Abstract
The results of a study on particles’ surfaces after being exposed to the near-electrode region of a radio frequency (RF) discharge are presented. It was experimentally displayed that metal starts being deposited on the surface of particles levitating above the lower electrode of the discharge chamber after switching the RF discharge on. For melamine-formaldehyde (MF) particles, the appearance of an island metal coating is observed after 30 min of plasma exposure. Eroded electrodes and elements of the gas discharge chamber may serve as a source of deposited material. In addition, an analysis of the surface and composition of particles placed on the upper electrode after 6 h of plasma exposure is presented. We reveal that the composition and structure of the particle coating changes during the experiment. The MF particles under exposure become eroded, and needle-like structures containing metals are formed on their surface. We also observe the formation of columnar structures from the products of erosion of electrodes on particles with a metal coating.
Highlights
IntroductionIn the plasma of an radio frequency (RF) discharge, it is possible to form levitating Coulomb systems using micron-sized particles differing in shape and composition, as well as to observe a wide range of effects, resulting from various influences, such as changes in the parameters of a gas discharge [3]
The experiment is performed in the plasma of a capacitive radio frequency (RF) discharge generated between two disk-shaped electrodes within a gas discharge chamber
We have studied the composition and surface structure changes of polymer particles with and without a metal coating during their exposure to two regimes: while levitating in the near-electrode region of an RF discharge, and laying on the upper electrode
Summary
In the plasma of an RF discharge, it is possible to form levitating Coulomb systems using micron-sized particles differing in shape and composition, as well as to observe a wide range of effects, resulting from various influences, such as changes in the parameters of a gas discharge [3]. Under external influences, such systems can exhibit active properties, as well as the ability to self-organize [4]. There is the problem of the formation of melting centers in crystal systems caused by moving particles, the source of which, presumably, are the electrodes
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