Dust as probes: Determining confinement and interaction forces

Ashrafi, K. S.; Yousefi, Razieh; Chen, Mudi; Matthews, L. S.; Hyde, Truell

doi:10.1103/physreve.102.043210

Cited by 21 publications

(8 citation statements)

References 46 publications

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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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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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“…It enters into all dust-related quantities, e.g. electrostatic and ion drag forces [3,4], coupling parameter [5], velocities of the wave modes [6,7], absorption rates of plasma electrons and ions * Author to whom any correspondence should be addressed. [8,9], etc.…”

Section: Introductionmentioning

confidence: 99%

On the optical measurement of microparticle charge using quantum dots

Pustylnik¹,

Marvi²,

Beckers³

2021

J. Phys. D: Appl. Phys.

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We investigated the possibility of using a layer of quantum dots (QDs) deposited on the microparticle surface for the measurement of the charge the microparticle acquires when immersed into a plasma. To that end, we performed the calculations of the Stark shift of the photoluminescence spectrum of QDs caused by the fluctuating local electric field. In our calculations, we assumed the plasma-delivered surplus electrons to be distributed on the surface of a microparticle. According to our calculations, the Stark shift will acquire measurable values when the lifetime of the quasi-stationary configuration of the surplus electrons will be determined by their diffusion along the surface. Experiments with flat QD-covered floating plasma-facing surfaces suggest that measurable Stark shift of the photoluminescence spectrum can be achieved. Based on our model, modern microscopic plasma-surface interaction theories and analysis of the experiments, we suggest the possible design of the charge microsensor, which will allow to measure the charge accumulated on its surface by means of visible-light optics.

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“…To experimentally explore the sheath region of such low pressure plasmas, the aforementioned microparticles have been utilized as (almost) noninvasive probes in several studies. [25][26][27][28][29][30] From a basic point of view, a microparticle will-after being injected into and charged by the plasma-levitate at the exact position in the sheath region where the sum of all (plasma-induced) forces working on it is zero. With information about the microparticle charge, one could learn more about the relevant fundamental plasma-particle interactions and the different (plasma-induced) forces working on the microparticle.…”

Section: Introductionmentioning

confidence: 99%

Step-wise excitation for the determination of the resonance frequency of a microparticle confined in a low pressure plasma

2021

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Dust as probes: Determining confinement and interaction forces

Cited by 21 publications

References 46 publications

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

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

On the optical measurement of microparticle charge using quantum dots

Step-wise excitation for the determination of the resonance frequency of a microparticle confined in a low pressure plasma

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