Abstract
Experimental data on the active Brownian motion of single particles in the RF (radio-frequency) discharge plasma under the influence of thermophoretic force, induced by laser radiation, depending on the material and type of surface of the particle, are presented. Unlike passive Brownian particles, active Brownian particles, also known as micro-swimmers, move directionally. It was shown that different dust particles in gas discharge plasma can convert the energy of a surrounding medium (laser radiation) into the kinetic energy of motion. The movement of the active particle is a superposition of chaotic motion and self-propulsion.
Highlights
In order to get a basic understanding of the differences between the motion of regular particles and Janus particles, a good approach is to compare the trajectories of single particles of approximately equal radius in the same environment
The diameter of the ring was selected so that dust particles were reliably held by the trap, but at the same time could perform a Brownian motion of large amplitude
The active Brownian motion of single dust particles induced by laser radiation in an electrostatic symmetric trap of an RF discharge is studied experimentally
Summary
The attention of the research community studying particles suspended in liquids has been attracted by the so-called “active” particles. Such particles exhibit a modification of Brownian motion due to the effects of autonomous self-propulsion (for example, in the case of bacteria) or due to the special nature of their shape or surface, which makes their properties anisotropic. The novelty of this work lies in comparing the motion of particles with different surface properties, which are placed in the same plasma medium
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