Active Brownian particle in homogeneous media of different viscosities: numerical simulations

Лисин, Е. А.; Ваулина, О. С.; Lisina, I. I.; Petrov, O. F.

doi:10.1039/d1cp02511b

Cited by 20 publications

(18 citation statements)

References 46 publications

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“…Also, we should note, that there are fundamental differences between the nature of active Brownian motion in rarefied media, such as plasma-forming gas in RF and DC discharges at low pressures, and motion in dense media, such as liquids. In particular, in rarefied gas media, including weakly ionized plasmas, both overdamped and underdamped motions are possible 57 .…”

Section: Resultsmentioning

confidence: 99%

Active Brownian motion of strongly coupled charged grains driven by laser radiation in plasma

Петров

Statsenko

Vasiliev

2022

Sci Rep

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The systems of active Brownian grains can be considered as open systems, in which there is an exchange of energy and matter with the environment. The collective phenomena of active Brownian grains can demonstrate analogies with ordinary phase transitions. We study the active Brownian motion of light-absorbing and strongly interacting grains far from equilibrium suspended in gas discharge under laser irradiation when the nature and intensity of the active motion depend on the effect of radiation. Active Brownian motion is caused by photophoresis, i.e., absorption of laser radiation at the metal-coated surface of the grain creates radiometric force, which in turn drives the grains. We experimentally observed the active Brownian motion of charged grains in the transition of the grain monolayer from the solid to liquid state. An analysis of the character of motion, including the mean-square and linear displacement and persistence length at various values of the randomization (coupling parameter) of the grain structure, was presented.

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Section: Resultsmentioning

confidence: 99%

Active Brownian motion of strongly coupled charged grains driven by laser radiation in plasma

Петров

Statsenko

Vasiliev

2022

Sci Rep

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“…Active Brownian motion can be classified as overdamped and underdamped, depending on the parameters of the medium, the particle and corresponding characteristic relaxation times) [ 3 , 30 ]. In the case of overdamped motion, which is studied in most experimental and theoretical works on active systems [ 2 ], inertia does not affect the motion of the particle.…”

Section: Introductionmentioning

confidence: 99%

“…We should also note that active systems in plasma consisting of colloids interacting via long-ranged electrostatic potential [ 32 , 33 , 34 ] represent a system that lacks both experimental implementation and theoretical description. Numerical simulations of such underdamped systems and theoretical predictions for their parameters are presented in [ 30 ].…”

Section: Introductionmentioning

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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“…This is due to the fact that the presence of a charge in the particles leads to the transfer of the electric energy of the gas discharge into the kinetic energy of the chaotic motion of particles in the plane of the monolayer. In this connection, the dusty plasma system can be considered as one of the options for the implementation of active matter [12][13][14][15][16][17]. In recent years, the interest in this form of matter on the part of scientists from various fields of science is growing rapidly [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Radiation on the Dynamics of Active Brownian Macroparticles in an Extended Plasma-Dust Monolayer

2021

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Using the modified method of Brownian dynamics, the dynamics of macroparticles with a uniform metal coating in a plasma-dust monolayer under the action of laser radiation was simulated. The time dependences of the root-mean-square and average linear displacements of particles were calculated for different initial effective parameters of nonideality and different intensities of laser radiation. A relationship was established that connects the effective parameter of nonideality of the dusty plasma system of active particles with the maximum value of the mean linear displacement of particles.

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Active Brownian particle in homogeneous media of different viscosities: numerical simulations

Abstract: Simple corrections are proposed to the basic theory of overdamped active Brownian motion, which allow one to calculate the effective diffusion coefficient and the persistence length of a self-propelled particle in a medium with any dynamic viscosity.

Cited by 20 publications

References 46 publications

Active Brownian motion of strongly coupled charged grains driven by laser radiation in plasma

Active Brownian motion of strongly coupled charged grains driven by laser radiation in plasma

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

Effect of Laser Radiation on the Dynamics of Active Brownian Macroparticles in an Extended Plasma-Dust Monolayer

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