Experimental data on the active Brownian motion of single particles in RF (radio-frequency) discharge plasma under influence thermophoretic force, induced by laser radiation, depending material and type surface particle, are presented. Unlike passive particles, also known as micro-swimmers, move directionally. It was shown that different dust gas can convert energy a surrounding medium (laser radiation) into kinetic motion. The movement particle is superposition chaotic self-propulsion.

The influence of laser-induced active Brownian motion on dust-acoustic instability in the colloidal plasma a direct current glow discharge was experimentally studied. dust structure formed by spherical monodisperse melamine-formaldehyde particles with partial copper coating (Janus particles). It is shown that increasing laser radiation intensity, self-excited plane wave decays. At an intensity ≈1.5 W/cm2, ceases to be observed three-dimensional plasma–dust cloud. As decreases, excited again,...

Abstract A multimodal dusty plasma formed in a positive column of the direct current glow discharge at superfluid helium temperatures has been studied for first time. Formation liquid-like structure occurred after injection polydisperse cerium oxide particles discharge. The coupling parameter ~10 determined corresponds very well to its type. cloud nanoparticles and non-linear waves within were observed T < 2 K. Solid helical filaments with length up 5 mm, diameter 22 μm, total charges 6...

The results of a study on particles' surfaces after being exposed to the near-electrode region radio frequency (RF) discharge are presented. It was experimentally displayed that metal starts deposited surface particles levitating above lower electrode chamber switching RF on. For melamine-formaldehyde (MF) particles, appearance an island coating is observed 30 min plasma exposure. Eroded electrodes and elements gas may serve as source material. In addition, analysis composition placed upper...

This work presented the results of an experimental study dynamics emulsion complex composition droplets under laser irradiation. The oil-in-water consisted liquid paraffin containing magnetite nanoparticles and was placed in aqueous solution surfactant. had characteristic dimensions 10−8 m, which correspond to molecular motors living cells. For all droplets, motion transitional normal diffusive modes observed. effective kinetic temperature 3.5 × 103 eV exceeded thermal medium molecules, 0.03...

Stability of a vertically aligned microparticle pair in stratified glow DC discharge is experimentally investigated. Using laser perturbations, it shown that, for the same parameters, microparticles can be suspended two stable configurations: vertical and horizontal. The interparticle interaction electric field stratum region particle levitation are quantitatively investigated first time. decharging effect lower (downstream) by ion flow wake also observed time discharge. obtained...

We analyze the experimental data on motion of active Brownian micrograins in RF discharge plasmas. In experiments, two types microparticles were used: first-plastic grains fully covered with metal, and second-Janus particles a thin metal cap. have tracked trajectories separate plotted pair correlation functions observed structures. To examine grains, we studied dependencies MFPT dynamic entropy coarsening parameter, fractal dimension system its mean kinetic temperature, localization area...

The present article considers the phenomena observed in ultracold multimodal dusty plasma generated glow discharge cooled with superfluid helium. It was shown that intense sputtering of clay insert due to focused beams low energy electrons and ions produces a total flow ∼100 ng s−1 sputtered materials at power released less than 0.1 W T ⩽ 2 K. synthesis rates for nanoclusters (∼10 s−1) filaments (∼1 were estimated first time. Fast growth quasy one-dimensional structures, high aspect ratio,...

We present the experimental results of our study formation and dynamics chain structures by active Brownian particles in a DC glow discharge. The mechanism particle motion is associated with conversion laser radiation into energy their own (nonthermal) motion. Through analysis parameters (the trajectories, root-mean-square displacement, kinetic energy) as function intensity incident on particles, we have shown that are ones. It possible to control without changing discharge parameters. has...

Abstract The results of the analysis mean square displacement and trajectories moving polymer particles with a modified surface in dusty plasma monolayer under influence laser radiation are presented. It has been revealed that dynamics particle motion consists three modes: finite within confinement, Brownian motion, combined directional chaotic motion. linear along across direction dust at various values power presented too. shown experimentally active their activity grows increasing power.

Abstract We present the results of analysis trajectories, dynamic entropy, and root-mean-square displacement moving copper particles in a cluster chain structures when exposed to laser radiation. have revealed that dynamics particle motion corresponds three modes: localized area, Brownian motion, combined directional chaotic motion. The linear along across direction dust at various values radiation power are presented. It has been shown experimentally active their activity grows with...