physics of Non-Ideal Plasmas, Saint-Malo, France; 14th International Conference "Gas Discharge Plasmas and Their Applications", Tomsk, Russia.

The following articles have been published in peer-reviewed international journals with reference to the grant:

- Sukhinin G., Salnikov M., Fedoseev A., Rostom A. Plasma Polarization and Wake Formation Behind a Dust Particle in an External Electric Field // IEEE Transactions on Plasma Science. - 2018. - T. 46, № 4. - C. 749-754.

- Fedoseev A. V., Sukhinin G. I., Sakhapov S. Z., Zaikovskii A. V., Novopashin S. A. Elongated dust particles growth in a spherical glow discharge in ethanol // AIP Conference Proceedings. - 2018. - T. 1925, № 1. - C. 020026.

- Sukhinin G. I., Salnikov M. V., Fedoseev A. V. The effect of the type of ion–neutral collisions on ion cloud formation // AIP Conference Proceedings. - 2018. - 2018/01/05. - T. 1925, № 1. - C. 020029.

- Sukhinin G. I., Fedoseev A. V., Salnikov M. V. Effect of ion mean free path length on plasma polarization behind a dust particle in an external electric field // Contributions to Plasma Physics. - 2019. - T. 59, № 4-5. - C. e201800152.

- Sakhapov S. Z., Zaikovskii A. V., Fedoseev A. V., Sukhinin G. I., Novopashin S. A. Core-shell Fe-C nanoparticles synthesis in a spherical striated glow discharge // EPL (Europhysics Letters). - 2019. - T. 125, № 1. - C. 15002.

Sukhinin Gennady Ivanovich (S)

Sahapov Salavat Zinfirovich

Alexander Fedoseev Vladimirovich

Alexey Zaikovsky Vladimirovich

Salnikov Mikhail Vladimirovich

Demin Nikon Alexandrovich