Laser-induced melting of two-dimensional dusty plasma system in RF discharge

Vasilieva, E. V.; Петров, О. Ф.; Vasiliev, M. M.

doi:10.1038/s41598-020-80082-x

Cited by 34 publications

(23 citation statements)

References 48 publications

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“…For example, in theoretical works [13,14], transport processes and phase transitions in a system of spherical polymer particles are described; in experimental research [3], phase transitions in a system of such particles are investigated when the plasma parameters are changed. Another example is shown in [15], where the presence of a metal cover on particles leads to phase transitions in the Coulomb system because of the external action of a laser under the constant parameters of the gas discharge. On the other hand, research [7] shows that a phase transition is also possible in a Coulomb system of uncoated particles as a result of scattering laser radiation by particles under constant plasma parameters.…”

Section: Discussionmentioning

confidence: 99%

Particle Surface Modification in the Near-Electrode Region of an RF Discharge

et al. 2021

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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.

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Section: Discussionmentioning

confidence: 99%

Particle Surface Modification in the Near-Electrode Region of an RF Discharge

et al. 2021

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“…For the system of covered particles, one can distinguish the curves characteristic of the two-dimensional crystals and liquid-like structures. As this structure heats up, it passes through several phase states [ 38 ], which are shown in panel (a): here one can see the PCFs characteristic of the strongly coupled system (W = 0.019 W), the weakly coupled system (W = 0.49 W) and the system with an intermediate degree of correlation (W = 0.18 W).…”

Section: Resultsmentioning

confidence: 99%

Dynamic Entropy of Two-Dimensional Active Brownian Systems in Colloidal Plasmas

et al. 2022

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We analyze the experimental data on the motion of active Brownian micrograins in RF discharge plasmas. In the experiments, two types of microparticles were used: first—plastic grains fully covered with metal, and second—Janus particles with a thin metal cap. We have tracked the trajectories of the separate grains and plotted the pair correlation functions of the observed structures. To examine the motion of the grains, we studied the dependencies of the MFPT dynamic entropy on the coarsening parameter, the fractal dimension of the system on its mean kinetic temperature, and the mean localization area of the grain on its mean kinetic temperature. Based on the obtained results, we conclude that the character of motion of our active Brownian systems changes as the power of an illuminating laser (and, therefore, the mean kinetic temperature of the grains) increases. Janus particles change their trajectories from more chaotic to spiral-like ones; in the case of fully covered particles, we observe the dynamical phase transition from the more ordered structure to the less ordered one.

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“…2(a). The static structure factor [30] also provides a useful signature to distinguish between different lattice arrangements as is discussed in detail in Sec. II of the supplemental material [28].…”

Section: Resultsmentioning

confidence: 99%

Square lattice formation in a monodisperse complex plasma

Sing¹,

Bandyopadhyay²,

Kumar³

et al. 2022

Preprint

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We present the first observations of a square lattice formation in a monodisperse complex plasma system -a configurational transition phenomenon that has long been an experimental challenge in the field. The experiments are conducted in a tabletop L-shaped Dusty Plasma Experimental (DPEx-II) device in a DC glow discharge Argon plasma environment. By a careful control of the vertical potential confining the charged particles as well as the strength of the ion wake charge interactions with the dust particles we are able to steer the system towards a crystalline phase that exhibits a square lattice configuration. The transition occurs when the vertical confinement strength is slightly reduced below a critical value leading to a buckling of the monodisperse hexagonal 2D dust crystal to form a narrowly separated bilayer state (a quasi-2D state). Some theoretical insights into the transition process are provided through Molecular Dynamics (MD) simulations carried out for the parameters relevant to our experiment.

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Laser-induced melting of two-dimensional dusty plasma system in RF discharge

Cited by 34 publications

References 48 publications

Particle Surface Modification in the Near-Electrode Region of an RF Discharge

Particle Surface Modification in the Near-Electrode Region of an RF Discharge

Dynamic Entropy of Two-Dimensional Active Brownian Systems in Colloidal Plasmas

Square lattice formation in a monodisperse complex plasma

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