The underexposed effect of elastic electron collisions in dusty plasmas

Staps, T. J. A.; Ketterij, Marvin Igor van de; Platier, Bart; Beckers, JL Jozef

doi:10.1038/s42005-021-00734-w

Cited by 7 publications

(5 citation statements)

References 75 publications

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“…This is in line with observations from literature [56,63,90]. The increasing electron temperature can be seen as a compensation mechanism for the drop of the electron density, in order to sustain the plasma [94]. The combination of the sharp decrease of the electron density and the sharp rise of the electron temperature is characterized in literature as the α − γ ′ transition [95,96].…”

Section: Time-synchronized Diagnostics Applied To a Nanodusty Ar-hmds...supporting

confidence: 90%

Characterization of cyclic dust growth in a low-pressure, radio-frequency driven argon-hexamethyldisiloxane plasma

Donders

Staps

Beckers

2022

J. Phys. D: Appl. Phys.

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In a dusty plasma, nanometer-sized solid dust particles can be grown by the polymerization of plasma species from a reactive precursor gas. This type of plasma can be found in large-scale astrophysical objects, as well as in semiconductor manufacturing and material processing. In a laboratory environment, the plasma parameters can be carefully controlled and the dynamics of dust growth as well as the interaction between the plasma and the dust can be studied. In this work, we investigate the cyclic growth of dust particles in a low-pressure, radio-frequency driven argon-hexamethyldisiloxane (Ar-HMDSO) plasma using a multitude of diagnostics in a time-synchronized fashion. The combination of microwave cavity resonance spectroscopy (MCRS), plasma impedance measurements, laser light scattering, laser light extinction measurements and optical emission spectroscopy offers a broad view on the temporal behavior of the plasma in concert with the plasma-grown dust particles. We have studied the variation of several discharge parameters such as plasma power and HMDSO content. Therefore, this multi-diagnostic approach contributes to the fundamental understanding of the mechanisms behind dust growth in low-pressure plasmas.

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Section: Time-synchronized Diagnostics Applied To a Nanodusty Ar-hmds...supporting

confidence: 90%

Characterization of cyclic dust growth in a low-pressure, radio-frequency driven argon-hexamethyldisiloxane plasma

Donders

Staps

Beckers

2022

J. Phys. D: Appl. Phys.

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“…Dust particles immersed in plasmas are subject to a variety of forces, including electrostatic, gas and ion drag, thermophoresis, Brownian motion, and gravity [14][15][16][17][18][19][20][21][22]. The relative magnitude of each force depends on the size of the particle and the plasma conditions.…”

Section: Introductionmentioning

confidence: 99%

Particle trapping, size-filtering, and focusing in the nonthermal plasma synthesis of sub-10 nanometer particles

Xiong

Lanham

Husmann

et al. 2022

J. Phys. D: Appl. Phys.

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Low-pressure nonthermal flowing plasmas are widely used for the gas-phase synthesis of nanoparticles and quantum dots of materials that are difficult or impractical to synthesize using other techniques. To date, the impact of temporary electrostatic particle trapping in these plasmas has not been recognized, a process that may be leveraged to control particle properties. Here, we present experimental and computational evidence that, during their growth in the plasma, sub-10 nanometer silicon particles become temporarily confined in an electrostatic trap in radio-frequency excited plasmas until they grow to a size at which the increasing drag force imparted by the flowing gas entrains the particles, carrying them out of the trap. We demonstrate that this trapping enables the size filtering of the synthesized particles, leading to highly monodisperse particle sizes, as well as the electrostatic focusing of the particles onto the reactor centerline. Understanding of the mechanisms and utilization of such particle trapping will enable the design of plasma processes with improved size control and the ability to grow heterostructured nanoparticles.

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“…In fact, a large part of the research in the fields of complex and dusty plasmas in general, is focused around understanding the charging of the particles [7,[13][14][15][16]. The investigation of fundamental interactions between plasma environments and particles also often includes charge related forces such as electrostatic and ion drag forces, besides the well-known neutral drag force, and in some cases the thermophoretic force caused by a temperature gradient in the plasma [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Plasma Afterglow Induces Additional Neutral Drag Force on Microparticles

Huijstee

Blom²,

Peijnenburg³

et al. 2022

Front. Phys.

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An emerging topic in complex plasma physics is the interaction between dust particles and afterglow plasmas. Control of plasma-particle interactions and specifically of the particle trajectories is especially relevant for plasma based contamination control applications. In systems where this contamination control is relevant, emerging or applied plasmas can be of highly transient nature, due to which contaminating particles interact with a combination of a spatial and a temporal afterglow plasma. Until now this type of plasmas and the possible interaction with embedded microparticles has remained far from fully explored in literature. In this work we visually record falling microparticles in a spatio-temporal afterglow of a low pressure inductively coupled plasma and observe a sudden and temporary reversal in their vertical velocity. Numerical simulations confirm that this effect is due to the cooling of the heated background gas in the former active plasma region, which creates a pressure wave and causes microparticles in the spatial afterglow to experience an additional neutral drag force in direction of the plasma bulk. Besides being an interesting principle phenomenon, the presence of this effect could have added value for developing plasma-driven particle contamination control applications. Moreover, for a well defined vacuum vessel geometry and plasma heating volume, this enables the use of microparticles in the spatio-temporal afterglow as probe for the neutral gas temperature in plasma.

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The underexposed effect of elastic electron collisions in dusty plasmas

Cited by 7 publications

References 75 publications

Characterization of cyclic dust growth in a low-pressure, radio-frequency driven argon-hexamethyldisiloxane plasma

Characterization of cyclic dust growth in a low-pressure, radio-frequency driven argon-hexamethyldisiloxane plasma

Particle trapping, size-filtering, and focusing in the nonthermal plasma synthesis of sub-10 nanometer particles

Spatio-Temporal Plasma Afterglow Induces Additional Neutral Drag Force on Microparticles

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