Dusty plasmas

Фортов, В. Е.; Khrapak, Aleksei G.; Khrapak, S. A.; Molotkov, V. I.; Петров, О. Ф.

doi:10.1070/pu2004v047n05abeh001689

Cited by 626 publications

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“…Due to the large charge on the dust particles, complex plasmas often occur in a strongly coupled (liquid) state [24][25][26]. The effects of strong coupling were neglected in the original derivation of DAW [1], although the dispersion relation of the dust waves can clearly be seriously modified at strong coupling.…”

Section: Introductionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

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The conventional fluid description of multi-component plasma, supplemented by an appropriate equation of state for the macroparticle component, is used to evaluate the longitudinal sound velocity of Yukawa fluids. The obtained results are in very good agreement with those obtained earlier employing the quasi-localized charge approximation and molecular dynamics simulations in a rather broad parameter regime. Thus, a simple yet accurate tool to estimate the sound velocity across coupling regimes is proposed, which can be particularly helpful in estimating the dust-acoustic velocity in strongly coupled dusty (complex) plasmas. It is shown that, within the present approach, the sound velocity is completely determined by particle-particle correlations and the neutralizing medium (plasma), apart from providing screening of the Coulomb interaction, has no other effect on the sound propagation. The ratio of the actual sound velocity to its "ideal gas" (weak coupling) scale only weakly depends on the coupling strength in the fluid regime, but exhibits a pronounced decrease with the increase of the screening strength. The limitations of the present approach in applications to real complex plasmas are briefly discussed.

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Section: Introductionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

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“…Figure 3 shows the volume density of the electron and ion currents onto the dust surface j e and j i . These values are the time-averaged amounts of the charge carriers captured by dust in 1 cm 3 per 1 s obtained by the direct count of MCCs (as described in the previous section) and from the equations (9) and (10). In the first case, the events of absorption with cross section (4) were counted during the simulation of the test particles motion for 300 rf cycles.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of dust in the discharge is described by giving the probability of electrons and ions capturing during their motion through the cross section σ id (4), which depends on the local dust concentration n d (x), potential ϕ d (x) and the instant electron/ion kinetic energy. For small dust particles r d λ D the capture cross section σ id does not depend on the details of the ion motion near the dust particle [10]. According to equations (5) and (6), the most important thing is the shape of the IEDF (assumed to be Maxwellian in the OML approximation).…”

Section: Resultsmentioning

confidence: 99%

“…The volume densities of both currents j e and j i onto the dust surface (in other words, the charge carrier absorption rate per unit volume) at the position x and time t are given by the following basic equations (see, for example [10]):…”

Section: New Methods For Calculation Of the Dust Particle Chargementioning

confidence: 99%

“…In the traditional OML approach, using the cross sections (4) and assuming the Maxwellian velocity distribution for electrons and ions, equations (5) and (6) give the analytical expressions for the currents onto a single dust particle [10]:…”

Section: New Methods For Calculation Of the Dust Particle Chargementioning

confidence: 99%

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A non-Maxwellian kinetic approach for charging of dust particles in discharge plasmas

2008

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Effect of large-angle scattering, ion flow speed and ion-neutral collisions on dust transport under microgravity conditions V Land and W J Goedheer Abstract. Nanoparticle charging in a capacitively coupled radio frequency discharge in argon is studied using a particle in cell Monte Carlo collisions method. The plasma parameters and dust potential were calculated selfconsistently for different unmovable dust profiles. A new method for definition of the dust floating potential is proposed, based on the information about electron and ion energy distribution functions, obtained during the kinetic simulations. This approach provides an accurate balance of the electron and ion currents on the dust particle surface and allows us to precisely calculate the dust floating potential. A comparison of the obtained floating potentials with the results of the traditional orbital motion limit (OML) theory shows that in the presence of the ion resonant charge exchange collisions, even when the OML approximation is valid, its results are correct only in the region of a weak electric field, where the ion drift velocity is much smaller than the thermal one. With increasing ion drift velocity, the absolute value of the calculated dust potential becomes significantly smaller than the theory predicts. This is explained by a non-Maxwellian shape of the ion energy distribution function for the case of fast ion drift.

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Polymeric Colloidal Crystals

Okubo¹

2014

Encyclopedia of Polymer Science and Technology

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Recent advances in the study on the structural, dynamic and functional properties of polymeric colloidal crystals, mainly in the deionized aqueous suspension, are reviewed. Several important findings are paid attention: (a) Soft‐type colloidal crystallization takes place by the interparticle repulsion originated from the extended electrical double layers. The interaction is opposite to the importance of the interparticle attraction for crystallization of other general crystals, metals, proteins, and ice, for example. (b) Main lattice structures are face‐centered‐cubic ( fcc ) and body‐centered‐cubic ( bcc ) lattices. Packing efficiency, that is, minimizing the free volume is important. (c) Giant‐sized single crystals from the homogeneous and heterogeneous nucleation mechanisms form at the deionized and very diluted aqueous suspensions of monodisperse colloidal spheres. (d) Classical theory of crystallization holds for colloidal crystallization. (e) Viscosity, elasticity, and viscoelasticity of colloidal crystals are reviewed. (f) External field effects (gravitational, electrical, centrifugal forces, and so on) are discussed. (g) Colloidal crystal structure, morphology, and kinetics are quite similar to those of general crystals. (h) The application of colloidal crystals is also reviewed briefly.

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Dusty plasmas

Cited by 626 publications

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Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

A non-Maxwellian kinetic approach for charging of dust particles in discharge plasmas

Polymeric Colloidal Crystals

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